Forskning ved Københavns Universitet - Københavns Universitet

Forside

An Instrument Anomaly in the Mars Exploration Rover Pancam 1,009-nm Filter (R7): Characterization, Simulation, Correction, and Preliminary Verification

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningfagfællebedømt

Standard

An Instrument Anomaly in the Mars Exploration Rover Pancam 1,009-nm Filter (R7) : Characterization, Simulation, Correction, and Preliminary Verification. / Jakobsen, Simone J.; Kinch, Kjartan M.; Madsen, Morten Bo; Bell, James F.; Wellington, Danika; Dajose, Lorinda; Alizai, Khaled.

I: Earth and Space Science, Bind 6, Nr. 1, 01.01.2019, s. 96-115.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningfagfællebedømt

Harvard

Jakobsen, SJ, Kinch, KM, Madsen, MB, Bell, JF, Wellington, D, Dajose, L & Alizai, K 2019, 'An Instrument Anomaly in the Mars Exploration Rover Pancam 1,009-nm Filter (R7): Characterization, Simulation, Correction, and Preliminary Verification', Earth and Space Science, bind 6, nr. 1, s. 96-115. https://doi.org/10.1029/2018EA000473

APA

Jakobsen, S. J., Kinch, K. M., Madsen, M. B., Bell, J. F., Wellington, D., Dajose, L., & Alizai, K. (2019). An Instrument Anomaly in the Mars Exploration Rover Pancam 1,009-nm Filter (R7): Characterization, Simulation, Correction, and Preliminary Verification. Earth and Space Science, 6(1), 96-115. https://doi.org/10.1029/2018EA000473

Vancouver

Jakobsen SJ, Kinch KM, Madsen MB, Bell JF, Wellington D, Dajose L o.a. An Instrument Anomaly in the Mars Exploration Rover Pancam 1,009-nm Filter (R7): Characterization, Simulation, Correction, and Preliminary Verification. Earth and Space Science. 2019 jan 1;6(1):96-115. https://doi.org/10.1029/2018EA000473

Author

Jakobsen, Simone J. ; Kinch, Kjartan M. ; Madsen, Morten Bo ; Bell, James F. ; Wellington, Danika ; Dajose, Lorinda ; Alizai, Khaled. / An Instrument Anomaly in the Mars Exploration Rover Pancam 1,009-nm Filter (R7) : Characterization, Simulation, Correction, and Preliminary Verification. I: Earth and Space Science. 2019 ; Bind 6, Nr. 1. s. 96-115.

Bibtex

@article{53ed26fa85ad465fb10adedb2dd83ce7,
title = "An Instrument Anomaly in the Mars Exploration Rover Pancam 1,009-nm Filter (R7): Characterization, Simulation, Correction, and Preliminary Verification",
abstract = " During pre-flight calibration of the panoramic camera (Pancam) instrument on board the Mars Exploration Rovers MER A (Spirit) and MER B (Opportunity), a discrepancy was noted between 11-band spectra extracted from Pancam images of the camera's radiometric calibration target and reflectance spectra obtained with a spectrometer. This discrepancy was observed in the longest-wavelength filter of the camera (the longpass R7 filter with system λ eff  = 1,009 nm) and consisted of a reduction in contrast between bright and dark regions. Here we describe and characterize this effect. We propose that the effect arises because long-wavelength photons close to the silicon band-gap at 1,100 nm are allowed through the R7 filter, pass through the bulk charge-coupled device, scatter from the backside, pass through the charge-coupled device again, and are registered in a pixel other than the pixel through which they originally entered. Based on this hypothesis we develop a model capable of accurately simulating the effect, and correct for it. We present preliminary results from testing this correction on preflight, as well as in-flight, images. The effect is small, but in some specific cases in small regions of high contrast, the effect is significant. In in-flight images of Martian terrain we observed the signal in dark shadows to be artificially inflated by up to ∼ 33% and analysis of early-mission calibration target images indicated that the reduced contrast due to the artifact is equivalent to >100 DN (full well = 4095 DN) for a hypothetical perfectly dark pixel. ",
keywords = "calibration, CCD, Mars, MER, multispectral, Pancam",
author = "Jakobsen, {Simone J.} and Kinch, {Kjartan M.} and Madsen, {Morten Bo} and Bell, {James F.} and Danika Wellington and Lorinda Dajose and Khaled Alizai",
year = "2019",
month = jan,
day = "1",
doi = "10.1029/2018EA000473",
language = "English",
volume = "6",
pages = "96--115",
journal = "Earth and Space Science",
issn = "2333-5084",
publisher = "American Geophysical Union",
number = "1",

}

RIS

TY - JOUR

T1 - An Instrument Anomaly in the Mars Exploration Rover Pancam 1,009-nm Filter (R7)

T2 - Characterization, Simulation, Correction, and Preliminary Verification

AU - Jakobsen, Simone J.

AU - Kinch, Kjartan M.

AU - Madsen, Morten Bo

AU - Bell, James F.

AU - Wellington, Danika

AU - Dajose, Lorinda

AU - Alizai, Khaled

PY - 2019/1/1

Y1 - 2019/1/1

N2 - During pre-flight calibration of the panoramic camera (Pancam) instrument on board the Mars Exploration Rovers MER A (Spirit) and MER B (Opportunity), a discrepancy was noted between 11-band spectra extracted from Pancam images of the camera's radiometric calibration target and reflectance spectra obtained with a spectrometer. This discrepancy was observed in the longest-wavelength filter of the camera (the longpass R7 filter with system λ eff  = 1,009 nm) and consisted of a reduction in contrast between bright and dark regions. Here we describe and characterize this effect. We propose that the effect arises because long-wavelength photons close to the silicon band-gap at 1,100 nm are allowed through the R7 filter, pass through the bulk charge-coupled device, scatter from the backside, pass through the charge-coupled device again, and are registered in a pixel other than the pixel through which they originally entered. Based on this hypothesis we develop a model capable of accurately simulating the effect, and correct for it. We present preliminary results from testing this correction on preflight, as well as in-flight, images. The effect is small, but in some specific cases in small regions of high contrast, the effect is significant. In in-flight images of Martian terrain we observed the signal in dark shadows to be artificially inflated by up to ∼ 33% and analysis of early-mission calibration target images indicated that the reduced contrast due to the artifact is equivalent to >100 DN (full well = 4095 DN) for a hypothetical perfectly dark pixel.

AB - During pre-flight calibration of the panoramic camera (Pancam) instrument on board the Mars Exploration Rovers MER A (Spirit) and MER B (Opportunity), a discrepancy was noted between 11-band spectra extracted from Pancam images of the camera's radiometric calibration target and reflectance spectra obtained with a spectrometer. This discrepancy was observed in the longest-wavelength filter of the camera (the longpass R7 filter with system λ eff  = 1,009 nm) and consisted of a reduction in contrast between bright and dark regions. Here we describe and characterize this effect. We propose that the effect arises because long-wavelength photons close to the silicon band-gap at 1,100 nm are allowed through the R7 filter, pass through the bulk charge-coupled device, scatter from the backside, pass through the charge-coupled device again, and are registered in a pixel other than the pixel through which they originally entered. Based on this hypothesis we develop a model capable of accurately simulating the effect, and correct for it. We present preliminary results from testing this correction on preflight, as well as in-flight, images. The effect is small, but in some specific cases in small regions of high contrast, the effect is significant. In in-flight images of Martian terrain we observed the signal in dark shadows to be artificially inflated by up to ∼ 33% and analysis of early-mission calibration target images indicated that the reduced contrast due to the artifact is equivalent to >100 DN (full well = 4095 DN) for a hypothetical perfectly dark pixel.

KW - calibration

KW - CCD

KW - Mars

KW - MER

KW - multispectral

KW - Pancam

U2 - 10.1029/2018EA000473

DO - 10.1029/2018EA000473

M3 - Journal article

AN - SCOPUS:85060625943

VL - 6

SP - 96

EP - 115

JO - Earth and Space Science

JF - Earth and Space Science

SN - 2333-5084

IS - 1

ER -

ID: 214515638