SU765767A1 - Ultrasonic device for measuring distances - Google Patents

Description

The invention relates to radar and can be used in ultrasonic range finders. An ultrasonic distance measuring device is known that contains an electric pulse generator connected to a radiating electro-acoustic converter, a series-connected receiving electro-acoustic converter, an electronic receiving unit, a gate, the second and third inputs of which are connected respectively to the outputs of an electric pulse generator and a temporary signal generator. bases, a counter and an indicator) N reference electroacoustic transducers located on fixed x hundred audio from the radiating electro-acoustic transducer, (N - 1) The communication units connected with the reference electroacoustic transducers 1.v However, this device does not provide vyuokoylochnosti-measurement. The purpose of the invention is to increase the accuracy of measurement. For this, an ultrasonic distance measuring device containing an electrical generator. pulses connected to a radiating electroacoustic converter, sequentially connected receiving electroacoustic converter, electronic receiving unit, valve, the second and third inputs of which are connected respectively to the outputs of the electric pulse generator and the time base signal generator, counter and indicator, N reference electroacoustic converters arranged at fixed distances from the radiating electroacoustic converter, (N-1) communication units connected to the standard These electroacoustic transducers, N serially connected time-code converters and comparators, (N-1) adders, N digit-analog converters (N-1) integrators, an output adder and a setpoint controller, and reference electroacoustic converters are connected to the first inputs of the corresponding converters time code, the second inputs of the comparators are connected to you

master moves, the inputs of the adders are pairwise connected to the outputs of the corresponding komgafator, the second inputs of the first and last adders are connected to the outputs of the first and last comparators, the first input of the first converter is a digit-analog connected to the output of the first comparator, and the first inputs of the rest are connected to the outputs of the corresponding adders, integrators included between the outputs of the corresponding digital-analog converters and the corresponding inputs of communication units, the outputs of which are connected to the inputs of the output adder, with tvet-, stvuyuiday input coupled to an output of the first transducer 1schfra analog, and the output - to the input of oscillator time base signal, the second inputs of the time code converters, digital-to-analog converters and integrators connected to the output of the generator of electric impulses.

FIG. 1 given the structural electrical circuit of the proposed device; in fig. 2 - time diagrams that show his work.

The device contains an electric and pulse generator 1, an electroacoustic transducer 2, an electroacoustic receiving transducer 3, an electronic receiving unit 4, a valve 5, a time base signal generator 6, a counter 7, an indicator 8, reference electroacoustic transducers 9, communication units 10, converters 1 i time-code comparators 12, adders 13, converters 14 digital-analog, integrators 15, output adder 16 and unit 17.

The device works as follows.

The generator 1 produces pulses {see FIG. 2, a), synchronizing the operation of the entire device. The next of them is nocTjTiaei to the radiating electro-acoustic transducer 2 and is emitted in the form of an ultrasonic wave into space. At the same time, the receiving electroacoustic transducer 3 and the transducers 11 are switched on. At the same time, a command is issued to start converting and integrating the input information by the transducers 14 and the integrators 15, the digital codes {see 2, b, c, d, d) proportional to the propagation times of the ultrasonic wave from the radiating electroacoustic transducer 2 to the reference electroacoustic transducers 9. The propagation time of the ultrasonic wave from the radiating electroacoustic transducer 2 to each of the electroacoustic transducers 9 differs depending on the speed ultrasound propagation in this area, i.e. on temperature.

At the comparators 12, the output codes are compared with the permanent codes of the setter 17, i.e. with constant time codes for the propagation of an ultrasonic wave at a constant, predetermined velocity of ultrasound. The differences between setpoint adjuster codes 17 (see Fig. 2, e, g, i, and) algebra) obtained from the outputs of comparators 12 are summed on adders 13, and the output codes of the first and second comparators 12 are summed on the first of the adders 13, the second - the second and third, etc.

At the output of each of the adders 13, digital codes are formed (see Fig. 2, l, m, n) each of which is proportional to the temperature gradient in the corresponding section of the path, passed by ultrasound. These codes are converted into voltages (see Fig. 2, o, p, p), which are integrated with the help of integrators 1 The resulting voltages (see Fig. 2, t, y), switched by the communication units 10, are summed at the output an adder 16 with a voltage (see Fig. 2, k) is proportional to the initial ultrasound velocity, which is formed from a cigar (see Fig. 2, -e).

The communication blocks 10 are connected to the output adder 16 alternately outputs. Integrators

15 in accordance with the achievement of the ultrasonic wave of each reference electroacoustic transducer 9. Output adder

16 controls the frequency of the time base generator 6. Valve 5, which is opened by a pulse (see Fig. 2, a) from generator 1, passes signals (see Fig. 2, t) of generator 6 to counter 7. After the ultrasonic head reaches the receiving electroacoustic transducer 3, the signal closes the valve 5. On the counter 7, a digital code is formed, which is proportional to the measured distance. Indicator 8 allows you to register this distance.

The proposed device allows to obtain at the output of the output adder 16 a signal (see. 2,,), which is a piecewise linear approximation of the velocity function. propagation of ultrasound at a measurable distance.

The change in the frequency of the generator 6 of the time base I according to this law is nothing other than a change in the scale of conversion of the measured propagation time of the ultrasonic wave from the radiating electroacoustic transducer 2 to the receiving electroacoustic transducer 3 into a digital code in accordance with the law of the change in the velocity of ultrasound propagation at the measured distance nii.

In the proposed arrangement, the measurement accuracy is increased.

Claims (1)

Invention Formula An ultrasonic distance measuring device containing an electric pulse generator connected to an emitting electro-acoustic transducer, followed by: coherently connected receiving electro-acoustic transducer, electronic receiving unit, valve, the second and third inputs of which are connected to the outputs of the electric pulse generator and. a time base generator, a counter and an indicator, N reference electroacoustic converters located at fixed distances from the radiating electroacoustic converter, (N-1) communication units connected to the reference electroacoustic converters, characterized in that for measuring accuracy, N series-connected time-code converters and comparators (N-1) adders, N digit-analog converters, (N-1) integrators, output 1 adder and setting unit, and Alone electroacoustic transducers are connected to the first inputs. the corresponding time heaters are the code, the second inputs of the comparators are connected to the outputs of the sensor, the inputs of the adders are connected in pairs to the outputs of the corresponding comparators, the second inputs of the first and last adders are connected to the outputs of the first and last comparators, the first input of the first converter tdafra-analog is connected, j with the output of the first the comparator, and the first inputs of the rest - with the outputs of the corresponding adders, the integrators are connected between the outputs of the corresponding 6 common converters and the corresponding analog connecting inputs of communication units, the outputs of which are connected to the inputs of the output adder, the corresponding input of which is connected to the output of the first converter. The analog-to-analog converter and the output to the input of the time base signal generator, the second inputs of time-code converters, converters Sch1fra- analogue and integrators connected to the output of the electric pulse generator. Sources of information taken into account in the examination 1. French patent number 1477534, cl. G 01 8, 1967 (prototype). P P n o- P -Rn U / g.2