Spectrophotometric tests using a dye-laser-based radiometric characterization facility

Schaefer, A. R.; Eckerle, K. L.

doi:10.1364/ao.23.000250

Cited by 16 publications

(7 citation statements)

References 5 publications

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“…An alternate method of calibrating an FR was developed by Schaefer and his collaborators at NIST [33]. This technique utilized a dye laser system which featured wavelength tunability and provided the capability of scanning over the wavelength range of the filter's transmittance.…”

Section: Detector Spectral Comparatorsmentioning

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: Detector Spectral Comparatorsmentioning

confidence: 99%

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

Parr¹

1996

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“…V o͑ SIRCUS ͒ ϭ ͵s͑͒E͑͒d, (7) where s͑͒ is the spectral responsivity of one of the radiometer channels and E͑͒ is an exoatmospheric solar irradiance spectrum. In this work we used the exoatmospheric solar irradiance spectrum developed by Thuillier et al 70 To perform the integration, the s͑͒ and the E͑͒ were interpolated to a uniform wavelength interval of 0.25 nm and integrated.…”

Section: Solar Irradiancementioning

confidence: 99%

“…Replacing the lamp-monochromator source with a tunable laser source has a number of advantages for radiometric applications, in particular the high-power, very narrow spectral bandwidth, and the extremely low wavelength uncertainty of the laser-based source. Schaefer and Eckerle 7 developed the first laser-based radiometric facility at NIST in 1984. In 1986, independent irradiance scales maintained by NIST based on blackbody or synchrotron radiation were compared with scales established on the laser calibration facility based on silicon photodiode physics traceable to cryogenic radiometry.…”

Section: Introductionmentioning

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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“…Noncommercial spectrophotometers that have been described include one in which the output from the photomultiplier is equivalent to an output of two times the frequency modulated signal created by a vibrating slit (13), a computer-controlled rapid scanning spectrophotometer using a dissector tube as the radiation detector (21), a near-UV-vis parallel-access instrument with microprocessor control for single and multicomponent determinations (41), a high-precision instrument for multicomponent determinations using a modulator consisting of a shutter and four-slotted diaphragm (328), a prototype instrument with single optical fibers and a white-light source for use in on-line measurements (188), a continuous photometric analyzer in which the light source and detector are in sealed tubes immersed directly in the sample solution (155), a system for making photon correlation measurements in the heterodyne mode (423), and a highly accurate dye-laser-based system for measuring the spectral transmittance of filters (427). The interest in diode arrays and similar devices as detectors remains high as evidenced by the appearance of numerous papers concerning their use.…”

Section: Physicsmentioning

confidence: 99%

Ultraviolet and light absorption spectrometry

Howell¹,

Hargis²

1986

Anal. Chem.

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Spectrophotometric tests using a dye-laser-based radiometric characterization facility

Cited by 16 publications

References 5 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

Facility for spectral irradiance and radiance responsivity calibrations using uniform sources

Ultraviolet and light absorption spectrometry

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