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WO2024074349A1 - Système de capteur, système comprenant le système de capteur, et procédé de détection - Google Patents

Système de capteur, système comprenant le système de capteur, et procédé de détection Download PDF

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Publication number
WO2024074349A1
WO2024074349A1 PCT/EP2023/076542 EP2023076542W WO2024074349A1 WO 2024074349 A1 WO2024074349 A1 WO 2024074349A1 EP 2023076542 W EP2023076542 W EP 2023076542W WO 2024074349 A1 WO2024074349 A1 WO 2024074349A1
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WO
WIPO (PCT)
Prior art keywords
sensor system
acoustic signal
transducer
examined
signal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/EP2023/076542
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German (de)
English (en)
Inventor
Mikel Gorostiaga Altuna
Philipp Seebacher
Patrick SWASCHNIG
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TDK Electronics AG
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TDK Electronics AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by TDK Electronics AG filed Critical TDK Electronics AG
Publication of WO2024074349A1 publication Critical patent/WO2024074349A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/04—Analysing solids
    • G01N29/11—Analysing solids by measuring attenuation of acoustic waves
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
    • G01H1/00—Measuring characteristics of vibrations in solids by using direct conduction to the detector
    • G01H1/04—Measuring characteristics of vibrations in solids by using direct conduction to the detector of vibrations which are transverse to direction of propagation
    • G01H1/06—Frequency
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/04—Analysing solids
    • G01N29/12—Analysing solids by measuring frequency or resonance of acoustic waves
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/44—Processing the detected response signal, e.g. electronic circuits specially adapted therefor
    • G01N29/4409—Processing the detected response signal, e.g. electronic circuits specially adapted therefor by comparison
    • G01N29/4436—Processing the detected response signal, e.g. electronic circuits specially adapted therefor by comparison with a reference signal
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/44—Processing the detected response signal, e.g. electronic circuits specially adapted therefor
    • G01N29/46—Processing the detected response signal, e.g. electronic circuits specially adapted therefor by spectral analysis, e.g. Fourier analysis or wavelet analysis
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/44—Processing the detected response signal, e.g. electronic circuits specially adapted therefor
    • G01N29/48—Processing the detected response signal, e.g. electronic circuits specially adapted therefor by amplitude comparison
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/392—Determining battery ageing or deterioration, e.g. state of health
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
    • G01H11/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties
    • G01H11/06—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties by electric means
    • G01H11/08—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties by electric means using piezoelectric devices

Definitions

  • the invention relates to sensor systems, especially sensor systems for detecting characteristic properties of objects of interest. Furthermore, the invention relates to systems with such sensor systems and corresponding methods for detecting using the sensor systems.
  • characteristic properties can be, for example, the state of charge or the state of health or the functionality of a storage device, for example a storage device for electrical energy, for example a battery or an accumulator.
  • Storage devices for electrical energy such as rechargeable batteries, are needed and used in a wide variety of ways.
  • rechargeable batteries are used in electrically powered vehicles, smartphones, portable computers, robots, drones and the like.
  • Energy storage devices are sensitive to mechanical, electrical, thermal and other environmental influences. These influences can cause chemical and mechanical changes within the energy storage device and thus pose a danger whose existence is not easily recognizable from the outside.
  • Battery monitoring systems can, for example, check the externally provided voltage of the battery or an internal resistance of the battery or an alternating current impedance of the battery and are known from the following publications:
  • a monitoring system is known that is based on the propagation time behavior of acoustic signals.
  • An acoustic signal is coupled into a battery and the propagation time of the acoustic signals within the battery to a coupling element is examined.
  • DE 10 2017 205 561 A1 shows a battery system with a diagnostic function in which a receiver and, if necessary, an additional transmitter are arranged on a battery cell.
  • DE 10 2018 216 605 Al shows a galvanic cell with ultrasonic actuators which are designed to carry out an acoustic excitation of the galvanic cell and to record the acoustic response of the galvanic cell.
  • US 2022 / 0 206 075 Al shows a sensor system for analyzing an electrochemical system, for example a battery.
  • the sensor system comprises a first transducer and an evaluation circuit.
  • the first transducer is intended and suitable for converting a first electrical signal into an initial acoustic signal.
  • the sensor system is intended and suitable for coupling the initial acoustic signal from the first transducer to the surface of an object to be examined.
  • the evaluation circuit is intended and suitable for detecting a change in the acoustic signal.
  • the sensor system described therefore differs both in the central functional principle and in the specific elements that specifically apply the different functional principle.
  • An advantage, compared The advantage of evaluating runtimes is that the final acoustic signal can be analyzed directly and does not have to be related to the initial acoustic signal in order to calculate the time difference.
  • the initial acoustic signal can be transmitted from the first transducer to the object to be examined either via a coupling element or without contact. If the signal is transmitted using a coupling element, the coupling element can be applied to both the first transducer and the object to be examined. If the transmission is contactless, there is no direct or indirect physical contact between parts of the sensor system and the object to be examined. Contactless transmission can take place via electromagnetic waves. For example, only the first transducer can be attached to the object to be examined. The first transducer and the object to be examined can be separated from the other parts of the sensor system so that the first transducer and the object to be examined have no direct or indirect physical contact with the other parts of the sensor system.
  • the first transducer is intended and suitable to receive the acoustic signal again as a final acoustic signal and to convert it into a second electrical signal.
  • the sensor system also has a second
  • the second converter is intended to and suitable to receive the acoustic signal as a final acoustic signal and to convert it into the second electrical signal .
  • the final acoustic signal can be transmitted from the object to be examined to the second transducer either via a coupling element or without contact. If the signal is transmitted using a coupling element, the coupling element can be applied to both the second transducer and the object to be examined. If the transmission is contactless, there is either no direct or indirect physical contact between the sensor system and the object to be examined, or there is no direct or indirect physical contact between parts of the sensor system and the object to be examined. In the second case, for example, only the second transducer can be attached to the object to be examined. The second transducer and the object to be examined can be separated from the other parts of the sensor system so that the second transducer and the object to be examined have no direct or indirect physical contact with the other parts of the sensor system. Contactless transmission can take place via electromagnetic waves.
  • a coupling element can be implemented by an adhesive that attaches the corresponding transducer to the object to be examined.
  • a transducer can also be acoustically coupled to the object G to be examined via a screw connection or an analog connection.
  • Electroacoustic transducers that convert an electrical signal into a acoustic signal and which can also convert an acoustic signal into an electrical signal in the reverse order. Then the same electroacoustic transducer can serve both as an input transducer and as an output transducer.
  • an output transducer it can then be used to detect the changed signal which is reflected back to the transducer.
  • a second transducer is used in the sensor system in addition to the first transducer, these can be arranged relative to each other and relative to the object to be examined in such a way that the acoustic signal passes through critical areas within the object to be examined.
  • the acoustic signal can thus virtually scan the inner volume of the object to be examined.
  • the acoustic signal can also be guided essentially along the surface of the object to be examined and record surface-sensitive characteristic properties and transport them to the output transducer.
  • the current state of the object under investigation determines the form of the acoustic signal.
  • changes in the characteristic properties of the object under investigation can be detected by changes in the received signal, especially by changes in the spectrum of the final acoustic signal.
  • the evaluation circuit in the sensor system is designed and suitable for detecting a change in the frequency spectrum of the acoustic signal.
  • the evaluation circuit is intended and suitable for inferring a state from a dispersion curve.
  • the first and, if applicable, the second transducer can be piezoelectric transducers or EMAT transducers.
  • the first transducer can be a LASER vibrometer.
  • a LASER vibrometer is a device designed to detect an excited wave without direct physical contact.
  • a LASER beam can be used for this purpose.
  • the LASER vibrometer is designed to measure a vibration of an object using the LASER beam.
  • a piezoelectric transducer contains a piezoelectric material and electrode structures via which an alternating current signal can be applied to the piezoelectric material. Via the piezoelectric effect, the piezoelectric material reacts to the electrical signal by deforming accordingly, i.e. generating an acoustic signal that can be coupled to or into the object to be examined via the first coupling element. Due to the piezoelectric effect, the transducer can also convert the acoustic signal back into an electrical signal in an analog manner.
  • EMAT Electro Magnetic Acoustic Transducer
  • An EMAT transducer is based on the interaction of a current-carrying electrical conductor in a magnetic field. For example, if an electrical conductor structure is acoustically coupled to the object to be examined and a correspondingly aligned magnetic field exists at the location of the conductor structure, then a variable electric current flowing through the conductor structure generates, via the Lorentz force, mechanical stresses in or on the material of the object to be examined, whereby the mechanical stresses on the surface of the object to be examined or in the volume of the object to be examined are capable of propagating as an acoustic wave.
  • the EMAT transducer can in particular be designed to excite the acoustic wave without direct physical contact between a control device and the object to be examined.
  • the EMAT transducer itself must have physical contact with the object to be examined, otherwise it cannot excite the acoustic wave in the object.
  • the signal/energy input into the EMAT transducer from a control device can take place without physical contact between the control device and the EMAT transducer by signal/energy transmission through alternating fields excited by a magnet. The magnet therefore does not have to be in physical contact with the EMAT transducer and the object to be examined and can be separated by the gap.
  • a magnet designed to excite the acoustic wave in the object to be examined does not have to be in direct physical contact with the object to be examined, since the magnetic field can act over a short distance. Accordingly, a gap can be formed between a transducer designed as an EMAT transducer on or in the object to be examined and the magnet exciting the magnetic field.
  • an EMAT transducer is used as the first transducer, which is intended and suitable for converting a first electrical signal into an initial acoustic signal and into the object to be examined.
  • a second transducer designed as a LASER vibrometer which is intended and suitable to receive the acoustic signal as a final acoustic signal and to convert it into a second electrical signal.
  • This design of the sensor system can also be advantageous for subsequent inspections after production has been completed, since the sensor system does not have to be wired to the object to be examined in order to measure it and the object to be examined does not have to be physically opened, for example.
  • the sensor system may comprise a single EMAT transducer, which is the first transducer and which is further provided and suitable for receiving the acoustic signal again as a final acoustic signal and converting it into a second electrical signal.
  • the sensor system can be installed inside the object to be examined.
  • an inspection can be carried out particularly easily after completion of production.
  • the inspection can preferably be carried out without contact.
  • AS IC Application Specific Integrated Circuit
  • the evaluation circuit can in particular be intended and suitable for analyzing the frequency spectrum of the final acoustic signal.
  • the sensor system can be designed to consider a symmetrical oscillation mode and an antisymmetrical oscillation mode separately from one another when examining the frequency spectrum of the final acoustic signal.
  • the evaluation circuit is designed and suitable for determining the dispersion relation of the acoustic signal.
  • the dispersion relation indicates the frequency dependence of the phase velocity of an acoustic signal.
  • the initial acoustic signal can be a structure-borne sound signal.
  • the initial acoustic signal can be selected from a longitudinal wave, a transverse wave, a signal with a symmetrical oscillation mode, a signal with an antisymmetrical oscillation mode and a Lamb wave.
  • transverse waves can also propagate, in which the direction of propagation of the wave is different from the direction of vibration of the medium.
  • the direction of propagation of the wave can be orthogonal to the direction of vibration of the medium.
  • a symmetric vibration mode can be the vibration mode of a transverse wave in which the material of the medium at every longitudinal point along the direction of propagation of the wave at a certain time is in the same direction.
  • An antisymmetric mode of vibration can be the mode of vibration of a transverse wave in which the material of the medium at a particular longitudinal position along the direction of propagation of the wave vibrates opposite to other regions of the material at the same longitudinal position.
  • the initial acoustic signal has a characteristic frequency or a characteristic spectrum.
  • the initial acoustic signal has a characteristic frequency or a characteristic spectrum which reacts particularly sensitively to changes in the characteristic properties of the object to be examined.
  • the characteristic frequency or the characteristic spectrum can in particular have frequencies of around 10 kilohertz, 50 kilohertz, 100 kilohertz, 500 kilohertz or 1000 kilohertz.
  • the change in the acoustic signal is a change in the frequency spectrum.
  • the final acoustic signal has a different frequency spectrum than the initial acoustic signal.
  • the difference in the spectra provides information about the charge state, the state of health and/or the functionality of a battery, for example.
  • the sensor system can be designed to evaluate group velocities of a received acoustic signal. It is possible that the final acoustic signal shows a change compared to the initial acoustic signal and that the group velocity of the final acoustic signal in particular has a cutoff frequency, the frequency position of which depends on one or more characteristic properties of the object to be examined.
  • the cutoff frequency can be a frequency-dependent edge of the frequency-dependent group velocity of the acoustic signal. A change in the frequency position of this edge can then indicate a change in the characteristic property.
  • an increased charge level of a rechargeable battery is accompanied by a reduction in the frequency edge.
  • the charge level of the battery can thus be easily determined without the need for runtime measurements, which always require the determination of a time difference and thus the establishment of a first time and a second time.
  • the coupling element of the sensor system is intended and suitable for coupling the first converter to a storage device for electrical energy.
  • the sensor system can be used to scan characteristics of batteries, especially rechargeable batteries.
  • the characteristic properties are selected from state of charge (SoC), state of health (SoH), and state of functionality (SoF).
  • the sensor system is not only suitable for scanning one of the characteristic properties.
  • the sensor system can scan both the charge state and the health state, or both the health state and the functionality, or both the charge state and the functionality. It is also possible that the sensor system scans both the charge state and the health state and the functionality.
  • the sensor system is designed and suitable to operate in the frequency domain.
  • a corresponding system comprises a storage device for electrical energy and a sensor system as described above.
  • a system may include another object to be examined together with a sensor system as described above.
  • the battery may be a traction battery of an electric vehicle, a smartphone, a portable computer, a robot, a drone or a similar object.
  • a corresponding method for detecting a characteristic property of an object to be examined by means of a sensor system as described above can comprise the following steps:
  • the change is a change in the frequency spectrum.
  • the method may further comprise:
  • the method may further comprise:
  • the method can be used to determine one or more characteristic properties, for example state of charge, state of health and/or functionality of the object to be examined.
  • the method comprises determining the dispersion relation of the final acoustic signal. From the dispersion relation, characteristic properties can then be determined, or from the change in the dispersion relation, a change in the corresponding characteristic properties can be determined.
  • Evaluating propagation curves (e.g. dispersion relations) of waves (e.g. Lamb waves) or evaluating group velocities shows the speed at which the waves propagate depending on the mode and the frequency.
  • the same Lamb mode e.g. SO
  • the unit MHZ*mm is advantageous because, for example, simulations can be normalized with respect to thickness for isotropic simulations.
  • a suitable unit would be MHz.
  • the TOF (time-of-flight) between two transducers would be the same for this mode and for all frequencies in this range, which shows the advantage over TOF systems.
  • Figure 3 shows an embodiment with two transducers arranged on opposite sides of an object G to be examined
  • Figure 4 Changes in the acoustic signal that indicate characteristic properties of the object to be examined
  • Figure 5 an example of an initial acoustic signal
  • Figure 8 shows the dependence of the width of a frequency spectrum on the state of charge of a battery.
  • FIG. 9 shows another embodiment of the sensor system SENS.
  • Figure 1 shows a sensor system SENS which comprises an evaluation circuit AS and a converter W1.
  • the converter W1 is the first converter of the sensor system SENS and is electrically coupled to the evaluation circuit AS.
  • the first converter W1 is acoustically coupled to an object G to be examined via a coupling element KE.
  • An examination of characteristic properties of the object to be examined can only be carried out if the first converter converts a first electrical signal into an initial acoustic signal.
  • the initial acoustic signal is coupled into the material of the object G to be examined via the coupling element KE. While the acoustic signal passes through the material of the object to be examined and is reflected if necessary, the object to be examined changes the acoustic signal to a characteristic manner.
  • the transducer W1 converts the final acoustic signal into an electrical signal, which is passed on to the evaluation circuit AS.
  • the evaluation circuit examines the final acoustic signal received and uses the change in the acoustic signal that has occurred in the meantime to deduce one or more characteristic properties of the object G to be examined.
  • the result is independent of signal errors that are due to problems in determining the propagation time.
  • the investigation of a transit time allows the determination of only a single parameter, whereas the investigation of the frequency spectrum allows the determination of more information about the object under investigation.
  • the analysis of the signal to be received can be carried out differently than with "pulse-echo" methods (where the analysis is based on reflections).
  • the analysis of the signals can be carried out on transmission, i.e. on transmitted signals.
  • the frequencies used are lower than with reflection-based methods and are in the kHz range (e.g. at frequencies between 1 kHz and 900 kHz).
  • Figure 2 shows the possibility of a sensor system in which the sensor system SENS comprises a first transducer W1 and a second transducer W2.
  • the first transducer W1 is acoustically connected to the object to be examined via a coupling element KE.
  • Object G is coupled.
  • the second transducer W2 is also acoustically coupled to the object G under investigation via a coupling element KE.
  • An acoustic signal passes through the object G under investigation at least from the position of the first transducer W1 to the position of the second transducer W2. Changes in the signal allow conclusions to be drawn about characteristic properties of the object G under investigation.
  • Figure 3 shows the possibility of attaching the first transducer and the second transducer to different surfaces of the object G to be examined, specifically to opposite surfaces of the object G to be examined. While attaching both transducers to the same side of the object to be examined enables the use of acoustic surface waves which propagate on the upper side of the object G to be examined in a simple manner, the version of Figure 3 specifically allows an examination of the internal structure of the object G to be examined.
  • storage devices for electrical energy such as batteries can have a layered structure.
  • Batteries can have layers made of different metals, for example aluminum, copper and the like, and layers made of materials that are impermeable to electrodes and/or ions.
  • batteries can have mechanically stable structures, for example housing walls and the like. Different states of the batteries cause differences in the propagation of the acoustic wave, so that a change in the acoustic signal can be used to infer corresponding characteristic properties.
  • Figure 4 shows on the left an initial acoustic signal IAS which is passed on to the object G to be examined via the first transducer W1.
  • the acoustic signal As the acoustic signal propagates inside the material of the object G to be examined or on its upper side, the acoustic signal changes in a characteristic way.
  • the changed acoustic signal is received at the second transducer W2 as the final acoustic signal FAS.
  • the change in the acoustic signal is detected and evaluated so that appropriate conclusions can be drawn about the properties of the object G to be examined.
  • Figure 5 shows on the left side an initial acoustic signal which is acoustically coupled into the object G to be examined, for example as a wave packet.
  • the initial acoustic signal has a characteristic initial frequency distribution, which is shown on the right side of Figure 5.
  • Figure 6 shows a received, final acoustic signal.
  • the received, final acoustic signal can contain a signal component with a symmetrical oscillation mode and a signal component with an antisymmetrical oscillation mode.
  • the signal component with the symmetrical oscillation mode is received first.
  • the signal component with the antisymmetrical oscillation mode is received. Examining the frequency spectrum of the final acoustic signal thus allows a symmetrical oscillation mode and an antisymmetrical oscillation mode to be separated from one another. so that even more detailed information about the object under investigation can be obtained.
  • Figure 7 shows the frequency dependence of the edge of the normalized group velocity GG.
  • the solid edge on the left represents the edge of a spectrum at a charge level of 20%.
  • the solid edge on the right represents a charge level of 80%.
  • the distinction between 40% and 60% is clearly visible.
  • the dashed lines show the frequency curve of an empty battery (0%) and a full battery (100%).
  • the solid lines show measured values, while the dashed lines represent calculations. It is clearly visible that the calculations agree well with the actually determined values.
  • Figure 8 illustrates that determining a normalized group velocity as shown in Figure 7 is not necessary to obtain information about the charge state of a battery. Instead, Figure 8 directly shows the width of the spectrum of the final acoustic signal received. In Figure 8, the amplitude is plotted against the frequency. The three curves each show the frequency response for an empty battery (0%), a half-charged battery (50%) and a full battery (100%).
  • the sensor system described is not susceptible to disturbances that affect previously known sensor systems. However, the sensor system described allows the investigation of characteristic properties using different vibration modes, for example different Lamb modes and even examining using interference signals that would disturb conventional examinations.
  • the determined, final acoustic signal can be divided into different frequency ranges and vibration modes in order to obtain further information about the object to be examined.
  • the sensor system is not limited to the described forms and elements shown in the figure.
  • Sensor systems can include further elements, for example further converters, further evaluation circuits, separate power supplies and signal filters, for example high-pass filters, low-pass filters or band-pass filters.
  • FIG 9 shows a further exemplary embodiment of a sensor system SENS.
  • the sensor system SENS has an evaluation circuit AS, a first transducer W1 and a second transducer W2.
  • the first transducer W1 is designed to transmit an initial acoustic signal without contact to an object G to be examined.
  • the first transducer W1 can be an EMAT transducer which is designed to stimulate the initial acoustic signal in the object G to be examined.
  • the first transducer and the object G to be examined can be physically separated from the other parts of the sensor system SENS.
  • a signal or energy is transmitted to the first transducer designed as an EMAT transducer without contact by means of a magnetic field.
  • a magnet which generates the magnetic field does not touch the first transducer W1 or the object G to be examined.
  • the second transducer W2 is designed to receive or read a final acoustic signal without contact from the object G to be examined.
  • the second transducer W2 can be a LASER vibrometer.
  • the second transducer W2 can be designed to direct a LASER beam onto the object G to be examined and to detect a vibration of the object to be examined based on the reflection of the LASER beam.
  • SM, AM symmetrical vibration mode, antisymmetrical vibration mode
  • T time Wl, W2 : first, second converter

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  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)

Abstract

L'invention concerne un système de capteur pour déterminer des propriétés caractéristiques d'un objet à examiner. Le système de capteur comprend un premier transducteur et un circuit d'évaluation. Le premier transducteur est prévu et approprié pour convertir un premier signal électrique en un signal acoustique initial. Le système de capteur est prévu et approprié pour appliquer le signal acoustique initial du premier transducteur à la surface de l'objet à examiner. Le circuit d'évaluation est prévu et approprié pour détecter un changement dans le signal acoustique. A cet effet, le système de capteur utilise des changements de fréquences ("domaine fréquentiel").
PCT/EP2023/076542 2022-10-05 2023-09-26 Système de capteur, système comprenant le système de capteur, et procédé de détection Ceased WO2024074349A1 (fr)

Applications Claiming Priority (2)

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DE102022125667.7 2022-10-05
DE102022125667 2022-10-05

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Citations (13)

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