Time resolved characterization of stray light

Lionel Clermont; Wilfried Uhring; Marc P. Georges

doi:10.1117/12.2593370

20 June 2021 Time resolved characterization of stray light

Lionel Clermont, Wilfried Uhring, Marc P. Georges

Proceedings Volume 11782, Optical Measurement Systems for Industrial Inspection XII; 1178211 (2021) https://doi.org/10.1117/12.2593370
Event: SPIE Optical Metrology, 2021, Online Only

Abstract

Traditional approach to stray light characterization is intrinsically limited. While the stray light level in an optical instrument can be measured, it is not possible to derive from experimental measurements the origin of the different features. Consequently, when unexpectedly high stray light is present, it is extremely difficult to find how to improve the system. In this paper, we introduce a new method where a pulsed laser and an ultra-fast sensor is used. As different stray light contributors have different optical path lengths, they reach the detector at different times and resolving them temporally allows to measure them separately. Their origin can be retrieved by using the optical path length as a mean of identification. We present the conceptual study and the experimental proof of concept of this new method. We were able to characterize individually the different stray light components in an imaging system and determine their origin. We show how the measurements allow to reverse engineer the instrument properties and even verify sub-system requirements.

Conference Presentation

Citation Download Citation

Lionel Clermont, Wilfried Uhring, and Marc P. Georges "Time resolved characterization of stray light", Proc. SPIE 11782, Optical Measurement Systems for Industrial Inspection XII, 1178211 (20 June 2021); https://doi.org/10.1117/12.2593370

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