SU1017930A1 - Ultrasonic device for measuring vibration parameters - Google Patents

Abstract

ULTRASONIC DEVICE FOR MEASURING VIBRATION PARAMETERS, containing a frequency controlled oscillator with an emitter connected to its first output, a receiver connected in series, an amplitude amplifier with automatic gain control, a frequency-phase shift amplifier and a synchronous detector, an odor-curtain / curtainer / curtainer curtain unit, an amplitude-reducer bead curtainer, an amplitude adjustment unit, and one part of a one-piece set with one another, a frequency amplifier, an amplifier, an amplitude generator, and a synchronous detector with the second output of the generator, to the input of which are connected in series, the unit automatically under, frequency settings and additional The power receiver is installed at a fixed distance from the radiator,; and the recorder is different in that, in order to determine the spectrum of instantaneous vibration speeds, it is equipped with a sequentially connected pulse shaper, a pulse counter, a memory unit and an adder and a series-connected phase de - vector, amplifier-shaper, counter with preset, circuit No reference frequency generator, output of circuit I is connected to the second (L input of pulse counter, input of generator of pulses keys to the output of the synchronous detector, a first input of the phase detector is coupled to the second output of the controlled oscillator frequency, and the second - to the output of the amplitude with automatic gain control, and the adder output is connected to a second input of the memory, which is connected to the output of a recorder. with so

Description

The invention relates to a measurement technique and can be used to determine the quantitative characteristics and frequency range of vibration parameters.

An ultrasonic device for measuring vibration parameters is known, which contains an ultrasonic oscillator, located in the medium under study, an ultrasonic oscillation emitter and receiver, a selective amplifier and a recording device Cl The known device does not have a sufficiently high accuracy in measuring vibrations of arbitrary shape.

The closest in technical essence to the invention is an ultrasonic device for measuring vibration parameters, comprising a frequency controlled oscillator with an emitter connected to its first output, a series-connected receiver, an amplitude amplifier with automatic gain control, a frequency-phase shift amplifier and a synchronous detector. the amplifier of the frequency-phase oscillations and the synchronous detector are connected to the second output of the generator by the second inputs, to the input of which are connected in series the automatic frequency control unit and the additional receiver installed at a fixed distance from the radiator, and the generator t2}.

A disadvantage of this device is that it only allows you to determine the average value of the vibration speed.

The purpose of the invention is to determine the spectrum of the instantaneous vibration rates.

The goal is achieved by the fact that an ultrasonic device for measuring vibration parameters, containing a frequency controlled oscillator with an emitter connected to its first output, a receiver connected in series, an amplitude amplifier with automatic gain control, a frequency-phase shift amplifier and a synchronous detector, amplifier frequency (phase shifts and synchronous detector with the second inputs connected to the second generator output, which are connected to the input of the series-connected automatic unit The frequency tuning and the auxiliary receiver, which is installed at a fixed distance from the radiator, and the recorder are equipped with a series-connected pulse shaper, a pulse counter, a memory unit and an adder, and a series-connected phase detector, a power amplifier, and a counter with preset circuit I and reference frequency generator, circuit output I connected to the second input of the pulse counter, the input of the pulse generator connected to the output of the synchronous detector, the first input of the fa-. the second detector is connected to the second output of a frequency controlled oscillator, and the second to the amplitude amplifier output with automatic gain control, and the output of the adder is connected to the second input of the memory unit, to the output of which the recorder is connected. -scale ultrasound device for measuring vibration parameters.

The device contains a frequency-controlled generator 1, an emitter 2 connected to it, an ultrasonic oscillation receiver 3 connected in series, an amplitude amplifier 4 with automatic gain control, a frequency shift amplifier 5, a synchronous detector b, a frequency shift amplifier 5 and a synchronous detector 6 connected to the second output of a frequency controlled oscillator

1 / to the input of which an automatic frequency control unit 7 is connected, an input connected to an additional receiver 8, a sequentially connected pulse shaper 9, a pulse counter 10, a memory block 11 and an adder 12, and: also the phase detector 13 connected in series, a shaper amplifier 14 , counter 15 with preset,

circuit 16 And, the second input of which is connected to the generator 17 of the reference frequency, and the output of the second input counter 10 pulses, the input of the imaging device 9 pulses connected to the output of the synchronous detector b, and

the first input of the phase detector 13 is connected to the second output of the generator 1, the second to the output of the amplifier 4 amplitudes with automatic gain control, the output of the adder

12 is connected to the second input of the memory unit 11, and the recorder 18 is connected to its output. The investigated vibrating surface 19 is placed in the medium 20. I; The device works as follows.

The frequency controlled oscillator 1 generates a continuous sinusoidal signal, which is converted by the radiator 2 into an ultrasonic signal and emitted ± s through the locusable medium 20 in the direction of the vibrating surface 19 and the auxiliary receiver 8, Block 7 automatic

frequency tuning adjusts

the frequency of the controlled oscillator 1 so that in the gap the radiator 2 - the additional receiver 8 supports a constant phase shift. This achieves the constancy of the wavelength of the ultrasonic oscillations regardless of the speed of ultrasound propagation, thus eliminating the dependence of the measurements on the parameters of the localized medium :. The ultrasonic signal reflected from the vibrating surface 19 has an additional phase shift relative to the output signal of the generator 1, depending on the instantaneous position of the vibrating surface 19 relative to the radiator 2 and the receiver 3, which are rigidly connected to each other. The rate of change of the additional phase shift characterizes the rate of vibration.

The ultrasonic signal reflected from the vibrating surface 19 is converted by the receiver 3 into an electric signal, amplified and stabilized by the lip of the ampli tude in the 4 amplitude circuit with automatic gain control and fed to the input of the amplifier 5 frequency-phase shifts, which is made in the form of 11-series-connected blocks of multiplication by two with frequency conversion.

From the output of amplifier 5, the signal is fed to the first input of the synchronous detector b, and to its second input the signal is from the frequency controlled oscillator 1, with the result that the signal at the output of the synchronous detector 6 is frequency modulated, with a certain value of its instantaneous frequency instant vibration velocity.

From the output of the synchronous detector b, the signal arrives at the shaper of 9 pulses, from the output of which pulses of a regular shape are fed to the first input of the counter 10 pulses, and the counter 10 is reset to zero and the impulse counting begins at the same time: the LB arriving at the second counting input.

With the help of a phase detector 13, whose inputs are connected to frequency controlled oscillator 1 and amplitude amplifier 4 with automatic gain control, electrical signals are selected that are proportional to vibration, then amplified, amplified and converted to rectangular the pulses with the help of amplifier 14 and further are fed to the counting input of the counter 15 with the default setting. By setting the counting coefficient of the counter 15, the accumulation time of the number of pulses arriving at its input, i.e. The required length of the design is chosen, which determines the accuracy of the measurement. A signal corresponding to the accumulation time from the output of counter 15 opens circuit 16 I and allows the passage of pulses of the reference frequency generator 17

to the counting input of the counter 10.

 Counter 10 counts the number of pulses from generator 17 for the duration of the enable signal coming from the amplifier-former

5; 14 pulses and vice versa, the propal velocity is an instantaneous value of the velocity,

i The number of pulses transmitted through the counter 10 determines ad0; the spans of the memory block 11; information about the number of measurements of this value, the vibration velocity, and the signal p of the memory block 11 arriving at the first input is accumulated in the device.

5 of the commutator 12, on the second input of which signal 1 is constantly present, generates a carry signal 1, which is recorded in memory block 11 at the address specified by the signal-Nal of counter 10.

: After the accumulation interval ends in memory block 11, information on the spectrum of instantaneous values of vibration velocity is accumulated in the form of the number of measurements of this magnitude 5 of vibration velocity during the accumulation time. This information is fed to the input of the recorder 18 for display.

.. Thus, in this device, as compared with the α-prototype, it is possible to measure the instantaneous spectrum of the velocity of vibration.

Claims (1)

ULTRASONIC DEVICE FOR MEASURING VIBRATION PARAMETERS, comprising a frequency-controlled oscillator with a radiator connected to its first output, a series-connected receiver, an amplitude amplifier with automatic gain control, a frequency-phase shift amplifier and a synchronous detector, a frequency-phase shift amplifier and a synchronous detector with second inputs the second output of the generator, to the input of which are connected in series, the automatic frequency control unit and additional a receiver installed at a fixed distance from the emitter and a recorder, characterized in that, in order to determine the spectrum of instantaneous vibration speeds, it is equipped with a pulse shaper, a pulse counter, a memory unit and an adder, and a phase detector, an amplifier-former, a counter with a preset, an AND circuit and a reference frequency generator, g the output of the And circuit is connected to the second input of the pulse counter, the input of the pulse shaper is connected to the output of the sync of the detector, the first input of the phase detector is connected to the second output of a frequency-controlled oscillator, and the second to the output of an amplitude amplifier with automatic gain control, and the output of the adder is connected to the second input of the memory unit, to the output of which a recorder is connected. SU „., 1017930