Title :
Effective area measurement of apertures by optical method
Author :
Kang, Chang-Ho ; Kim, Sok-Won ; Park, Seung-Nam
Author_Institution :
Dept. of Phys., Ulsan Univ., South Korea
Abstract :
Improvement of uncertainties in detector-based photometry and radiometry requires precise optical measurement of radiometric aperture area including diffraction from the aperture and scattering from its edge. This paper introduces a method for the aperture, of which measurement is based on radiant flux transmitted through the aperture. The radiant flux with a uniform irradiance distribution was made by superposition of Gaussian laser beams that is accomplished by translators. To calibrate the displacement of the translators, a heterodyne interferometer was used. For the aperture fabricated to 7 mm by a diamond turning machine, the area uncertainty was evaluated by considering repeatability, correction of translator displacement and efficiency variation of the integrating sphere. The result was compared with that obtained by a three-dimension profilometer.
Keywords :
calibration; interferometers; light diffraction; light scattering; measurement by laser beam; optical fabrication; photometry; radiometry; 7 mm; Gaussian laser beams; detector-based photometry; diamond turning machine; diffraction; effective area measurement; heterodyne interferometer; integrating sphere; optical measurement; optical method; radiant flux; radiometric aperture area; radiometry; scattering from its edge; three-dimension profilometer; translators displacement; uniform irradiance distribution;
Conference_Titel :
Science and Technology, 2003. Proceedings KORUS 2003. The 7th Korea-Russia International Symposium on
Conference_Location :
Ulsan, South Korea
Print_ISBN :
89-7868-617-6