Femtosecond Laser Ablated FBG with Composite Microstructure for Hydrogen Sensor Application

Sensors

Meng Zou¹  Xian Zhou¹  Ke Dong¹  Yutang Dai¹  Minghong Yang¹ 

[1] National Engineering Laboratory for Fiber Optic Sensing Technology, Wuhan University of Technology, Luoshi Road 122, Wuhan 430070, China;

关键词: fiber optics sensor;    thin films;    laser materials processing;   

DOI  :  10.3390/s16122040

来源: DOAJ

【 摘 要 】

A composite microstructure in fiber Bragg grating (FBG) with film deposition for hydrogen detection is presented. Through ablated to FBG cladding by a femtosecond laser, straight-trenches and spiral micro-pits are formed. A Pd–Ag film is sputtered on the surface of the laser processed FBG single mode fiber, and acts as hydrogen sensing transducer. The demonstrated experimental outcomes show that a composite structure produced the highest sensitivity of 26.3 pm/%H, nearly sevenfold more sensitive compared with original standard FBG. It offers great potential in engineering applications for its good structure stability and sensitivity.

【 授权许可】

Unknown