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  1. 2 Acta Physica Polonica A

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  1. 1 2011

  2. 1 2008

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  1. 2 Sametoglu F.

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Estimation of Calibration Uncertainties in the Detector-Based Photometric Calibrations

100%
Sametoglu F.
Acta Physica Polonica A
|
2008
|
vol. 114
|
issue 4
881-901
EN
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,x_i) was finally determined to present the dominant and less important contributions.
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Construction of Two-Axis Goniophotometer for Measurement of Spatial Distribution of a Light Source and Calculation of Luminous Flux

100%
Sametoglu F.
Acta Physica Polonica A
|
2011
|
vol. 119
|
issue 6
783-791
EN
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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