SU1129489A1 - Ultrasonic method of article thickness checking (its versions) - Google Patents

Abstract

1. Ultrasonic method of controlling the thickness of the product, consisting of SUn .. 1129489 Г Э

Description

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2. Ultrasonic method of controlling the thickness of the product, consisting in two-sided echolocation of the product by ultrasonic pulses, in the echolocation of the reflector in the reference acoustic channel and in measuring the time of propagation of echo signals, and in order to increase the accuracy of measurements, simultaneous echo sound is being performed. the main and additional reflectors of the reference acoustic channel, followed by successive echolocation of the two sides of the product, register the echo signal and measure the time intervals between at first: and second, and fourth vtorm echoes on to torym determined thickness on

3, Ultrasonic method of controlling the thickness of the product, consisting in two-sided echolocation of the product by ultrasonic pulses, in the echolocation of the reflector in the reference acoustic channel and in measuring the propagation time of echoes, so that, in order to improve the accuracy of measurements, they are simultaneously the echolocation of the main and additional reflectors of the reference acoustic channel with the subsequent successive passive echolocation of the additional reflector and the echolocation of the two sides of the product, is recorded four echoes and measure the time intervals between the first and second, third and fifth echo 1and, which determine the thickness of the product.

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The invention relates to a measurement technique and can be used to control the linear dimensions of industrial products.

An ultrasonic method for controlling the thickness of a product is known, consisting in two-sided echolocation of the product, ultrasonic pulses, in the echolocation of the reflector in the reference acoustic channel and in measuring the propagation time of echoes | 1.

The disadvantage of this method is low measurement accuracy.

The purpose of the invention is to improve the measurement accuracy.

The goal according to the first variant is achieved by the fact that, by the ultrasonic method of control of TOL1CIN,

concluding in a two-way echolocation of the product with ultrasonic pulses, in the echolocation of the reflector in the reference acoustic channel and in measuring the time of propagation of echoes, four echoes of the reference acoustic channel and one of the sides are followed by simultaneous echolocation and measure the time interval between the third and fourth

echo signals, which determine the thickness of the product.

The goal according to the second variant is achieved by the fact that according to

Ultrasonic method of controlling the thickness of the product, consisting in two-way echolocation of the product by ultrasonic pulses, in the echolocation of the reflector in the reference acoustic channel and in the measurement of the propagation time of echoes, simultaneous four echoes and measure the time intervals between the first and second, second and fourth echoes, for which m determine the thickness of the product.

The goal according to the third variant is achieved by the fact that by the ultrasonic method of controlling the thickness

the product, consisting in a two-way echolocation of the product by ultrasonic pulses, in echolocation from 4. a datum in the reference acoustic channel and. In the measurement of the propagation time of the echo sig.alo.v, simultaneous echolocation of the main and additional reflectors of the acoustic reference channel is carried out, followed by a subsequent passive echolocation of the additional reflector and the eccholocation of the two sides of the product, four echoes of the first and the second, third and fifth echoes, which determine the thickness of the product. Fig, t shows a block diagram J of a device that implements an ultrasonic method for controlling the thickness of the product according to the first embodiment; FIG. 2 are timing charts of signals at various points in a block diagram; Fig, 3 is a block diagram of a device that implements an ultrasonic. Method for controlling the thickness of the product according to the second embodiment; FIG. 4 shows timing diagrams of signals at various points of the block circuit; FIG. 5 shows a block diagram of a device that implements an ultrasonic method for controlling the thickness of the product according to the third variant in FIG. 6; time diagrams of signals at various points of the block diagram. A device that implements an ultrasonic method for controlling the thickness of the product in the reference acoustic channel contains an acoustic transducer 1, a main reflector 2 located from the acoustic transducer 1 at an IQ distance, and an additional reflector 3 located from an acoustic transducer 1 at a distance of 1 acoustic channel — acoustic transducers 4 and 5, between which the product 6 is placed, which is placed at a distance f from the acoustic transducer 4 and at a distance of 2 ° of the acoustic transducer 5, in the electronic unit - the generator 7, the trigger 8, the amplifier shaper 9, the multivibrator 10, the pulse counter 11 and the electronic keys 12-19 (FIG. 1) in the first embodiment), 20-32 (FIG. 3-. In the second variant) and 33-50 (fig. 5 in the third variant), a device that implements an ultrasonic method for controlling the thickness of the product in the first variant, works as follows,. The generator 7 excites acoustic transducers 1 and 4, which will send a probe pulse 51 (Fig. 2) in the direction of the main 2 and an additional 3 reflectors of the acoustic channel, producing them, thereby simultaneously echolocating them. At the time the echo sig nal 53 is received by the acoustic transducer 3 echolocation of the second side of the product is made. The result of the echolocation of the reference channel (probe pulse 51, echo signals 52 and 59) and the product (probe pulses 51 and 56, echo signals 53 and 5Z) four pulses 54, 55, 58 and 60 formed by amplifier 9, the recording time of which corresponds to the distances 1 ,, - ,, a, 1) and i.in the electronic unit of the device, the selection of information about the monitored size L t - (t 4 is done by filling the interval of time between the third 58 and fourth 60 echoes with counting pulses 62 of the multivibrator 10, the output of which is connected to counter 11, frequency followed and the counting pulses 62 at the beginning of each measurement cycle are controlled by the pulse 61 formed by trigger B, which is proportional to the speed of sound in the medium of probe pulses 51 and 56, the device that implements the ultrasonic method for controlling the thickness of the product according to the second variant, operates as follows The transducer 1, which sends a probe pulse 63 in the direction of the reflectors 2 and 3, simultaneously echolocates them. At the time of arrival of the echo signal 65 These transducers 4 and 5 produce a series of echolocations of the two sides of item 6, the result of the echolocation operations of the reference acoustic channel (sounding pulse 63, echoes 64 and 65) and the item being monitored (sounding pulses 68 and 71, echoes 69 and 72) are formed amplifier 9, four pulses 66, 67, 70 and 73, the time intervals between which correspond to the distances i, and ij. In the electronic unit, the selection of information about the controlled size Ij .. / 2 tons, e, spacing in the time between the first 66 and vtorym67, the second 67 and fourth 73 echoes. For this, these time intervals are filled with counting pulses 75 and 76

multivibrator 10 and read the reversing counter 11..

The frequency of the counting pulses 75 and 76 at the beginning of each measurement cycle is controlled by the pulse 74 formed by the trigger 8, which is proportional to the propagation of the probing pulses 63 68 and 71, the duration of which is proportional to the speed of sound in the medium.

A device that implements the ultrasonic testing of the product on the third option, works as follows.

The generator 7 excites the acoustic transducer 1, which sends a probe pulse 77 simultaneously in the direction of the reflectors 2 and 3, producing their echolocation. After a time (tjj + tg) required for the probe pulse to reach the main transmitter 2 and vice versa, the echo signal 79 is reflected by the working plane of the transducer 1 in the direction of the reflector 3. Thus, t: transducer 3 is passively echoed by the acoustic transducer 80 4 and 5, the two parts of the monitored item 6j are sequentially echoed as a result of the echolocation operations of the reference acoustic channel (sounding impulse 77, echoes 78, 79 and 80) and controlled the products (probing pulses 84 and 87, echoes 85. and 88) are 9 pulses formed by the amplifier 8, 82, 83, 86 and 89, time intervals and between which correspond to the distances f, fp, f and f 2

In the electronic unit of the device, information about the controlled size i s z z is obtained by comparing the distances ig and (fy + 1,) ,. those. the time intervals between the first 78 and second 79, third 80 and fifth 88 echoes, for which these time intervals are filled with counting pulses 92 to 93 of the multivibrator 10 and the reading from the reversible counter 11.

The frequency of the counting pulses 92 and 93 at the beginning of each measurement cycle (for pulses 92) and. before the echolocation of the article being monitored (for pulses 93), is controlled by pulses 90 and 91 generated by trigger 8 and proportional to the speed of sound in the medium of probe pulses 77, 84 and 87.

The proposed method provides an increase in the accuracy of controlling the thickness of the products.

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Claims (3)

1. Ultrasonic method for controlling the thickness of the product, which consists in bilateral echolocation of the product by ultrasonic pulses, in echolocation of the reflector in the reference acoustic channel and in measuring the propagation time of the echo signals, characterized in that, in order to increase the accuracy of measurements, simultaneous echolocation of the main and additional reflectors of the refractory acoustic channel and one of the sides of the product with subsequent echolocation of the second side of the product, register four echo signals and measure the time interval waiting for the third and fourth echo signals, which determine the thickness of the product. 2. The ultrasonic method for controlling the thickness of the product, consisting in bilateral echolocation of the product by ultrasonic pulses, in echolocation of the reflector in the reference acoustic channel and in measuring the propagation time of the echo signals, characterized in that, in order to increase the accuracy of measurements, simultaneous echolocation of the main and additional reflectors of the reference acoustic channel with subsequent successive echolocation of two sides of the product, register four echo signals and measure the time intervals _; the exchange between the first and second, second and fourth echo signals, which determine the thickness of the 3. The ultrasonic method for controlling the thickness of the product, which consists in bilateral echolocation of the product by ultrasonic pulses, in echolocation of the reflector in the reference acoustic channel and in measuring the propagation time of the echo signals, distinguished by the fact that, in order to increase the accuracy of measurements, simultaneous echolocation of the main and additional reflectors of the reference acoustic channel with subsequent sequential passive echolocation of the additional reflector and echolocation of two sides of the product, register four and measuring the echo time intervals between the first and second, third and fifth ehosignalg <and, LIA which determine the thickness of the product.