Mr. Antonio Marques Profile

Antonio Marques

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Proceedings Article | 3 November 2011 Paper

Characterization of halogen lamps as secondary standard of luminous flux

A. A. R. Marques, O. Sanchez, A. F. G. Ferreira

Proceedings Volume 8011, 801110 (2011) https://doi.org/10.1117/12.902183

KEYWORDS: Lamps, Integrating spheres, Halogens, Photometry, Calibration, Sensors, Head, Data acquisition, Resistors, Helium neon lasers

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This work presents a study of lamps characterization concerning its lamp output, current and voltage drift during seasoning and regarding the use of theses lamps as luminous flux secondary standard. The 200W halogen lamps are seasoned for 30 hours and during the seasoning period the relative drift of the lamp illuminance, current and voltage are measured at each 3 minutes. The illuminance is measured using a photometer with detector head, the lamp voltage is measured using a 6.5 digits voltmeter and the current is measured using a 6.5 digits voltmeter and 0.1 Ohms standard resistor. The lamp current is controlled by a calibrated current power source with stability better than 1 mA. To reduce the stray light, baffles are positioned between the lamp and the detector head. The alignment of experimental assembly is made by a He-Ne Laser. Data of illuminance, current and voltage is acquired by software built in Labview database. Among the 5 lamps seasoned, the best result presents the variation of illuminance of 0.04% per hour. This lamp is chosen to become the secondary standard and its luminous flux is measured using an Ulbricht integrating sphere. This method allows the laboratory to create secondary standard of luminous flux for its routine test and measurements and to supply theses standards for Brazilian industry.

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