The Emirates Mars Mission (EMM) Emirates Mars InfraRed Spectrometer (EMIRS) Instrument

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作者
Christopher S. Edwards
Philip R. Christensen
Greg L. Mehall
Saadat Anwar
Eman Al Tunaiji
Khalid Badri
Heather Bowles
Stillman Chase
Zoltan Farkas
Tara Fisher
John Janiczek
Ian Kubik
Kelly Harris-Laurila
Andrew Holmes
Igor Lazbin
Edgar Madril
Mark McAdam
Mark Miner
William O’Donnell
Carlos Ortiz
Daniel Pelham
Mehul Patel
Kathryn Powell
Ken Shamordola
Tom Tourville
Michael D. Smith
Nathan Smith
Rob Woodward
Aaron Weintraub
Heather Reed
Emily B. Pilinski
机构
[1] Northern Arizona University,Department of Physics and Astronomy
[2] Arizona State University,School of Earth and Space Exploration
[3] Emirates Institute for Advanced Science and Technology,Mohammed bin Rashid Space Center
[4] Arizona Space Technologies,Laboratory for Atmospheric and Space Physics
[5] Goddard Space Flight Center,undefined
[6] University of Colorado Boulder,undefined
来源
Space Science Reviews | 2021年 / 217卷
关键词
Mars; Atmosphere; EMM; Emirates Mars Infrared Spectrometer;
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摘要
The Emirates Mars Mission Emirates Mars Infrared Spectrometer (EMIRS) will provide remote measurements of the martian surface and lower atmosphere in order to better characterize the geographic and diurnal variability of key constituents (water ice, water vapor, and dust) along with temperature profiles on sub-seasonal timescales. EMIRS is a FTIR spectrometer covering the range from 6.0-100+ μm (1666-100 cm−1) with a spectral sampling as high as 5 cm−1 and a 5.4-mrad IFOV and a 32.5×32.5 mrad FOV. The EMIRS optical path includes a flat 45° pointing mirror to enable one degree of freedom and has a +/- 60° clear aperture around the nadir position which is fed to a 17.78-cm diameter Cassegrain telescope. The collected light is then fed to a flat-plate based Michelson moving mirror mounted on a dual linear voice-coil motor assembly. An array of deuterated L-alanine doped triglycine sulfate (DLaTGS) pyroelectric detectors are used to sample the interferogram every 2 or 4 seconds (depending on the spectral sampling selected). A single 0.846 μm laser diode is used in a metrology interferometer to provide interferometer positional control, sampled at 40 kHz (controlled at 5 kHz) and infrared signal sampled at 625 Hz. The EMIRS beamsplitter is a 60-mm diameter, 1-mm thick 1-arcsecond wedged chemical vapor deposited diamond with an antireflection microstructure to minimize first surface reflection. EMIRS relies on an instrumented internal v-groove blackbody target for a full-aperture radiometric calibration. The radiometric precision of a single spectrum (in 5 cm−1 mode) is <3.0×10−8 W cm−2 sr−1/cm−1 between 300 and 1350 cm−1 over instrument operational temperatures (<∼0.5 K NEΔ\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$\Delta $\end{document}T @ 250 K). The absolute integrated radiance error is < 2% for scene temperatures ranging from 200-340 K. The overall EMIRS envelope size is 52.9×37.5×34.6 cm and the mass is 14.72 kg including the interface adapter plate. The average operational power consumption is 22.2 W, and the standby power consumption is 18.6 W with a 5.7 W thermostatically limited, always-on operational heater. EMIRS was developed by Arizona State University and Northern Arizona University in collaboration with the Mohammed bin Rashid Space Centre with Arizona Space Technologies developing the electronics. EMIRS was integrated, tested and radiometrically calibrated at Arizona State University, Tempe, AZ.
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