Abstract
A high-sensitivity temperature sensor based on the harmonic Vernier effect is proposed and verified by experiments. The main component of the sensor is a Sagnac interferometer consisting of two sections of polarization maintaining fibers (PMFs) spliced with an intersection angle of 45° between their fast axes. The harmonic Vernier effect is achieved by setting the length of one of the PMFs an integral multiple (i-times) of the length of the other plus a detuning factor. Compared with the Sagnac interferometer based on the fundamental Vernier effect, the temperature sensitivity of the harmonic Vernier effect is higher, reaching i+1 times of that of the fundamental Vernier effect (i is the order of the harmonic).
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We acknowledge the supports from the National Natural Science Foundation of China (Grant No. 62175116) and 1311 Talent Plan of Nanjing University of Posts and Telecommunications.
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He, M., Zhu, B. & Zhang, Z. High Sensitivity Temperature Sensor Based on Harmonic Vernier Effect. Photonic Sens 13, 230204 (2023). https://doi.org/10.1007/s13320-023-0677-x
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DOI: https://doi.org/10.1007/s13320-023-0677-x