Flatness can be determined by covering a surface with an potically flat glass.
用一光学平面玻璃覆盖一个表面，可以测量平整度。
In practice, two semisilvered or aluminized glass optical flats from the reflecting boundary surface.
实际上，两块半镀银的或镀铝的光学平面玻璃构成了反射界面。
flat optical tool
光学玻璃平面研磨盘
velvet-finish glass
细毛面玻璃，珍珠光玻璃，丝光玻璃
Here the interference pattern is established between an optical flat and the polished specimen surface of the glass.
在光学平板玻璃和磨光试样表面之间建立起干涉图样。
unmounted optical flat, of any material (excl. non-optically worked glass)
未装配的光学平玻璃,任何材料（不包括未经光学加工的玻璃）
float and polished plate glass
浮法玻璃和抛光平板玻璃
Lead and cadmium in optical and filter glass.
光学玻璃及滤光玻璃中所用的铅及镉。
glass plate, coated with metal on one surface (i.e., glass mirrors)
平板玻璃,一面涂有金属（即玻璃镜）
Analysis of Long-period Gratings in Er-Yb Doped Phosphate Glass Slab Wageduides
Er-Yb掺杂磷酸盐玻璃平面波导长周期光栅分析
transparency area
(座舱)玻璃[透光]面积
Glass has a smooth surface.
玻璃有光滑的表面。
The surface of the glass is very smooth.
玻璃的表面很光滑。
Colourless optical glass
GB/T903-1987无色光学玻璃
selected chunks
经挑选的光学玻璃块
pot transfer glass
坩埚中冷却的光学玻璃
Research on Aspheric Profile of Optical Glass with Numerical Control Grinding Technology;
光学玻璃非球面廓形的数控磨削技术研究
Colourless optical glass test methods--Test method by collimator for optical homogeneity
GB/T7962.2-1987无色光学玻璃测试方法光学均匀性平行光管测试方法