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Proceedings Paper

Generation of irradiance patterns using a semi-spherical meter of two degrees of freedom
Author(s): M. Tecpoyotl-Torres; J. G. Vera-Dimas; J. Escobedo-Alatorre; J. Sánchez-Mondragón; M. Torres-Cisneros; R. Cabello-Ruiz; J. Varona
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Paper Abstract

The meter device presented in this work consists of a photo-detector mounted on the mechanism of a mobile rectangular arc. One stepper motor located on the lateral axis of the device displaces the sensor along a semi-circular trajectory of 170°, almost half meridians. Another motor located at the base of the device enables 360° rotation of the illumination source under test. This arrangement effectively produces a semi-spherical volume for the sensor to move within. The number of measurement points is determined by programming the two stepper motors. Also, the use of a single photo-sensor ensures uniformity in the measurements. The mechanical structure provides enough rigidity for supporting the accuracy required by the data acquisition circuitry based on a DSPIC. Measurement of illumination sources of different sizes is possible by using adjustable lengths of the mobile base and the ring for a maximum lamp length of 0.16 m. Because this work is partially supported by a private entity interested in the characterization of its products, especial attention has been given to the luminaries based on LED technology with divergent beams. The received power by the detector is useful to obtain the irradiance profile of the lighting source under test. The meter device presented herein is a low-cost prototype designed and fabricated using recyclable materials only such as "electronic waste".

Paper Details

Date Published: 3 November 2011
PDF: 8 pages
Proc. SPIE 8011, 22nd Congress of the International Commission for Optics: Light for the Development of the World, 80110Y (3 November 2011); doi: 10.1117/12.902161
Show Author Affiliations
M. Tecpoyotl-Torres, Univ. Autónoma del Estado de Morelos (Mexico)
J. G. Vera-Dimas, Univ. Autónoma del Estado de Morelos (Mexico)
J. Escobedo-Alatorre, Univ. Autónoma del Estado de Morelos (Mexico)
J. Sánchez-Mondragón, Instituto Nacional de Astrofísica, Óptica y Electrónica (Mexico)
M. Torres-Cisneros, Univ. de Guanajuato (Mexico)
R. Cabello-Ruiz, Univ. Autónoma del Estado de Morelos (Mexico)
J. Varona, Univ. Panamericana (Mexico)


Published in SPIE Proceedings Vol. 8011:
22nd Congress of the International Commission for Optics: Light for the Development of the World

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