If the hot surface is smaller than the field of view of the infrared detector, not so much energy enters into the opening of the infrared detector as would be possible under full illumination.
如果热表面比红外探测器的视场，没有那么多的精力小全光照下进入到作为有可能红外探测器开幕。
3
Then the derivation of local illumination source is reported, the near-field electromagnetic scattering characteristics of some electrically large structures are calculated and analyzed.