Calibration of MAJIS (Moons and Jupiter Imaging Spectrometer). IV. Radiometric calibration (invited).

IF 1.3 4区 工程技术 Q3 INSTRUMENTS & INSTRUMENTATION
Y Langevin, F Poulet, G Piccioni, G Filacchione, C Dumesnil, F Tosi, J Carter, A Barbis, P Haffoud, L Tommasi, M Vincendon, S De Angelis, I Guerri, C Pilorget, S Rodriguez, S Stefani, D Bolsée, M Cisneros, L Van Laeken, N Pereira, A Carapelle
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引用次数: 0

Abstract

The MAJIS (Moons and Jupiter Imaging Spectrometer) instrument is an imaging spectrometer on-board the JUICE (JUpiter ICy moons Explorer) spacecraft. MAJIS covers the spectral range from 0.5 to 5.54 μm with two channels [visible-near infrared (VISNIR) and IR]. A comprehensive campaign of on-ground MAJIS calibration was conducted in August and September 2021 in the IAS (Institut d'Astrophysique Spatiale, CNRS/Université Paris-Saclay) facilities. In this article, we present the results relevant for the radiometric calibration of MAJIS. Due to the specific characteristics of the MAJIS detectors (H1RG from Teledyne), an extensive detector characterization campaign was implemented for both the VISNIR and IR detectors before integration so as to validate readout procedures providing precision and accuracy. The characterization also provided critical information on linearity and operability as a function of the integration time and operating temperature. The radiometric calibration of the integrated MAJIS instrument focused on the determination of the instrument transfer function in terms of DN output per unit of radiance for each MAJIS data element as a function of its position in the field of view of MAJIS and its central wavelength. The radiometric calibration of the VISNIR channel required a specific procedure due to stray light at short wavelengths. Observations of an internal calibration source during calibration and after launch (April 14, 2023) showed that there were minor changes in both the VISNIR and IR channels. The instrument transfer functions to be used in flight have been updated on this basis.

MAJIS(卫星和木星成像分光计)的校准。IV.辐射校准(特邀)。
MAJIS(卫星和木星成像分光计)仪器是 JUICE(JUpiter ICy moons Explorer)航天器上的一个成像分光计。MAJIS 的光谱范围为 0.5 至 5.54 μm,有两个通道[可见光-近红外(VISNIR)和红外]。2021 年 8 月和 9 月,在 IAS(法国国家科学研究中心天体物理空间研究所/巴黎萨克雷大学)的设施中进行了一次全面的 MAJIS 地面校准活动。本文将介绍 MAJIS 辐射校准的相关结果。由于 MAJIS 探测器(Teledyne 公司的 H1RG)的特殊性,在整合之前对 VISNIR 和 IR 探测器进行了广泛的探测器特性分析,以验证读出程序的精度和准确性。特征描述还提供了有关线性和可操作性的重要信息,这些信息是积分时间和工作温度的函数。综合 MAJIS 仪器的辐射校准重点是确定仪器的传递函数,即每个 MAJIS 数据元素每单位辐照度的 DN 输出量与其在 MAJIS 视场中的位置和中心波长的函数关系。由于短波长的杂散光,VISNIR 频道的辐射校准需要一个特定的程序。在校准期间和发射后(2023 年 4 月 14 日)对内部校准源的观测表明,可见近红外和红外通道都有细微变化。在此基础上,对飞行中使用的仪器传递函数进行了更新。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Review of Scientific Instruments
Review of Scientific Instruments 工程技术-物理:应用
CiteScore
3.00
自引率
12.50%
发文量
758
审稿时长
2.6 months
期刊介绍: Review of Scientific Instruments, is committed to the publication of advances in scientific instruments, apparatuses, and techniques. RSI seeks to meet the needs of engineers and scientists in physics, chemistry, and the life sciences.
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