An intercomparison of relative spectral responsivities of silicon photodiodes was carried out among four laboratories, ETL (Electrotechnical Laboratory), Saitama University, Hamamatsu Photonics Co., Ltd. and Matsushita Electric Industrial Co., Ltd.
The photodiodes were calibrated in the 250-800nm range using each laboratory's spectral responsivity standards. As a result, the relative spectral responsivities of the photodiodes calibrated by each laboratory agreed within 1.1% standard deviation in the 400-800nm, 2.2% in 315-400nm, 3.9% in 280-315nm and 4.1% in 250-280nm. Therefore, it is confirmed that the 4 laboratories have sufficient accuracy for calibration of the relative spectral responsivity of the detector in the ultraviolet and visible wavelength region.
