title: Improved low concentration gas detection system based on intracavity fiber laser.
abstract: The improvement of a low concentration gas detection system based on the intracavity fiber laser is proposed in this paper. The sensitivity of the system is deduced based on Lambert-Beer law. The optimized system was established with the gas cell made elaborately. In order to apply the wavelength sweeping technique, the fiber Bragg grating reflector was substituted by the wavelength independent Faraday rotation reflector. The sensitivity of the system for acetylene detection is reduced to less than 100 ppm by using the average of three absorption spectra. The acetylene detection coefficients of variation with different concentrations are measured. The gas measurement system is validated to detect low concentration gas effectively.
authors.affiliation: College of Precision Instrument and Opto-electronics Engineering, Tianjin University, Tianjin, China. hxzhang@tju.edu.cn
authors.forename: Hongxia
authors.initials: H
authors.lastname: Zhang
authors.forename: Kun
authors.initials: K
authors.lastname: Liu
authors.forename: Dagong
authors.initials: D
authors.lastname: Jia
authors.forename: Tianhua
authors.initials: T
authors.lastname: Xu
authors.forename: Tiegen
authors.initials: T
authors.lastname: Liu
authors.forename: Gangding
authors.initials: G
authors.lastname: Peng
authors.forename: Wencai
authors.initials: W
authors.lastname: Jing
authors.forename: Yimo
authors.initials: Y
authors.lastname: Zhang