SU1448211A1 - Acoustic ranger - Google Patents

Abstract

The invention relates to a measurement technique and can be used to measure distances or levels. The purpose of the invention is to improve the measurement accuracy of the monitored parameter. The acoustic distance meter contains a series-connected synchronizer 1, a generator of 2 probe pulses, an acoustic sensor 3, an amplifier 4, a puller 5 of pulses, a circuit 6 for time separation of signals consisting of three series-connected selectors 7, 8 and 9. The first selector 7 is connected to the synchronizer 1 and the information converter 10 is also connected to the synchronizer. The meter contains two reference frames of 11 and 12. The information converter 10 contains sequentially connected trigger 13 connected to the output of the first selector 7 and output of the third selector 9, integrator 14, to the reset input connected to the synchronizer 1, controlled amplifier 15 , comparison circuit 16, KLNUCH 17 and storage capacitor 18 connected to the control input of the controlled amplifier 15, reference voltage source 19 connected to the second input of the comparison circuit 16, and trigger 20, innocent with the output of the first selector 7 and the output of the second selector 8. 1 Cp f-ly, 2 ill. yy & O) 4 00 1C /. /

Description

The invention relates to a measurement technique and can be used to measure distances or levels by acoustic waves.

The purpose of the invention is to improve the measurement accuracy, FIG. 1 shows a block diagram of a meter j in FIG. 2, signal plots 5 characterizing the operation of a meter,

The acoustic distance meter contains successively connected synchronizer 1, oscillator 2 probe pulses 5 acoustic sensor ze amplifier 4, driver | 5 pulses, time signal separation circuit 6 consisting of three selectors 7-9 connected in series with the first selector 7 connected with synchronizer 1, transformer 10 informant, connected to synchronizer 1, and two reference reflectors 11 and 12 "In this case, information converter 10 contains series-connected trigger 13 connected Connected to the output of the first selector 7 and the output of the third selector 9 of the circuit 6, time separation of signals 5, the integrator 14, the installation input in the initial state connected to the synchronizer 1, the control amplifier 15. the comparison circuit 16, the key 17, Price 18 Connected to control, input of controlled amplifier 15, source; 19 reference voltage, connected to the second input of circuit 16, compared, trigger 20 connected to output of the first selector 7 and output of second selector 8 of circuit 6 temporary.; separation of signals.

The meter works as follows.

Synchronizer 1 generates pulses 21 (plot A in Fig. 2) with a follow-up period exceeding 1m the propagation time of acoustic pulses from acoustic sensor 3 to measuring reflector 22. Pulses 21 start oscillator 2 of probe pulses, the first selector 7 of time-separation circuit 6 and set The integrator 14 of the information transformer 10 is returned to the initial state.

A generator of 2 pulses of excitations excites an acoustic sensor 3, which emits an acoustic impulse toward the side of the reflectors 11 and 12 and the measuring reflector 22.

An acoustic pulse reflected from the first reference reflector 11, the second reference reflector 12 and the measuring reflector 22 is received by the acoustic sensor 3, amplified in the amplifier 4 and formed in the pulse shaper 5.

Thus, at the output of amplifier 4, a sequence of radio pulses is obtained (pulse 6 in FIG. 2),

After forming 5 pulses, they acquire the form shown in the plot & (Fig. 2). The outputs of the selectors 7-9 pass only pulses corresponding to the moments of reception reflected from the reference 11 and 12 and measuring 22 reflectors. At the same time, an output pulse passes through the output of the first selector 7, which corresponds to the moment of reception of the acoustic pulse reflected from the reference reflector 11; to the output of the second selector 8 from the reference reflector 12 and to the output of the third selector 9 from the measuring reflector 22.

The impulses passed through the circuit 6 for temporal separation of signals are shown in plots g, d, e (Fig. 2). The information contained in the time intervals between these pulses makes it possible in information converter 10 to obtain information on the measured distance, independent of the speed of sound propagation in the medium. In this case, the output of the information converter 10 is a voltage directly proportional to the distance from the reference reflector 11 to the measuring reflector 22.

Improving the accuracy of measuring distances is achieved due to the fact that the introduced distortions of signals in the radiating and receiving paths of the meter become the same when the reference and measuring time intervals are formed in the information converter.

Claims (1)

Invention Formula 55Acoustic distance meter containing series-connected synchronizer, probe pulse generator, acoustic 31D482 a sensor and an amplifier, a reproduction reflector of an information converter connected to a synchronizer, and a time division circuit consisting of serially connected first and second selectors, the outputs of each of which are connected to an information converter, and one input of the first selector is connected to synchronizer, characterized by the fact that, in order to increase the eleven measurement, it is supplied with a second; a reference reflector, a pulse shaper, the input of which is connected to the output of the amplifier, and a temporary signal separation circuit is equipped with a third selector connected to the output of the second selector and the input of the information converter, while the signal inputs of all three selectors are connected to the output of the pulse shaper. but 21 fpa.Z