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Experimental demonstration of a fiber-optic gas sensor network addressed by FMCW

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6 Author(s)
Ho, H.L. ; Dept. of Electr. Eng., Hong Kong Polytech., Kowloon, China ; Jin, W. ; Yu, H.B. ; Chan, C.C.
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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.

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Photonics Technology Letters, IEEE  (Volume:12 ,  Issue: 11 )