Improved alignment of the setup for traceable measurements of the modulation transfer function (MTF)

Hanno Dierke; Markus Schake

doi:10.1117/12.2673632

15 August 2023 Improved alignment of the setup for traceable measurements of the modulation transfer function (MTF)

Hanno Dierke, Markus Schake

Proceedings Volume 12618, Optical Measurement Systems for Industrial Inspection XIII; 1261815 (2023) https://doi.org/10.1117/12.2673632
Event: SPIE Optical Metrology, 2023, Munich, Germany

Abstract

At PTB, a modulation transfer function (MTF) measurement setup is developed for the traceable determination of the MTF of lenses and objectives. In recent works the MTF of a reference objective has been determined within the image field in an angular range of up to θ = ±20° to the optical axis. The measurements have shown characteristic deviations that presumably were caused by misalignments of parts of the setup. Thus, the procedure for the alignment of the setup components has been improved and new results with strongly decreased influence of misalignments are obtainable. Furthermore, the investigation of the angular dependency of the MTF for a given spatial frequency requires a datum point as a fixed reference. A common choice of the datum point is the focus point P_f. Different methods to obtain the focus point from the measurement data are investigated and show a varying repeatability in the determination of the focus point P_f. In this contribution the recently improved procedure used for the measurement setup alignment is described. New measurement results are presented and the contributions of misalignments to the MTF results is discussed. In addition, several approaches for the determination of the focus point are presented and rated with respect to their repeatability.

Conference Presentation

Citation Download Citation

Hanno Dierke and Markus Schake "Improved alignment of the setup for traceable measurements of the modulation transfer function (MTF)", Proc. SPIE 12618, Optical Measurement Systems for Industrial Inspection XIII, 1261815 (15 August 2023); https://doi.org/10.1117/12.2673632

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