Design of the precise uniform light source based on optically connected integrating spheres for VIIR calibration

Mikheenko, Leonid; Borovytsky, Volodymyr N.; Mironovich, Valentine

doi:10.1117/12.2061925

Cited by 1 publication

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“…This apparatus has helped to get data about sensitivity of the output radiance to variation of the ISs parameters (1) and to find the technique for identification of the optimal parameters of the light source 16,17 .…”

Section: Fig 1 Principal Scheme Of An Integrating Multi Spherementioning

confidence: 99%

Precise prelaunch radiometric calibration of VIIRs

Mikheenko

Borovytsky

Hudz

2015

Earth Observing Systems XX

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The paper presents the new approach that includes technique, scheme and instruments for precise calibration of space-borne and airborne visible infrared imaging radiometers (VIIRs). The key component of this technique is the precise uniform light source based on optically-interconnected integrating spheres. The light source contains several (5…11) primary integrating spheres of small diameters which are installed on a secondary integrating sphere of bigger diameter. The initial light sources -halogen lamps or light emitted diodes are installed inside the primary integrating spheres. These spheres are mounted on the secondary integrating sphere. The radiation comes from the primary integrating spheres to the secondary one through diaphragms which diameters can be varied. The secondary integrating sphere has an output aperture where uniform radiance emits. As a result the output radiance can be varied in extremely wide range -up to 800 W/(st·m 2 ) with dynamic range 1 000 000 -without any change of spectral characteristics. Non-uniformity of the radiance distribution throughout the output aperture can be smaller 0.5 % because the secondary integrating sphere is illuminated uniformly and it does not contain lamps inside. The paper discusses the requirements to calibration system, the application of this light source in calibration procedures, metrological aspects of radiometric calibration.

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Section: Fig 1 Principal Scheme Of An Integrating Multi Spherementioning

confidence: 99%