It is a special application to establish a long optical reference for measuring relative Angle between measurement instruments in optical engineering.
建立测量仪器之间相对角度测量用的长的光学参考基准，是光学工程中的一种特殊应用。
Two instruments were involved in producing the map: the camera instrument (specifically the Wide Angle camera) and the Lunar Orbiter Laser Altimeter (Lola) instrument.
制作这份地图利用到两种仪器：相机设备(特别是广角相机)和月球轨道激光测高仪(萝拉)。
The way of calculating the parameters of modulus, pressure angle and helix angle of the gear masters that are used to calibrate gear instruments is in detail in this paper.
本文详细介绍了用于齿轮仪器校准的齿轮样板模数、压力角、螺旋角等参数计算方法。
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