SU1381344A1 - Extreme temperature sensitive element - Google Patents

Abstract

The invention relates to a control and measuring technique. The purpose of the invention is to expand the range of recorded temperatures and improve measurement accuracy. The choice of the extreme temperature value is made by setting the corresponding operating point on the current-voltage characteristic of the tunnel diode 3 with the help of the source 5 control and its voltage. 2 Il.

Description

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j The invention relates to a measurement and measurement technique, in particular, contact thermometry devices for con-: extreme temperature control. : The purpose of the invention is the expansion of the range of recorded temperatures and elevations; measurement accuracy. : FIG. 1 shows the structural scheme of the sensor of extreme temperatures; in fig. 2 - volt-ampere characteristic of a tunnel diode.

The sensor of extreme temperatures contains a generator of microwave oscillations 1 thermosensitive microwave transistor 2, tunnel diode 3, choke 4, source 5

2

The stepwise displacement of the operating point of the tunnel diode 3 () due to further change (increase) of the voltage in the base circuit of the thermosensitive microwave transistor 2.

The result of this interchange of the working point is an abrupt change (the inductive nature of the reactive component of the input impedance of the temperature-sensitive microwave transistor 2 begins to predominate) of the sensor circuit impedance, which ultimately leads to a change (negative to positive) sign of the phase shift and changing (decreasing) the amplifying voltage, capacitor 6. tons of microwave oscillations at the output. The reverse device works as follows. a change (decrease) in the temperature of the call At the initial moment of time, at the output of the microwave oscillator 1, there are oscillations whose frequency is chosen so that the reactive component of the total input resistance is temperature sensitive to the back reaction at the output, i.e. change (positive to negative ) the sign of the phase shift and the change (increase) in the amplitude of the microwave oscillations up to 20 initial values.

a powerful microwave transistor 2 was inductive. Thus, the choice of the extrective value (which corresponds to the positive (minimum or maximum) positive phase shift). The temperature is set by

The source 5 of the control voltage of the corresponding operating point on the volt- sets a certain position to the ampere characteristic of the tunnel diode

the operating point of the tunnel diode 3 volts

ampere characteristic (for example, A), which corresponds to a certain lead: the rank of impedance (active and

I reactive components) tunnel diode: yes 3, and the reactive component has

1 capacitive in nature (negative phase shift) at the oscillation frequency of the microwave oscillator 1.

; At the output of the device are observed

; Microwave oscillations of a certain amplitude,

I out of phase with respect to oscillations

microwave oscillator 1 by a certain amount, and due to the pre: possession of the capacitive nature of the reactive component of the impedance of the tunnel diode 3, the phase shift is negative. Change (increase) of temperature 40 choke, source of control voltage; causes a change (increase) in voltage and a capacitor, and the first conclusion is z: neither in the base circuit of the heat-sensitive

: Microwave transistor 2 (Fig. 2.) due to a change (increase) in the reverse current

emitter-base transition microwave transistor45

3 by means of a control voltage source 5, the example given (Fig. 2, point A) corresponds to the maximum temperature sensor, and for the minimum temperature sensor, another operating point should be set (for example, B Fig. 2), the device with This works in a similar way.

Claims (1)

Invention Formula An extreme temperature sensor, comprising an oscillator and a tunnel diode, characterized in that, in order to expand the range of detected temperatures and improve accuracy, a temperature-sensitive microwave transistor is introduced into it, Step 1, resulting in the displacement (Fig. 2) of the operating point on the current-voltage characteristic of the tunnel diode 3. When the temperature reaches a predetermined value (fig.2, point A), the device is in a state of unstable equilibrium. Any subsequent change (increase) in call temperature50 oscillation oscillator, made in the form of a microwave oscillation generator, is connected to the emitter of a heat-sensitive microwave transistor whose base is connected to the first output of the throttle and the anode of the tunnel diode, the cathode of which is connected to the second output of the microwave oscillation generator and the negative pole of the control voltage source, positive the pole of which is connected to the second output of the throttles, and the collector of the microwave transistor is connected to the first output of the capacitor. 2 The stepwise displacement of the operating point of the tunnel diode 3 () due to further change (increase) of the voltage in the base circuit of the thermosensitive microwave transistor 2. The result of this interchange of the working point is an abrupt change (the inductive nature of the reactive component of the input impedance of the temperature-sensitive microwave transistor 2 begins to predominate) of the sensor circuit impedance, which ultimately leads to a change (negative to positive) sign of the phase shift and a change (decrease) in the amplitude of the microwave oscillations at the output. Reverse change (decrease) in temperature caused by   A lot of microwave oscillations at the output. Reverse change (decrease) in temperature caused by the opposite reaction at the output, that is, the change (positive to negative) sign of the phase shift and the change (increase) in the amplitude of microwave oscillations up to 20 initial values. the corresponding operating point on the current-voltage characteristic of a tunnel diode 3 by means of a control voltage source 5, the example given (Fig. 2, point A) corresponds to the maximum temperature sensor, and for the minimum temperature sensor, another operating point should be set (for example, B Fig. 2), the device with This works in a similar way. Invention Formula a choke, a control voltage source of an extreme temperature sensor, containing an oscillator and a tunnel diode, characterized in that, in order to expand the range of detected temperatures and increase accuracy, a thermosensitive microwave transistor is inserted into it, 45 50 oscillation oscillator, made in the form of a microwave oscillation generator, is connected to the emitter of a heat-sensitive microwave transistor whose base is connected to the first output of the throttle and the anode of the tunnel diode, the cathode of which is connected to the second output of the microwave oscillation generator and the negative pole of the control voltage source, positive the pole of which is connected to the second output of the throttles, and the collector of the microwave transistor is connected to the first output of the capacitor. Ui ui and 2