Calibration of the Spectral Radiance of a Low Current Carbon Arc between 185 nm and 340 nm

1978 ◽  
Vol 33 (4) ◽  
pp. 502-504 ◽  
Author(s):  
D. Einfeld ◽  
D. Stuck
Keyword(s):  
Synchrotron Radiation ◽  
Wavelength Range ◽  
Spectral Range ◽  
Spectral Radiance ◽  
Electron Synchrotron ◽  
Carbon Arc ◽  
Arc Current

The spectral radiance Lλ of a low current carbon arc (current 7.3 amps, voltage 65 V) has been calibrated in the spectral range from the air cut-off (λ ≈ 185 nm) to 340 nm with an uncertainty of ± 3% utilizing the electron synchrotron radiation of DESY, Hamburg. In the wavelength range above 260 nm these values differ by less than ± 6% from the measurements of Magdeburg and Schurer.

On the Use of a Low Current Argon Arc with a MgF2-Window as a VUV-Transfer Standard of the Spectral Radiance (125nm≦λ≦335nm)

1979 ◽  
Vol 34 (2) ◽  
pp. 233-238 ◽  
Author(s):  
D. Einfeld ◽  
K. Grützmacher ◽  
D. Stuck
Keyword(s):  
Wavelength Range ◽  
Optical System ◽  
Operating Time ◽  
Spectral Radiance ◽  
Transmission Factor ◽  
Power Requirement ◽  
Electron Synchrotron ◽  
Order Of Magnitude ◽  
Carbon Arc ◽  
Arc Current

Abstract The spectral radiance Lλ (λ) of a low current argon arc (current: 10 A, power requirement: ≦1.5 kW, pressure: 1.2 bar, gas: A) has been calibrated with a relative uncertainty of 5% in the wavelength range between 125 nm and 335 nm by means of the electron synchrotron radiation of DESY (Hamburg, Germany). Lλ (λ) exceeds generally the spectral radiance of the carbon arc and the commercially available deuterium lamps by more than one order of magnitude. A significant reduction of the transmittance τ(λ) of the MgF2-window, inserted for the sealing of the arc chamber has been observed in the entire wavelength range when the low current argon arc has been flanged to a vuv-optical system. The behaviour of the transmission factor of the MgF2-window under the influence of increasing times of exposure to arc radiation has been investigated as a function of wavelength. The reduction of the transmission factor of the MgF2-window in the uv (λ > 185 nm) is nearly negligible ( < 2 % over an operating time of 30 hours) when the arc has been utilized without a connection to a vuv-optical system

Notizen: Comparison of Synchrotron Radiation and Hydrogen Continuum Radiation in the Near VUV by Means of a Deuterium Transfer Standard

1976 ◽  
Vol 31 (9) ◽  
pp. 1131-1132
Author(s):  
D. Einfeld ◽  
D. Stüde ◽  
K. Behringer ◽  
P. Thoma
Keyword(s):  
High Temperature ◽  
Synchrotron Radiation ◽  
Spectral Range ◽  
Indirect Comparison ◽  
Spectral Radiance ◽  
Electron Synchrotron ◽  
Continuum Radiation ◽  
Transfer Standard ◽  
Deuterium Lamp ◽  
The Continuum

Abstract The spectral radiance of a deuterium lamp has been calibrated by the radiation of an electron synchrotron and by the continuum radiation of a high temperature hydrogen arc. The two measurements allow an indirect comparison of the two radiometric standards in the spectral range from 175 to 340 nm. They agree with each other within less than ± 5%.

Results of Spatial Structure of Atmosphere Radiation in a Spectral Range (1.5–2) µm Research

2018 ◽  
pp. 7-13
Author(s):  
Anton M. Mishchenko ◽  
Sergei S. Rachkovsky ◽  
Vladimir A. Smolin ◽  
Igor V . Yakimenko
Keyword(s):  
Spatial Structure ◽  
Unmanned Aerial Vehicle ◽  
Wavelength Range ◽  
Spectral Range ◽  
Near Ir ◽  
Optoelectronic Systems ◽  
Aerial Vehicle

Results of experimental studying radiation spatial structure of atmosphere background nonuniformities and of an unmanned aerial vehicle being the detection object are presented. The question on a possibility of its detection using optoelectronic systems against the background of a cloudy field in the near IR wavelength range is also considered.

Characterization of III-nitride Based Schottky UV Detectors with Wide Detectable Wavelength Range (360–10 nm) using Synchrotron Radiation

2003 ◽  
Vol 798 ◽  
Author(s):  
Atsushi Motogaito ◽  
Kazumasa Hiramatsu ◽  
Yasuhiro Shibata ◽  
Hironobu Watanabe ◽  
Hideto Miyake ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
Schottky Barrier ◽  
Wavelength Range ◽  
Epitaxial Layer ◽  
Device Performance ◽  
Uv Detectors ◽  
X Ray ◽  
High Responsivity ◽  
Vacuum Uv

ABSTRACTCharacterizations of transparent Schottky barrier GaN and AlGaN UV detectors in the vacuum UV (VUV) and soft X-ray (SX) region using synchrotron radiation are described. In the GaN UV detectors, the responsivity achieved about 0.05 A/W at 95 eV (13 nm). Thus, their device performance is shown between 3.4 and 100 eV (10 and 360 nm). Furthermore, the high responsivity spectra were realized by using AlGaN Schottky UV detectors consisting of Al0.5Ga0.5N on AlN epitaxial layer.

scholarly journals The Zugspitze radiative closure experiment for quantifying water vapor absorption over the terrestrial and solar infrared – Part 2: Accurate calibration of high spectral-resolution infrared measurements of surface solar radiation

2016 ◽  
Vol 9 (9) ◽  
pp. 4673-4686 ◽  
Author(s):  
Andreas Reichert ◽  
Markus Rettinger ◽  
Ralf Sussmann
Keyword(s):  
Water Vapor ◽  
Spectral Range ◽  
High Spectral Resolution ◽  
Spectral Radiance ◽  
Transfer Model ◽  
Water Vapor Absorption ◽  
Absorption Bands ◽  
Model Calculations ◽  
Infrared Measurements ◽  
Vapor Absorption

Abstract. Quantitative knowledge of water vapor absorption is crucial for accurate climate simulations. An open science question in this context concerns the strength of the water vapor continuum in the near infrared (NIR) at atmospheric temperatures, which is still to be quantified by measurements. This issue can be addressed with radiative closure experiments using solar absorption spectra. However, the spectra used for water vapor continuum quantification have to be radiometrically calibrated. We present for the first time a method that yields sufficient calibration accuracy for NIR water vapor continuum quantification in an atmospheric closure experiment. Our method combines the Langley method with spectral radiance measurements of a high-temperature blackbody calibration source (<  2000 K). The calibration scheme is demonstrated in the spectral range 2500 to 7800 cm−1, but minor modifications to the method enable calibration also throughout the remainder of the NIR spectral range. The resulting uncertainty (2σ) excluding the contribution due to inaccuracies in the extra-atmospheric solar spectrum (ESS) is below 1 % in window regions and up to 1.7 % within absorption bands. The overall radiometric accuracy of the calibration depends on the ESS uncertainty, on which at present no firm consensus has been reached in the NIR. However, as is shown in the companion publication Reichert and Sussmann (2016), ESS uncertainty is only of minor importance for the specific aim of this study, i.e., the quantification of the water vapor continuum in a closure experiment. The calibration uncertainty estimate is substantiated by the investigation of calibration self-consistency, which yields compatible results within the estimated errors for 91.1 % of the 2500 to 7800 cm−1 range. Additionally, a comparison of a set of calibrated spectra to radiative transfer model calculations yields consistent results within the estimated errors for 97.7 % of the spectral range.

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