Chemical Detection in SWIR

Different chemicals absorb light differently in the SWIR spectrum.  One can use these various absorption spectra to differentiate chemical types.  In the example below broad band light is used to image four chemicals.  All four chemical looks like clear liquid in the visible.  Using broad band SWIR light one can see light is absorbed differently leading to the chemicals appearing different (darker or lighter).   Using a prism or spectrometer to seperate the light into individual wavelengths allows one to find the chemical fingerprint for many species in the SWIR band. 

Imagery taken with 1280SCICAM and Optec 25mm F1.4 SWIR lens.

Application Videos

  • Acetone and Water with LineCam12

    The LineCam12, a 1024x1 linear array camera, is imaging acetone and water.  Both are clear liquids in the visible but in the SWIR band the water goes dark.  The SWIR band is excellent for detecting water because it is very absorbing. This camera can see visible light and SWIR light simultaneously.  The light source made by Metaphase Technologies has both visible and SWIR sources.  We switch between them and the camera can see both wavelength bands.  The camera images light from 0.4 to 1.7μm.

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