Two integrating spheres have been developed to act as an interface between a monochromator and instruments under calibration. The spheres are designed to provide a diffuse extended source and attenuate the signal sufficiently so as not to saturate sensitive instruments. One sphere is coated with a BaSO4 paint which provides a diffuse highly reflecting surface in the 0.3- to 1.5-micron spectral region. This sphere is operated at ambient temperatures. The second sphere is peened to create a diffuse surface and then is coated with copper to obtain a high reflectivity from 1.5 to 8 microns. The latter sphere is cooled to liquid-nitrogen temperatures to eliminate self-radiation in the spectral region of interest. Comparisons between observed spectral performance and theoretically predicted results are presented, and the goniometric characteristics are described.
Modern utilization of infrared technology: Civilian and military
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- Infrared Radiometers;
- Infrared Spectrometers;
- Electromagnetic Absorption;
- Instrumentation and Photography