SU449326A1 - Ultrasonic Pulse Range Meter - Google Patents

Description

one

The invention relates to ultrasonic measuring devices and can be used for acoustic measurement of distances in air.

Devices for measuring distances in gaseous media are known that allow these measurements to be made with regard to the parameters of the medium.

The disadvantage of such devices is the use of an additional electroacoustic emitter and receiver in the channel for generating a correction signal and the creation of conditions for them that are strictly identical to the operating conditions of the main electroacoustic emitter and receiver (temperature, spectral composition of the localized medium, pressure, humidity, etc.) .

The purpose of the invention is to provide distance measurement taking into account the properties of the propagation medium.

This is achieved by the fact that the range meter is equipped with a sawtooth generator, the input of which through electronic keys is connected to the output of the direct path and the master generator, and the output

through the frequency control unit to the input of the quantizing pulse generator.

The drawing shows a structural diagram of the range meter.

The range meter contains the master oscillator 1, the multivibrator 2, i eiierator of ultrasonic oscillations 3, the ultrasonic emitter 4, the ultrasonic receiver 5, the receiving and amplifying unit 6, the detector 7, the electronic clock 8, 9, and a time-shift transducer. 10, the sawtooth voltage generator 11, the frequency control unit 12 of the quantizing pulse generator 13, the electronic switch 14 to the indicating unit 15.

Ultrasonic emitter. 4 and the ultrasonic receiver 5 are placed at a reference distance L

On a signal given by the generator 1, B1, which completes the rectangular impulses of a certain porosity, ikoyuch: i e generator 3, multivibrator 2 and trigger g1r “generator of the time delay of the delayed Y. generator 3 oscillates electrostimulator 3 and heats a wave of sound pulses, the duration of which is slightly longer than the time of the lateral radiation of the reference racial-5 ultrasonic pulse passing to the receiver 5. At this time, the key 9 is closed and the key 8 is open. A synchronizing pulse from generator 1 passes to generator 11, it starts up, and a pulse 10 that passes through a reference distance probes 10, fixing the level of the sawtooth voltage, which through unit 12 controls the generator 13. An echo pulse received by receiver 5 through an amplifying block 6, the detector 7 and the key 9, open 15 after the end of the action of the pulse of the multi-vibrator 2, is fed to the block 1O and turned off. The key 14 is open for the time of the operation of block 1O and from the generator 13 to the input of the indicating unit 15 passes a stack of quantum-20 pulses, the number of which is determined by the measured distance in the localized environment and changes in propagation conditions 4493 26 4 is fixed; generator level 11. - -, -.- Subject of the invention: Ultrasonic pulse range meter containing a master oscillator, a multivibrator, an ultrasonic oscillator, an electroacoustic emitter and receiver, a receiving-amplifier unit, a detector, electronic keys, a time delay trigger converter An indicative unit, different in that, in order to ensure that the distances are measured, taking into account the properties of the propagation medium, it is equipped with a sawtooth generator, the input of which is through tronic keys Po tsclyuchen to the output of the receiving path and the clock and output via a frequency control unit is connected to the input of the pulse generator quantizing.

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