SU808994A2 - Meter of oscillation amplitude distribution on piezoelectric quartz crystal plat surface - Google Patents

Description

one

The invention relates to radio measurements and can be used in the production of piezoquartz resonators.

According to the main author. St. No. 445927, a device is known for measuring the distribution of oscillation amplitudes over the surface of a piezoquartz plate, comprising transmitting and receiving electroinuclear tubes, horizontal and vertical oscillators, a harmonic generator, a low-pass filter, a video amplifier, two frequency dividers. The output of the harmonic oscillator is connected through the first frequency divider to the input of the horizontal sweep generator, and through the first and second frequency dividers to the input of the vertical sweep generator. The quartz resonator under investigation is placed in front of the screen of the transmitting tube and connected to a harmonic oscillator l.

In this meter, the transmission time of each element of the transmitted image line is commensurate with the period of the measured oscillations of the piezoquartz, which does not allow the measurement, nor at any time moment of the period

oscillations of piezoquartz. Thus, the meter does not provide a measurement of the dynamics of the deformation of piezoquartz.

The purpose of the invention is to expand the functionality, make it possible to measure the dynamics of the deformation process at any time in a period of oscillation of the piezoquartz plate.

The goal is achieved by the fact that, in the meter of the distribution of the amplitudes of oscillations on the surface of the piezoquartz plate, contains transmitting and receiving electron-beam tubes, horizontal and vertical oscillators, a harmonic generator, a low frequency filter and a video amplifier, two frequency dividers, and a generator output

0 harmonic oscillations are connected through the first frequency divider to the input of the horizontal sweep generator, and through the first second frequency removers to the vertical generator input, the quartz resonator under investigation, located in front of the screen of the transmitting tube, is connected to the generator of harmonic oscillations and

An analog switch was introduced by the latter, whose information input through the first adjustable delay line is connected to a load resistor, the control input of the analog switch through a matching unit, one input of which is connected through the second meander shaper to the output of the first adjustable delay line, and the second to the output of the second adjustable the delay line, the second adjustable delay line and the sampling pulse generator are connected to the forward trigger output and through the third line, the delays to the trigger setup input and null state, and the trigger input unit through the first square wave generator connected to the output of the amplifier, the analog switch output through the filter and video amplifier connected to the modulator receiving a cathode ray tube.

The drawing shows a diagram of a measuring instrument for the distribution of oscillation amplitudes along the surface of a piezoquartz plate.

The device contains a transmitting cathode-ray tube 1, filter 2, video amplifier 3, receiving cathode-ray tube 4, quartz resonator 5, oscillator b harmonic oscillations, amplifier 7, first frequency divider 8, horizontal oscillator 9, amplifier 10, second divider 11 frequency, oscillator 12 vertical, load resistor 13, first adjustable delay line 14, analog: key 15, first shaper 16, trigger 17, third delay line 18, sampling pulse shaper 19, coincidence block 20, vtor an adjustable delay line 21, the second driver 22 meander.

The device works as follows.

When the power is connected, the generator 6 generates electrical oscillations, the frequency of which is determined by the parameters of the quartz resonator 5, which are amplified in the amplifier 7 and fed to the inputs of the sweep generators 9 and 12 through the respective frequency dividers 8 and 11, which ensures synchronous operation of the horizontal and frame sweeps of the receiving 4 and transmitting 1 tubes. Using a tube 1 on the resistor 13, an electrical signal is extracted, the magnitude of which is proportional to the deformation of the resonator 5. This signal passes through the delay line 14; Shaped into pulses in the driver circuit 22 and is fed to one of the inputs of the matching unit 20, the pulses from the driver circuit 19, which is triggered by a pulse from the output of the trigger 17, arrive at the stroke of the block 20.

the input by the driver circuit 16, to the input of which electrical oscillations are received from the output of the amplifier 7. The first adjustable delay line 14 provides the reception of the leading edges of pulses from the circuit outputs of the driver 22 and 19, which is registered by means of the coincidence block 20. When this occurs, the front edge of the pulse is selected, selecting the “ki” coming from the output of the former 19 to the input of the second controlled delay line 21. From the output of the delay line 21, the sampling pulse arrives at the input of the block 20 coincidence, with

this duration of the pulse block 20

the coincidence is much less than the duration of the period of the measured oscillations of the resonator 5, which is provided by the driver 19. An adjustable delay line 21 permits shifting

in time of the sampling relative to the beginning of the period of oscillations arriving at the information input of the analog switch 15. When a pulse arrives from a block of 20 coincidence on

the control input of the key 15 at the output of the latter appears in a signal that is proportional to the input signal at the moment of interest (specified using the delay line 21)

time period of measured oscillations. This signal through the filter 2 and the video amplifier 3 acts on the modulator of the receiving tube 4, which converts it into an image of the luminous point of the corresponding brightness. The overall image across the entire screen is made up of a set of light points due to the continuous operation of the 9 and 12 sweep generators. The trigger 17 is reset by its own signal delayed in time with the help of the third delay line 18. The delay time is determined by the formula in.

where B is the distance between the metal fiber # 1 and the horizontal tube;

Y - the speed of the beam horizontally tube.

Claims (1)

1. USSR author's certificate No. 445927, cl. G 01 R 29/22, 1972.