Sensors & Transducers Journal
(ISSN 1726- 5479)
Vol. 82, Issue 8, August 2007, pp.1470-1479
Prism Based Real Time Refractometer
Anchal Srivastava, R. K. Shukla, Atul Srivastava, Manoj K. Srivastava
and Dharmendra Mishra
Department of Physics, University of Lucknow, Lucknow INDIA-226007
Received: 16 July 2007 /Accepted: 20 August 2007 /Published: 27 August 2007
Abstract: A rigorous theoretical study of prism based real time refractometer sensor where modulation in reflected light intensity with variation in ambient refractive index is the sensing mechanism is made. Effect of polarization of incident light used in such sensors is studied. Effect on emergent light intensity due to reflection and transmission at various interfaces in the sensor configuration is compared with the intensity obtained when only the prism-ambient interface is considered for normal incidence of light at the air-prism interface; result comes out to be the same for both the cases. For obliquely incident light the difference is determined by the percentage fractional loss. Theoretical expressions obtained are in good agreement with experimental observations.
Keywords: Refractometer, Prism, Oblique incidence, Fresnels Relations, Refractive index
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