EVALUATION OF THE ALBEDO INTEGRAL FOR MARK 1
ARNOLD ENGINEERING DEVELOPMENT CENTER ARNOLD AFB TN
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This report is concerned with the development of a fast computer method for evaluating the albedo integral. This integral defines the illumination on an arbitrarily oriented surface element at any point in space about a diffusely reflecting sphere. It enters the calculation of simulation control parameters in the Arnold Engineering Development Center Aerospace Environmental Chamber Mark I. The seminumerical method developed here is faster than ordinary numerical integration by a factor of about ten. A typical computer program, which formerly required about thirty minutes, now produces the same results in under four minutes.
- Test Facilities, Equipment and Methods