The Study of Unbalanced In-Line Sagnac Fiber-Optics Temperature Sensor

• Main Authors: Tsau-Rong Xun, 曹榮勳
• Other Authors: n
• Format: Others
• Language: zh-TW
• Published: 2004
• Online Access: http://ndltd.ncl.edu.tw/handle/hwnn6r

碩士 === 崑山科技大學 === 電子工程研究所 === 92 === We demonstrate a highly sensitive temperature sensor with a stress-induced high-birefringence-fiber as the sensing component, the new design of Unbalanced In-Line Sagnac Fiber-Optics interferometer that is able to sense the temperature using spectral domain by shifts. Knowing the length and the sensitivity of sensor fiber are proportional to each other, the result of this research shows the sensor fiber has the highest sensitivity at length 70cm, the sensitivity is 1.476nm/℃, and the resolution is 0.04℃; the average inaccuracy is 0.78%. When using separation between peak to measure absolute Temperature, its sensitivity is 0.013 nm/℃. In order to optimize the system, C+L band ASE was used as sensor source. Not only its bandwidth expands from 1520nm to 1620nm, and output power up to 16dBm, it has high wavelength stability and no polarization direction. All those advantages can lower the system’s intensity noise and polarization floating while augmenting the resolution and accuracy. In short, with C+L band ASE light sources, this newly designed system’s application on the sensor system will be immeasurable.