SU823824A1 - Ultrasonic phase meter of vibrational displacement - Google Patents

Description

The invention relates to measuring equipment and can be used in vibration tests and in ultrasonic equipment. ,

A device is known for measuring ^e parameters of vibration by an ultrasonic phase method, comprising a master oscillator of a carrier frequency, a converting element and a phase. detector (1].

A disadvantage of the known device is the presence of non-linear distortion of the output signal.

Closest to the invention in technical essence and achieved. the result is an ultrasonic "5 phase vibration displacement meter containing a serially connected master oscillator, a radiating transducer, a transducer and a phase detector, the second input 20 of which is connected to the output of the master oscillator [2].

A disadvantage of the known meter is the low measurement accuracy due to the presence of non-linear distortion of the output signal due to the arbitrary selection of the operating point of the emitting and. receiving converters.

The purpose of the invention is improving the accuracy of measurements.

This goal is achieved in that the ultrasonic phase vibration meter is equipped with a serially connected amplifier-driver, the input of which is connected to the output of the phase detector, circuit I, a commutator, a stepper motor and an angle-shifting converter, the output of which is connected to a radiating transducer, a clock generator, the output of which connected to the second input of the circuit AND, the output of the receiving transducer is connected to the second input of the phase detector.

The drawing shows a block diagram of a meter.

The vibration displacement meter contains a serially connected master oscillator 1, emitting transducer 2, a receiving transducer 3 and a phase detector 4, the second input of which is connected to the output of the master oscillator 1, serially connected amplifier-shaper 5, the input of which is connected to the output of the phase detector 4, circuit b And, the switch 7, the stepper motor 8 and the angle-displacement transducer 9, the output of which is connected to the emitting transducer 2. The output of the receiving transducer 3 is connected to the second input ovogo detector 4. The second input of AND circuit 6 is connected to clock pulse generator 9L0.

The device operates as follows.

From the output of the master oscillator 1, an electrical signal, transmitted to the emitting transducer 2, is converted. acoustic ultrasonic vibrations that reach the surface of the test object 11 are reflected from it and fed to one of the inputs of the phase detector 4, the other input of which receives the reference signal from the output of the master oscillator 1.

The output signal from the phase detector 4 is fed to an amplifier-driver 5, where it is converted from a sinusoidal low-frequency signal into rectangular pulses *. The signals from the output of the amplifier-driver 5 are fed to the first input of the And circuit 6, to the second input of which the pulses of the generator 10 clock pulses are received.

. From the output of circuit 6 And the input of the switch 7 receives pulses, from the output of which the signals are supplied to control the mode of the stepper motor 8. When 8 pulses are received on the windings of the stepper motor 8 pulses, the motor rotor rotates uniformly and moves the angle-displacement transducer 2 mounted on the transducer 9. The phase _in Nala The signal reflected from the object is changed with respect to the reference signal input to the second input of the phase detector 4, the output of which appears a sinusoidal signal, a frequency It linearly depends on the speed of the emitting transducer relative to the object. The trailing edge of the pulse coming from the shaper amplifier 5 corresponds to the optimal distance Rtf · Thus, at the moment of the termination of the rectangular pulse, circuit 6 AND closes, and the pulses from its output cease to flow to the coch® * tripod 7. Then, the converter 9 is angled the movement will fix the distance R _o , which corresponds to the optimal mode of operation of the vibration displacement meter.

The proposed meter allows to increase the accuracy of the measurement by reducing the measurement error when choosing the operating point at a distance of 8®

Claims (2)

The invention relates to a measuring technique and can be used in vibration tests and in ultrasonic equipment. A device is known for measuring vibration parameters by an ultrasonic phase method, which contains a carrier frequency generation, a transducer element and a phase detector tl. A disadvantage of the known device is the presence of nonlinear distortion of the output signal. The closest to the invention according to the technical essence and the achieved result is an ultrasonic phase vibration displacement meter containing a series-connected master oscillator, a radiating transducer, a receiving transducer and a phase detector, the second input of which is connected to the output of the master oscillator 2. A disadvantage of the known meter is the low measurement accuracy due to the presence of nonlinear distortion of the output signal due to the arbitrary selection of the operating point of the radiating signal and. receiving converters. The purpose of the invention is to improve the measurement accuracy. The goal is achieved by the fact that the ultrasonic phase vibration displacement meter is equipped with a sequentially connected power amplifier / whose input is connected to the output of the phase detector, an AND circuit, a switch, a stepping motor and a transducer Angle displacement f whose output is connected to an emitter 1f converter, clock generator, the output of which is connected with the second input of the And circuit, the output of the receiving transducer is connected to the second input of the phase detector. The drawing shows a block diagram of the meter. The vibration displacement meter contains a series-connected generator 1, 1, a radiating converter 2, a receiving converter 3 and a phase detector 4, the second input of which is connected to the output of generator 1, series-connected shaper amplifier 5, the input of which is connected to the output of phase detector 4, circuit b And / switch 7, a stepping motor 8 and an angle-displacement converter 9, the output of which is connected to the radiating converter 2. The output of the receiving converter 3 is connected to the input input ohm phase detector 4. To the second input of the circuit 6 and connected to the generator 910 clock pulses. The device works as follows. From the output of the generator 1 zadachtsy, the electrical signal received from the radiating transducer 2 is converted into acoustic ultrasonic vibrations, KOTOix e reach the surface of the object under study 11, are reflected from it and fed to one of the inputs of the phase detector 4, to the other input of which the reference signal arrives from the output of the master oscillator 1. The output signal from the phase detector 4 is fed to the amplifier driver 5, where it is converted from a sinusoidal low-frequency signal into pulses, square, forksh. The signals from the output of the amplifier-shaped bodies 5 arrive at the first internal circuit of circuit 6 I, to the second input of which the generator pulses of 10 clock pulses are delivered. . From the output of circuit 6 and to the input of switch 7, pulses are received, from the output of which signals are supplied to control the stepping motor 8. When a pulse rotor arrives at the windings of the stepping motor 8, rotates uniformly, the angle-displacement fixed on the transducer 9 radiating converter 2. At the same time, the phase of the SIG signal reflected from the object under study varies relative to the reference signal supplied to the second input of the phase detector 4, the output of which is a sinusoidal signal whose frequency linearly depends on the speed of the radiating transducer relative to the object. The falling edge of the pulse, entered from amplifier-former 5, corresponds to the optimal distance Rjj. Thus, at the time of the termination of the rectangular impulse, the circuit b closes and the pulses from its output no longer reach the 4th switch 7. Then the angle-displacement transducer 9 will fix the distance RO, which corresponds to the optimal mode of the vibration displacement meter. The proposed meter makes it possible to increase the measurement accuracy by reducing the measurement dimension when selecting a working point at a distance. Invention Ultrasonic phase vibration meter containing serially connected master oscillator, radiating transducer, receiving transducer and phase detector, the second input of which is connected to the output of the master oscillator. It is distinguished by the fact that, in order to improve the accuracy of measurements, it is equipped with series-connected amplifier-shaped a telegram whose input is connected to the output of the phase detector, a circuit and, a switch, a stepper motor and an angle-displacement transducer whose output is connected to a radiating transducer, a clock pulse generator whose output is connected to the second input of the circuit I, the output of the receiving transducer is connected to the second input phase detector. Sources of information taken into consideration in the examination 1. Testing and quality control of machines and devices. Gorky, Volga Book Publishing House, 1972, no. 13, p. 77. 2, Redchikov V.V. Ultrasonic phase method for measuring vibration displacement. Knowledge, VDNTP them. Dzerzhinsky, 1973, p. 194-199 (prototype).