TAILIEUCHUNG - Báo cáo "Investigation of the embedded fiber bragg grating temperature sensor "

An embedded fiber Bragg grating (FBG) sensor, which fabricated in IMS, for temperature sensing was proposed. The temperature responses of the in-fiber Bragg gratings (FBGs) have been investigated. It was found that these responses ranged from pm/°C to pm/°C. The temperature sensitivity of the FBGs was °C. The strain responses remained temperature independent over a temperature range of 20 – 180 ◦C. | VNU Journal of Science Mathematics - Physics 23 2007 237-242 Investigation of the embedded fiber bragg grating temperature sensor Tran Thi Tam1 . Dang Quoc Trung2 Tran Anh Vu2 Le Huu Minh2 Do Ngoc Chung2 department of Engineering Physics and Nano-Technology College of Technology VNU 144 Xuan Thuy Cau Giay Hanoi Vietnam 2 Institute of Materials Science Vietnam Academy of Science and Technology Hoang Quoc Viet Cau Giay Hanoi Vietnam Received 5 November 2007 received in revised form 27 December 2007 Abstract. An embedded fiber Bragg grating FBG sensor which fabricated in IMS for temperature sensing was proposed. The temperature responses of the in-fiber Bragg gratings FBGs have been investigated. It was found that these responses ranged from pm C to pm C. The temperature sensitivity of the FBGs was C. The strain responses remained temperature independent over a temperature range of 20 - 180 C. The results obtained are in agreement within the experimental error with predictions based on material parameters. Although the temperature response is nonlinear over the temperature range 20 C to 180 C in practical systems the temperature response of the sensor may be assumed to be linear within the temperature range 20 C to 80 C. Keywords Fiber Bragg Grating FBG sensor strain temperature sensor 1. Introduction The Fiber Bragg Grating FBG first presented by Hill et al. 1 in 1978 is a structure on an optical fiber in which the refractive index of a fiber core is periodically modulated with a pitch A Figure 1 . The index modulation is induced by exposing the fiber to an interference pattern formed between interfering ultraviolet UV beams of light by double-beam or phase mask technique. The center wavelength of the reflection ẰB is named Bragg wavelength . The Bragg wavelength is ÀB 2nA 1 where n is the effective refractive index of the fiber core. The FBG forms a distributed reflector acting as a narrow band channel dropping spectral filter in transmission and as a

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