论文题目：Inexpensive optical fiber Fabry–Perot microcavity with controllable length for sensitive temperature measurements
作者：贺同月
导师：赵勇、陈茂庆
发表刊物：Instrumentation Science & Technology
论文收录：SCI
论文摘要：A simple to fabricate, highly sensitive and inexpensive optical fiber probe-type temperature sensor with Fabry-Perot (FP) microcavity of controlled length is presented and demonstrated. The microcavity with controllable length is fabricated by single-mode fiber (SMF) and polydimethylsiloxane (PDMS) for temperature sensing. After the PDMS is cured, the SMF is connected to the supercontinuum light source (SCLS) and the optical spectrometer analyzer (OSA) for online observation of the shape of the reflection spectrum. The micro-displacement platform is used to pull the SMF under the action of stress to form an air cavity. After the air cavity is stabilized, ultraviolet rays (UV) glue is used for packaging outside the PDMS. The FP microcavity is composed by the end face of the SMF and the face of PDMS. The length of the FP microcavity can be controlled online bythe micro-displacement platform to a minimum of 15 μm. Moreover, it is worth noting that the free spectral range (FSR) can reach 74.8 nm and the interference fringe contrast (IFC) can reach 19.8 dB to allow sensitivity temperature measurements with a wide range. Experiments show that in the range of 33 ℃ to 93 ℃, there is a high temperature sensitivity of 5.388 nm/℃ with a high repeatability and linearity (R2 =0.9937). Stability experiments are also carried out, the maximum change in wavelength and intensity are only 45 pm and 0.035 dB, respectively. It is anticipated that such easy making, compact and inexpensive fiber-optic temperature sensors could find important applications in practice.
