SU1295363A1 - Meter of time intervals - Google Patents

Abstract

The invention can be used in computing and pulse technology. The aim of the invention is to improve the accuracy and speed of measurements of time intervals. The device contains a pulse generator 1, a transceiver transducer 2, a delay line 3, an amplitude limiter 4, an amplifier 5, an electron-beam indicator 6. To achieve this goal, a delay delay line 7, an element liHH 8, an adder 9, electronic keys 10 and P, analog-digital converters 12 and 13, block 14 comparison of codes, block 15 registration. The signal generated by the generator 1, is fed to the transceiving transducer 2 and the delay line 3. The transducer produces an acoustic signal, which, having passed through the medium under study, is again converted into an electrical signal and fed to amplitude limiter 4 and amplifier 5. 1 sludge. WITH

Description

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This invention relates to a pulsed technique.

The purpose of the invention is to improve the accuracy and speed of measurements of time intervals.

The drawing shows the block diagram of the device.

The device contains a pulse generator 1, the output of which is connected to a receiving-emitting electromechanical converter 2 and connected to the input of the delay line 3 (LZ), an amplitude limiter 4 connected in series with the converter 2 and the amplifier 5, an electron-beam indicator 6, the synchronizing input of which is connected to the output of the LZ 3 additional scanning LZ 7, the input of which is connected to the output of LZ 3, element OR 8, the input of which is connected to the outputs of LZ 3 and 7, adder 9, one input of which is connected to the output of amplifier 5, and the other connected to the output of the element OR 8, the output of the adder 9 is connected to the second input of the electron-beam indicator 6 and the second inputs of the first 10 and second 11 electronic keys, the first input of the key 10 is connected to the output of the LS 7, and the output to the input of the first analog digital converter (ADC) 12, the first input of the second, key 11 is connected to the output of LZ 3 ,, and the output is connected to the input of the second ADC-13, block 14 comparison of codes, the input of which is connected to two ADC 12 and 13, digital output of LZ 7 is connected to block 15 registration, the output of which is connected to block 14 comparison codes. The electromechanical transducer is in intimate contact with the test medium.

The device works as follows.

The generator 1 of rectangular pulses generates a signal that is fed to the receiving beam 2 and LZ 3. The converter 2 produces an acoustic signal, which, through the medium under study, is again converted into an electrical signal and fed to the amplitude limit 4 and the amplifier 5.

I

The delayed reference signal is fed to the synchronizing input of the indicator 6, and through the scanning LZ 7 fO

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to the second input of the element OR 8, to the first input comes a pulse directly from the element 3. The adder 9 (linear) adds the signals of the element 5 or 8 and the amplifier 3. The measurement of the time delay is performed by setting the indicator 6 on the screen using L3 3 of the reflected pulse so that the reference pulse is at a zero level before the leading edge of the reflected pulse. The signal from the output of the adder 9 comes to the electronic key 10, controlled by a pulse from LZ 7, and the key 11, controlled by a pulse from LZ 3. The signal from the output of the key 10, representing the linear sum of the voltage of the reflected pulse and the scanning pulse, goes to the input A / D converter 12, and a delayed reference signal is transmitted to 20 A / D converter 13, having passed a 1G key. Comparison unit 14 compares codes from two ADCs. When moving the scanning pulse along the reflected one, it passes through the intersection points of zero. At such moments, a signal appears at the output of block 14 that triggers block 15 of recording, memorizing the value of the time delay between the reference and scanning signals. The time intervals between the transitions of the reflected pulse through zero are measured.

25

thirty

35 T, 7, - € ;;

t T (C -

1 l.O,

T:

where 6 ,, is the time interval between

oporshm pulse and the transition through the zero q-ro pulse;

i-th - the period of oscillation of the reflected pulse. The frequency modulation index is calculated by the formula

  . - q-1,

The dispersion parameter of the medium is calculated by the formula

p-Mpsm ...

4ir (uF) 2 (m-n)

where M, M are the indices of frequency modulation in a pulse passing through the medium under study, respectively, m and n times

dr is the spectral pulse width;

t is the thickness of the test medium.

Claims (1)

Invention Formula A time interval meter containing a pulse generator, the output of which is connected to the input of the delay line directly and through a series-connected receiving-emitting electromechanical converter and an amplitude limiter to the amplifier input, the output of the delay line is connected to a synchronizing input of the electron-beam indicator, that in order to improve the accuracy and speed of measurements, a scanning delay line, an adder, an OR element, two keys, two analog-digital signals are introduced into it eobrazovate five 0 l, a code comparison unit and a registration unit, while the digital outputs of the scanning delay line are connected to the first inputs of the registration unit, and the analog output is connected to the first input of the OR element and the first input of the first key, the output of the delay line is connected to the second input of the OR element, with the first the input of the second key and with the input of the scan, the delay line, the output of the amplifier connected to the first input of the adder, the second input of which is connected to the output of the OR element, and the output is connected to the input of the electron-beam indicator and the second inputs of the first and second keys, the outputs of which are connected to the inputs of the first and second analog-to-digital converters, respectively, the outputs of which The code comparison unit is connected to the second input of the registration unit.