SU1525479A1 - Device for measuring temperature - Google Patents

Abstract

The invention relates to a measurement technique and can be used in the geophysical study of wells, remote measurement of gas temperature at gas distribution and gas filling stations, as well as at other explosive objects. The control signal generator 1, acting on the control input of the control generator 2, changes its output frequency. The output signal of the controlled oscillator 1 through a wired channel 9 through bi-directional coupler 5 and transformer 7 goes to a quartz resonator 8. When the frequency of the controlled oscillator signal and the serial resonance frequency of the quartz resonator 8 coincides, the phase shift of the forward and reverse waves at the outputs of the bi-directional coupler will change by 180 °, which will cause an abrupt change in the signal at the output of the phase detector 6 and the operation of the voltage comparator 3. The output signal of comparator 3 acts on the control input of generator 1, stopping the change in the frequency of controlled generator 2, and enables the counting mode of computing unit 4, which converts the value of frequency of controlled generator 2 into the measured temperature value. Subsequently, the multivibrator, included in the control signal generator, resets the control signal and the measurement cycle repeats. 1 il.

Description

The invention relates to measuring equipment and can be used for remote measurements of t <a-pattern in wells, on technological lines of gas fields, on gas pipelines, including gas distribution and gas stations, as well as other explosive objects.

The purpose of the invention is to improve the accuracy of measurement when remotely measuring the temperature of explosive objects.

The drawing shows a block diagram of a device for measuring temperature!,!.

The device L.! 1 1 temperature measurement contains a control signal generator 1, a controlled generator 2 voltage comparator 3, a computing unit 4, a bi-directional coupler 5, a phase 6 detector, a transformer 7, a quartz thermosensitive resonator 8, a wired channel 9 in the form of an extended communication line. The composition of the control signal generator 1 includes a reference voltage source 10, a multivibrator 11, first 12 and second 13 keys, a current stabilizer 14 and a storage capacitor 15.

The device operates as follows.

In the initial state, the first key 12 is open, and the second key 13 is closed. The current from the reference voltage source 10 through the open first switch 12 and the current stabilizer 14 charges the storage capacitor 15, and the voltage thereon rises according to a law close to linear. This voltage, supplied to the control input of the controlled generator 2, causes an increase in the frequency of the voltage generated by it. This voltage is through bidirectional. 5, the coupler through the wire channel 9 is fed to the primary winding of the transformer 7, the resonator 8 is connected to the secondary boost winding of it. At a frequency of the controlled generator 2 below the frequency of the series resonance of the resonator 8, the wire channel 9 operates in idle mode, since the resistance of the resonator 8 is much greater the wave resistance of the wire channel 9. In this case, the phase shift of the oscillations of the forward and backward waves at the corresponding outputs of the two-directional coupler 5 is equal to If the frequency of the controlled oscillator 2 with a frequency of sequential resonance of the resonator 8, the resistance of this resonator, transformed to the output of the line of the wire channel 9, will become much less than the wave resistance of the wire channel 9. In this case, the wire channel 9 will work in the short circuit mode and the phase difference of the forward and backward waves will be equal to 180. This will lead to a change in the polarity of the voltage at the output of the phase detector 6 and the trip of the voltage comparator 3. The output voltage of the voltage comparator 3 will close the first switch 12 and thereby stop changing the frequency of the controlled oscillator 2. At the same time, the output voltage of the voltage comparator 3 starts the computing unit 4, in which the information about the frequency of the controlled 2 generator (frequency of the resonant resonant resonator 8) is converted into information about the measured temperature according to the calibration table of the quartz thermosensitive resonator 8.

The multivibrator 11, periodically discharging the storage capacitor 15 through the second key 13, repeats the temperature measurement process.

So, when using a RK 1I2 MA type resonator as a SE with a sequential resonance frequency (at t = 20 ° C) ~ 5 · 1 ⁶ Hz, the rate of change of the output frequency of the controlled oscillator 2 should be no more than 10 kHz / s. The period of oscillation of the symmetric multivibrator 1 1 should be at least 10 s (for opening the range - 100 - + 150 ° С) It should be noted that it is the multivibrator that organizes the measurement cycle in time. Tai, when the second key 13 is closed, the frequency of the controlled oscillator 2 is unchanged and obviously lower than the frequency of the series resonance of the quartz thermosensitive resonator 8, at the output of the phase detector 6, the signal is proportional to the phase shift at its inputs, the voltage comparator 3 is in the initial state (the first switch 12 is closed, and the mode accounts in special healer 4 blocked). On the

I 525479 in the next half-cycle of the multivibrator signal 11, the second key 13, opening, provides a condition for charging the storage capacitor 15, increasing the control voltage on it and cleaning the frequency of the signal of the controlled oscillator 2. At the moment the latter reaches the frequency of the series resonance of the resonator 8, an abrupt change occurs, the phase difference signals at the inputs of the phase 6 detector and an abrupt change in its output voltage, which causes the voltage comparator 3 to trip. The comparator 3 with its output voltage opens the first switch 12 and enables the counting mode of the computing unit 4, which recalculates the fixed value of the frequency of the controlled generator 2 to the measured temperature. This mode will be maintained until the next half-wave of the output signal of the multivibrator 11 closes the second key 13 and during the discharge of the storage capacitor 15 the frequency (controlled by 2 generators, and with it the phase 6 detector and voltage comparator 3, will return to the initial state. Cycle measurement is repeated.

Claims (1)

Claim . A device for measuring temperature, containing a quartz thermosensitive resonator, a wired channel in the form of an extended communication line, a controlled generator and a numeral block, characterized in that, in order to increase the accuracy when remotely measuring the temperature of explosive objects, a bidirectional coupler, phase detector, are harmful a voltage comparator, a control signal generator and a transformer, in the secondary raising winding of which a quartz thermosensitive resonator is included, and the primary winding of this transformer is connected to a wire channel connected to the output of the controlled generator ¹ through a bi-directional coupler, the forward and backward wave outputs of which are connected to the inputs of a phase detector, the output of which is connected to the signal input of the voltage comparator, the reference input of which is connected to a common bus, and the output is connected with the input of the control signal generator and the control input of the special calculator of the computing unit, whose information input is connected. I dinen with the output of a controlled generator, the control input of which is connected to the output of the generator of the control signal.