Infrared Properties of Biological Materials of Interest to the Army
Final rept. May 1982-Dec 1985
SRI INTERNATIONAL MENLO PARK CA
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The purpose of this research was to establish the fundamental interaction between infrared IR radiation and biological materials so that the feasibility of using active and passive IR techniques for remote detection and alarm can be evaluated. Data concerning IR properties of biological materials may also be helpful in the development of techniques for identification of biological species. The objectives of this work were to 1 Measure the index of refraction of several biological materials in the wavelength region of 2 to 14 micron 2 Establish a data base of measured backscatter and extinction signatures as functions of wavelength for selected biological materials in the aerosol state 3 Compare measured backscatter and extinction signatures with values calculated using standard spherical and nonspherical particle theories to test the accuracy of these theories in calculating the IR properties of biological materials and 4 Investigate the ability to discriminate biological particles normally present in the atmosphere by observation and suitable processing of scattering and extinction data. We first investigated the IR differential scatter DISC technique for remote sensing of biological aerosols. We then investigated circular-intensity differential scattering CIDS for remote sensing of biological microorganisms.
- Chemical, Biological and Radiological Warfare
- Infrared Detection and Detectors