High precision and thermally controlled Filter Wheel

Sánchez, Antonio; Gonzalo, Alejandro; Garranzo, Daniel; Silva-López, Manuel; Hernandez, Hugo Laguna; Cebollero, María; Fernández-Medina, Ana; Alvarez-Herrero, A.

doi:10.1117/12.2629408

Cited by 2 publications

(1 citation statement)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition, it was observed that the higher the tuning Angle Of Incidence (AOI) of the NBF, the higher the MTF decay. One possible explanation is related to the method used to hold the NBFs in the Filter Wheel 13 used to insert them in the optical path which could have introduced certain deformations in them. The image Strehl ratio, R, was calculated as the ratio between the actual MTF values obtained with the slit target images and the TuMag diffraction MTF, according to the following equation.…”

Section: Image E2e Test Resultsmentioning

confidence: 99%

End-to-end tests of the TuMag instrument for the SUNRISE III mission

Alvarez-Herrero¹,

Garranzo²,

Silva-López³

et al. 2022

Ground-Based and Airborne Instrumentation for Astronomy IX

Self Cite

View full text Add to dashboard Cite

SUNRISE III mission is a one-meter aperture telescope onboard a balloon within NASA Long Duration Balloon Program. Three post-focus instruments are used for studying the Sun's dynamics and magnetism, among which the Tunable Magnetograph (TuMag) is a tunable imaging spectropolarimeter.TuMag is a diffraction-limited imager, a high sensitivity polarimeter (< 10 -3 ), and a high-resolution spectrometer ( ~ 65 mÅ). It will be able to study solar magnetic fields at high spatial resolution (~100 km on the solar surface). It will make images of the solar surface magnetic field after measuring the state of polarization of light within three selected spectral lines: the Fe I lines at 525.02 nm and 525.06 nm, and the Mg I b2 line at 517.27 nm. It will be sensitive to the solar vector magnetic fields and line-of-sight velocities, in the photospheric and chromospheric layers. TuMag will be the first solar magnetograph onboard an aerospace platform with the capability of tuning the solar line to be observed.In this paper the TuMag end-to-end tests carried out during the verification phase are described. These tests are performed to characterize and calibrate the instrument. Specifically, they determine the polarimetric and spectroscopic performances of the instrument as well as the image quality. The availability of a singular facility, an ISO6 clean room with a coelostat on the building roof, allowed the use of solar light during the verification campaign. This was key to a complete instrument verification due to the unique spectroscopic and polarimetric characteristics of solar light.

show abstract

Section: Image E2e Test Resultsmentioning

confidence: 99%