Reducing the uncertainty of laser straightness measurements via local saturation of imaging sensors

This paper investigates causes of center detection errors in laser straightness measurements for precision positioning applications and proposes the calibration of these errors by utilizing the reversal method after reducing the center detection uncertainty. The uncertainty arising from unknown imag...

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Bibliographic Details
Published in2024 IEEE International Conference on Advanced Intelligent Mechatronics (AIM) pp. 1567 - 1572
Main Authors Hager, Stefan, Csencsics, Ernst, Yoo, Han Woong, Schitter, Georg
Format Conference Proceeding
LanguageEnglish
Published IEEE 15.07.2024
Subjects
Imaging
machine calibration
Measurement by laser beam
Measurement uncertainty
Pollution measurement
Shape
spot center detection
straightness measurement
Systematics
Uncertainty
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Summary:This paper investigates causes of center detection errors in laser straightness measurements for precision positioning applications and proposes the calibration of these errors by utilizing the reversal method after reducing the center detection uncertainty. The uncertainty arising from unknown imaging errors, such as spatially varying pixel sensitivity and sensor pollution, is diminished by saturating the imaging sensor. The results demonstrate that the uncertainty can be reduced by a factor of 4.8, from 2.19 \mu \mathrm{m} to 0.45 \mu \mathrm{m}. This reduction justifies the application of the reversal method to calibrate the remaining center detection error, attributed to the shape of the laser beam cross-section in the image. Consequently, this enables straightness measurements with a repeatability of 0.34 \mu \mathrm{m}.
ISSN:2159-6255
DOI:10.1109/AIM55361.2024.10637144