J. L. Velazquez, A. Ferrero, M. López, A. Pons, A. Villamarín, J. Campos, A. Sperling
{"title":"低功率led平均发光强度的角分布传输标准","authors":"J. L. Velazquez, A. Ferrero, M. López, A. Pons, A. Villamarín, J. Campos, A. Sperling","doi":"10.1117/12.2027039","DOIUrl":null,"url":null,"abstract":"A goniophotometer to characterize the angular distribution of the averaged luminous intensity of LEDs has been developed at Optics Institute of CSIC. Distributions of for four low-power LEDs transfer standards (red, blue, green and white) for luminous flux and luminous intensity are shown. A proper characterization of the angular luminous intensity distribution allows measurement uncertainties to be better determined. The instrument has got a photometer placed on a ruled optical bench to vary the source-detector distance and a CCD camera to carry out the alignment of the LEDs respect to the centre of geometrical reference system. Measurements were taken at a distance of 316 mm (condition A of the CIE) to different LEDs by varying the polar angle between 0° and 90° with a step of 5° and the azimuth angle between 0° and 180° with a step of around 11°. The red LED is the most Lambertian, whereas the blue, green and white LEDs have a different behavior. Finally, to identify systematic errors, a comparison with the measurements of a similar goniophotometer in Physikalisch-Technische Bundesanstalt (PTB) was carried out.","PeriodicalId":135913,"journal":{"name":"Iberoamerican Meeting of Optics and the Latin American Meeting of Optics, Lasers and Their Applications","volume":"408 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2013-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"1","resultStr":"{\"title\":\"Angular distribution of the averaged luminous intensity of low power LEDs transfer standards\",\"authors\":\"J. L. Velazquez, A. Ferrero, M. López, A. Pons, A. Villamarín, J. Campos, A. Sperling\",\"doi\":\"10.1117/12.2027039\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"A goniophotometer to characterize the angular distribution of the averaged luminous intensity of LEDs has been developed at Optics Institute of CSIC. Distributions of for four low-power LEDs transfer standards (red, blue, green and white) for luminous flux and luminous intensity are shown. A proper characterization of the angular luminous intensity distribution allows measurement uncertainties to be better determined. The instrument has got a photometer placed on a ruled optical bench to vary the source-detector distance and a CCD camera to carry out the alignment of the LEDs respect to the centre of geometrical reference system. Measurements were taken at a distance of 316 mm (condition A of the CIE) to different LEDs by varying the polar angle between 0° and 90° with a step of 5° and the azimuth angle between 0° and 180° with a step of around 11°. The red LED is the most Lambertian, whereas the blue, green and white LEDs have a different behavior. Finally, to identify systematic errors, a comparison with the measurements of a similar goniophotometer in Physikalisch-Technische Bundesanstalt (PTB) was carried out.\",\"PeriodicalId\":135913,\"journal\":{\"name\":\"Iberoamerican Meeting of Optics and the Latin American Meeting of Optics, Lasers and Their Applications\",\"volume\":\"408 1\",\"pages\":\"0\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2013-11-18\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"1\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Iberoamerican Meeting of Optics and the Latin American Meeting of Optics, Lasers and Their Applications\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.1117/12.2027039\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Iberoamerican Meeting of Optics and the Latin American Meeting of Optics, Lasers and Their Applications","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1117/12.2027039","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
Angular distribution of the averaged luminous intensity of low power LEDs transfer standards
A goniophotometer to characterize the angular distribution of the averaged luminous intensity of LEDs has been developed at Optics Institute of CSIC. Distributions of for four low-power LEDs transfer standards (red, blue, green and white) for luminous flux and luminous intensity are shown. A proper characterization of the angular luminous intensity distribution allows measurement uncertainties to be better determined. The instrument has got a photometer placed on a ruled optical bench to vary the source-detector distance and a CCD camera to carry out the alignment of the LEDs respect to the centre of geometrical reference system. Measurements were taken at a distance of 316 mm (condition A of the CIE) to different LEDs by varying the polar angle between 0° and 90° with a step of 5° and the azimuth angle between 0° and 180° with a step of around 11°. The red LED is the most Lambertian, whereas the blue, green and white LEDs have a different behavior. Finally, to identify systematic errors, a comparison with the measurements of a similar goniophotometer in Physikalisch-Technische Bundesanstalt (PTB) was carried out.