现有的装置靠的是亮度差别，可靠性差。
The excising device is based on the brightness difference, and the reliability is bad.
五面镜更便宜更轻，但是成像的质量和亮度差。
This is cheaper and lighter, but generally produces a viewfinder image of lower quality and brightness.
在采用NETD计算红外热像仪的探测距离时，需要计算目标在热像仪探测波段范围内的辐射亮度差。
When the detection range of the IR thermal imager is calculated by using NETD, the target radiation brightness difference must be calculated in the operating wave band.
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