Photometric calibrations

Booker, Robert L.; McSparron, Donald A

doi:10.6028/nbs.sp.250-15

Cited by 13 publications

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“…Representing the quantities in terms of the lumen, the photometric equivalent of the watt, instead of the candela lends symmetry to the table and a convenience for understanding the often confusing radiometric and photometric terms. The NIST maintenance of irradiance, radiance, and the photometric units has been discussed in a series of special publications available from NIST or the U.S. Government Printing Office [4,5,6]. In order to assess the importance of the NIST photometric and radiometric work in the technical community, Kostkowski reviewed the industrial and commercial impact of these activities and the Council for Optical Radiation Measurement (CORM) has produced detailed reports outlining industrial and technical requirements for the U.S. scientific community [7,8].…”

Section: Introductionmentioning

confidence: 99%

A national measurement system for radiometry, photometry, and pyrometry based upon absolute detectors

Parr¹

1996

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Gaithersburg, MD USA 20899-0001 Advancements in the performance and ease of use of absolute photodetectors based upon electrical substitution principals offers the possibility of a simplified and more accurate way to transfer the fundamental radiometric, photometric, and pyrometric units from NIST to the U.S. technical establishment. The history of electrical substitution radiometers at NIST is briefly reviewed and the implementation of the latest generation absolute cryogenic radiometer is discussed. Procedures to maintain fundamental units based upon a detector approach are reviewed in a general way with references to the technical literature for detailed discussion. It is proposed that NIST customers consider adopting the suggestions made in this technical note to simplify and improve their optical radiation based calibrations.

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Section: Introductionmentioning

confidence: 99%

A national measurement system for radiometry, photometry, and pyrometry based upon absolute detectors

Parr¹

1996

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“…(Since the HPS random variation was determined separately and is included in the 1.0% stability uncertainty, the random error of the standard is calculated as the square root of half of the square of the combined value reported in ref. [23]. )…”

Section: Summary Of Uncertainties Evaluatedmentioning

confidence: 98%

Optical radiation measurements :

Bruening¹,

He²

1988

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The stability of commercial 400W high pressure sodium lamps has been studied to allow the selection of lamps that produce a stable luminous flux on relighting. The properties of the lamps have been studied during the first minutes of starting, their output on relighting in place, and their output after 100' s of hours burning. Lamps have been selected that repeat to + 1% on relighting, and are expected to remain that stable over a life of about 450 hours. The lamps have been calibrated for total luminous flux by sphere comparison, with an uncertainty of +4.6%. These lamps will be used as working standards, and goniometric measurements will be made to reduce the uncertainty.

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“…Following the redefinition, many national laboratories, including NIST, derived and maintained the candela (and derived photometric units) using calibrated standard detectors traceable to cryogenic radiometry rather than standard lamps traceable to primary standard blackbodies and international temperature scales. 55,56 Since 1992, the candela has been maintained at NIST by using a group of eight standard photometers. 57 The overall relative expanded uncertainty (k ϭ 2) for the NIST illuminance unit realization is currently 0.39%.…”

Section: B Photometrymentioning

confidence: 99%

Facility for spectral irradiance and radiance responsivity calibrations using uniform sources

2006

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Detectors have historically been calibrated for spectral power responsivity at the National Institute of Standards and Technology by using a lamp-monochromator system to tune the wavelength of the excitation source. Silicon detectors can be calibrated in the visible spectral region with combined standard uncertainties at the 0.1% level. However, uncertainties increase dramatically when measuring an instrument's spectral irradiance or radiance responsivity. We describe what we believe to be a new laser-based facility for spectral irradiance and radiance responsivity calibrations using uniform sources (SIRCUS) that was developed to calibrate instruments directly in irradiance or radiance mode with uncertainties approaching or exceeding those available for spectral power responsivity calibrations. In SIRCUS, the emission from high-power, tunable lasers is introduced into an integrating sphere using optical fibers, producing uniform, quasi-Lambertian, high-radiant-flux sources. Reference standard irradiance detectors, calibrated directly against national primary standards for spectral power responsivity and aperture area measurement, are used to determine the irradiance at a reference plane. Knowing the measurement geometry, the source radiance can be readily determined as well. The radiometric properties of the SIRCUS source coupled with state-of-the-art transfer standard radiometers whose responses are directly traceable to primary national radiometric scales result in typical combined standard uncertainties in irradiance and radiance responsivity calibrations of less than 0.1%. The details of the facility and its effect on primary national radiometric scales are discussed.

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Photometric calibrations

Cited by 13 publications

References 0 publications

A national measurement system for radiometry, photometry, and pyrometry based upon absolute detectors

A national measurement system for radiometry, photometry, and pyrometry based upon absolute detectors

Optical radiation measurements :

Facility for spectral irradiance and radiance responsivity calibrations using uniform sources

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