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

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...

AI Technical Summary

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

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