Passive scene imaging of absorbing gases by narrowband dielectric filter modulation

D. M. Benton

doi:10.2971/jeos.2013.13008

Journal of the European Optical Society - Rapid publications, Vol 8 (2013)

Passive scene imaging of absorbing gases by narrowband dielectric filter modulation

D. M. Benton

Abstract

This paper examines a method for locating within a scene a distribution of an absorbing gas using a passive imaging technique. An oscillatory modulation of the angle of a narrowband dielectric filter located in front of a camera imaging a scene, gives rise to an intensity modulation that differs in regions occupied by the absorbing gas. A preliminary low cost system has been constructed from readily available components which demonstrates how the location of gas within a scene can be implemented. Modelling of the system has been carried out, especially highlighting the transmission effects of the dielectric filter upon different regions of the image.

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