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Dynamic response time testing method for linear differential transformer type displacement sensor

A differential transformer type, displacement sensor technology, used in instruments, measuring devices, electrical devices, etc., to achieve the effect of improving measurement accuracy

Active Publication Date: 2021-11-02
SHENYANG ACAD OF INSTR SCI
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Problems solved by technology

Since the actual moving time of the detection rod is difficult to make very accurate calculations, the measurement accuracy of the spring acceleration test method can generally be controlled within 1.5ms, and it can only be used for dynamic performance tests of displacement sensors whose response time does not exceed 5ms

Method used

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  • Dynamic response time testing method for linear differential transformer type displacement sensor
  • Dynamic response time testing method for linear differential transformer type displacement sensor
  • Dynamic response time testing method for linear differential transformer type displacement sensor

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specific Embodiment 1

[0029] DETAILED DESCRIPTION OF THE INV:: The zero point position 4 moves to the full-scale position 5, saves the mechanical movement of the tie rod.

[0030] Example in the transient signal motion signal excitation test method: Differential transformer displacement sensor is made of electromagnetic induction principle, such as image 3 As shown, when an AC excitation signal is applied to the primary coil (excitation coil) of the transformer, an alternating magnetic flux is generated. The alternating magnetic universal φ is indicated, the φ in the secondary coil is the same. It can be seen that the induced electromotive force in the primary and secondary coils is e. 1 = -N 1 Dφ / dt, e 2 = -N 2 Dφ / dt. N 1 , N 2 For the original, the number of the number of secondary coils, U 1 = -E 1 U 2 = E 2 (U 1 True value for primary coil voltage, u 2 For the secondary coil voltage effective value). Let K = N 1 / N 2 , K is called a transformer ratio. Used by the above formula U 1 / U 2 = -N 1...

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Abstract

The invention relates to response time testing, in particular to a dynamic response time testing method for a linear differential transformer type displacement sensor. The invention provides a novel response time measurement method, namely an excitation coil instantaneous signal excitation test method, so that the measurement accuracy of the response time is effectively improved. The method comprises the following steps: 1, placing a detection pull rod of a linear differential transformer type displacement sensor at a full-scale position; 2, applying an instantaneous excitation signal to a primary coil of the sensor; 3, meanwhile, monitoring the change of the output signal of the sensor from the zero point to the full scale by using a storable oscilloscope; and 4, at the moment when the output signal reaches the full-scale signal amplitude, enabling the time length where the moment lags behind the starting moment of the instantaneous excitation signal to be the response time of the displacement sensor.

Description

Technical field [0001] The present invention relates to a response time test, and more particularly to a dynamic response time test method of a linear differential transformer displacement sensor. Background technique [0002] With the growing development of displacement sensor applications, the requirements for dynamic characteristics such as sensor output response time are also increasing; for linear differential transformer displacement sensors, the sensor measurement accuracy, environmental adaptability and other indicators are directly related to Sensor's working performance. The response time of the linear displacement sensor is the time required for the signal output of the sensor to detect the rod displacement to detect the rod displacement. As an important dynamic characteristic index of the sensor, it is actually one of the most important parameters that the sensor is the most important parameter of the change in synchronization of the measured displacement. It is neces...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B7/02
CPCG01B7/02Y02E30/30
Inventor 李永清彭春文徐丹辉申安安张建芦越栋羿丽红高跃李广恒梁永胜李慧王静纪晓雪滕宏达于程程赵雪
Owner SHENYANG ACAD OF INSTR SCI
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