Kuo Li, Zhen'an Zhou, Aichun Liu. A high sensitive fiber Bragg grating cryogenic temperature sensor[J]. Chinese Optics Letters, 2009, 7(2): 02121
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At cryogenic temperature, a fiber Bragg grating (FBG) temperature sensor with controllable sensitivity and variable measurement range is demonstrated by using bimetal configuration. In experiments, sensitivities of -51.2, -86.4, and -520 pm/K are achieved by varying the lengths of the metals. Measurement ranges of 293-290.5, 283-280.5, and 259-256.5 K are achieved by shortening the distance of the gap among the metals.