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估计热成象系统的性能,由于必须计算普朗克辐射函数对温度导数的积分,所以很复杂。当系统使用光子探测器时,可用Sanderson 提出的近似法,根据辐射计算尺求得的函数计算这个积分。目标和背景温度接近300K 时,在14微米以内都可以使用这种近似法,这种近似法是大有用处的。这个报导表明,所求的积分可以写成用辐射计算尺能取得的项,而不用近似法,因而应用计算尺就可对全部背景温度和波长间隔作性能估计。而且这个方法可以应用于用热探测器的系统以及用光子探测器的系统。
Estimating the performance of a thermal imaging system is complicated by the need to calculate the integral of the Planck's radiation function over the temperature derivative. When the system uses photon detectors, the approximation method proposed by Sanderson can be used to calculate this integral according to the function of radiation calculation rule. This approximation can be useful when the target and background temperatures are close to 300K, all within 14 microns. This report shows that the integrals obtained can be written as radiometric rulers without the use of approximations, so that a full scale background temperature and wavelength separation can be estimated using a slide rule. And this method can be applied to a system with a heat detector and a system using a photon detector.