A novel method for roll measurement based on grating

作者：Zhai Yusheng^*; Feng Qibo; Zhang Bin

来源：Acta Optica Sinica, 2008, 28(SUPPL. 2): 112-116.

• Anti interferences
• Calibration curves
• Double optical paths differential measurement
• Focusing lenses
• Grating
• Linear dependencies
• Measurement based
• Measuring units
• Novel methods
• Pitch angles
• Roll angle
• Straightness errors
• Yaw angles

A novel method for roll measurement is presented based on one-dimensional grating. The effects of straightness errors are avoided by using the measuring unit consisting of a focusing lens and photodetector. This method realizes errors separation, avoiding crosstalk of pitch angle and yaw angle, and enhances the ability of anti-interference by adopting double optical paths differential measurement based on the ±1 order diffractive beams. Feasibility of the method is analyzed in detail. Calibration curve, whose linear dependency is 1, is obtained by experiment. The results show that resolution of the rolling error is less than 0.6″. The method is simple and flexible enough to meet the different accuracy demands just by choosing the different gratings.

• 出版日期2008
• 单位北京交通大学