Shortwave Infrared Spectroradiometer for Atmospheric Transmittance Measurements

Sicard, Michaël; Thome, Kurtis J.; Crowther, Blake G.; Smith, Mark W.

doi:10.1175/1520-0426(1998)015<0174:sisfat>2.0.co;2

Cited by 7 publications

(8 citation statements)

References 14 publications

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“…Short‐wave infrared (SWIR) typically refers to the photons in the wavelength range from 1 to 3 micrometers. Applications in this wavelength window exploit various advantages such as long penetration length in biological tissue, spectral coverage of the atmospheric nightglow, and the characteristic excitation energy of certain molecular vibration modes . SWIR photodetectors are thus the key technological components to achieve optical communication, environmental gas sensing, biodiagnostics, and passive night vision .…”

Section: Introductionmentioning

confidence: 99%

“…Applications in this wavelength window exploit various advantages such as long penetration length in biological tissue, spectral coverage of the atmospheric nightglow, and the characteristic excitation energy of certain molecular vibration modes. [1][2][3] SWIR photodetectors are thus the key technological components to achieve optical communication, environmental gas sensing, biodiagnostics, and passive night vision. [4] Current SWIR technologies mainly rely on low-bandgap compound semiconductors, such as InGaAs, InSb, PbS, and HgCdTe.…”

Section: Introductionmentioning

confidence: 99%

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Short‐Wave Infrared Sensor by the Photothermal Effect of Colloidal Gold Nanorods

Xiang

Niu

Sebag

et al. 2018

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Photodetection in the short-wave infrared (SWIR) spectrum is a challenging task achieved often by costly low bandgap compound semiconductors involving highly toxic elements. In this work, an alternative low-cost approach is reported for SWIR sensors that rely on the plasmonic-induced photothermal effect of solution-processed colloidal gold nanorods (Au NRs). A series of uniform solution-processed Au NRs of various aspect ratios are prepared exhibiting a strong and well-defined longitudinal localized surface plasmon resonance (L-LSPR) maximum from 900 nm to 1.3 µm. A hybrid device structure is fabricated by applying Au NRs on the surface of a thermistor. Under a monochromatic illumination, hybrid Au-NR/thermistor devices exhibit a clear photoresponse in the form of photoinduced resistance drop in the wavelength window from 1.0 to 1.8 µm. The photoresponsivity of such hybrid devices reaches a maximum value of 4.44 × 10 Ω W at λ = 1.4 µm (intensity = 0.28 mW cm ), a wavelength in agreement with the L-LSPR of the Au NRs applied. Colloidal Au NRs, capable to perform fast conversion between photon absorption and thermal energy, thus open an interesting avenue for alternative low-cost SWIR photodetection.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Short‐Wave Infrared Sensor by the Photothermal Effect of Colloidal Gold Nanorods

Xiang

Niu

Sebag

et al. 2018

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“…The method is generally applied to a monochromatic radiance signal, the change of which is modeled following the Beer-Bouguer-Lambert law. 22 The most important assumption is that the atmosphere does not change with time, and it is common practice to perform these measurements from sunrise to sunset and obtain a large variation in air mass values. Note that extension of the measurements to low Sun altitudes requires careful modeling of the observed radiance, which can no longer be accounted for by considering a plane-parallel atmosphere.…”

Section: B Radiometric Calibrationmentioning

confidence: 99%

“…A high altitude calibration site at which these measurements can be performed helps to mitigate the possible inaccuracy of radiance theoretical modeling and the effects of atmospheric turbulence. 22 Application of this kind of calibration procedure to our instrument requires knowledge of a reliable theoretical signal model that describes the evolution of monochromatic irradiance during the day as a function of the Sun's position ͑relative air mass in the direct light path͒. The free parameters of the model are then assessed with a fitting algorithm by use of experimental data.…”

Section: B Radiometric Calibrationmentioning

confidence: 99%

Solar spectral irradiometer for validation of remotely sensed hyperspectral data

et al. 2004

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A new solar spectral irradiometer that operates in the visible and near-infrared spectral ranges has been developed. This instrument takes advantage of a new concept optical head that collects the light that impinges on a hemispheric surface, thus improving the instrument angular response with respect to traditional devices. The technical characteristics of the instrument are investigated and detailed, and its radiometric calibration, performed by means of a Langley-like method, is discussed. A new simplified theoretical model that accounts for the diffuse irradiance observed in an optically thin plane-parallel atmosphere has been developed to improve the fit of the irradiance diurnal evolution. An alternative polynomial parametric representation of monochromatic diffuse irradiance evolution has been attempted, but satisfactory results were not obtained from the fitting of experimental data. The new instrument could be useful to carry out remote-sensing validation campaigns.

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“…Irradiance measurements of higher spectral resolution are mostly restricted to ground-based instruments (Harrison et al, 1999;Meywerk and Ramanathan, 1999;Michalsky et al, 1999;Wendisch et al, 2001) and to the ultraviolet or near-infrared spectral range (e.g. Ramaswamy and Freidenreich, 1998;Sicard et al, 1998). Spectral actinic irradiances, which are related to the surface of a unit sphere instead of a horizontal unit area like in the case of common irradiances, are also mostly measured at the ground (Hofzumahaus et al, 1999).…”

Section: Introductionmentioning

confidence: 99%