Community Research and Development Information Service - CORDIS

Abstract

Novel optical sensors for the detection of weak radiation flux have been developed which demonstrate high sensitivity, good stability and a fast reponse. The sensors are based on the modulation of an interference pattern created during the optical interrogation of a thin air cavity similar to a low finesse Fabry-Perot or Fizeau interferometer, but formed between two parallel glass holographic plates. This study deals with the development of theoretical and finite element thermoelastic models to determine the deflection of a holographic plate due to the absorption of radiation from an excitation laser source, where it is assumed that the cavity plates are mechanically decoupled. Predicted behaviour is compared to that observed experimentally, where the setup employed utilizes an active homodyne demodulation scheme to eliminate drift and hold the interferometric sensor at maximum sensitivity. A principal feature of the devices is their low cost and potential for miniaturization thus making them suitable for a wide range of industrial applications.

Additional information

Authors: WHELAN M P, JRC Ispra (IT);SHERIDAN J T, JRC Ispra (IT);KENNY R P, JRC Ispra (IT);COUTSOMITROS C T, JRC Ispra (IT)
Bibliographic Reference: EUR 16431 EN (1996) 49pp., FS
Availability: Available from the Public Relations and Publications Unit, JRC Ispra, I-21020 Ispra (IT)
Record Number: 199611112 / Last updated on: 1996-10-28
Category: PUBLICATION
Original language: en
Available languages: en