Investigating Chromatic Confocal Imaging

Wiersma, Gideon (2025) Investigating Chromatic Confocal Imaging. Bachelor's Thesis, Physics.

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Abstract

Schut Geometrical Metrology specializes in 3D coordinate measuring machines. To expand Schut's capabilities, this thesis investigates a novel technique called chromatic confocal imaging. In this technique, a small part of a measurement sample is imaged onto a pinhole. Due to chromatic aberrations, a distance-dependent spectrum is isolated, which allows for distance measurement. A prototype will be suggested and tested simulation-wise. This study will investigate what configuration (pinhole size, aperture size, etc.) maximizes measurement accuracy. The simplified version assumes a measurement sample with only a small illuminated area. It will therefore be investigated how the size of this area influences the measurement accuracy. This study focuses on two aspects of the set-up: the diameter of the aperture that is placed before the first lens and diameter of the pinhole that filters the light. It is found that, with the applied simplifications, an aperture diameter of 25 mm maximizes measurement accuracy. Furthermore, it is found that the pinhole diameter is inversely proportional to measurement accuracy but also inversely proportional to the signal strength of the detector. Therefore two prototypes are suggested: one that prioritizes signal strength and another that maximizes measurement accuracy. The pinholes diameter of these prototypes are 0.2 mm and 0.02 mm respectively.

Item Type:	Thesis (Bachelor's Thesis)
Supervisor name:	Hoekstra, S. and Jones, S.A.
Degree programme:	Physics
Thesis type:	Bachelor's Thesis
Language:	English
Date Deposited:	16 Jul 2025 06:52
Last Modified:	16 Jul 2025 06:52
URI:	https://fse.studenttheses.ub.rug.nl/id/eprint/36272

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