信息科学与工程
YANG Liang;SHEN Xiangheng;ZHANG Ning;ZHAO Yuyan
Journal of Shenyang University of Technology.
2011, 33(1):
97-101.
For the importance of measuring accurately the angular rate in the performance evaluation of rotary table, a highspeed video method for measuring the angular rate of rotary table was proposed. A collimator tube was fixed to the rotary table as a measureable objective, and the space position of the objective was corresponding to the rotating angular position of the table. In the rotating process of rotary table, the objective space position was recorded with a highspeed camera and thus the measurement was implemented. The orientation method with the pixel subdivision technology was adopted to improve the measurement precision, where the subdivision precision could reach 0.03 pixels. This method was used to collect and analyze the test data for a certain type of lowspeed rotary table. The error analysis result shows that the precision of rate measurement can reach 3.405×10-4 when the angular rate of rotary table is 0.2°/s. It means that the present method can be used for measuring the angular rate of highprecision rotary table. The instantaneous angular rate of rotary table can be measured due to the high sampling frequency of highspeed camera. The objective evaluation for the angular rate of rotary table is realized with the noncontact 〖JP〗measurement way in the proposed method.