SU1515403A1 - Differential converter of linear displacement into code - Google Patents

Abstract

The invention relates to a technique for measuring and controlling linear displacements, namely, magnetostrictive linear displacement transducers with a ratiometric transformation, and allows to increase the response speed of a linear displacement measurement. This is achieved by using a conversion method in which the selected linear motion interval is filled with chirp pulses (chirp - linear frequency modulation), synchronous measurement of the instantaneous frequencies at its extreme points is made, and their difference is calculated. The converter contains a magnetostrictive linear displacement sensor 1, consisting of a stringed magnetostrictive channel 2 of transmission, two acoustic absorbers 3 and 4, a stabilizer 5 of tension, a recording element 6 of electromagnetic excitation, two fixed elements 9 and 10 of reading, a voltage-current converter 11 , two amplifiers 12 and 13 of reading, and a digital conversion channel, consisting of a oscillating frequency generator 15, two analog-digital read drivers 16 and 17, a synchronization circuit 18, a digital converter 19 ovatel ratio frequency code and the trigger control 20. The converter is intended for use in high-speed robotic systems for controlling linear movements of objects with asynchronous control. 2 Il.

Description

The invention relates to an electromechanical conversion of measurement results, namely, to differential transducers of linear displacements into a code.

The purpose of the invention is to increase the speed of movement measurement.

FIG. 1 shows a functional diagram of a differential linear transducer to code; in fig. 2 - time diagram of his work.

The differential transducer of linear displacements into a code contains a magnetostrictive transducer 1 of linear displacements consisting of a string magnet of a grip channel 2 of the transmission (magnet). acoustic absorbers 3 and 4, passive stabilizer 5 tensile forces, movable element 6 of electromagnetic excitation recording with magnetic slider 7 of magnetic fluid and biasing elements 8, two motionless differential elements 9 and 10 of reading, voltage converter 11 - current and two reading amplifiers 12 and 13, and a digital conversion channel 14, consisting of a oscillating frequency generator 15, two analog-to-digital reading drivers 16 and 17, a synchronization digital converter 19 stot in code and trigger 20. The steam inlet and control bus 21, a first output bus 22 request, a second input 23 iinu acknowledgment, a second output bit line 24 and a third re result output bus 25, synchronization.

The device works as follows.

Initially, the device is reset. Using a digital signal of resolution (fig. 2a), the incoming through the first input control bus 21 to the control input of the oscillating frequency generator 15 is transferred to the operation mode. The oscillating frequency generator 15 is started up. At its outputs, reference frequency sync signals (Fig. 2g) are generated, which pass to the input of synchronization circuit 18, chirped interrogation signals (chirp - linear frequency modulation) frequencies, which pass to the input of converter 11 for example

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vin is the current installed in the case of the magnetostrictive sensor 1 of linear displacements made differential (Fig. 1).

Interrogation signals energize (trigger) voltage converter 11 - a current and correspondingly current write pulses that pass through the active medium of a low-inductance recording element 6 with a magnetic slider 7 from a magnetic fluid and a constant biasing element 8 set coaxially are generated at its output. - but with a stringed magkitostrictive, channel 2 transmission (magnetic conductor). As a result, frequency ultrasonic pulses of mechanical deformation due to direct magnetostrick1; 1; joining (Joule effect) propagating in both directions with magnetotolt re-magnetization speed are excited under the recording element 6 in the contact zone of the magnetic slider 7 and the magnetic guide.

At the following times, the frequency ultrasonic probe pulses pass through the magnetic conductor under the fixedly mounted reading elements 9 and 10, which, for example, can be performed using the inductances of the magic of the sensitive-sensitive stress-sensitive elements, and the corresponding frequency pulses of the reading voltage due to the reverse m. chignostriction transformation (stjKjjeKT Villari). Next, the probing ultrasound pulses detect the total acoustic absorption of acoustic absorbers 3 and 4, excluding the formation in the magnetostatic magnetostrictive sensor 1 of linear movements of the device of reflection waves.

The induced frequency read pulses from the outputs of the first and second differential elements 9 and 10 read, respectively, to the inputs of the first and second read amplifiers 12 and 13 and form on their inputs, digital chirp read pulses (Fig. 2a-e), which arrive at the input of analog-digital shapers 16 and 17 reading, digital channel 14 conversion device.

On the first output bus 22 of the device request, a digital signal is sent to the Request (FIG. 2b), in response to which, through the response time, the consumer is

Information bodies, for example, mini- or micro-computers, receive a digital pulse signal on the second confirmation bus 23, a confirmation signal (Fig. 2c) is set. This signal is used to switch the control trigger 20 to a single state, which causes the signal to be removed. Request the first output bus 22 of the device request, and unlock the inputs of the analog-digital drivers 16 and 17 of the reading and synchronization circuit 19.

The analog-digital read drivers 16 and 17, respectively, to the first and second information inputs of the digital converter 19, the ratio of the frequencies, the code passes the read pulses, and on. The sync pulse is generated at the output of the synchronization circuit 18, which is used to start synchronizing the digital frequency converter 19 into the code, which measures the instantaneous frequencies and then calculates the digital linear shift code that passes to the second output discharge digit 24 of the result.

At the end of the conversion cycle, a digital synchronization signal (Fig. 2h) is generated on the 1xhp-down of the ratio-to-code converter 19 of the frequency converter, which passes to the device's third synchronization output bus 25. The same sync signal is used to switch to the initial (zero) state of control trigger 20, which leads to blocking the inputs of secondary amplifiers-formers 16 and 17 and the synchronization circuit 18 and setting the request on the first output bus 22 of the device request.

This completes the device conversion cycle and is prepared for the next conversion cycle, which begins with the arrival of the digital pulse signal and is executed without modification.

Thus, at the time of reaction of the information consumer t p - O, the use of this approach of processing the measurement information of the displacement makes the converter a fast-acting device, in which

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It sorts only from the time Trp of the frequency-to-frequency conversion and does not depend on the time T of translation of the probing magnetoelastic wave through the conductor, i.e., has (1, T, / Tr) times higher speed than the prototype. In this case, the time of measurement of linear displacements T перемещ T stabilizes, which contributes to the expansion of the area of technical application of the device.

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Claims (1)

Invention Formula Differential linear displacement transducer into a code containing a magnetostrictive transmission channel, made with two acoustic absorbers at the ends and interfaced through a moving magnetizing element, mounted coaxially with a magnetostrictive transmission channel, with the output of a voltage converter — current and coupling the same with the first and second differential elements of the links connected by the outputs, respectively, through the first and second reading amplifiers to the outputs of the first and second analog-digital forms readable data, the interrogator, connected to the output of the voltage converter - current and the second output - to the first input of the synchronizer circuit, characterized in that, in order to improve the speed measurement of movement, a digital frequency ratio converter is entered into the code and a trigger, and the polling generator is designed as a oscillating frequency generator, with the outputs of the first and second analog-digital reading drivers being connected to the first and second inputs of the digital frequency ratio to code converter, under connected by a third input to the output of a synchronization circuit connected by a second input to interconnected control inputs of the first and second analog to digital read converters and trigger output connected by the input to the clock output of the digital converter of the frequency ratio to the code whose outputs are the outputs of the converter and the second trigger input is the measurement time T перемещ of the movement by the control input of the transducer. (2) d 12 to 13 W15 {1 3 25 I I I I I I I I GM I I I I I I I I I I I I I I I I I M I I I I II} Jt P P Jl / V ,, / XP, Nji P Jl 2