Multiplexing Scheme of Long-Period Grating Sensors Based on a Modified Optical Frequency Domain Reflectometry

作者：Jiang Meng^*; Chen Daru; He Sailing

来源：IEEE Photonics Technology Letters, 2008, 20(21-24): 1962-1964.

DOI：10.1109/LPT.2008.2005531

• Fiber sensor
• long-period fiber gratings
• optical frequency domain reflectometry
• optical multiplexing system

We propose a novel quasi-real-time sensing scheme by employing a modified optical frequency domain reflectometry technique to multiplex long-period grating (LPG) sensors of transmission mode. Different sensing signals are demodulated by different beat signals through presetting different values for the optical path differences between the measuring arms and a static reference arm. The amplitude of each beat signal is associated with the transmissivity of a sensing LPG. The present multiplexing scheme has the advantages of real-time, high speed, high sensitivity, large capacity, and high resolution over an intermediate length. A measurement of fiber bending curvature is demonstrated to verify good performances of the present LPG sensing system.

• 出版日期2008-12
• 单位浙江大学