Performance measurement of high precision optical assemblies for cosmological observations: comparison of different approaches

Chr. Bodendorf; A. Bode; N. Geis; D. Penka; F. Grupp; R. Bender

doi:10.1117/12.2235210

30 June 2016 Performance measurement of high precision optical assemblies for cosmological observations: comparison of different approaches

Chr. Bodendorf, A. Bode, N. Geis, D. Penka, F. Grupp, R. Bender

Author Affiliations +

Proceedings Volume 10009, Third European Seminar on Precision Optics Manufacturing; 100090F (2016) https://doi.org/10.1117/12.2235210
Event: Third European Seminar on Precision Optics Manufacturing, 2016, Teisnach, Germany

Abstract

Euclid is the name of a space telescope currently being developed in the framework of the ESA Cosmic Vision 2015- 2025 Program [1], [2]. It addresses cosmological questions related to dark matter and dark energy. The lens system of one of the two scientific key instruments on board of Euclid (a combined near-infrared spectrometer and photometer) is designed and tested at the Max Planck Institute for Extraterrestrial Physics.

In this paper, we compare two complementary approaches to determine the imaging quality of the photometer. The first approach is based on a direct camera measurement of the point-spread function (PSF) while the second approach uses a Shack-Hartmann sensor to reconstruct the wave front of the system.

Both methods yield in principle largely overlapping information in terms of e.g. modulation transfer function (MTF), encircled energy (EE) or spot shape. However, the experimental requirements are quite different. Details like the spatial extent and coherence properties of the object have different impact and are essential for the degree of agreement between both approaches. Moreover, the disturbance due to measurement noise is quite unequal and requires different evaluation steps.

The pros and cons of both methods that actually complement one another are investigated and discussed.

Citation Download Citation

Chr. Bodendorf, A. Bode, N. Geis, D. Penka, F. Grupp, and R. Bender "Performance measurement of high precision optical assemblies for cosmological observations: comparison of different approaches", Proc. SPIE 10009, Third European Seminar on Precision Optics Manufacturing, 100090F (30 June 2016); https://doi.org/10.1117/12.2235210

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