Method for judging loading phase of flexible pressure sensitive coil

A coil and flexible technology, applied in the field of sensors, can solve the problems of the adverse effects of pressure and non-contact displacement measurement, the drift of critical impedance, and the difficulty of flexible pressure-sensitive coils in the load stage.

Inactive Publication Date: 2019-02-15
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the structure of the conductive network inside the flexible varistor coil under zero pressure will change after long-term use, which will cause the critical impedance to drift,

Method used

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  • Method for judging loading phase of flexible pressure sensitive coil

Examples

Experimental program
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Effect test

Embodiment

[0014] Connect the AC signal source to the first input port (pin 13) of the multiplexer MAX4617, and connect the DC signal source to the second input port (pin 14) of the multiplexer MAX4617 ); connect the output port (the third pin) of the multiplexer MAX4617 to the inverting terminal of the operational amplifier through an adjustable impedance; connect the flexible pressure-sensitive coil and another adjustable impedance in series and place it in the operation Between the inverting terminal and the output terminal of the amplifier; convert the output signal of the operational amplifier into a digital signal through an analog-to-digital converter; input the digital signal output from the analog-to-digital converter to the microprocessor; connect the output signal line of the microprocessor Connected to the enable terminal (pin No. 6) and logic control terminal (pin No. 9, 10 and 11) of the multiplexer to control the AC signal source and the DC signal source to pass through the...

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Abstract

The invention relates to a method for judging the loading phase of a flexible pressure sensitive coil, which belongs to the technical filed of measuring. The method comprises the following steps: using a multiplexer to access an AC signal source and a DC signal source into a measurement circuit of the flexible pressure sensitive coil with time-division, so that a microprocessor can collect an AC response and a DC response of the flexible pressure sensitive coil with time-division. If there has a DC response, it indicates that the flexible pressure sensitive coil is in a contact phase, and thencompleting a pressure measurement by calibration data and a conversion algorithm of the AC response and the contact phase; if there has no DC response, it indicates that the flexible pressure sensitive coil is in a non-contact phase, and then completing a non-contact displacement measurement by calibration data and the conversion algorithm of the AC response and the non-contact phase. The methodfor judging the loading phase of the flexible pressure sensitive coil can prevent the judgment of the load phase of the flexible pressure sensitive coil from an adverse effect of a critical impedancedrift, and is particularly suitable for the field of narrow inter-layer pressure and non-contact displacement measurement of modern large industrial equipment.

Description

technical field [0001] The invention belongs to the technical field of sensors, in particular to flexible sensors and non-contact displacement measurement. Background technique [0002] The flexible pressure-sensitive coil is a new type of sensor that can solve the problems of interlayer pressure and non-contact displacement measurement on narrow curved surfaces of modern large-scale equipment. In the prior art, during the calibration process, the critical impedance of the flexible pressure-sensitive coil from the non-contact stage to the contact stage is obtained first, and then the calibration data of the contact stage and the non-contact stage are obtained and the corresponding conversion algorithm is designed; in the measurement process, first By comparing the impedance of the flexible pressure-sensitive coil with the critical impedance, the loading stage of the flexible pressure-sensitive coil is judged (ie: judging whether the flexible pressure-sensitive coil is in the...

Claims

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Application Information

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IPC IPC(8): G01D5/12G01D5/165G01D5/16
CPCG01D5/12G01D5/16G01D5/165
Inventor 王璐珩
Owner CENT SOUTH UNIV
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