Flight model characterization of the wide-field off-axis telescope for the MATS satellite

Woojin Park, Arvid Hammar, Soojong Pak, Seunghyuk Chang, Jörg Gumbel, Linda Megner, Ole Martin Christensen, Jordan Rouse, Dae Wook Kim

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


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.

Original languageEnglish (US)
Pages (from-to)5335-5342
Number of pages8
JournalApplied optics
Issue number17
StatePublished - Jun 10 2020

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Engineering (miscellaneous)
  • Electrical and Electronic Engineering


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