Title :
Long distance remote sensing of methane gas using a 1.65 μm DFB LD and a single mode fiber
Author :
Nagai, Haruo ; Aizawa, Masahumi ; Ono, Jun
Author_Institution :
Res. Lab., Anritsu Corp., Kanagawa, Japan
fDate :
30 Oct-2 Nov 1995
Abstract :
We have developed DFB LDs for the sensing of various kinds of gases, and, the 1.65 μm DFB LDs, which have been used for methane gas sensing, have the longest wavelength at the present stage. These LDs are packaged in butterfly modules with a thermo-electric cooler and an optical isolator for convenience of practical use. Second harmonic detection and differential absorption methods are widely used as the detection techniques, and wavelength stabilization to one of the absorption lines of a given gas is a key technique for both methods. For the wavelength stabilization a DFB LD module with a reference gas cell has been developed
Keywords :
chemical variables measurement; distributed feedback lasers; fibre optic sensors; gas sensors; laser feedback; optical harmonic generation; organic compounds; remote sensing; remote sensing by laser beam; semiconductor lasers; spectrochemical analysis; 1.65 mum; DFB LD module; absorption lines; butterfly module; detection techniques; differential absorption methods; long distance remote sensing; methane gas; methane gas sensing; optical isolator; reference gas cell; second harmonic detection; sensing; single mode fiber; thermo-electric cooler; wavelength stabilization; Absorption; Biomedical optical imaging; Chemical industry; Explosives; Gases; Laboratories; Monitoring; Optical sensors; Petroleum; Remote sensing;
Conference_Titel :
Lasers and Electro-Optics Society Annual Meeting, 1995. 8th Annual Meeting Conference Proceedings, Volume 1., IEEE
Conference_Location :
San Francisco, CA
Print_ISBN :
0-7803-2450-1
DOI :
10.1109/LEOS.1995.484732
