SU1259110A1 - Ultrasonic device for checking product thickness - Google Patents

Abstract

This refers to the control of the Bio-measuring technique and can be used to control the thickness of moving articles. The purpose of the invention is to improve the accuracy of control over the account of changes in the temperature of electroacoustic transducers and of the controlled product during the measurement process. The device contains an electro-acoustic path. For two-way sensing of the product in a contactless manner using ultrasonic waves, a trigger for generating a signal with a duration equal to the delay in the electro-acoustic path, a temperature measuring unit, a voltage converter in a time interval for generating a correction signal that takes into account temperature change, summation blocks. and subtraction, designed to obtain the result of measuring the thickness of the product, taking into account possible fluctuations in temperature tours. 1 il ..

Description

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The invention relates to instrumentation technology and can be used to control the thickness of moving articles.

The purpose of the invention is to improve the accuracy of the control by taking into account changes in the temperature of the electroacoustic transducers and the controlled product during the measurement process.

The drawing shows a block diagram of an ultrasound device for controlling the thickness of products.

  The device contains synchronizer 1 connected in series, the first generator 2 probe pulses, the first electroacoustic transducer 3, the first gated amplifier 4, the second generator 5 probiruyirh pulses, the second electroacoustic transducer 6. and the second gated amplifier 7 and block 8, the subtraction, the first 9, the second 10 and the third 11 temperature sensors installed to measure the temperature of the first 3 and second 6, respectively, of the electroacus-transducers and the controlled product 12, connected in series to the first block 13 summation, the converter 14 is in parallel with the time interval and the second summation unit 15, the output of which is connected to the first input of the subtraction unit 8, the first 16, the second 17 and the third 18 operational amplifiers, whose inputs are connected to passages 9 and the respective sensors. 11, and the outputs to the inputs of the first summation unit 13, trigger 19, the first input of which is connected to the output of synchronizer 1, the second to the output of the second gated amplifier 7, and the output to the second input of the second summation unit 15, predetermined by 20 connected to the second input of the subtraction unit 8, and the indicator 21 connected to the output of the 8 output unit.

The device works as follows.

The synchronizer 1 periodically starts the first generator 2 of the probe pulses, which excites the first electroacoustic transducer 3. The latter emits ultrasound waves to the side of the monitored item 12, which are reflected from its surface and again at 1102.

They are amplified by the gated amplifier 4 and fed to the control input of the second generator 5 probe pulses, which excites the second electroacoustic transducer 6. The latter emits an ultrasonic wave that reflects from the surface of the monitored product is received by the second electroacoustic converter 6. Signals from its output are amplified by the second gating will amplify spruce 7,

According to the signals from the synchronizer output: 1 and the second gated amplifier 7, the trigger 19 generates a signal with duration, where, and i are the delays of the acoustic signals emitted by the first 3 and second 6 electroacoustic transducers, respectively, which is fed to one of the inputs of the second summation unit 15.

. Sensors 9-. 11 temperature is measured. The temperature of the first 3 and second 6 electroacoustic transducers and the monitored product 12, respectively. . At the output of the first summation unit 13, a signal is obtained which is converted by the voltage converter 14 to the time interval t, which is a correction to the interval ti - t; j, associated with a change in temperature in the elements of the device. At the output of the second block 15, the summation. Pickup-P1 is the value -i, fiij-bij .. In the set-. Chick 20 is entered into the delay value t in the electroacoustic path of the device in the absence of a controlled product. At the output of the subtraction unit 8, a value of 4a- (i;, tj) + i; xl is obtained, which characterizes the transit time of ultrasound in the controlled article, judging by the thickness of the article. The measurement result is recorded by the indicator 2 1.

The proposed device provides improved measurement accuracy.

31259

thickness of products in a contactless way by taking into account the errors associated with changes in tepatypy.

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Claims (1)

Formula of about o r An ultrasonic device for controlling the thickness of products, containing a synchronously connected synchronizer, the first probe pulse generator, the first electroacoustic transducer, the first gated amplifier, the second probe generator, the second electroacoustic transducer, and the second gating amplifier, as well as This is so because, in order to increase the control accuracy, it is equipped with the first, second and third temperature sensors installed with the possibility of measuring nor temperatzFy respectively, per- 1259 ten  five 20 PO4 first and second electroacoustic transducers and a controlled product, connected in series by the first summation unit, the voltage converter in the time interval and the second summation unit, the output of which is connected. to the first input of the subtraction unit, the first, second and third operational amplifiers, the inputs of which are connected to the outputs of the corresponding temperature sensors, and the outputs to the inputs of the first summation unit, with a trigger, the first input of which It is connected to the synchronizer output, the second input is to the output of the second strobe: a boosted amplifier, and the output is connected to the second input of the second summation unit, by means of a pointer connected to the second input of the subtractor, and an indicator connected to the output of the subtractor. Editor I. Shulla Compiled by G. Maximochkin Tehred I.Popovich. -Corrector M Maksimshinets Order 5112/39 Circulation 670. Subscription VN1ShPI State Committee of the USSR for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab, 4/5 Production and printing company, t. Uzhgorod, Projecto st., 4