Development of Fast and Precise Scan Mirror Mechanism for an Airborne Solar Telescope

Oba, Takayoshi; Shimizu, Toshifumi; Katsukawa, Y.; Kubo, Masahito; Kawabata, Yusuke; Hara, Hirohisa; Uraguchi, Fumihiro; Tsuzuki, Toshihiro; Tamura, Takuya; Shinoda, Kazuya; Kodeki, Kazuhide; Fukushima, Kazuhiko; Fernández, José Miguel Morales; Gómez, Antonio Sánchez; Jiménez, M. Balaguer; Expósito, D. Hernández; Gandorfer, A.

doi:10.1007/s11207-022-02044-y

Cited by 1 publication

(1 citation statement)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…1. The onboard data processing, camera exposures, and scan mirror mechanism (SMM) 17 , 18 synchronously co-operate with the polarization modulation unit (PMU) 19 , 20 in the observing sequence. The PMU continuously rotates a pair of waveplates at a constant rate of 0.512 s/rotation and sends a pulse (“phase signal from polarization modulator unit” in Fig.…”

Section: Introductionmentioning

confidence: 99%

High-speed data processing onboard sunrise chromospheric infrared spectropolarimeter for the SUNRISE III balloon telescope

Kubo,

Katsukawa,

Hernández Expósito

et al. 2023

J. Astron. Telesc. Instrum. Syst.

Self Cite

View full text Add to dashboard Cite

The Sunrise Chromospheric Infrared spectroPolarimeter (SCIP) has been developed for the third flight of the SUNRISE balloon-borne stratospheric solar observatory. The aim of the SCIP is to reveal the evolution of three-dimensional magnetic fields in the solar photosphere and chromosphere using spectropolarimetric measurements with a polarimetric precision of 0.03% (1σ). Multiple lines in the 770 and 850 nm wavelength bands are simultaneously observed with two 2 k × 2 k CMOS cameras at a frame rate of 31.25 Hz. Stokes profiles are calculated onboard by accumulating the images modulated by a polarization modulation unit, and then compression processes are applied to the two-dimensional maps of the Stokes profiles. This onboard data processing effectively reduces the data rate. SCIP electronics can handle large data formats at high speed. Before the implementation into the flight SCIP electronics, a performance verification of the onboard data processing was performed with synthetic SCIP data that were produced with a numerical simulation modeling the solar atmospheres. Finally, we verified that the high-speed onboard data processing was realized on ground with the flight hardware using images illuminated by natural sunlight or an LED light.

show abstract