The constant of grating is one of the most important parameters to assess the quality of grating.
光栅常数是检验光栅质量的重要参数之一。
Time grating displacement sensor is working on theory of time-space coordinate transformation, which need constitute a moving coordinate with constant velocity V.
基于时空坐标转换理论而研制的时栅位移传感器实现了以时间测量空间，但关键是要构建一个以恒速V运动的坐标系。
The method of using CCD to measure the constant of hologram grating in real-time when the grating is under manufacturing is discussed.
本文讨论了在制造全息光栅过程中，CCD实时测量全息光栅常数的方法。
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