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Sending-receiving differential-type eddy current displacement detection device

A displacement detection, differential technology, applied in the direction of measuring devices, using electrical devices, using electromagnetic means, etc., to achieve the effects of suppressing gain drift and stray interference, improving accuracy, and improving selectivity

Pending Publication Date: 2019-03-15
SHIDAI IND AUTOMATION
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the above-mentioned technical problems existing in the existing eddy current displacement detection device, the present invention provides a transmission-reception differential eddy current displacement detection device with high accuracy and reliability

Method used

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  • Sending-receiving differential-type eddy current displacement detection device
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  • Sending-receiving differential-type eddy current displacement detection device

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Embodiment Construction

[0015] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0016] Such as Figures 1 to 5 As shown, a sending-receiving differential eddy current displacement detection device includes a sine wave generating circuit 1, an eddy current sensor probe 2, a band-pass filter 3, a low-pass filter 7 and L 2 C 2 Filter 9, inverting amplifier 4, non-inverting amplifier 5, integrator 6, voltage doubler rectification circuit 8, microprocessor 10, keyboard and display 11. The output terminal of the quartz crystal oscillator sine wave generating circuit 1 is externally connected to C 0 Sending coils connected in parallel W 0 18. Generate a sine wave excitation signal with constant frequency and constant amplitude. The manufacturing method of the sending-receiving coil: First, evenly wind the sending coil W on the non-magnetic skeleton 17 0 18, sending coil W 0 18 After winding, wrap a layer of insulating paper...

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Abstract

The invention discloses a sending-receiving differential-type eddy current displacement detection device. The device comprises a sine wave generation circuit, a sending-receiving differential-type sensing probe, a first filter, a feedback circuit, an inverting amplifier, a noninverting amplifier, a voltage doubling rectifying circuit, an LC filter, a microprocessor, a keyboard and a displayer. Thesine wave generation circuit, the sending-receiving differential-type sensing probe, the first filter, the inverting amplifier, the noninverting amplifier, the voltage doubling rectifying circuit, the LC filter and the microprocessor are connected in sequence, the output end of the feedback circuit is connected with the input end of the inverting amplifier, the input end of the feedback circuit is connected with the output end of the noninverting amplifier, and the keyboard is connected with the displayer and the microprocessor. According to the device, two grades of amplifiers are adopted for direct coupling, the depth negative feedback is achieved, the high gain is obtained, gain drift and stray interference are restrained, the selectivity of the amplifiers is improved by applying the band-pass filter, and the accuracy of displacement detection is improved.

Description

technical field [0001] The invention relates to a displacement detection device, in particular to a sending-receiving differential eddy current displacement detection device. Background technique [0002] Eddy current displacement detection is a non-destructive testing technology based on the principle of electromagnetic induction. Eddy current displacement detection devices are widely used in industrial automation, machinery manufacturing, aerospace and other fields. Eddy current sensors usually have impedance mode, bridge mode, sending-receiving mode, etc. There are often many interference signals in the weak displacement eddy current detection signal, such as common mode interference, interference caused by temperature drift, DC level shift during amplification, etc. All kinds of interference, the interference signal in the eddy current detection signal must be suppressed to the allowable range in order to effectively identify useful displacement information. Existing ed...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B7/02
CPCG01B7/023
Inventor 段鑫蒋湘君罗海波吴国良黄运生
Owner SHIDAI IND AUTOMATION
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