Abstract
By analyzing absorption spectrum of methane gas and development trend of optical device, this paper presents a methane-sensing system based on the infrared absorption principle, which refers to that a multi-molecule gas will absorb light at its characteristic wavelength and then the changing intensity of light is the indication of the concentration of the gas. In the system, a DFB LD with wavelength 1.33 μrn serves as the light power, and an optical power meter is used for detecting the intensity of light. Experiments verified that the system is reliable for detecting mathane with concentration of less than 15% by infrared absorption, laying foundation for its real applications such as alarm.
| Original language | English |
|---|---|
| Pages (from-to) | 156-158 |
| Number of pages | 3 |
| Journal | Yadian Yu Shengguang/Piezoelectrics and Acoustooptics |
| Volume | 30 |
| Issue number | 2 |
| State | Published - Apr 2008 |
Keywords
- DFB LD
- Methane
- Near infrared absorption
- Optical fiber sensing system