Innretning for måling av ultrafiolett stråling

摘要

An ultraviolet ray measuring apparatus is provided which comprises first and second photodiodes (101, 201) having substantially the same spectral sensitivity at least in an ultraviolet band, and a first optical filter (202, 204, 206) arranged in front of a light-receiving face (201) of the second photodiode, for shielding only light of at least a part of the ultraviolet band, and measures the light intensity and its accumulated value in accordance with the difference between electric signals output from the first and second photodiodes. According to the ultraviolet ray measuring apparatus of the invention, a second optical filter (30, 30A), which has a main transmitting band in the ultraviolet band and a sub-transmitting band in the visible light range, is arranged in front of the light-receiving faces of the first and second photodiode. A multi-step bar graph display device (4b) displays indexes, such as an MED multiple value and an SPF value, which represent the measured light intensity and accumulated value in association with a reference MED value, so that this apparatus can suitably serve as a sunburn monitor.