Optical fiber-tip Fabry-Perot interferometer for hydrogen sensing

作者：Zhang, Guilin; Yang, Minghong^*; Wang, Yao

来源：Optics Communications, 2014, 329: 34-37.

DOI：10.1016/j.optcom.2014.04.084

• Fabry-Perot interferometers
• Optical fiber sensors
• Hydrogen
• Coatings

A novel optical fiber-tip Fabry-Perot interferometer (FPI) coated with Pt/WO3 film was demonstrated as a hydrogen sensor. The air-cavity of FR was formed by inserting a single mode fiber (SMF) into a partially polymer-filled glass capillary. A layer of Pt/WO3 was coated on the capillary of the FM serving as a reaction heater upon hydrogen exposure. The heat locally raised the FM temperature, which led to the length of air-cavity decrease due to the volume expansion of polymer. Thus, the dip wavelength of interference spectrum yielded a blue shift. The temperature compensation method based on an optical switch was proposed to eliminate the effect of ambient temperature fluctuation. Experimental investigations demonstrated a high sensitivity of -5.1 nm/% at a low hydrogen concentration ranging from 0% to 0.5%.

• 出版日期2014-10-15
• 单位武汉理工大学