This study integrated a fiber loop manufactured by using commercial fiber (SMF-28, Corning) and a fiber Bragg grating (FBG) to form a fiber optic sensor that could simultaneously measure displacement and temperature. The fiber loop was placed in a thermoelectric cooling module with FBG affixed to the module, and, consequently, the center wavelength displacement of FBG was limited by only the effects of temperature change. Displacement and temperature were determined by measuring changes in the transmission of optical power and shifts in Bragg wavelength. This study provides a simple and economical method to measure displacement and temperature simultaneously.
Jung, J.; Nam, H.; Lee, J.H.; Park, N.; Lee, B. Simultaneous measurement of strain and temperature by use of a single-fiber Bragg grating and an erbium-doped fiber amplifier. Appl. Opt. 1999, 38, 2749–2751.
Hadeler, O.; Ibsen, M.; Zervas, M.N. Distributed-Feedback fiber laser sensor for simultaneous strain and temperature measurements operating in the radio-frequency domain. Appl. Opt. 2001, 40, 3169–3175.
Lai, C.W.; Lo, Y.L.; Yur, J.P.; Chuang, C.H. Application of fiber Bragg grating level sensor and Fabry-Perot pressure sensor to simultaneous measurement of liquid level and specific gravity. IEEE Sens. J. 2012, 12, 827–831.
Gu, B.; Yuan, W.; He, S.; Bang, O. Temperature compensated strain sensor based on cascaded Sagnac interferometers and all-solid birefringent hybrid photonic crystal fibers. IEEE Sens. J. 2012, 12, 1641–1646.