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Xiao He

at Shanghai Institute of Technical Physics

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Proceedings Article | 5 August 2009 Paper

Numerical computation of modulated factor in measuring D*

Xiangrong He, Yan Zhang, Yani Zhang, Hengjing Tang

Proceedings Volume 7383, 738316 (2009) https://doi.org/10.1117/12.835707

KEYWORDS: Modulation, Sensors, Black bodies, MATLAB, Interference (communication), Transducers, Physics, Amplifiers, Signal detection, Infrared imaging

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The "direct current" radiation is turned to periodic "alternating current" radiation by the modulate tray, then, the periodic "alternating current" radiation is received by photoelectric detector in one constant frequency during measuring D*. The ratio is called modulated factor, which the ratio is the fundamental virtual factor of "alternating current" radiant power to "direct current" radiant power. The modulated factor is an important parameter in measuring D*. The modulated factor could be gained by analytic method or numerical computation method. In this paper, by the method of numerical computation and Matlab program, the authors give out modulated factor of a light-spot modulated by a fan-shaped modulate tray. The modulated factor is different from r, R, n. Some conclusions that we are using in measuring D* are testified. When the light-spot and the detector are at the same axis and L≥10 √A_b (A_b is the area of the light-spot), the diameter of the light-spot is 0.87 of the width of fan-shaped modulate tray dentition, the modulated factor is 0.3536.

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