Generation of irradiance patterns using a semi-spherical meter of two degrees of freedom

M. Tecpoyotl-Torres; J. G. Vera-Dimas; J. Escobedo-Alatorre; J. Sánchez-Mondragón; M. Torres-Cisneros; R. Cabello-Ruiz; J. Varona

doi:10.1117/12.902161

2 November 2011 Generation of irradiance patterns using a semi-spherical meter of two degrees of freedom

M. Tecpoyotl-Torres, J. G. Vera-Dimas, J. Escobedo-Alatorre, J. Sánchez-Mondragón, M. Torres-Cisneros, R. Cabello-Ruiz, J. Varona

Author Affiliations +

Proceedings Volume 8011, 22nd Congress of the International Commission for Optics: Light for the Development of the World; 80110Y (2011) https://doi.org/10.1117/12.902161
Event: International Commission for Optics (ICO 22), 2011, Puebla, Mexico

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".

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M. Tecpoyotl-Torres, J. G. Vera-Dimas, J. Escobedo-Alatorre, J. Sánchez-Mondragón, M. Torres-Cisneros, R. Cabello-Ruiz, and J. Varona "Generation of irradiance patterns using a semi-spherical meter of two degrees of freedom", Proc. SPIE 8011, 22nd Congress of the International Commission for Optics: Light for the Development of the World, 80110Y (2 November 2011); https://doi.org/10.1117/12.902161

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KEYWORDS

Lamps

Sensors

Light emitting diodes

Photodetectors

Prototyping

Data acquisition

Light sources and illumination

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