Phase 2 analysis of Spectralon material for use in on-board calibration systems for the medium-resolution imaging spectrometer (MERIS)

Leland, James E.; Arecchi, Angelo V.

doi:10.1117/12.211278

Cited by 8 publications

(5 citation statements)

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“…Overall, UV light exposure degrades the Spectralon reflectance more than the proton exposure for wavelength greater than 0.4 µm. Other experiments [14][15][16][17][18][19] also show similar magnitude of reflectance degradation after exposure to UV radiation. Recent experiment in [20] studied changes in the reflectance properties of pressed and sintered PTFE diffusers induced by exposure to VUV irradiation before and after controlled contamination with Pennzane.…”

Section: A3 Radiation Exposure Experiments On Sd Materialsmentioning

confidence: 67%

“…The SD is made of Spectralon TM (Fluorocarbon-based polymer) and designed to have the property of Lambertian reflectance (see Appendix A.1.). The spectral properties of SD reflectance inevitably degraded due to UV exposure and particle radiations in space [13][14][15][16][17][18][19][20], which are summarized in Appendixes A.2. and A.3.…”

Section: Model On Spectrally-dependent Scattering Over Rough Surfacesmentioning

confidence: 99%

“…Extensive experiments of particle and UV irradiation on SD material were performed [13][14][15][16][17][18][19][20] to study changes in directional-hemispheric spectral reflectance, the bidirectional spectral reflectance factor and the polarization properties of diffuser material after the radiation exposure. In early experiment of [13], optical-grade Spectralon material underwent proton exposure and UV-irradiation.…”

Section: A3 Radiation Exposure Experiments On Sd Materialsmentioning

confidence: 99%

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Spectral Dependent Degradation of the Solar Diffuser on Suomi-NPP VIIRS Due to Surface Roughness-Induced Rayleigh Scattering

2016

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Abstract:The Visible Infrared Imaging Radiometer Suite (VIIRS) onboard Suomi National Polar Orbiting Partnership (SNPP) uses a solar diffuser (SD) as its radiometric calibrator for the reflective solar band calibration. The SD is made of Spectralon™ (one type of fluoropolymer) and was chosen because of its controlled reflectance in the Visible/Near-Infrared/Shortwave-Infrared region and its near-Lambertian reflectance property. On-orbit changes in VIIRS SD reflectance as monitored by the Solar Diffuser Stability Monitor showed faster degradation of SD reflectance for 0.4 to 0.6 µm channels than the longer wavelength channels. Analysis of VIIRS SD reflectance data show that the spectral dependent degradation of SD reflectance in short wavelength can be explained with a SD Surface Roughness (length scale << wavelength) based Rayleigh Scattering (SRRS) model due to exposure to solar UV radiation and energetic particles. The characteristic length parameter of the SD surface roughness is derived from the long term reflectance data of the VIIRS SD and it changes at approximately the tens of nanometers level over the operational period of VIIRS. This estimated roughness length scale is consistent with the experimental result from radiation exposure of a fluoropolymer sample and validates the applicability of the Rayleigh scattering-based model. The model is also applicable to explaining the spectral dependent degradation of the SDs on other satellites. This novel approach allows us to better understand the physical processes of the SD degradation, and is complementary to previous mathematics based models.

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Section: A3 Radiation Exposure Experiments On Sd Materialsmentioning

confidence: 67%

Section: Model On Spectrally-dependent Scattering Over Rough Surfacesmentioning

confidence: 99%

Section: A3 Radiation Exposure Experiments On Sd Materialsmentioning

confidence: 99%

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Spectral Dependent Degradation of the Solar Diffuser on Suomi-NPP VIIRS Due to Surface Roughness-Induced Rayleigh Scattering

2016

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“…The degradation at 0.94µ should be the minimum in the SDSM monitoring range 6 . It is also known that the space-grade Spectralon® degrades more severely at wavelengths < 0.55µ.…”

Section: Alternative Approach For Sd Degradation Analysismentioning

confidence: 99%

“…20 bands (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19), and 26) with center wavelength below 2.2µ are known as the reflective solar bands (RSB). Other instruments on the Terra spacecraft include MISR, CERES, ASTER, and MOPITT.…”

Section: Introductionmentioning

confidence: 99%

Degradation of MODIS optics and its reflective solar bands calibration

Xiong

Esposito

Sun

et al. 2001

Sensors, Systems, and Next-Generation Satellites V

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The MODerate Resolution Imaging Spectroradiometer (MODIS) has 36 spectral bands with wavelength ranging from 0.41µ to 14.5µ and spatial resolution of 0.25km (2 bands), 0.5km (5 bands), and 1.0 km (29 bands) at Nadir. Its ProtoFlight Model (PFM) on the NASA EOS Terra spacecraft has been providing global coverage of the Land, Ocean, and Atmosphere for the science community since the instrument opened its Nadir door on 24 February 2000. The MODIS optical system includes a 2-sided paddle wheel scan mirror, a fold mirror, and a primary mirror. The sensor's 20 reflective solar bands (RSB) from 0.41µ to 2.1µ are calibrated on-orbit by a solar diffuser (SD) and a solar diffuser stability monitor (SDSM). In addition to the SD, degradation of the MODIS optics in the reflective solar bands has been observed, including variations in degradation between the two sides of the MODIS scan mirror. During MODIS first year of on-orbit operation, the overall degradation at the shortest wavelength of 0.41µ is about 2.5% for the SD, and in excess of 8% for the MODIS system. In this paper, we present our degradation analysis results and discuss their impact on the RSB on-orbit calibration.

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