对于球面光学红外探测器，视场总是循环。
For infrared detectors with spherical optics, the field of view is always circular.
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。
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.
利用四路红外非制冷焦平面探测器、大视场光学系统、窄带滤光片和信号处理系统，构成了凝视成像激光探测与告警系统。
A staring imaging laser detecting and warning system is formed by using 4-channel uncooled infrared focal plane detectors, large field optical system, narrow band filters and signal processing system.
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