Title :
Phase insensitive Frequency Modulation sensor for long distance CO2 monitoring
Author :
Deev, Andrei ; Wu, Sheng
Author_Institution :
California Inst. of Technol., Pasadena
Abstract :
In this paper we report on the latest progresses we made on the open-air long-distance (>1 km) CO2 monitor that is based on tunable diode laser two tone frequency modulation (TTFM) spectroscopy. To overcome the need to exactly determine and maintaining phase in the setup (Silver et al., 1992), we designed our TTFM transceiver so that it is phase insensitive.
Keywords :
frequency modulation; gas sensors; measurement by laser beam; optical modulation; semiconductor lasers; spectroscopy; CO2; long distance carbon dioxide monitoring; phase insensitive frequency modulation sensor; tunable diode laser; two tone frequency modulation spectroscopy; Apertures; Fluctuations; Frequency modulation; Gas detectors; Instruments; Laser noise; Low-frequency noise; Monitoring; Optical sensors; Transceivers;
Conference_Titel :
Lasers and Electro-Optics, 2007. CLEO 2007. Conference on
Conference_Location :
Baltimore, MD
Print_ISBN :
978-1-55752-834-6
DOI :
10.1109/CLEO.2007.4452777
