SU526818A1 - Device for automatic recording of ultrasound velocity changes - Google Patents

Description

one

This invention relates to ultrasound methods for the investigation of substances and can be used in automatic recorders of ultrasound velocity in various media.

In the MbGahertz frequency range to record the dependence of the speed of ultrasound, pulse meters 2, 3 are widely used.

Closest to the invention is a device for automatically recording changes in ultrasound velocity, containing a high frequency generator, controlling: the input input of which is connected to the synchro generator, and the output — an iK measuring chamber with a sample and electromechanical transducers; two channels for generating start and reset pulses The transducer is a time-amplitude, the output of which is connected to the recording device 1 through a peak voltmeter. Under certain conditions, it has a high accuracy of measurement. The operation of the device is based on the method of continuous measurement of the time interval between the selected half-periods of the two echoes of the wave pattern by converting the time interval to the amplitude of the linear saw-tooth voltage, detecting with a peak voltmeter and recording a constant voltage proportional to the measured interval using a recording device.

The known device has the following disadvantages.

The response times of the drivers in each channel depend on the amplitudes of

signals. In order to reliably highlight the intended half-period in the channels, it is necessary to include an automatic gain control circuit (AGC), the depth of which is determined by the attenuation range of ultrasound in the medium. If the attenuation is changed more than is allowed by the AGC scheme, then the desired half-period will not be allocated, which leads to an error in the measurement.

It is impossible to automatically record changes in the ultrasound velocity in the sample during plastic deformation, since this changes the shape and steepness of the fronts of the echo pulses. The aim of the invention is to eliminate

these shortcomings.

The purpose of the invention is achieved by the fact that the channel for forming start-up pulses is made in the form of serially connected delay blocks, the input of which is connected to the output

Claims (3)

a high-frequency generator, a gated amplifier, a phase phase synchronizer relaxator, a start-up pulse generator and a short-wave Kii-forti-Kii, a pulse-shaping channel in the form of a series-connected building amplifier, whose input is connected to jioiViepwi vioiiUu ivaiViupoii, a divider laii Viiepoi, whose input is connected to jioiViepwi vioiiUu ivaiViupoii, a divider laii Viiepoi, whose input is connected to jioiViepwi vioiiUu ivaiViupoii; ji; aiqiu yochei rehepaiup shir jail eipoo - m11} losB, whose input is connected to synchronous mode jiiopOiOBbUi Ð laxlator-syHh.roiiz10p phase of the target Bbiiio.mwib i3 view and share on the frequency delimiter. Fig. 1 isoR o-wi-circuit device scheme; ha ha. Ziur Voltage, but c: null of the system. jCipOHCiBO. contains a high-frequency generator I, unraVr 1O1Dia input which is connected to power generator 2, and the output - to the measuring chamber with an oraztsom and electrical equipment, it is used, you can get it, you can get it, and the output will connect to and Soros i peoopazazovale i "time -amnlnudt 4, vv ho d which through Nikov volvtmstra about connected to registering, nriooru o. The start-up channel is started as a successively connected delay / with an input connected to the output of the high-frequency generator t, the L amplifier, the normal relaxer - phase synchronizer Srj, the front loader and the short form-factor. in the form of a successively connected strobe amplifier i2, the input of which is connected to the measuring chamber 3, the detector i3, the time selector 14, to the control input of which is under The driver is a short strobe-imiuls 11, and the driver is a non-pulse soros 1o. To the control inputs of gated amplifiers d and 12, a wide strobe pulse generator 1b is connected, the input of which is connected to the synchronization generator 2. To the input of the detector 13, the frequency divider G / is connected via the switch AND. The device works as follows. The high-frequency generator 1, controlled by the synchro-generator 2, generates a sequence of probing radio pulses (Fig. 2a) with a high duty cycle. These radio pulses come to the measuring chamber 3 with the sample and electromechanical transducers and to the input of the delay unit 7. The output of the chamber 3 acts like a series of electrical echo pulses damped during the period of the probe pulses (Fig. 26). A similar series of echo pulses (Fig. 2c) with an adjustable time interval between them comes from the output of the Zaderlski unit 7. From the series of echo pulses, using a wide strobe pulse (Fig. 2d), one radio pulse is selected (Fig. 2 and 3 - d and e). From the output of amplifier 8, a separated delayed radio pulse arrives at the input of a relaxor-phase synchronizer-a, in which it atroorates into a short video pulse with a falling front, which is firmly synchronized with the zero phase of the radio pulse zero (FIG. G). An impulse frequency divider can be used as a normal relaxer snf. From Oloka At the video pulse, nostunate to the lU impulse shaper, in which the rear frone of the video impulse is extracted and the impulse impulse of the time and amulnitus f (Fig. 6h) is generated. This impulse triggers a short strobe impulse driver (Fig. Ai) on device 12, IKOTOry, and is implemented as a linear voltage generator. The selected probe radio pulse from the output of the stubbed usnnel 12 sends to the detector s, the signal from the output of which (Fig. G3) is directed to the continuity of short video pulses (Fig. 3L) corresponding to the zero phase of the positive noluneriods. If the automatic recording of ultrasonic velocity measurements is maximum offset of the selected probing radio pulse exceeds the period of high-frequency filling to expand the measurement range, 1C of amplifier 5 output to the detector is fed through frequency divider 17, which divides the frequency of filling of the radio pulse, for example, by regenerative method, ha output of time selector 14 controlled by the short strobe pulse shaper AND, a dedicated loluper of the probing radio pulse (Fig. 3m) acts, which is collected The time – amplitude 4 transducer (Fig. 3N) is transforming. The amplitude of the sawtooth voltage is proportional to the time interval between the half period of the delayed radio pulse and the probing radio pulse. This voltage is converted by a voltmeter 5 to a constant voltage, which is recorded by device 6. Claim 1. An automatic recording device for measuring the ultrasound speed containing a high-frequency generator, the control input of which is connected to a synchronous generator, and the output to a measuring chamber with an image and an electromechanical transducer: MI, two channels for generating start and reset pulses of a time-to-amplitude transducer, the output of which is connected to a register via a peak voltmeter Operational device, characterized in that, in order to improve the accuracy and reliability of measurement, the analog of the formation of triggering pulses is implemented in the form of serially connected delay locks, whose input is connected to the high-frequency generator, gated amplifier, threshold relaxator, phaser, and a pulse impulse generator strobe Pulse, the channel of the shape of the IMPULSES reset is made in the form of serially connected gated amplifier, the input of which is connected to the measuring - amera, a frequency divider, a detector, a time selector, to the control input of which a short strobe pulse shaper is connected, and a reset pulse shaper, to the control inputs of gated TWA amplifiers of the formation, a strobe pulse generator is connected, the input of which is connected to sync signals -Base, 2. A device according to claim 1, characterized in that the threshold phase synchronizer relaxator is made in the form of a pulse frequency divider. Sources of information taken into account in the examination: 1.Truell R. et al. "Ultrasonic metopes in solid state physics," Mir, M., 1972, PAGE 266-268. 2. Kolesnikov, L. E. “Ultral Link Dimensions, ed. Stanlartov. M., Sh70. pp. 55-75. 3. “Methods and instruments for ultrasonic measurements, vol. 1. h. A, under ped. W. Mzzon, “Mir, M. .. 1966. p. 343-349, 371-378.  t llHii Li i m