Characteristics Of A Simple Blackbody Measurement System

C. Fu; N. H. Anger; R. Kaehms; K. B. Jaeger

doi:10.1117/12.947144

14 July 1988 Characteristics Of A Simple Blackbody Measurement System

C. Fu, N. H. Anger, R. Kaehms, K. B. Jaeger

Proceedings Volume 0940, Infrared Scene Simulation: Systems, Requirements, Calibration, Devices, and Modeling; (1988) https://doi.org/10.1117/12.947144
Event: 1988 Technical Symposium on Optics, Electro-Optics, and Sensors, 1988, Orlando, FL, United States

Abstract

In this paper we consider an axially symmetric blackbody (BB) measurement system with a circular aperture and a circular detector. The BB can be of a right circular conical shape, a right cylindrical shape, or a combination of these two shapes. Assuming that the BB is ideal, we calculate the power received by the detector. Using the axial symmetry we reduce the results to products of a single integral, involving Planck's distribution and the spec-tral response of the detector, and a double integral with variable limits of integration. The latter integral, called "system geometry factor (SGF)", depends on the geometry of the BB, the sizes of the aperture and the detector, and the distance of the detector from the aperture plane. When the aperture and the detector are sufficiently small and the distance between them is large enough, the SGF can be calculated as if the BB cavity were an extended source over the aperture or a point source situated at the center of the aperture. The SGF can be used in many situations. As illustrations, we show how the exact calculation and the approximations can be used for designing a test, and for checking the effectiveness of a BB or the whole measurement system. We also discuss the uncertainty relationship between the BB temperature and its radiant power measurements and how it is used in different practical cases.

Citation Download Citation

C. Fu, N. H. Anger, R. Kaehms, and K. B. Jaeger "Characteristics Of A Simple Blackbody Measurement System", Proc. SPIE 0940, Infrared Scene Simulation: Systems, Requirements, Calibration, Devices, and Modeling, (14 July 1988); https://doi.org/10.1117/12.947144

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