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Chemical detection using pulse narrowing in evanescent wave sensors

✍ Scribed by V. Ruddy; J. Maguire

Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
340 KB
Volume
42
Category
Article
ISSN
0924-4247

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✦ Synopsis

The detection of a chemical species located m the daddmg regon of a section of a step-Index multnnode fibre, usmg the frequency power spectrum of a transnutted and back-reflected optlcal pulse m the fibre, IS dlscussed The techmque IS evaluated for the dlstnbuted sensmg of flu&, partaxdarly gases wth absorption bands m the vlslble and near mfrared portlon of the spectrum. The method whde less sensltwe than evanescent wave transmlsslon spectroscopy IS particularly sulted to dlstibuted senang wdh alI the measurements made at the launch end of the fibre

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