Passive wireless displacement sensor based on helix antenna and displacement sensing system

Abstract

The invention belongs to the field of building structure monitoring technologies and particularly relates to a passive wireless displacement sensor based on a helix antenna and a displacement sensingsystem. The wireless radio frequency identification technology is adopted to realize passive wireless displacement measurement. The displacement sensor comprises a silicon rod, a contact, a reboundingdevice, the helix antenna, a support tube and an RFID chip, wherein the support tube is a hollow thin tube, and the helix antenna is arranged outside the support tube in a sleeving mode; the RFID chip is located at the upper end of the helix antenna and is connected with the helix antenna in series; identification information of the passive wireless displacement sensor based on the helix antennais stored in the RFID chip; the silicon rod is placed in the support tube in an up-and-down moving mode; and the rebounding device comprises a rebounding spring and a rebounding sleeve, wherein the rebounding sleeve is arranged above the silicon rod and makes contact with the silicon rod, the rebounding spring is located above the rebounding sleeve and connected with the inner wall of the supporttube, meanwhile a sliding slot is formed in the outer wall of the rebounding spring, the rebounding spring is connected with the rebounding sleeve in a sliding mode through the sliding slot, and the lower end of the silicon rod is rigidly connected with the upper end of the contact.

Description

technical field [0001] The invention belongs to the technical field of building structure monitoring, and in particular relates to a passive wireless displacement sensor and a displacement sensing system based on a helical antenna. Background technique [0002] The performance of important engineering structures such as buildings and bridges gradually degrades over time under the use of loads and the environment. In order to accurately assess the deterioration of structures, a large number of structural health monitoring researches have been developed in the past few decades. As a key part of the structural health monitoring system, sensors can detect parameters such as strain, crack, displacement and acceleration, which provide a reliable basis for the evaluation of structural performance. In addition, in engineering scientific research, structural static test and material performance test occupy a very important position. In static tests and material performance tests, it...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to propose a passive wireless displacement sensor and displacement sensing system based on a helical antenna to solve the problem of traditional sensors providing energy and transmitting information by wire, which is used to realize passive wireless detection of structural displacement

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