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Sensor environment temperature measuring circuit and sensor

A technology of ambient temperature and measurement circuit, applied in the field of sensors, can solve problems such as poor precision and complex system, and achieve the effects of improved precision, accurate temperature measurement and compact structure

Pending Publication Date: 2022-03-01
安徽见行科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problems of poor precision and complex system existing in the prior art, the present invention provides a sensor ambient temperature measurement circuit and sensor, which has a high degree of integration, compact structure, can accurately reflect the temperature at the measurement point, and has better compensation Effect

Method used

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Examples

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Effect test

Embodiment 1

[0039] like Figure 4As shown, this embodiment is an application of the present invention to a single-probe eddy current sensor. The displacement measurement circuit is composed of excitation source V1, detection bridge and demodulation circuit. The AC excitation voltage V1 is divided between R1 and the probe. The amplitude and phase of the AC voltage change with the distance between the probe and the target board. Displacement information can be obtained by processing the voltage. Use an operational amplifier to add a DC bias V2 at the excitation terminal. The DC bias circuit is an addition circuit composed of a DC voltage source or an operational amplifier directly connected in series with the AC excitation source. The DC voltage is superimposed on the AC voltage. The addition circuit is conventional. Technology, I won’t go into details here, as long as it is guaranteed, the DC voltage can be superimposed on the AC voltage. The DC voltage is divided on the resistance R1 of ...

Embodiment 2

[0042] Such as Figure 5 As shown, this embodiment is the application of the present invention on the differential eddy current sensor. The measurement circuit is composed of excitation source V1, detection bridge, and demodulation circuit. The AC excitation voltage V1 is divided on R1 and probe 1, and at the same time, it is divided on R3 and probe 2. The amplitude and phase of the two voltages follow the probe. The distance from the target board changes, and the displacement information can be obtained by making a difference between the two and demodulating. A DC bias V2 is added at the excitation end, and the DC voltage is divided on the resistance R1 of the bridge and the DC resistance of the probe 1, and then amplified after low-pass filtering to obtain a voltage reflecting the temperature of the probe. R1 and R3 use low-temperature drift resistors, and the low-temperature drift coefficient can avoid the temperature drift at the conditioning circuit from affecting the te...

Embodiment 3

[0044] This embodiment is an application of the present invention to a differential transformer sensor. In this embodiment, the exciting coil of the differential transformer sensor is used as the temperature measuring element. Add a DC bias V2 and a voltage divider resistor R1 at the excitation end. The DC voltage is divided on the resistor R1 and the DC resistance of the probe excitation coil, amplified after low-pass filtering, and a voltage reflecting the temperature of the probe is obtained. Among them, R1 should use a low-temperature drift resistor to avoid the temperature drift at the conditioning circuit from affecting the temperature measurement of the probe; the input impedance of the filter should be much larger than the probe impedance, so as to avoid the impact of shunt on displacement measurement.

[0045] The compensation methods of the above-mentioned sensors are only some of them, and the other types are only the compensation of inductive sensors. All can be i...

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Abstract

The invention discloses a sensor environment temperature measuring circuit and a sensor, and belongs to the technical field of sensors. In order to solve the problems of poor precision and complex system in the prior art, the invention provides a sensor environment temperature measuring circuit and a sensor, the sensor environment temperature measuring circuit comprises a loop formed by a probe and an excitation source, and also comprises a direct current bias circuit and a divider resistor, and the direct current bias circuit and the divider resistor are superposed or externally added on the loop formed by the probe and the excitation source; and the compensation loop comprises a low-pass filter circuit, an amplification circuit, a compensation circuit and a demodulation circuit which are arranged in sequence to form the compensation loop, and the compensation loop is arranged between the probe and the divider resistor for voltage compensation. The circuit and the sensor are high in integration degree and compact in structure, can accurately reflect the temperature at a measurement point, and have a better compensation effect.

Description

technical field [0001] The invention relates to the technical field of sensors, and more specifically, to a sensor environment temperature measurement circuit and a sensor. Background technique [0002] Inductive sensor is a widely used sensor, which can be used to measure vibration, displacement, thickness, angle, etc. According to the structure of the sensor probe, it can be divided into self-inductive sensor, differential transformer sensor and eddy current sensor. The self-inductance sensor uses a coil as a probe. The probe is designed so that the inductance changes with changes in other physical quantities. The coil is excited by high-frequency alternating current to detect changes in other physical quantities by detecting changes in the inductance of the coil. The differential transformer sensor uses an excitation coil and two secondary coils in reverse series as a probe. When the distance between the excitation coil and the two secondary coils changes, the voltage ind...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01K7/16G01K1/20
CPCG01K7/16G01K1/20
Inventor 李明夏曹龙轩赵国锋李伟
Owner 安徽见行科技有限公司
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