Precise uniform light source based on optically connected integrating spheres for optical instrument calibration

Leonid Mikheenko; Volodymyr Borovytsky

doi:10.1117/12.892757

16 September 2011 Precise uniform light source based on optically connected integrating spheres for optical instrument calibration

Leonid Mikheenko, Volodymyr Borovytsky

Author Affiliations +

Proceedings Volume 8154, Infrared Remote Sensing and Instrumentation XIX; 815419 (2011) https://doi.org/10.1117/12.892757
Event: SPIE Optical Engineering + Applications, 2011, San Diego, California, United States

Abstract

The paper proposes the uniform light sources which have a form of several or multiple optically connected integrating spheres. The principal advantages of these light sources are high photometric and metrological characteristics. As a result they have good perspectives in optical radiometry and calibration of imaging systems and optical instruments. The principal field of their application is calibration of remote sensing instruments and sensitive megapixel cameras. The light source contains several (3 ... 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. It is investigated the light source design with an output aperture diameter 0.2 m and 3 or 5 primary integrating spheres. It guarantees the output radiance in range from 0.01 to 1000 W/(st•m²), radiance uniformity bigger 99.5% in an output aperture, non-linearity of an output radiance control - smaller 0.1 %. The paper presents the results of theoretical and experimental research of these light sources including the techniques for radiance calculation and the recommendations for light source design. The proposed light sources can be considered as one of the best candidates for calibration of remote sensing instruments working in optical range 0.4 - 2.2 mkm. Key words: integrating sphere, light source, calibration, uniformity, radiance, remote sensing, optical instrument.

Citation Download Citation

Leonid Mikheenko and Volodymyr Borovytsky "Precise uniform light source based on optically connected integrating spheres for optical instrument calibration", Proc. SPIE 8154, Infrared Remote Sensing and Instrumentation XIX, 815419 (16 September 2011); https://doi.org/10.1117/12.892757

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