Characterization of modified FEL quartz-halogen lamps for photometric standards

Ohno, Yoshihiro; Jackson, John K.

doi:10.1088/0026-1394/32/6/60

Cited by 16 publications

(12 citation statements)

References 4 publications

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“…After the data are taken, the lamp is turned off (ramped down slowly for incandescent lamps), and the dark readings are taken. Finally, the detector signal, for a standard lamp or a test lamp is corrected by y' =y k (Jp) • ccf*-scf* / a. , (37) where k (T^is the temperature correction factor, ccf is the spectral mismatch correction factor, scf is the spatial nonuniformity correction factor, and is the self-absorption factor. The spatial nonuniformity correction factor, scf* , is usually not applied in the routine calibrations for regular incandescent lamps.…”

Section: Determination Of Luminous Fluxmentioning

confidence: 99%

“…Three 1000 W FEL type quartz halogen lamps are maintained as the NIST color temperature primary standard lamps in the range of 2000 K to 3200 K. These lamps have demonstrated stability of operation in this color temperature range [37]. The spectral irradianceof these lamps is calibrated periodically against the NIST spectral irradiance scale [20] at 2000 K, 2300 K, 2600 K, 2856 K, and 3200 K. The correlated color temperatures of these lamps are computed from the spectral irradiance values according to the procedures recommended by reference [46].…”

Section: Uncertainty Of Calibrationmentioning

confidence: 99%

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Photometric calibrations

Ohno¹

1997

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The calibration and related measurement services of the National Institute of Standards and Technology are intended to assist the makers and users of precision measuring instruments in achieving the highest possible levels of accuracy, quality, and productivity. NIST offers over 300 different calibrations, special tests, and measurement assurance services. These services allow customers to directly link their measurement systems to measurement systems and standards maintained by NIST. These services are offered to the public and private organizations alike. They are described in NIST Special Publication (SP) 250, NIST Calibration Services Users Guide. The Users Guide is supplemented by a number of Special Publications (designated as the "SP250 Series") that provide detailed descriptions of the important features of specific NIST calibration services. These documents provide a description of the: (1) specifications for the services; (2) design philosophy and theory; (3) NIST measurement system; (4) NIST operational procedures; (5) assessment of the measurement uncertainty including random and systematic errors and an error budget; and (6) internal quality control procedures used by NIST. These documents will present more detail than can be given in NIST calibration reports, or than is generally allowed in articles in scientific journals. In the past, NIST has published such information in a variety of ways. This series will make this type of information more readily available to the user. This document, SP250-37 (1996), NIST Measurement Services: Photometric Calibrations, is a revision of SP250-15 (1987). It covers the calibration of standards of luminous intensity, luminous flux, illuminance, luminance, and color temperature (test numbers 37010C-37100S in SP250, NIST Calibration Services Users Guide). Inquiries concerning the technical content of this document or the specifications for these services should be directed to the author or to one of the technical contacts cited in SP250. NIST welcomes suggestions on how publications such as this might be made more useful. Suggestions are also welcome concerning the need for new calibrations services, special tests, and measurement assurance programs.

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Section: Determination Of Luminous Fluxmentioning

confidence: 99%

Section: Uncertainty Of Calibrationmentioning

confidence: 99%

Photometric calibrations

Ohno¹

1997

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“…These reference standards, both for detectors and sources, are transferred to working standards for external calibrations, and used internally in deriving reference standards for colorimetric measurements. Three 1000 W FEL type quartz halogen lamps are maintained as the NIST color temperature primary standard lamps in the range of 2000 K to 3200 K. These lamps have demonstrated good stability of operation in this color temperature range [66]. The spectral irradiance of these lamps is calibrated periodically against the NIST spectral irradiance scale at 2000 K, 2300 K, 2600 K, 2856 K, and 3200 K. The correlated color temperatures of these lamps are computed from the spectral irradiance values according to the procedures recommended by reference [65].…”

Section: Nist Color Temperature Scalementioning

confidence: 99%

NIST measurement services: photometric calibrations

Zong¹,

Nadal²,

Tsai³

et al. 2018

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PrefaceThe calibration and related measurement services of the National Institute of Standards and Technology (NIST) are intended to assist the makers and users of precision measuring instruments in achieving the highest possible levels of accuracy, quality, and productivity. NIST offers over 300 different calibrations, special tests, and measurement assurance services. These services allow customers to directly link their measurement systems to measurement systems and standards maintained by NIST. These services are offered to the public and private organizations alike. They are described in NIST Special Publication (SP) 250, NIST Calibration Services Users Guide.The Users Guide is supplemented by a number of Special Publications (designated as the "SP250 Series") that provide detailed descriptions of the important features of specific NIST calibration services. These documents provide a description of the: (1) specifications for the services; (2) design philosophy and theory; (3) NIST measurement system; (4) NIST operational procedures; (5) assessment of the measurement uncertainty including an uncertainty budget; and (6) internal quality control procedures used by NIST. These documents will present more detail than can be given in NIST calibration reports, or than is generally allowed in articles in scientific journals. In the past, NIST has published such information in a variety of ways. This series will make this type of information more readily available to the user. This document, SP250-95 (2017), NIST Photometric Calibrations, is a revision of SP250-37 (1997). It covers the calibration of standards of luminous intensity, luminous flux, illuminance, luminance, luminous exposure, and color temperature (test numbers 37010C-37070C and 37020S-37130S in SP250, NIST Calibration Services Users Guide). Inquiries concerning the technical content of this document or the specifications for these services should be directed to one of the authors or to one of the technical contacts cited in SP250.NIST welcomes suggestions on how publications such as this might be made more useful. Suggestions are also welcome concerning the need for new calibrations services, special tests, and measurement assurance programs. AbstractThe National Institute of Standards and Technology provides calibration services for submitted artifacts for luminous intensity, illuminance, color temperature, total luminous flux, luminous exposure and luminance. Additionally, the National Institute of Standards and Technology issues calibrated standards of luminous intensity, luminance, and color temperature. The procedures, equipment, and techniques used to perform these calibrations are described. Detailed estimates and procedures for determining uncertainties of the reported values are also presented along with the internal quality control procedures.

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“…This trend raises some important questions, since tungsten filament incandescent lamps are widely used as source standards in photometry 6,7,8,9,10 . For example, will tungsten filament standard lamps still be available in the future, and if so, what will be their price?…”

Section: Introductionmentioning

confidence: 99%

Advantages of white LED lamps and new detector technology in photometry

et al. 2015

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Light emitting diode (LED) lighting is becoming more and more popular, as incandescent lamps are being phased out globally. LEDs have several advantages over incandescent lamps, including energy efficiency, robustness, long lifetime, and good temporal stability. The three latter features make LEDs attractive candidates as new photometric standards. Because the spectra of white LEDs are limited to the visible wavelength range, a novel method for the realization of photometric units based on the predictable quantum efficient detector (PQED) can be utilized. The method eliminates the need of photometric filters that are traditionally used in photometry, and instead relies on carrying out the photometric weighting numerically based on the measured relative spectrum of the source. The PQED-based realization simplifies the traceability chain of photometric measurements significantly as compared with the traditional filter-based method. The measured illuminance values of a white LED deviate by only 0.03% when determined by the new and the traditional methods. The new PQED method has significantly lower expanded uncertainty of 0.26% (k 5 2) as compared with that of the traditional filter-based method of 0.42% (k 5 2). Furthermore, when filtered photometers that measure LED lighting are calibrated using LED lamps as calibration sources instead of incandescent lamps, a significant decrease in the uncertainty related to the spectral mismatch correction can be obtained. The maximum spectral mismatch errors of LED measurements decreased on average by a factor of 3 when switching from an incandescent lamp to an LED calibration source.

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Characterization of modified FEL quartz-halogen lamps for photometric standards

Cited by 16 publications

References 4 publications

Photometric calibrations

Photometric calibrations

NIST measurement services: photometric calibrations

Advantages of white LED lamps and new detector technology in photometry

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