A novel fibre-optic system for methane detection

Xijun Wu; Yutian Wang; Leilei Chen; Xinyan Huang

doi:10.1117/12.756001

26 November 2007 A novel fibre-optic system for methane detection

Xijun Wu, Yutian Wang, Leilei Chen, Xinyan Huang

Proceedings Volume 6830, Advanced Sensor Systems and Applications III; 68301B (2007) https://doi.org/10.1117/12.756001
Event: Photonics Asia 2007, 2007, Beijing, China

Abstract

A novel fibre-optic methane detection system was proposed, which involved sampled fibre grating and improved differential absorption detection technique. By this method, near-infrared equal-spaced multi absorption line of methane was detected simultaneously, and that gas weak absorption detection theory was developed. Using the comb shaped filter characteristic of sampled fibre grating, R2, R3 and R4 line of molecule absorption spectrum in 2ν 3 overtone band around 1.66μm was measured at one time. Two sampled fibre gratings of same type were used to fulfill the task of difference absorption detection. One sampled grating worked as measure grating with its reflection spectrum corresponding to the absorption line. The other grating worked as reference grating with its reflection spectrum deviate from that of measure grating to some extent. Chirped fibre grating with its central wavelength around R3 was adopted as optical band-pass filter. The light power of the three absorption line and the three reference wavelength was detected alternately by PIN PD at the same time. So that difference absorption detection was achieved. The effect of light source instability was avoided by ratio treatment. The validity of the system was verified by experiments.

Citation Download Citation

Xijun Wu, Yutian Wang, Leilei Chen, and Xinyan Huang "A novel fibre-optic system for methane detection", Proc. SPIE 6830, Advanced Sensor Systems and Applications III, 68301B (26 November 2007); https://doi.org/10.1117/12.756001

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available