Wireless passive prestress sensor

Abstract

The invention belongs to the technical field of sensors, and particularly relates to a wireless passive prestress sensor which is used for detecting reinforcement prestress change information in a building structure. The wireless passive prestress sensor comprises a radio frequency module, a power module, a data acquisition module and a modulation module, wherein the radio frequency module has an LC resonant magnetic coupling model, the power module comprises a full bridge rectifier circuit and a voltage stabilization chip, and the data acquisition module comprises an analog-digital conversion chip, a micro-processing chip and a full bridge strain circuit. Signals are transmitted by an external device, reach a sensor through the radio frequency module and are processed into stable voltage by the power module, the data acquisition module converts acquired analog digitals into digital signals, data are modulated to the radio frequency signals by the modulation module and demodulated and acquired by the external device, and steel cable prestress in concrete is acquired by a prestress conversion device and can be detected for a long time or at regular intervals in the distance of about 30cm of the concrete thickness, so that safety accidents are prevented.

Description

technical field [0001] The invention belongs to the technical field of sensors, and in particular relates to a wireless passive prestress sensor capable of detecting the prestress of steel bars, in particular a prestress change sensor capable of detecting steel bars in thicker concrete layers. Background technique [0002] Health monitoring of building structures is a relatively new field. Real-time detection of prestress changes in internal structures of bridges, houses, and roads can help to understand the safety of buildings in advance and prevent safety accidents such as building collapses. However, the existing health detection devices are all active wired prestressed sensors, which make it difficult to deploy sensors in buildings, especially for sensors placed inside buildings; while active makes the application time of sensors less Limited, maintenance requires a large cost, and once the energy of the sensor inside the building is exhausted, it cannot be reused, resu...

AI Technical Summary

Problems solved by technology

However, the existing health detection devices are all active wired prestressed sensors, which make it difficult to deploy sensors in buildings, especially for sensors placed inside buildings; while

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