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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics

| EXPLORING THE INTERFACE OF LIGHT AND BIOMEDICINE

  • Editors: Andrew Dunn and Anthony Durkin
  • Vol. 7, Iss. 11 — Oct. 31, 2012

Using near infrared measurement of water content as a cue for detecting biological materials

Gerald McGunnigle  »View Author Affiliations


Applied Optics, Vol. 51, Issue 25, pp. 6095-6105 (2012)
http://dx.doi.org/10.1364/AO.51.006095


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Abstract

This paper uses the spectral characteristics of water as a cue to detect biological materials in a scene. The spectra of a wide variety of materials were measured; most of the biological materials showed a spectral feature corresponding to the absorption peak of water at 962 nm. A machine vision system that used two narrowband near infrared light sources and a conventional CCD camera is described. The ability of the system to detect biological material is demonstrated in a series of examples. Water content is not an infallible indicator that a material is biological—wet inanimate surfaces will give a false positive, and some tissues are surrounded by highly scattering, impermeable layers that conceal internal water. Nonetheless, in this paper, we will show that many tissues do give a strong response to this feature and dry, nonbiological materials do not.

© 2012 Optical Society of America

OCIS Codes
(150.0150) Machine vision : Machine vision
(150.2945) Machine vision : Illumination design

ToC Category:
Vision, Color, and Visual Optics

History
Original Manuscript: May 18, 2012
Revised Manuscript: July 21, 2012
Manuscript Accepted: July 25, 2012
Published: August 27, 2012

Virtual Issues
Vol. 7, Iss. 11 Virtual Journal for Biomedical Optics

Citation
Gerald McGunnigle, "Using near infrared measurement of water content as a cue for detecting biological materials," Appl. Opt. 51, 6095-6105 (2012)
http://www.opticsinfobase.org/vjbo/abstract.cfm?URI=ao-51-25-6095

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