Title :
Experimental demonstration of a fiber-optic gas sensor network addressed by FMCW
Author :
Ho, H.L. ; Jin, W. ; Yu, H.B. ; Chan, C.C. ; Chan, C.C. ; Demokan, M.S.
Author_Institution :
Dept. of Electr. Eng., Hong Kong Polytech., Kowloon, China
Abstract :
We report on the use of frequency-modulated continuous-wave and wavelength modulation spectroscopy techniques for addressing a multipoint gas sensor network. A three-sensor network of ladder topology is experimentally demonstrated for the detection of acetylene gas. A minimum detectable concentration of 270 ppm//spl radic/Hz is obtained with 25-mm gas cells under atmospheric pressure which corresponds to a minimum detectable absorbance of 3.40/spl times/10/sup -4/. The crosstalk between the sensors is below -22 dB.
Keywords :
chemical variables measurement; fibre optic sensors; frequency modulation; gas sensors; modulation spectroscopy; optical modulation; spectrochemical analysis; 25 mm; FMCW; acetylene gas; atmospheric pressure; crosstalk; fiber-optic gas sensor network; frequency-modulated continuous-wave; ladder topology; minimum detectable absorbance; minimum detectable concentration; multipoint gas sensor network; three-sensor network; wavelength modulation spectroscopy techniques; Frequency; Gas detectors; Intensity modulation; Optical fiber polarization; Optical fiber sensors; Optical sensors; Sensor systems; Spectroscopy; Time division multiplexing; Voltage-controlled oscillators;
Journal_Title :
Photonics Technology Letters, IEEE
