With the help of a precise angle-measuringdevice, the apex Angle and the minimum deviation Angle of the prism can be measured; hence the optical refractive index of the glass.
借助高精度的测角仪器，就可测量棱镜的顶角和最小偏向角，从而得到光学玻璃的折射率。
2
In order to study dynamic stall phenomena of an aircraft in portrait at a high Angle of attack, designing a measuringdevice of heave oscillation for a low speed wind tunnel.
为了研究飞行器在纵向大迎角状态下的动态失速现象，设计了一套用于低速风洞的升沉振动测量装置。
3
Photoelectric rotary encoder, which is also called photoelectric angel position sensor, is a kind of digital anglemeasuringdevice combining optics, mechanics and electronics.