SU1201791A2 - Ultrasonic distance meter - Google Patents

Abstract

ULTRASONIC PULSE DISTANCE METER St. , No. 901966, about t. L., Which is the fact that, in order to improve the reliability of measurements, an additional coincident element, the first element AND and the third trigger, and the second element AND, the output of which is connected, are entered into it sequentially. to the Reset input of the third trigger, the direct output of which is connected to the gate input of the decoder, and the outputs of the second counter and the second memory block are connected respectively to the inputs of an additional coincidence element, the output of which is n with the input element is NOT, and the second inputs of the first and second elements are AND-connected to the second input of the first switch.

Description

one

This invention relates to an ultrasonic measuring technique and can be used in various fields of industry and construction.

The purpose of the invention is to increase the reliability of measurements.

The drawing shows a block diagram of the proposed device.

The ultrasonic pulse distance meter consists of a trigger pulse generator 1, an acoustic transducer 2, a reflector 3, an amplifier 4, a display unit 5, the first block 6 and a memory, the first switch 7, a decoder 8, the first 9 and second 10 trigger, the second block 11 memory, the second switch 12, the reference frequency generator 13, the second counter 14, the first counter 15, two elements 16 and 17 of the match, the element NOT 18, the two elements And 19 and 20 and V of the third trigger 21.

The device works as follows.

The trigger pulse generator 1 and the triggers 9 and 10 are set to one, and the counters 14 and 15 and the memory blocks 6 and 11 are in the zero state. The trigger 10 through the second switch 12 connects the input of the first counter 15 to the output of the generator 13 of the reference frequency. The pulses of the generator 1 excite the acoustic transducer 2. The signal from the reflector 3 is fed to the acoustic transducer 2 and through the amplifier 4 to the switch 7, which brings the first trigger 9 to the zero state. When the codes recorded in the first counter 15 and the first memory block 6 are equal, the first coincidence element 16 generates a pulse that arrives at the second counter 14 and zeroes the first counter 15. The first cycle of the first counter 15 repeats until those until the acoustic transducer 2 receives an acoustic signal reflected from the surface.

The reflected acoustic signal is converted in the acoustic transducer 2 into an electrical pulse, amplified by amplifier 4 and through the first switch 7

Diet trigger 10 to zero. The second switch 12 disables the input of the first counter 15 from the output of the generator 13 of the reference frequency, the value of the code recorded in

The second counter 14 is stored in the second memory block 11. In the second coincidence element 17, a comparison is made between the measured distance code of the previous measurement cycle stored in the second memory block II and the code accumulated in the second counter 14. This comparison can be like

15 for all bits of these two codes, and without taking into account a few lower-order bits. If at the time of the appearance of the reflected signal at the output of the first switch 7 codes

20 in the second memory block 11 and the second counter 14 are the same, then the enable signal from the output of the second match element 17 goes to the first I19 element.

25 At the input of the second element And 20 due to the presence of the element HE 18, there is a prohibitive signal. Under these conditions, the signal from the output of the first switch 7 passes through the first element I 19 and is fed to the installation input of the third trigger 21, which is translated (or remains) into a single state. Wherein

35, the enable signal from the direct output of the third flip-flop 21 arrives at the gate input of the decoder 8 and enables decryption of information copied from

40 of the second counter 14 to the second memory block 11. The decrypted information is provided to the display unit 5.

If the codes in the second memory block 11 and the second counter 14 are not

45 coincide, then from the output of the second element 17 coincidence, the inhibiting potential is applied to the input of the first element of AND 19. The same potential is inverted by the element HE 18

50 and already arrives as an enable signal to the second element AND 20. The signal from the first switch 7 passes through the second element AND 20 and flips the third trigger

55 21 to zero state. At the same time, the strobe is removed from the decoder 8 and the contents of the second memory block 11 are displayed on the display.

31201791

Acoustic transducer 2 cycle distance is compared with

and the reflector 3 is on the standard-measured in the previous cycle

number of pulses. When pmehés occur in the reception recorded in the second counter 14, in the nominal path, the codes of the measured distances are determined by the measured distances and do not coincide with the indication

no measured distance is given.

At. Such a construction of the circuit thus increases the accuracy of the device measured at each distance measurement.

Claims (1)

ULTRASONIC PULSE METER DISTANCE by ed. St. No. 901966, which is characterized by the fact that, in order to increase the reliability of measurements, an additional coincidence element, a first element And and a third trigger, and also series-connected element NOT and a second element And, the output of which is connected to the reset input of the third trigger, the direct output of which is connected to the gate input of the decoder, and the outputs of the second counter and the second memory block are connected respectively to the inputs of the additional matching element, the output of which is connected to the input ohm NOT element, and the second inputs of the first and second AND-elements are connected to the second output of the first switch. > ι 1201791 2