All-Fiber Loading Sensor Based on a Hybrid 45° and 81° Tilted Fiber Grating Structure

Abstract

Abstract-We experimentally demonstrate an all-fiber loading sensor system based on a 45°-and an 81°-tilted fiber grating (TFG). We have fabricated two TFGs adjacent to each other in a single fiber to form a hybrid structure. When the transverse load applied to the 81º-TFG, the light coupling to the two orthogonally polarized modes will interchange the power according to the load applied to the fiber, which provides a solution to measure the load. For real applications, we further investigated the interrogation of this all fiber loading sensor system using a low-cost and compact-size single wavelength source and a power meter. The experimental results have clearly shown that a low-cost high-sensitivity loading sensor system can be developed based on the proposed TFG configuration.

Temperature- and strain- insensitive transverse load sensing based on optical fiber reflective Lyot filter

“…Up to now, a considerable amount of optical fiber transverse load sensors have been developed utilizing different fiber devices. [6][7][8][9][10][11][12][13][14][15][16][17][18][19] The most common fiber device used to construct the transverse load sensor is fiber grating. Liu et al first reported a long period grating (LPG) in B/Ge co-doped fiber based transverse load sensor.…”

“…In addition, some special FBGs have been used to develop optical fiber load sensors, such as sampled fiber Bragg gratings (SFBGs), 13) chirped fiber Bragg gratings (CFBGs) 14) and tilted fiber gratings (TFGs). 15,16) Recently, Wang et al applied the microwave photonics filtering technique into a FBG sensor for highresolution transverse load measurement. 17) In addition, fiber based interferometers have also been used to measure the transverse load.…”