A Portable Instrument for Simultaneous Recording of Scene Composition and Spectral Reflectance

Abstract

A battery-powered scene recording radiometer system has been developed for relating spectral variability and target composition. A remote controlled filter wheel radiometer is interfaced with a Hasselblad 500 EL camera, so that the silicon detector is directed toward the camera's viewing glass. Signal detection at discrete wavelength bands is achieved by successively rotating interchangeable interference filters that interdict the view of the detector. Filter positioning is controlled by coding holes drilled in the filter wheel disk which are interpreted by a bank of opposing light emitting diodes and phototransistors. Upon obtaining a photographic record of the scene, the camera is automatically advanced.`