SU1224602A1 - Apparatus for measuring velocity of ultrasound - Google Patents

Abstract

The invention relates to a measurement technique and can be PS-polished for measuring the speed of ultrasound. The aim of the invention is to improve the information content by measuring the speed at frequencies lying within the spectrum of the ultrasonic pulse. 11 pulses from the synchronizer start the generator of selection pulses and the generator of exciting pulses. From the output of the generator. Excitation pulses, the pulse arrives at the radiating transducer and through the sample under study. to a receiving transducer from which the electrical signal, after amplification in a broadband amplifier, is fed to the inputs of the first and second time selectors. The inputs of the time selectors from the generator output of the cycling pulses are given to signals that allow two consecutive reflected acoustic signals to pass through the time selectors. The resolution signals from the selection pulse generator are shifted relative to each other; friend} ia time equal to Double passage of the acoustic signal in the sample under study. From the output of the first and second selectors, the pulses arrive at the inputs of a narrow band: filters and then on the corresponding amplifiers with automatic gain control. Using the NsyraTopoB com, signals with the same frequency are fed to the recorder inputs. At the same time, the measurement of the speed at the frequencies lying inside the spectrum of the ultrasonic pulse, 1 sludge is provided.

Description

one

The invention relates to a measurement technique and can be used to measure the speed of ultrasound.

The purpose of the invention is to increase the information content by measuring the speed at frequencies lying within the spectrum of ultrasonic impulse.

The drawing shows a device for measuring the speed of ultrasound. .

A device for measuring the speed of ultrasound contains a nominally electroacoustically connected synchronizer 1, a generator of 2 exciting pulses, emitting 3 and receiving 4 converters, a wideband amplifier 5 and the first time selector 6, a generator of selective pulses 7, whose input is connected to the output of synchronizer 1, and the output is with the second input of the first time selector 6, a nerve pair of prices 8 and 9, each of which contains in series a narrowband filter 10 (P), the input of which is connected to the output the first time selector b, and the amplifier 12 (13) with automatic gain control and the recorder 14, the second time selector 5, the first input of which is connected to the output of the wideband amplifier 5, the second input to the second output of the selection pulse generator 7, the second pair 17 similarly JJ, e-pei, each of which contains a narrow-band filter 18 (19) connected in series, the KOTOpoi o input is connected to the output of the second time selector 15, and the amplifier 20 (21) with automatic gain control, two switches 22 and 23 in nodkgaocheny which rows to outputs of the corresponding bunks tributes 8 (9) 16 (17), and outputs - to the inputs of the recorder 14. .Predusmotrena installing radiating 3 and 4 of the receiving transducers on protivonololsnyh sides of the specimen 24. An apparatus for measuring the ultrasonic velocity is as follows,

Synchronizer 1 pulses 1 scatter generator 7 selection pulses and 2 exciting pulses. From the generator output

2 exciting pulses tshpuls comes to a radiating transducer

3.and through the test sample 24 on

ten

15

20

1224602.2

the receiver transducer 4, from which the electrical signal, which is a series of pulses corresponding to the successive reflections of the acoustic signal in the sample under study 24, after yci-scheni in the broadband amplifier 5 is fed to the inputs of the first 6 and second 15 time selectors. The inputs of the first 6 and second 5 time selectors from the generator output 7 of the selection impulses are given to permit the passage of the corresponding two successive reflections of the acoustic signal through the time selectors 6 and 15.

The resolving signals generated by the generator of the selective selection 7 are shifted relative to each other by a time equal to the time of the double passage of the acoustic signal in the sample under study 24.

From the outputs of the first 6 and second 15 time selectors, the impulses are sent to the inputs of the narrowband filters 0, 11 and 18.19 of the first and second pairs of chains 8.9 and 16, 17. From the outputs of the narrowband filters 10, 1Г and 18.19 signals arrive at the appropriate

30 amplifications - 12, 13 and 20, 21 with automatic gain control. From the outputs of amplifiers 12, 13 and 20, 21, signals are fed to switches 22 and 23, respectively. Using switches 22 and 23, signals with the same frequency are fed to the inputs of recorder 14, which can be: phase meter. Narrowband filter P.Y. 10 and 18, as well as filters 11 and 19 are tuned to the same frequency. The number of filters is chosen in such a way that they completely overlap the frequency band of the incoming signal.

40

45

ml of the decrease in the measurement error of the ultrasound velocity in materials with a large -1 attenuation, the amplification of amplifiers 12, 13 and 20, 21 is set so that the amplitude-voltage of the spectral components of the 50 signals at the output of the switches 22 and 23 is the same.

Invention

55 Device for measuring the speed of ultrasound, containing a sequentially electro-acoustically connected synchronizer, a generator is excited 45

ml of the decrease in the measurement error of the ultrasound velocity in materials with a large -1 attenuation, the amplification of amplifiers 12, 13 and 20, 21 is set so that the amplitude-voltage of the spectral components of the 50 signals at the output of the switches 22 and 23 is the same.

Invention

55 Device for measuring the speed of ultrasound, containing a sequentially electro-acoustically connected Synchronizer, excitation pulse generator, radiating transducer, receiving transducer, wideband amplifier and the first time selector, selection pulse generator, whose input is connected to the synchronizer output, and the first output is with the second input of the first time selector, the first pair of circuits, each of which contains a narrow-band filter connected in series, whose input is connected n with the output of the first time selector, and an amplifier with automatic gain control and recorder.

It is characterized there that, in order to increase the information content by measuring the speed at frequencies lying 1SH1X inside the spectrum of the ultrasonic pulse, it is equipped with a second time selector, the first input of which is connected to the output of the 1S {bandwidth amplifier, the second input - with the second output of the selection pulse generator, the second pair of similarly made circuits, two switches, the inputs of which are connected to the outputs of the corresponding pairs of circuits, and the outputs - to the inputs of the recorder.

Claims (1)

Claim A device for measuring the speed of ultrasound, which contains a series-connected electro-acoustic synchronizer, an exciting pulse generator, a radiating transducer, a receiving transducer, a broadband amplifier and a first time selector, a selection pulse generator, the input of which is connected to the synchronizer output, and the first output is with the second input of the first temporary selector, the first pair of circuits, each of which contains a series-connected narrow-band filter, the input of which is connected to the output of the first temporary selecto ipa, and an amplifier with automatic gain control and a recorder, characterized in that, in order to increase information content by measuring the speed at frequencies lying inside the spectrum of the ultrasonic pulse, it is equipped with a second temporary selector, the first input of which is connected to the output of the broadband amplifier, the second input - with the second output of the generator of selective pulses, the second pair of similarly made circuits, two switches, the inputs of which are connected to the outputs of the corresponding pairs of chains, and outputs to the inputs of the recorder.