Error corrections for position sensitive detector based on speckle tracking system

Shuai Hongjun; Zhang Shuai; Song Jiantao; Zhang Jianhua

doi:10.3788/IRLA201645.0417002

The accuracy of position sensitive detector(PSD) is mainly affected by the non-linearity, interference and the installation tilt error, and the measurable range is limited by the size of the detector. Based on the analysis of the influencing mechanism of the non-linearity, the interference and the installation tilt error, a speckle tracking system was introduced to remove the influence by local fitting and real-time calibration according to the linear relationship between the actual value and the measured value. Al2O3/PEN sample was used to experimentally verify the designed spot tracking system platform. The results show that the linear correlation coefficient maintains in a range of 10.001 5, the linearity standard error is reduced to 0.3 m/40 mm, the maximum error is less than 16 m/40 mm and the measurable range can be increased to the stroke of the module, 200 mm in this work. This method is effective, flexible and practical for position detection applications especially under feeble light condition and for large measuring range.

Error corrections for position sensitive detector based on speckle tracking system

1. School of Mechatronics and Automation,Shanghai University,Shanghai 200072,China;

2. Key Laboratory of Advanced Display and System Applications,Ministry of Education,Shanghai University,Shanghai 200072,China

Received Date: 2015-08-25

Rev Recd Date: 2015-09-13

Publish Date: 2016-04-25

Key words:

Abstract: The accuracy of position sensitive detector(PSD) is mainly affected by the non-linearity, interference and the installation tilt error, and the measurable range is limited by the size of the detector. Based on the analysis of the influencing mechanism of the non-linearity, the interference and the installation tilt error, a speckle tracking system was introduced to remove the influence by local fitting and real-time calibration according to the linear relationship between the actual value and the measured value. Al2O3/PEN sample was used to experimentally verify the designed spot tracking system platform. The results show that the linear correlation coefficient maintains in a range of 10.001 5, the linearity standard error is reduced to 0.3 m/40 mm, the maximum error is less than 16 m/40 mm and the measurable range can be increased to the stroke of the module, 200 mm in this work. This method is effective, flexible and practical for position detection applications especially under feeble light condition and for large measuring range.

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Reference (12)

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Error corrections for position sensitive detector based on speckle tracking system

doi: 10.3788/IRLA201645.0417002

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