4. High-Accuracy Spectral Radiance Calibration of Tungsten-Strip Lamps

Kostkowski, Henry J.; Erminy, D. E.; Hattenburg, Albert T.

doi:10.1016/s0065-2687(08)60154-5

Cited by 14 publications

(11 citation statements)

References 15 publications

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“…After fairly successful use for more than half a century, [60][61][62][63][64] conventional tungsten ribbon lamps 19 calibrated against NIST standards for absolute values of spectral radiance were discontinued. The modern alternatives to these relatively cheap yet robust and reliable light sources are standards of spectral radiance employing integrating spheres 65,66 and high-power quartz halogen lamps or quasi-continuouswave lasers.…”

Section: Continuous Laboratory Sourcesmentioning

confidence: 99%

Contributed Review: Absolute spectral radiance calibration of fiber-optic shock-temperature pyrometers using a coiled-coil irradiance standard lamp

Fat’yanov

Asimow

2015

Review of Scientific Instruments

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Development of a fast fiber-optic two-color pyrometer for the temperature measurement of surfaces with varying emissivities Rev. Sci. Instrum. 72, 3366 (2001); 10.1063/1.1384448 This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitationnew. We describe an accurate and precise calibration procedure for multichannel optical pyrometers such as the 6-channel, 3-ns temporal resolution instrument used in the Caltech experimental geophysics laboratory. We begin with a review of calibration sources for shock temperatures in the 3000-30 000 K range. High-power, coiled tungsten halogen standards of spectral irradiance appear to be the only practical alternative to NIST-traceable tungsten ribbon lamps, which are no longer available with large enough calibrated area. However, non-uniform radiance complicates the use of such coiled lamps for reliable and reproducible calibration of pyrometers that employ imaging or relay optics. Careful analysis of documented methods of shock pyrometer calibration to coiled irradiance standard lamps shows that only one technique, not directly applicable in our case, is free of major radiometric errors. We provide a detailed description of the modified Caltech pyrometer instrument and a procedure for its absolute spectral radiance calibration, accurate to ±5%. We employ a designated central area of a 0.7× demagnified image of a coiled-coil tungsten halogen lamp filament, cross-calibrated against a NIST-traceable tungsten ribbon lamp. We give the results of the cross-calibration along with descriptions of the optical arrangement, data acquisition, and processing. We describe a procedure to characterize the difference between the static and dynamic response of amplified photodetectors, allowing time-dependent photodiode correction factors for spectral radiance histories from shock experiments. We validate correct operation of the modified Caltech pyrometer with actual shock temperature experiments on single-crystal NaCl and MgO and obtain very good agreement with the literature data for these substances. We conclude with a summary of the most essential requirements for error-free calibration of a fiber-optic shock-temperature pyrometer using a high-power coiled tungsten halogen irradiance standard lamp. C 2015 AIP Publishing LLC.[http://dx

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Section: Continuous Laboratory Sourcesmentioning

confidence: 99%

Contributed Review: Absolute spectral radiance calibration of fiber-optic shock-temperature pyrometers using a coiled-coil irradiance standard lamp

Fat’yanov

Asimow

2015

Review of Scientific Instruments

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“…The VTBB has a small 2-mm-diameter opening, and the estimated emissivity of the VTBB is 0.9990 Ϯ 0.0005 based on the geometry and temperature uniformity. 7 The spectral radiance of tungsten-filament lamps and integrating sphere sources is assigned by use of the VTBB; and typically, the temperature of the VTBB is changed to match the spectral radiance of the sources to minimize the effects that are due to the nonlinear responsivities of the detectors. For spectral irradiance realizations, the spectral radiance of an integrating-sphere source ͑ISS͒ is assigned, and the ISS is fitted with a precision aperture for use as a source of known spectral irradiance to calibrate a set of 1000-W free-electron laser (FEL) lamps.…”

Section: Introductionmentioning

confidence: 99%

Realization of the National Institute of Standards and Technology detector-based spectral irradiance scale

2002

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A detector-based spectral irradiance scale has been realized at the National Institute of Standards and Technology (NIST). Unlike the previous NIST spectral irradiance scales, the new scale is generated with filter radiometers calibrated for absolute spectral power responsivity traceable to the NIST high-accuracy cryogenic radiometer instead of with the gold freezing-point blackbody. The calibrated filter radiometers are then used to establish the radiance temperature of a high-temperature blackbody (HTBB) operating near 3,000 K The spectral irradiance of the HTBB is then determined with knowledge of the geometric factors and is used to assign the spectral irradiances of a group of 1,000-W free-electron laser lamps. The detector-based spectral irradiance scale results in the reduction of the uncertainties from the previous source-based spectral irradiance scale by at least a factor of 2 in the ultraviolet and visible wavelength regions. The new detector-based spectral irradiance scale also leads to a reduction in the uncertainties in the shortwave infrared wavelength region by at least a factor of 2-10, depending on the wavelength. Following the establishment of the spectral irradiance scale in the early 1960s, the detector-based spectral irradiance scale represents a fundamental change in the way that the NIST spectral irradiance scale is realized.

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“…Figure 5 shows a cross-sectional view of the central section. The blackbody emissivity has been assessed by measurements of the solid angle subtended by the cavity opening, the partial reflectivity of the graphite material [9], the temperature gradients, and the absorption by gases [10]. The solid angle subtended at the rear wall of the cavity by the inner edge of the observation hole is about 0.03 sr.…”

Section: Scale Derivation and Transfermentioning

confidence: 99%

“…Various empirical drift models have been used [3]. The present drift equation is Ex=A +B-t, (10) where:…”

Section: Scale Realization Data Analysismentioning

confidence: 99%

“…The model error is necessary because the primary working standards drift with time. A time drift model is applied for each of the primary working standards [see eq (10)] but the possibility that this drift may be wrong introduces an additional uncertainty in table 5, but not included in table 2 or table 4. This uncertainty was obtained by comparing the calculated extrapolated spectral irradiance with further scale realizations.…”

Section: Overall Uncertainty Of the Primary Workingmentioning

confidence: 99%

See 1 more Smart Citation

The NBS scale of spectral irradiance

Walker¹,

Saunders²,

Jackson³

et al. 1988

J. RES. NATL. BUR. STAN.

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This paper describes the measurement methods and the instrumentation used in the realization and transfer of the NBS scale of spectral irradiance. The basic measurement equation for the irradiance realization is derived. The spectral responsivity function, linearity of response, and "size of source" effect of the spectroradiometer are described. The analysis of sources of error and the estimates of uncertainty are described.The assigned uncertainties (3c, level) in spectral irradiance range from 2.2% at 250 nm to 1.0% at 654.6 nm to 6.5% at 2400 nm.

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4. High-Accuracy Spectral Radiance Calibration of Tungsten-Strip Lamps

Cited by 14 publications

References 15 publications

Contributed Review: Absolute spectral radiance calibration of fiber-optic shock-temperature pyrometers using a coiled-coil irradiance standard lamp

Contributed Review: Absolute spectral radiance calibration of fiber-optic shock-temperature pyrometers using a coiled-coil irradiance standard lamp

Realization of the National Institute of Standards and Technology detector-based spectral irradiance scale

The NBS scale of spectral irradiance

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