P K Choudhury and Toshihiko Yoshino 2002 Meas. Sci. Technol. 13 1793 doi:10.1088/0957-0233/13/11/316
P K Choudhury1 and Toshihiko Yoshino2
Show affiliationsA proposal is made of the use of fibre optic sensors for chemical sensing where the measurements of rate coefficients of time-dependent chemical reactions are performed. When an optical fibre is bent and a part of its cladding is stripped off, the sensitivity of the system improves because of the higher penetration depth achieved in this case. The sensor works on the principle of evanescent wave absorption spectroscopy. The rate constant of a chemical reaction is determined using this principle, and the validity of the result is confirmed by comparing it with that obtained by a spectrophotometer. Comparison is made between the results obtained using bent as well as straight probes, and it is noticed that the system incorporating the former gives results closer to those obtained by spectroscopic measurements, which is essentially because of the improved sensitivity of the system.
07.07.Df Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing
42.81.Bm Fabrication, cladding, and splicing
82.80.Jp Activation analysis and other radiochemical methods
Instrumentation and measurement
Issue 11 (November 2002)
Received 26 March 2002, accepted for publication 6 June 2002, in final form 20 May 2002
Published 3 October 2002
P K Choudhury and Toshihiko Yoshino 2002 Meas. Sci. Technol. 13 1793
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