STUDY AND PERFORMANCE EVALUATION OF COLOR CODING RETICLE.
Final rept. 1 Jul 63-31 Mar 64,
AEROJET-GENERAL CORP AZUSA CALIF
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The purpose was to demonstrate the increased capabilities and uses of infrared measurement systems equipped with a color coding reticle. The CCR is an interference device used to convert an optical spectrum into an analogous frequency spectrum -- i.e., to encode color or wavelength information as frequency. The CCR principle entails moving a wedge of germanium through a pencil of rays from a collecting optical system such that the interference between reflections from the two surfaces provides the wavelength-dependent modulation mechanism. The germanium Ge wedge is deposited on the surface of a transparent substrate disc in the form of two half circle ramps. This configuration presents a constantly varying thickness of Ge to the incident radiation by simply rotating the substrate disc. The CCR was incorporated into an existing Aerojet radiometer Model M4X. The germanium deposition techniques resulted in a color coding reticle with a spectral resolution of a fractional bandwidth ranging from approximately 3 at 1.8 microns to 9 at 5 microns.
- Radiofrequency Wave Propagation