Radiometric calibrations of portable sources in the vacuum ultraviolet

Klose, Jules Z.; Bridges, J. M.; Ott, William R.

doi:10.6028/jres.093.004

Cited by 24 publications

(15 citation statements)

References 16 publications

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“…For calibration in absolute intensity an Optronics OL550 Tungsten ribbon lamp was used for wavelengths above 400 nm. An argon mini-arc discharge, with calibration traceable to NIST standards between 120 and 400 nm [35], was used for wavelengths below 400 nm. In order to calibrate the system using the argon discharge, a modification of the VUV system was required.…”

Section: Vuv Spectrometermentioning

confidence: 99%

“…The uncertainty bounds on the SPECAIR calculations correspond to the minimum and maximum values based upon the uncertainty in the temperature measurement. The uncertainty for the experimental value is estimated to be primarily from the reported uncertainty of the calibration source (±5%, [35]). The total uncertainty for the experimental value is estimated at ±6% or ± 36 mW/cm 2 /sr.…”

Section: Vuv Measurementsmentioning

confidence: 99%

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Measurements and modeling of CO 4th positive (A–X) radiation

McGuire

Tibère-Inglesse

Mariotto

et al. 2020

Journal of Quantitative Spectroscopy and Radiative Transfer

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We present absolute intensity measurements of CO 4th positive emission from a CO 2 /Ar plasma jet produced using an atmospheric pressure plasma torch facility. The centerline temperature of the plasma jet is approximately 6300 K. A VUV emission spectroscopy system was adapted to the plasma torch facility to measure spectrally resolved emission down to 140 nm. The emission from the plasma in the VUV, UV and near IR is consistent with thermochemical equilibrium. Carbon lines in the UV and VUV are found to be optically thick and their amplitude is therefore substantially affected by the line broadening parameters used for the calculation. For the CO 4th positive emission, these measurements test the performance of various models for the electronic transition moment function (ETMF). These ETMFs are used to calculate sets of Einstein coefficients that are used by SPECAIR to calculate the spectrally resolved emission of the plasma for comparison with experiments. We find that the EMTF of Kirby and Cooper and Spielfiedel accurately reproduce the measured emission from 150 -215 nm.

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Section: Vuv Spectrometermentioning

confidence: 99%

Section: Vuv Measurementsmentioning

confidence: 99%

Measurements and modeling of CO 4th positive (A–X) radiation

McGuire

Tibère-Inglesse

Mariotto

et al. 2020

Journal of Quantitative Spectroscopy and Radiative Transfer

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“…Examples include argon arcs (Bridges and Ott 1977), bare metal photoemissive diodes (Saloman 1978), D 2 lamps (Klose et al 1988), tungsten-filament incandescent lamps (Waters et al 1988), hollow-cathode (Danzmann et al 1988;Hollandt et al 1994) and Penning (Heise et al 1994) discharges, and silicon trap detectors (Goebel et al 1996) and photodiodes (Kuschnerus et al 1998;Canfield et al 1998). …”

Section: Transfer Standardsmentioning

confidence: 99%

Spectroradiometry with space telescopes

Pauluhn

Huber

Smith

et al. 2015

Astron Astrophys Rev

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Radiometry, i.e. measuring the power of electromagnetic radiationhitherto often referred to as "photometry"-is of fundamental importance in astronomy. We provide an overview of how to achieve a valid laboratory calibration of space telescopes and discuss ways to reliably extend this calibration to the spectroscopic telescope's performance in space. A lot of effort has been, and still is going into radiometric "calibration" of telescopes once they are in space; these methods use celestial primary and transfer standards and are based in part on stellar models. The history of the calibration of the Hubble Space Telescope serves as a platform to review these methods. However, we insist that a true calibration of spectroscopic space telescopes must directly be based on and traceable to laboratory standards, and thus be independent of the observations. This has recently become a well-supported aim, following the discovery of the acceleration of the cosmic expansion by use of type-Ia supernovae, and has led to plans for launching calibration rockets for the visible and infrared spectral range. This is timely, too, because an adequate exploitation of data from present space missions, such as Gaia, and from many current astronomical projects like Euclid and WFIRST demands higher radiometric accuracy than is generally available today. A survey of the calibration of instruments observing from the X-ray to the infrared spectral domains that include instrument-or mission-specific estimates of radiometric accuracies rounds off this review.

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“…An examination of the errors in the various factors in Eqs. (1) and (2) indicates that the root-sum-squares error in R-1(X) is 15.1 percent. Combining this uncertainty with the uncertainty in the PMT current readings produces a final estimate 15.2 percent in the VUV continuum source radiance.…”

Section: Source Calibration Processmentioning

confidence: 99%

<title>Spectral radiance source for vacuum ultraviolet calibrations</title>

Sherrell¹

1993

SPIE Proceedings

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A working standard extended source of spectral radiance has been assembled and calibrated for use in the 150-to 260-nm region. The assembly consists of a 10-kw, argon arc lamp mounted to irradiate a 4-in. diam diffuser. The reflected energy from the diffuser is utilized as a calibration source. The procedure for calibrating the spectral radiance of the diffuser is reviewed. Traceability is accomplished by the use of a standard vacuum photodiode. The total uncertainty in the calibration ofthe source is estimated to be 15 percent.

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Radiometric calibrations of portable sources in the vacuum ultraviolet

Cited by 24 publications

References 16 publications

Measurements and modeling of CO 4th positive (A–X) radiation

Measurements and modeling of CO 4th positive (A–X) radiation

Spectroradiometry with space telescopes

<title>Spectral radiance source for vacuum ultraviolet calibrations</title>

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