Application of Notched Long-Period Fiber Grating Based Sensor for CO_2 Gas Sensing

摘要

An inductively coupled plasma etching process to fabricate notched long-period fiber gratings for CO_2 gas sensing is proposed in this article. In the gas sensing test, the 15% mixed CO_2 gas was used for characterization of CO_2 adsorption by the amine-modified nanoporous silica foams of the notched long-period fiber grating sensor. The results shows the spectra were changed with the CO_2 gas flow within 13 min. During the absorption process, the transmission of the resonant dip was decreased by 2.884 dB. Therefore, the proposed notched long-period fiber grating gas sensor shows good performance and is suitable as a gas sensor for monitoring the CO_2 adsorption process.