SU1296847A1 - Device for measuring sound velocity - Google Patents

Abstract

This invention relates to a measurement technique. The aim of the invention is to improve the accuracy. In the device at the moment of time t, the pulse from the output of the generator 4 passes to the converter 5, which at the moment of time t emits an ultrasonic pulse. At time t, the ultrasonic pulse travels to transducer 5, and at time t transforms last into an electrical signal. An electric pulse from transducer 5 passes through an open analog key 8, after being amplified by amplifier 1, is fed to an electronic key 2. At time t, electronic key 2 generates a pulse whose amplitude is strictly limited at a certain level and at that moment insufficient for triggering multivibrator 3. At time tg, a secondary reflected ultrasonic pulse arrives at transducer 5, At time C, the second reflected signal is converted into electrical, and at time t, electronic spanner 2 produces a pulse whose amplitude is now sufficient to actuate multivibrator 3. Multivibrator srabaty- in & and a: at time t generator 4 sends a pulse converter 5 following. The time interval T, between the edges of the pulses of the electronic key 2, is counted at the same voltage level and is measured by the meter 7. 1 Il. With GO CJD O5 00 4

Description

I1296847

 The invention relates to measurement technology and can be used in hydraulics and underwater acoustics for measuring the speed of sound in liquids, in particular in water, 5

The purpose of the invention is to show accuracy.

The figure shows schematically the proposed device for measuring the speed of sound.

The device for measuring the speed of sound contains a series-connected amplifier 1, dongle 2, multivibrator 3, is generated at a certain level, and at this moment is not sufficient to trigger the multivibrator 3, the electronic delay of pulse formation is equal to l t –t.

At time t, a second-reflected (i.e., the past distance 41) ultrasonic pulse arrives at the transducer 5. The time it takes for ultrasound to travel 41 is equal. -t.

nS3

At time t, the second reflected signal is converted to electric, and at time

7 6

torus 4 and acoustic transducer 5 of time t, electronic key 2 generates a pulse, the amplitude of which is 5, the reflector 6 located at a fixed distance from the transducer 5, the meter 7 time intervals, the input connected to the output of the electronic key 2 ,, and the analog key 8, first input connected to the output of the multivibrator 3, the second - with the output of the acoustic transducer 5, the output - with the input of the amplifier 1.

The device for measuring the speed of sound works in the following way,

At time t. the pulse from the output of the generator 4 passes to the converter 5. At the moment of time t, the latter emits an ultrasonic pulse with a delay equal to D t, -t,.

At time t. an ultrasonic pulse reflected from the reflector 6 comes to the transducer 5, a distance of 21 is passed. The time T for which the ultrasound travels this distance is equal.

At the moment of time t, the pulse at the moment of time tg the ultrasonic pulse is converted in the converter 5 into electric: the acoustic delay of which is 7:

.-ts Electric pulse from converter 5, passed through an open analog switch 8, after amplification by amplifier 1 is fed to electronic switch 2. At time t, electronic switch 2 generates a pulse, the amplitude of which is strictly limited

on delay is equal to t t -t but that e -) after etog

It is now sufficient to trigger the multivibrator 3 operating in the synchronization mode r t. 20 Multivibrator 3 is triggered, and at time t, generator 4 sends the next pulse to converter 5. In this case, the electron (obviously

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repeats. The time interval is between. the pulse fronts of the electronic key 2 are detected at the same voltage level and measured with 30 meter 7.

Claims (1)

Invention Formula I A device for measuring the speed of sound, containing a series-connected generator and emitter, a series-connected amplifier, electronic key and multivibrator, the output of which 40 is connected to an input of a generator, and a reflector mounted at a fixed distance from the radiator, characterized in that, in order to increase accuracy, it 45 is equipped with a time interval meter, an input connected to the output of an electronic switch, and an analog switch, a first input connected to the output of a multivibrator, a second input to the output of an acoustic transducer, and an output to an amplifier input. VNII1SH Order 766/42 Circulation 500 Random polygons pr-tie, Uzhgorod, st. Project, 4 is limited at a certain level, and at this point is not enough for the operation of multivibrator 3, the electron delay in the formation of a pulse is equal to l t –t. At time t, a second-reflected (i.e., the past distance 41) ultrasonic pulse arrives at the transducer 5. The time it takes for ultrasound to travel 41 is equal. -t. nS3 At time t, the second reflected signal is converted to electric, and at time 7 6 on delay is equal to t t -t but that e -) after etog It is now sufficient to trigger the multivibrator 3 operating in the synchronization mode r t. Multivibrator 3 is triggered, and at time t, generator 4 sends the next pulse to converter 5. At the same time, the electron (obviously, this is a dikl repeats. The time interval between the fronts of the pulses of the electronic key 2 is sensed at the same voltage level and measured by the meter 7. Invention Formula I A device for measuring the speed of sound, containing a series-connected generator and emitter, a series-connected amplifier, electronic key and multivibrator, the output of which connected to the generator input, and a reflector mounted at a fixed distance from the radiator, characterized in that, in order to increase accuracy, it equipped with a time interval meter, an input connected to the output of the electronic key, and an analog key, the first input connected to the output of the multivibrator, the second input to the output of the acoustic transducer, and the output to the amplifier input. X . Subscription