SU1241156A1 - Device for automatic monitoring ofs of dielectrics rmittivity - Google Patents

Abstract

This invention relates to an automaton; devices for controlling the rate of change of dielectric constant. The purpose of the invention — by control — is achieved by increasing the noise immunity of the device. For this purpose, comparison units 8 and 12 are additionally introduced to the device, a program-specifying unit 9, a key 10, a counter 11, an information reading unit 13, a driver of control actions 14, a control unit 15, In addition, the device contains resonators 1 and 2 , oscillators 3 and 4, mixer 5, converter 6, the rate of change of the output frequency of the mixer into a digital code and frequency divider 7. The device can be operated in two modes: manual and automatic. In the first case, the measurement is carried out within one cycle, determined by the measurement time interval. In the second after the end of the first measurement time cycle, the next re-start is performed. This increases the noise immunity of the 1I counter and the reliability of the control being carried out. (Lu 41 js about

Description

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The invention relates to automatics and measurement technology, in particular to automatic devices for controlling the rate of change of dielectric constant.

The purpose of the invention is to increase the reliability of the results of controlling the rate of change of dielectric constant.

The drawing shows the structure is not. diagram of the device for automatic control of sorrow changes in dielectric constant.

The device contains resonators 1 and 2, ZIL autogenerators, mixer 5, converter 6 for changing the output frequency of the mixer, into a digital code, frequency divider 7, the first block 8 comparing codes j. the software block 9, the key 10, the counter 11, the second block 12-comparison of codes, the block 13 to read the information shaper the control action 14 and the control block 15.

Resonator 1 is sensitive to changes in the niches of the measured dielectric constant and is connected to the self-oscillator 3, resonator 2 is the reference one and connected to the auto-oscillator 4, the outputs of the auto-oscillators 3 and 4 are connected to the inputs of the mixer 5, the output of which is connected to the input of the converter 6 for changing the output frequency of the mixer to a digital code, a frequency divider 7 connected by the input to the output of the autoheater & ra 4, and the output to the control input of the converter 6, the output of which is connected to one of the inputs of the first block 8 of the code comparison, the other input d of which is connected to the first output of the program-setting unit 9 .. The output of the first block 8 of the comparison code is connected to one of the inputs of the control unit 15 simultaneously connected to the control

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the input of the key 10, the signal input of which is connected to the output of the frequency divider 7, connected to another input of the control unit 15. The output of the key 10 is connected to the input of the counter 11 pulses, the output of which is connected to

one of the inputs of the second block 12 of the code comparison, the other input of which is connected to the second output of the programming unit 9. The output of the B-speed converter changes the output frequency of the mixer into a digital code connected to the information input of the information reading block 13

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Equal input of which is combined with the input of driver control action 14 on the actuating element and connected to the output of the second code comparison unit I2. The reset bus of the pulse counter 11 is connected to the output of the control unit 15.

The device for automatic control of the rate of change of dielectric constant works as follows.

At the initial time, the control unit 15 over the OUTCUT generates a pulse to the reset bus of the counter 11, ensuring that it is reset.

Prior to the beginning of the measurement, the code setting unit 9, representing a set of toggle registers, enters the code value of the first installation N, proportional to the set level of the dielectric constant change rate o, and the second setpoint tfi, which is N rTg / Vnq ,. where T is the allowable interval during which it is possible to transform the monitored parameter with the value of the first setting N, defined as (K is the coefficient of proportionality); t is the duration of the reference frequency period fj; By - the division factor of the divider 7.

In accordance with the change in the dielectric constant of E. A corresponding change is made in the parameters of the sensitive resonator 1, which leads to frequency tuning of the oscillator 3. At the output of the mixer .5, a difference frequency signal 4f fK-f2 is obtained: where Gu is the frequency of the autogenerator 3 with a sensitive resonator ; fg. frequency oscillator 4 with a reference resonator.

Since the frequency deviation f and f from the temperature change may be the same (resonators are identical and located in the thermostat), the temperature effect in the differential sensor switching circuit can be neglected and the differential-frequency signal is proportional to the change in the dielectric constant. . Next, the frequency signal from the output of the mixer 5 is fed to the input of the rate converter for changing the output frequency of the mixer to a digital code, to the control input

which receives a clock frequency signal from the output of the autogenerator 4. after the corresponding division in divider 7, i.e. GE / P1, where pa is the division factor of the divisor 7..

Let at time t / (the current value of the dielectric constant change rate is such that the code value at the output of converter 6 exceeds the code value of the first setpoint N, j. In this case, the output of the first block 8 of code comparison appears signal 1, which control input key 10, providing passage through the key 10 clock pulses to the input of the counter II pulses. In the case when the number of pulses in the counter I1. You are such that the inequality from the output of the second block 12 comparison of codes to one of the inputsthe set value N2 is supplied to it, and on another text the value of the N code from the output of the counter 1 I, at the moment + Tc |, the signal 1 is taken, which is fed to the input of the control actions generator 14 for appropriate manipulations, and to the control input of the information reading unit 13, providing reading of the code values from the output of the converter 6 to the computer input

The device can operate in two modes: manual and automatic.

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In the first case, the measurement is carried out within one cycle, determined by the measurement time interval. In the second case, after the end of the first time cycle of measurement, the next restart is performed. This allows to increase the noise immunity of the operation of the counter 11 and to ensure the reliability of the monitoring performed.

Claims (1)

Invention Formula A device for automatically controlling the dielectric constant change rate, containing an oscillator with a sensitive resonator, an oscillator with a reference resonator, a mixer, the inputs of which are connected to the oscillator outputs, and the mixer output is connected to the input of the mixer into the digital code, frequency divider, the input connected to the output of the oscillator with a reference resonator, and the output is connected to the control input of the converter of the rate of change of the output frequency of the mixer in a digital xsd, characterized in that, in order to increase the reliability of the control results, two codes are entered in the neg, a key, a pulse counter, an information reading unit, a program driver unit, an actuator controlling actuators, a control unit The output of the converter for changing the output frequency of the mixer to a digital code is connected to one of the inputs of the first comparator unit, the codes whose other input is connected to the first output. The output of the first Kodo comparison unit is connected to one of the inputs of the control unit and the control input of the key, the signal input of which is connected to the output of a frequency divider connected to another input of the control unit and the output of the key is connected to the input of a pulse counter, the reset bus of which is connected to the output the control unit and the output of the pulse counter is connected to one of the inputs of the second block: code comparison, the other input of which is connected to the second output of the software master block, and the output of the rate converter in The output frequency of the mixer. The digital code is connected to the information input of the information reading unit, the control input of which is combined with the input of the driver of control actions on the actuating element and connected to the output of the second code comparison unit, ...