Method for measuring pressure and non-contact displacement by using flexible pressure sensitive coil

A non-contact and flexible technology, applied in the field of sensors, can solve problems such as large repeatability errors, achieve stable response and improve repeatability

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

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Problems solved by technology

However, the conductive network structure inside the flexible pressure sensitive coil is different under different loading and unloading cycles, which leads to large repeatability errors, and the whole measurement involves two physical processes, the contact stage and the non-contact stage

Method used

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  • Method for measuring pressure and non-contact displacement by using flexible pressure sensitive coil

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Experimental program
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Embodiment

[0016] (1) Before calibration, apply a pressure of 3MPa to the flexible pressure-sensitive coil with a range of 1MPa and maintain it for 2 hours before unloading to 0MPa. Then, repeat the following loading and unloading cycle for the flexible pressure-sensitive coil 30 times: from 0MPa to 1MPa Then unload to 0MPa; connect the two ends of the flexible pressure-sensitive coil to the output terminal and the reverse terminal of the operational amplifier, connect the output terminal of the operational amplifier to the input terminal of the analog-to-digital conversion module, and connect the output of the analog-to-digital conversion module to the flexible pressure-sensitive The digital quantity corresponding to the coil impedance is connected to the microprocessor;

[0017](2), in the calibration stage, obtain the impedance value at the transition point of the flexible pressure sensitive coil from the non-contact stage to the contact stage as the critical impedance, and then obtain...

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Abstract

The invention relates to a method for measuring pressure and non-contact displacement by using a flexible pressure sensitive coil, which belongs to the technical filed of measuring. The method comprises the following steps: before calibrating, applying a heavy pressure and multiple loading and unloading cycles to the flexible pressure sensitive coil to improve the stability of a conductive networkinside the coil; in calibration phase, obtaining a critical impedance of the flexible pressure sensitive coil and its corresponding critical digital quantity, and obtaining calibration data of non-contact and contact phases; in a measurement phase, comparing a digital quantity corresponding to the impedance of the flexible pressure sensitive coil with a critical digital quantity to determine whether the flexible pressure sensitive coil is in the contact phase, and obtaining the pressure and non-contact displacement by using calibration data. The method for measuring pressure and non-contact displacement by using the flexible pressure sensitive coil can improve the repeatability of the impedance of the flexible pressure sensitive coil with pressure and non-contact displacement, and can judge the stress state of the coil, thereby achieving measurement in the contact and non-contact phases, which is particularly suitable for 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, pressure measurement and non-contact displacement measurement. Background technique [0002] More and more modern engineering applications urgently require sensors to be thin and soft. For example, interlayer pressure and non-contact displacement measurement on narrow curved surfaces of large-scale equipment is the key to increasing assembly speed and ensuring safe system operation. However, due to the limitation of the size of the site space structure, it is difficult to install traditional rigid sensors. Therefore, the sensor needs to be flexible, and can be attached to the narrow curved surface layer to complete the measurement task of pressure and non-contact displacement. Coils made of conductive polymer composites have flexibility, pressure sensitivity, and non-contact displacement sensitivity, so they can be used to prepare flexible pressure-sensitive co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L1/22G01B7/02
CPCG01B7/02G01L1/22G01L1/2268
Inventor 王璐珩吕丹丹凌玉华
Owner CENT SOUTH UNIV
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