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Aviation-specific displacement sensor measuring method

A technology of displacement sensor and measurement method, which is applied in the field of sensors, and can solve problems such as poor measurement stability, susceptibility to external electromagnetic interference, and poor real-time performance

Active Publication Date: 2012-08-01
西安润鑫航空科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method has poor measurement stability, is susceptible to external electromagnetic interference, and has poor real-time performance.

Method used

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  • Aviation-specific displacement sensor measuring method
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  • Aviation-specific displacement sensor measuring method

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Embodiment Construction

[0075] The present invention is described in further detail below in conjunction with accompanying drawing:

[0076] The internal circuit structure of the sensor involved in the present invention is simple, and is only wound by a group of metal coils. Such as figure 1 As shown, its equivalent circuit model is composed of the internal resistance r in the inductor coil and the inductance L connected in series (the parasitic capacitance can be ignored). Among them, the internal resistance r changes with the ambient temperature; the inductance L is related to the proximity of the metal target near the sensor. If there is a metal target outside the sensor, the electromagnetic field distribution in the vicinity changes significantly, and the equivalent inductance of the sensor increases. By driving and detecting the inductance value, it can be judged whether there is a metal target approaching outside.

[0077] Taking the sensor products of Crouzet Company as an example, the induc...

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Abstract

The invention discloses an aviation-specific displacement sensor measuring method, which includes the following steps: (1) establishing a measurement circuit with a magnetic induction sensor composed of an internal resistor r and an inductor L; (2) establishing a lookup table, and using an ADC (analog-to-digital converter) for measuring inductor discharge voltage values U1 and U2 corresponding to two fixed delay times T1 and T2 respectively to acquire discharge voltage equations of the r-L circuit: U1 (T1, R, r, L) and U2 (T2, R, r, L); (3) compressing the lookup table, and measuring a displacement sensor according to the compressed lookup table . The aviation-specific displacement sensor measuring method has the advantages that the system can work in the army standard temperature ranges, the stability, the reliability and the real-time of the system measurement can be improved, no floating point arithmetic is required, and the CPU (central processing unit) or MCU (microprogrammed control unit) hardware resources are omitted.

Description

Technical field: [0001] The invention belongs to the field of sensors, and relates to a driving and detecting method of a passive sensor, in particular to a driving and detecting method of a passive inductive non-contact displacement sensor (Aerospace Inductive Proximity Sensors) in the aviation field, and the use of a look-up table The optimization method for calculating the inductance value is especially suitable for the look-up table compression of the charge-discharge curve of the r-L circuit for sampling calculation by the look-up table method. Background technique: [0002] Since non-contact displacement sensors have higher reliability and MTBF (mean hours between failures) than mechanical displacement switches, they are increasingly used in electromechanical systems in the aviation field. Including landing gear, passenger and cargo doors, ailerons, thrust reversers, etc. of various aircraft. The types of aircraft involved include large civil aviation passenger planes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B7/02
Inventor 邵志标郭一欣
Owner 西安润鑫航空科技有限公司