SU1583869A1 - Apparatus for checking resonance frequency of quartz crystalline elements - Google Patents

Abstract

The invention relates to instrumentation technology and can be used to control the resonant frequency of quartz crystalline elements. The purpose of the invention is to increase the reliability of control results. Another goal is enhanced functionality. The high frequency generator 1 generates a signal whose average frequency is measured by a frequency meter 2. The reference frequency from the frequency meter is fed to frequency divider 3, where it is reduced to the value required for modulating the high frequency oscillator 1. The output signal of frequency divider 3 synchronizes the modulator 4, from which the signal arrives at the attenuator 5 and further to the input of the high-frequency generator 1. If the frequency of the high-frequency generator differs from the resonant frequency of the test object, the threshold element 10 blocks the counter 11, sig al to the output terminal 19 is absent and the grinding object continues monitoring. When the resonant frequency of the control object is equal to the frequency of the high-frequency generator 1 at the output of the threshold element 10, there is no signal, counter 11 captures the pulses arriving at its input and, with a certain accumulation, sends a signal to terminal 19, which causes the control object to stop grinding. 2 Il.

Description

The invention relates to instrumentation engineering and can be used to control the resonant frequency of quartz crystal elements.

The purpose of the invention is to increase the reliability of control results and expand functionality.

Figure 1 shows the functional diagram of the device; Fig. 2 is a diagram of the connection of the device1 to the control object.

The device contains a high-frequency generator 1, a frequency meter 2, a divider 3 frequencies, a modulator 4, an attenuator 5, a measuring quadrupole 6, a high-frequency amplifier 7, a high-frequency 8 and a low-frequency 9 phase detectors, a threshold element 10, a counter 11, a measuring electrode 12, lap 13, control object 14, grinding suspension 15, first 16 and second 17 resistors, sub-electrode area 18 and output terminal 19.

The first input of the detector 9 is connected to the output of the detector 8, the first input of which is connected to the output of the amplifier 7, the input of the quadrupole 6 is connected to the output of the generator 1, the second input of the detector 8 and the input of the frequency meter 2, the output of which is connected to the input of the divider 3, the output of which is connected to the input modulator 4, the first output of which is connected to the input of the attenuator 5, the output of which is connected to the input of the generator 1, the second output of the modulator 4 is connected to the second input of the detector 9, the installation input of the counter 11 is connected to the output of the threshold element 10, the input Secondly, it is connected to the detector output 9, the output of the counter 11 is connected to the output terminal 19, and the clock input is connected to the second output of the modulator 4. The first terminals of the resistors 16 and 17 are connected to the input of the quadrupole 6, the output of which is connected to the second terminal of the resistor 17 and the measuring electrode 12, mounted on priter, 13, and suspension 15 is placed between priter poles 13. It is possible to connect a direct divider 3 with an attenuator 5, a counter 11, a detector 9. The control part 14 is quartz crystalline elements.

The device works as follows.

The high frequency generator -1 generates a signal whose average frequency is measured by frequency meter 2, the reference frequency of frequency meter 2 is fed to frequency divider 3, where it is reduced to the value required for modulating high frequency oscillator 1. The output signal of frequency divider 3 synchronizes the modulator 4. From the output the modulator 4, the signal is fed to the attenuator 5, where its value is reduced to mourning, providing the necessary depth of modulation of the high-frequency signal. From the output of the high-frequency generator 1, the signal is fed to the input of the detector 8 and to the input of the detector 9 through the measuring quadrupole 6.

At the output of the detector 8, a low-frequency signal is produced corresponding to the slope of the frequency-frequency characteristics of the measuring quadrupole 6, and is fed to the input of the detector 9, to the other input of which the modulating signal is fed.

At the output of the detector 9, a signal is generated that is close to the logical 1, arriving at the threshold element

10. At the output of the threshold element 10 a logical 1 is formed, setting the counter 11 to the initial state and prohibiting its operation.

In this case, the signal to stop the machine is not generated, since the frequency of the quartz crystal elements 14 differs from the average frequency of the generator 1 and their polishing continues.

When the resonant frequencies of the control object 14 coincide with the average frequency of the generator 1, the output of the detector 9 produces a signal close to logical O, the output of the threshold element 10 produces a logical signal O which permits the operation of counter 11. With each pulse entering the counter

11, it changes its state and after a time determined by the division factor, a signal is generated to terminal 19, which is used to stop the grinding machine.

Formula inventions

Device to control the resonant frequency of quartz crystalline

elements containing a high-frequency generator, a frequency meter, a frequency divider, a modulator, an attenuator, a measuring quadrupole, a high-frequency amplifier, a high-frequency laser detector, a low-frequency basic detector, the first input of which is connected to the output of the high-frequency azov detector, the first input of which is connected with the output of the high-frequency amplifier, the input of which is connected to the output of the measuring quadrupole, the input of which is connected to the output of the high-frequency generator, the second input of the high-frequency The base detector and the input of the frequency meter, the output of which is connected to the input of a frequency divider, the output of which is connected to the input of the modulator, the first output of which is connected to the input of the attenuator, the output of which is connected to the input of the high-frequency generator, the second output of the modulator is connected to the second input of the low-frequency phase detector , characterized in that, in order to increase the reliability of monitoring results and expand functionality, a threshold element and a counter are introduced into it, the installation input of which is connected n yield threshold elemen5 one input of which is connected to the output of low frequency phase detector, a counter output is connected to an output terminal of the device, and a clock input - to a second output modulator.

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Claims (1)

Formula, invention A resonant frequency control device for quartz crystal elements, comprising a high-frequency generator, a frequency meter, a frequency divider, a modulator, an attenuator, a measuring four-terminal device, a high-frequency amplifier, a high-frequency phase detector, a low-frequency phase detector, the first input of which is connected to the output of the high-frequency phase detector, the first the input of which, θ, is connected to the output of the high-frequency amplifier, the input of which is connected to the output of the measuring four-port network, the input to which is connected to the output of the high-frequency generator, the second input of the high-frequency phase detector and the input of the frequency meter, the output of which is connected to the input of the frequency divider, the output of which is connected to the input of the modulator, the first output of which is connected to the input of the attenuator, the output of which is connected to the input of the high-frequency generator "second output of the modulator connected to the second input of the low-frequency phase detector, characterized in that, in order to increase the reliability of the monitoring results and expand the functional Tei, introduced into it and the counter threshold element, adjusting input of which is connected to the output of the threshold element having an input connected to the output of low frequency phase detector, a counter output is connected to an output terminal of the device, and a clock input to a second output modulator.