Integrating sphere performance in the 0.3 to 8 micron spectral region
Abstract
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.
- Publication:
-
Modern utilization of infrared technology: Civilian and military
- Pub Date:
- 1975
- Bibcode:
- 1975SPIE...62..135C
- Keywords:
-
- Calibrating;
- Infrared Radiometers;
- Infrared Spectrometers;
- Monochromators;
- Reflectometers;
- Spheres;
- Electromagnetic Absorption;
- Goniometers;
- Reflectance;
- Transmissivity;
- Instrumentation and Photography