从光学指标的确定，结构、材料的选取到最终光学性能，阐述了准直投射光学系统的设计。
The projection optics is designed for a constant field angle and entrance pupil. Thus image always fills entrance aperture and view field of the test optical system.
系统经外场实际测试的结果表明，使用了金属反射镜的红外热成像系统达到了光学系统的设计指标。
The environmental and the actual condition tests show that the infrared system with metallic mirrors has met the requirement of optical design.
镀膜玻璃可见光透射比是其光学特性的重要指标之一。
Visible light transmittance of coated glass is one of the important indexes of optical properties.
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