Flight model characterization of the wide-field off-axis telescope for the MATS satellite
Journal article, 2020

We present optical characterization, calibration, and performance tests of the Mesospheric Airglow/Aerosol Tomography Spectroscopy (MATS) satellite, which for the first time, to the best of our knowledge, for a satellite, applies a linear-astigmatism-free confocal off-axis reflective optical design. Mechanical tolerances of the telescope were investigated using Monte Carlo methods and single-element perturbations. The sensitivity analysis results indicate that tilt errors of the tertiary mirror and a surface RMS error of the secondary mirror mainly degrade optical performance. From the Monte Carlo simulation, the tolerance limits were calculated to ±0.5 mm, ±1 mm, and ±0.15◦ for decenter, despace, and tilt, respectively. We performed characterization measurements and optical tests with the flight model of the satellite. Multi-channel relative pointing, total optical system throughput, and distortion of each channel were characterized for end-users. Optical performance was evaluated by measuring the modulation transfer function (MTF) and point spread function (PSF). The final MTF performance was 0.25 MTF at 20 lp/mm for the ultraviolet channel (304.5 nm), and 0.25-0.54 MTF at 10 lp/mm for infrared channels. The salient fact of the PSF measurement of this system is that there is no noticeable linear astigmatism detected over a wide field of view (5.67◦ × 0.91◦). All things considered, the design method showed great advantages in wide field of view observations with satellite-level optical performance.


Woojin Park

Kyung Hee University

Arvid Hammar

Omnisys Instruments

Soojong Pak

Kyung Hee University

Seunghyuk Chang

Center for Integrated Smart Sensors

J. Gumbel

Stockholm University

L. Megner

Stockholm University

Ole Martin Christensen

Chalmers, Space, Earth and Environment, Microwave and Optical Remote Sensing

Stockholm University

Jordan Rouse

Omnisys Instruments

Dae Wook Kim

University of Arizona

Applied Optics

1559-128X (ISSN) 2155-3165 (eISSN)

Vol. 59 17 5335-5342

Subject Categories


Medical Laboratory and Measurements Technologies

Atom and Molecular Physics and Optics



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