Remote identification of liquid surface contamination by imaging Fourier transform spectrometry

Roland Harig; René Braun; Chris Dyer; Chris Howle; Ben Truscott

doi:10.1117/12.780602

16 April 2008 Remote identification of liquid surface contamination by imaging Fourier transform spectrometry

Roland Harig, René Braun, Chris Dyer, Chris Howle, Ben Truscott

Proceedings Volume 6954, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing IX; 69540G (2008) https://doi.org/10.1117/12.780602
Event: SPIE Defense and Security Symposium, 2008, Orlando, Florida, United States

Abstract

Imaging Fourier transform spectrometry (FTS) was applied to remotely identify liquids on various surfaces. The spectra are dependent on the liquid film (composition and dimensions), the background surface and the illumination (artificial source or radiation from the sky). A radiative transfer model was applied to calculate spectra of the liquid films. By classifying the background materials by their optical properties, a reduced set of spectra was created as reference signatures for automatic identification. Based on the radiative transfer model, an automatic identification algorithm was implemented. Measurements were performed with an imaging Fourier transform spectrometer developed at TUHH. The results of the analysis are displayed by a video image overlaid with an image of the identified liquid. Various liquids on diverse surfaces were identified automatically. In addition to active measurements, passive measurements without an artificial source of radiation were performed. The results presented show that by means of the radiative transfer model, automatic remote identification of liquid contamination is possible.

Citation Download Citation

Roland Harig, René Braun, Chris Dyer, Chris Howle, and Ben Truscott "Remote identification of liquid surface contamination by imaging Fourier transform spectrometry", Proc. SPIE 6954, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing IX, 69540G (16 April 2008); https://doi.org/10.1117/12.780602

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