Compact Fabry-Perot microfiber interferometer temperature probe with closed end face

• Published in: Measurement : journal of the International Measurement Confederation 2021-06, Vol.178, p.109391, Article 109391
• Main Authors: Li, Jin, Wang, Yan-nan, Yang, Jun-tong
• Format: Article
• Language: English
• Subjects: Electronic implants; Fabry-Perot interferometers; Fiber optics; Integrated optics; Interferometers; Interferometry; Microfiber sensor; Microfibers; Polydimethylsiloxane; Sensors; Stability tests; Tapering; Temperature; Temperature sensor
• ISSN: 0263-2241; 1873-412X
• DOI: 10.1016/j.measurement.2021.109391

•An end closed miniature temperature probe based on microfiber was proposed.•The Fabry-Perot is composited by microfiber taper and conical air cavity.•Temperature sensitivity of 2.41 nm/°C was experimentally demonstrated.•Impact of microfiber diameter and cavity length was studied. In this paper, a Fabry-Pérot interferometer microprobe was constructed based on microfiber taper and hollow microfiber cone cavity. The interference cavity length of the Fabry-Pérot structure can be flexibly changed by moving the microfiber taper in the hollow microfiber. Polydimethylsiloxane solution was filled into the air cavity of the Fabry-Pérot interferometer to build a Fabry-Pérot temperature-sensitive microprobe with a stable structure by coaxially fixing the microfiber taper in the hollow fiber. The temperature sensitivity reached up to 2.41 nm/°C. The triple-repeated measurements and stability tests were experimentally verified with an excellent sensing performance. This small, compact, and end-sealed temperature-sensitive probe will push forward the development of wearable or implantable sensors.