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| The Method of Calibrating Rotating Angle of Goniophotometer using Laser Tracker |
| CHEN Ting,ZHOU Weng-qing,YE Huai-chu,LU Xin,YE Xin,MAO Zhen-hua |
| Zhejiang Institute of Metrology, Hangzhoug, Zhejiang 310018, China |
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Abstract The photometric characteristic of light source is the important parameter in lamp and lantern design and the production processes, while goniophotometer is the key equipment to measure the candela distribution curve. The precision of rotating angle of γ-axis and C-axis in goniophotometer has an important influence on goniophotometry measurement, and those angles cannot be calibrated by the conventional angle measuring instrument because those angles are formed by virtual trajectories in space. The laser tracker is used to measure the rotating angle in space. First, the factors affecting the measurement precision are analyzed, then the measurement parameters of laser tracker are optimized. Later, the 3-D measuring points are transformed to 2-D plane by coordinate conversion. Finally, the angle values are calculated by software and compared with the values read by goniophotometer, so the calibration result is obtained.
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2014, Vol. 35 
