Study of Temporal Thermal Response of Microfiber Bragg Grating
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Study of Temporal Thermal Response of Microfiber Bragg Grating Changrui LIAO1,2*, Tianhang YANG1,2, and Jinli HAN1,2 1
Shenzhen Key Laboratory of Photonic Devices and Sensing Systems for Internet of Things, College of Physics and
Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China 2
Guangdong and Hong Kong Joint Research Centre for Optical Fibre Sensors, Shenzhen University, Shenzhen 518060,
China *
Corresponding author: Changrui LIAO
E-mail: [email protected]
Abstract: Fiber Bragg grating has been successfully fabricated in the silica microfiber by the use of femtosecond laser point-by-point inscription. Temporal thermal response of the fabricated silica microfiber Bragg grating has been measured by the use of the CO2 laser thermal excitation method, and the result shows that the time constant of the microfiber Bragg grating is reduced by an order of magnitude compared with the traditional single-mode fiber Bragg grating and the measured time constant is ~ 21 ms. Keywords: Fiber optics sensors; fiber optics and optical communications; fiber optics components Citation: Changrui LIAO, Tianhang YANG, and Jinli HAN, “Study of Temporal Thermal Response of Microfiber Bragg Grating,” Photonic Sensors, DOI: 10.1007/s13320-020-0602-5.
1. Introduction Temperature is one of the principal parameters in thermodynamics and temperature measurement, which plays an important role in industry, medicine, scientific research, and people’s daily life [1–3]. Over the past few decades, different kinds of thermometers, such as glass liquid thermometer, thermocouple, and resistance thermometer, have been widely used. In the case of extreme environment such as corrosive, strong electromagnetic, flammable, and explosive, most of the traditional thermometers cannot meet the practical needs. Since silica fibers are good at high temperature stability, corrosion resistant, and anti-electromagnetic interference, silica-fiber based temperature sensors have attracted more and more
attention recently [4–8]. Temporal thermal response of the sensing element is especially important for some rapidly changing and dynamic systems such as internal combustion engines. Liao et al. [9] have systemically studied temperature response of the femtosecond laser (FS) fabricated fiber Bragg gratings (FBGs) and found the temporal thermal response is dependent on the cross-sectional dimension of the fiber. Temporal thermal response has a linear relationship with the diameter of the fiber.
2. Experimental details In this work, the silica microfiber is produced by the use of the flame brushing method [10, 11] in the fiber tapering system built in our lab. The single mode fiber (SMF) is fixed between two co-axial
Received: 21 June 2020 / Revised: 24 July 2020 © The Author(s) 2020. This article is published with open access at Springerlink.com DOI: 10.1007/s13320-020-0602-5 Article type: Regular
Photonic Sensors
translation stages with fiber holders. The hydrogen flame with a diameter of ~10 mm is mounted above the fiber in the middle of
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