[OPTICAL REVIEW Vol. 6, No. 1 (1999) 68-70]
Detection of Refractive Index Change of Liquids by Diffractive Element Based Sensor
Raimo SILVENNOINEN,1 Kai-Erik PEIPONEN1 and Jukka RÄTY2
1Department of Physics, University of Joensuu, P.O. Box 111, FIN-80101 Joensuu, Finland, 2Measurement and Sensor Laboratory, University of Oulu, Technology Park 127, FIN-87400 Kajaani, Finland
(Received August 17, 1998; Accepted October 8, 1998)
Refractive index change of liquids was detected using a temperature compensated prism cavity together with a diffractive optical element fabricated by electron beam lithography. Small changes of refractive index could be detected from image data of the sensor.
Key words : refractive index change of liquids, diffractive optical element, process industry