Certain applications in imaging photometry and radiometry require a telescope–detector system with (preferably constant) response over a wide spectral range from the ultraviolet through the infrared. We describe the design and characterization of the Solar Bolometric Imager (SBI), a 30-cm-aperture Dall–Kirkham telescope combined with a gold-blacked, 80, 000-element thermal array detector. Our SBI prototype provides spectrally uniform imaging in total solar light (0.28–2.6 μm) of heat-flow inhomogeneities at the solar photosphere, with better than 5-arc sec angular resolution over a 6.5 × 13 arc min field of view. A balloon-borne SBI would avoid most atmospheric transmission variation over this spectral range, enabling accurate study of the sources of total irradiance variation.
© 2001 Optical Society of America
(040.1240) Detectors : Arrays
(120.5240) Instrumentation, measurement, and metrology : Photometry
(350.1260) Other areas of optics : Astronomical optics
(350.1270) Other areas of optics : Astronomy and astrophysics
(350.6090) Other areas of optics : Space optics
Peter Foukal and Scott Libonate, "Total-Light Imager with Flat Spectral Response for Solar Photometric Measurements," Appl. Opt. 40, 1138-1146 (2001)