Passive scene imaging of absorbing gases by narrowband dielectric filter modulation

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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.
Original languageEnglish
Article number13008
JournalJournal of the European optical society
Volume8
DOIs
Publication statusPublished - 31 Jan 2013

Keywords

  • absorption
  • spectral imaging
  • modulation

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