New traceability chains in the photometric and radiometric measurements at the National Metrology Institute of Turkey

Sametoglu, Ferhat

doi:10.1016/j.optlaseng.2006.05.002

Cited by 8 publications

(4 citation statements)

References 13 publications

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“…The spectral irradiance was modeled with 3rd degree o f polynomial to compensate for deviations of the lamp used in measurement fro m that of ideal b lackbody radiator. (9)(10) Fro m eq. (4) & eq.…”

Section: Exp( / )mentioning

confidence: 99%

Measurement of Luminous Intensity Using Filtered Trap Detector

Khalil¹,

E-Sharkawy²,

Shaarawy³

et al. 2012

OPTICS

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The work described in this paper is a part of the process of lamp and photometer calibration to obtain a new lu minous-intensity scale with a lower uncertainty. The procedure and the results of realizing the photometric scale with a standardized detector at the National Institute for Standards (NIS) are described. Th is method enables photometric values to be derived from absolute spectroradiometric measurements by exact co mputation. A filtered trap detector has been characterized and used to measure the absolute spectral power distribution of standard lamps. Fro m these data a photometric scale of lu minous intensity has been realized. The results were co mpared to the cert ified calib ration values obtained by Nat ional Physical Laboratory (NPL), and showed agreement within uncertainty of ± 1.8%

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Section: Exp( / )mentioning

confidence: 99%

Measurement of Luminous Intensity Using Filtered Trap Detector

Khalil¹,

E-Sharkawy²,

Shaarawy³

et al. 2012

OPTICS

View full text Add to dashboard Cite

show abstract

“…The spectral responsivity, uniformity and linearity of the photometer head as well as the spectral transmittance of the V (λ)-filter were characterized by the TUBITAK UME detector calibration and characterization facilities [18][19][20]. The diameter of the monochromatic beam was aligned to ≈ 2 mm and a substitution method with the reference trap detector was used to obtain the relative spectral responsivity variation of the photometer head.…”

Section: Description Of the Designed Photometer Headmentioning

confidence: 99%

Construction of Two-Axis Goniophotometer for Measurement of Spatial Distribution of a Light Source and Calculation of Luminous Flux

Sametoglu

2011

Acta Phys. Pol. A

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A two-axis goniophotometer is constructed at National Metrology Institute of Turkey (TUBITAK UME) for characterizing photometric properties of compact light sources. With the new device, total luminous flux emitted by a light source at both cap-up or cap-down mounting positions is calculated from the integration of the illuminance values E(θ, ϕ) measured on the goniometric spherical surface. The internal calibration of the system is performed by means of two calibrated light sources with known luminous flux values. The constructed system is also capable of measuring the luminous intensity distribution values I(θ, ϕ) of compact light sources. The uncertainty analyses of the luminous flux measurements as well as the internal calibration of the instrument are also presented herein.

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“…The optical axis was determined by using a laser beam. The circular aperture having nominal diameter of A = 20 mm was used in front of the port of the LSUC for defining the luminance area [13]. The CPH was located at the appropriate photometric distance (d) from the aperture of the LSUC and the illuminance value (E LSUC ) was determined by dividing the generated photocurrent (P c ) at the output of the CPH by its illuminance responsivity (s v ).…”

Section: Uncertainty Evaluation In the Luminance Calibrationmentioning

confidence: 99%

“…It causes standard uncertainty of u(d p ) = 0.000014 m assuming a NTD. The LSUC has a circular opening (diffusing surface) with diameter of 70 mm [13]. Calibrated black-anodized aluminum aperture with diameter of 20.012 mm was placed close to the opening of the LSUC to define the area.…”

Section: Uncertainty Evaluation In the Luminance Calibrationmentioning

confidence: 99%

Estimation of Calibration Uncertainties in the Detector-Based Photometric Calibrations

Sametoglu

2008

Acta Phys. Pol. A

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Uncertainty evaluations in the photometric calibrations and established uncertainty budgets at National Metrology Institute of Turkey (TUBITAK--UME) are presented. Uncertainty analyses are cover calibrations of the luminous intensity, the luminous flux and the luminance properties of the optical light source. The combined uncertainty in each photometric calibration was evaluated using developed uncertainty models. The degrees of freedom in each input and output quantities were also determined. The coefficient of uncertainty contribution h(y, xi) was finally determined to present the dominant and less important contributions.

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New traceability chains in the photometric and radiometric measurements at the National Metrology Institute of Turkey

Cited by 8 publications

References 13 publications

Measurement of Luminous Intensity Using Filtered Trap Detector

Measurement of Luminous Intensity Using Filtered Trap Detector

Construction of Two-Axis Goniophotometer for Measurement of Spatial Distribution of a Light Source and Calculation of Luminous Flux

Estimation of Calibration Uncertainties in the Detector-Based Photometric Calibrations

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