Tan Yan-Nan, Zhang Yang, Jin Long, Guan Bai-Ou
PolyU-DUT Joint Research Center for Photonics, Dalian University of Technology, Dalian 116024, China.
Opt Express. 2011 Oct 10;19(21):20650-6. doi: 10.1364/OE.19.020650.
We propose and experimentally demonstrate a novel simultaneous strain and temperature fiber optic sensor. The sensing head is formed by two concatenated ultra-short distributed Bragg reflector lasers that operate in single longitude mode with two polarization modes. The total length of the sensing head is only 18 mm. The two lasers generate two polarization mode beat notes in the radio-frequency range which show different frequency response to strain and temperature. Simultaneous strain and temperature measurement can be achieved by radio-frequency measurement. This approach has distinctive advantages of ease of interrogation and avoidance of expensive wavelength detection.
我们提出并通过实验证明了一种新型的同时测量应变和温度的光纤传感器。传感头由两个串联的超短分布布拉格反射器激光器组成，它们在单纵模下以两种偏振模式工作。传感头的总长度仅为18毫米。这两个激光器在射频范围内产生两个偏振模式拍频信号，它们对应变和温度表现出不同的频率响应。通过射频测量可以实现应变和温度的同时测量。这种方法具有易于检测和避免昂贵的波长检测等显著优点。
