부산대학교 도서관

ABSTRACTA light source which simulates the ultraviolet part of the solar spectrum, but at a much higher intensity, has been developed.† The source consists of a 150 watt xenon lamp, collecting optics, spectral shaping components, and a refocussing lens.The output spectrum has 70% of its energy at wavelengths below 400 nm and resembles the spectrum of daylight ultraviolet for a 70° sun elevation. The intensity over a 1 cm diameter uniform spot is about 10 times that of daylight ultraviolet. At other focal positions, stronger intensities over smaller uniform areas and weaker intensities over larger uniform areas are found, all with the same spectrum. For uniform areas with less than 1 cm diameter the intensity can exceed the heat erythema threshold for multiple doses.Operation of the simulator fulfills the simplicity requirement and little maintenance is required. The output is constant with no more than a 20% decrease during the life of the lamp; the simulator weighs 5 pounds, and its power supply, to which it is cabled, weighs 35 pounds, so that each or both are portable. The spectrum can be readily changed by introducing other filters into available holders in the light path so that action spectrum studies can be performed.This type of simulator has been in use for clinical and research applications for 2 years.