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Note: Intensity control of a phase-shift based laser scanner for reducing distance errors caused by varying surface reflectivity

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3 Author(s)
Jang, Junhwan ; Department of Mechatronics, Gwanju Institute of Science and Technology, 123 Cheomdan-gwagiro (Oryong-dong), Buk-gu, Gwanju, 500-712, South Korea ; Hwang, Sungui ; Kyihwan Park

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In the phase-shift measurement method, the distance traveled by light can be obtained on the basis of the phase difference between the reference signal and the measured signal. When a different colored object is measured, the intensity of the measured signal varies greatly, even at the same distance, which causes a different phase delay owing to the wide dynamic range input into the signal processing circuit. In this study, an intensity control method is proposed to solve this phase delay problem.

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Review of Scientific Instruments  (Volume:82 ,  Issue: 12 )