A spectral performance model for the High Resolution Dynamics Limb Sounder (6–18 μm)

Hawkins, Gary; Hunneman, Roger

doi:10.1016/s1350-4495(00)00039-6

Cited by 5 publications

(2 citation statements)

References 9 publications

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“…This model uses both the calculated and measured spectral characteristics of each optical train element to determine the integrated end-to-end spectral throughput. The results of the model demonstrate the predicted instrument level performance, from which the mean IB throughput response is determined [24] . The predicted instrument throughput was derived by combining the spectral R% or T% properties of the components along the optical train, assuming the absence of multiple beaming between elements.…”

Section: System Throughput Performancementioning

confidence: 69%

Infrared optical coatings for the EarthCARE Multispectral Imager

et al. 2014

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The Earth Cloud, Aerosol and Radiation Explorer mission (EarthCARE) Multispectral Imager (MSI) is a radiometric instrument designed to provide the imaging of the atmospheric cloud cover and the cloud top surface temperature from a sun-synchronous low Earth orbit. The MSI forms part of a suite of four instruments destined to support the European Space Agency Living Planet mission on-board the EarthCARE satellite payload to be launched in 2016, whose synergy will be used to construct three-dimensional scenes, textures, and temperatures of atmospheric clouds and aerosols. The MSI instrument contains seven channels: four solar channels to measure visible and short-wave infrared wavelengths, and three channels to measure infrared thermal emission. In this paper, we describe the optical layout of the infrared instrument channels, thin-film multilayer designs, the coating deposition method, and the spectral system throughput for the bandpass interference filters, dichroic beam splitters, lenses, and mirror coatings to discriminate wavelengths at 8.8, 10.8, and 12.0 μm. The rationale for the selection of thin-film materials, spectral measurement technique, and environmental testing performance are also presented.

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Section: System Throughput Performancementioning

confidence: 69%

Infrared optical coatings for the EarthCARE Multispectral Imager

et al. 2014

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“…Astronomical spectroscopy requires precise filtering to reject undesirable spectral radiation while maximizing the throughput within the required isolated passband. 1,2 Dichroic beamsplitters, or dichroics, are filters that rely on the optical interference occurring within thin-film layers to ensure the transmission and reflection of selective wavelengths from an incident light beam. They play a vital role in determining spectral response measurements and are, thus, critical optical components for selecting and isolating wavebands for astronomical observation.…”

Section: Introductionmentioning

confidence: 99%

Extreme broadband dichroics: Monte Carlo transmission line modeling for astronomical spectroscopy

Thurairethinam,

Savini,

Hawkins

et al. 2024

J. Astron. Telesc. Instrum. Syst.

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Dichroic beamsplitters, or dichroics, rely on the optical interference that occurs within thin-film layers to ensure the separation of the transmission and reflection of selective wavelengths of an incident beam of light at a given angle of incidence. Utilized within the optical systems of numerous space telescopes, they act to separate the incoming light spectrally and spatially into various channels. As space missions increasingly demand simultaneous observations across wavebands spanning extreme wavelength ranges, the necessity for exceedingly complex broadband dichroics has emerged. Subsequently, the uncertainties pertaining to their optical performance have also become more intricate. We use transmission line modeling to evaluate the spectral performance of multilayer coatings deposited on a substrate material for given thicknesses, materials, angles of incidence, and polarization. A dichroic recipe in line with the typical specifications and requirements of a dichroic is designed with the aid of a Monte Carlo simulation. The tolerances of the coating performance to systematic and random uncertainties from the manufacturing process, as well as from environmental changes in space, are studied. With the aid of accurate manufacturing recipes and uncertainty amplitudes from commercial manufacturers, this tool can predict variations in the optical performance that result from the propagation of each of these uncertainties for various hypothetical scenarios and systematic effects.

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