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Detection method for automatically calibrating inductive displacement sensor

A displacement sensor and automatic calibration technology, which is applied in the field of sensor detection, can solve problems such as the inability to accurately isolate inductive displacement sensors and detection circuit faults, and achieve low-cost and high-efficiency maintenance, improve measurement accuracy, and improve detection reliability.

Pending Publication Date: 2022-07-15
贵州新安航空机械有限责任公司
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Problems solved by technology

[0007] In order to solve the above-mentioned technical problems, the present invention provides an automatic calibration inductance displacement sensor detection circuit and its detection method. By building a simple circuit, designing a reasonable signal extraction and calibration method, and implementing a calibration step before measurement, the accuracy of the detection circuit is improved. , and effectively solve the problem that the current detection technology cannot accurately isolate the fault of the inductive displacement sensor and the detection circuit

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  • Detection method for automatically calibrating inductive displacement sensor
  • Detection method for automatically calibrating inductive displacement sensor
  • Detection method for automatically calibrating inductive displacement sensor

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Embodiment Construction

[0040] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0041] see Figure 1-7 , a simple way to achieve calibration such as figure 1 As shown in the figure, a switch SW is inserted into the loop, the on-resistance of this switch is rw when it is turned on, and the on-resistance of the two groups of three contacts is dispersed. figure 2 The dispersion characteristics of the on-resistance of the commonly used analog switches are shown, image 3 The temperature characteristics of the on-resistance of common models of analog switches are shown. from figure 2 and image 3 It can be seen that the on-resistance of the analog switch varies greatly between channels, chips, and when the temperature changes. The on-resistance characteristics...

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Abstract

The invention relates to a sensor detection technology, and discloses a detection method for automatically calibrating an inductive displacement sensor, which comprises an inductive displacement sensor to be detected, a built-in coil of the inductive displacement sensor is equivalent to an internal resistor rc and an inductor L which are connected in series, and differential voltages at two ends of a sampling resistor and a standard resistor are measured through a detection circuit; the control and operation unit is used for sampling the differential voltage at the two ends of the sampling resistor and the standard resistor, the control and operation unit is used for operating the sampled voltage and obtaining the calculated value of the standard resistor, and the calculated value is compared with the rated value of the standard resistor through the control and operation unit to obtain the gain coefficient Ks of the measuring loop; and then replacing a standard resistor with the inductive displacement sensor, sampling the sampling resistor and the differential voltage at the two ends of the inductive displacement sensor by the control and operation unit, and calibrating according to the gain coefficient Ks to obtain the impedance of the inductive displacement sensor.

Description

technical field [0001] The invention relates to a sensor detection technology, in particular to an automatic calibration inductance displacement sensor detection method. Background technique [0002] The inductive displacement sensor is realized by sealing an inductive coil in an all-metal casing. A measurement circuit is built to apply a periodic excitation signal to the inductive displacement sensor, and the sensor emits an electric field or a magnetic field. When the displacement of the detected target changes, the change of the electric field or magnetic field pair will cause the impedance of the sensor itself to change. This change will affect the excitation signal applied to the sensor by the measurement circuit. The measurement circuit demodulates the change of the excitation signal to obtain the impedance value of the inductive displacement sensor, which is used to determine the target displacement state and realize displacement detection. [0003] Because the induc...

Claims

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Application Information

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IPC IPC(8): G01B7/02
CPCG01B7/02
Inventor 张远
Owner 贵州新安航空机械有限责任公司
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