A Highly Sensitive Temperature Sensor Based on Power Changes of Fiber Bragg Grating Pairs

作者：Tang Guoyu^*; Wang Rong; Zhou Wei; Yang Meichao; Wu Mingyu; Xu Xiaofeng

来源：IEEE Photonics Technology Letters, 2015, 27(17): 1806-1808.

DOI：10.1109/LPT.2015.2443134

• Fiber Bragg grating
• optical fiber sensor
• power difference
• temperature measurement

A highly sensitive temperature sensor based on power change of double fiber Bragg gratings (FBGs) structure is proposed in this letter. It consists of two identical FBGs (FBG1, FBG2), in which the Bragg wavelength of FBG1 is modulated by the temperature and its reflecting light is injected into FBG2. Thus, the power difference of two peaks that appear in the transmission spectrum of FBG2 can be modulated by temperature around FBG1. By shifting the Bragg wavelength of FBG2, the sensor can achieve the segmental measurement of temperature. In the experiment, dynamic range of 25 degrees C-135 degrees C and sensitivity of 1.35 +/- 0.02 dBm/degrees C have been achieved.

• 出版日期2015-9-1
• 单位吉林大学