Design and characterization of passive wireless strain sensor.

摘要

In order to predict and avoid disasters due to the structure failure, reliable strain information is necessary to be monitored in real time. Existing strain sensing technologies offer outstanding performance in terms of the resolution and time response. However, these technologies require either physical connection of signal communication, battery power supply or expensive equipments for acquiring strain information. These limitations make existing strain sensing technologies unsuitable for structures such as aircraft and vehicle.; A novel passive wireless strain sensor has been developed in this research to over come the limitations of existing strain sensing technologies. The sensor employs a planar inductor which is series connected to an interdigital capacitor to eliminate the wire connection for power supply and data transmission. The sensor is activated by electromagnetic wave and the resonant frequency of the sensor is interrogated remotely with a single loop antenna by monitoring the frequency response of the voltage across it. The sensor was modeled and the strain effect on resonant frequency of the sensor was investigated. (Abstract shortened by UMI.)