DESIGN AND PERFORMANCE OF THE OKAZAKI LARGE SPECTROGRAPH FOR PHOTOBIOLOGICAL RESEARCH |
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| Authors: | Masakatsu,WatanabeMasaki,Furuya&dagger Yasuhiro,Miyoshi&dagger Yasunori,Inoue&dagger Isao,Iwahashi&Dagger Koichi,Matsumoto&Dagger |
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| Affiliation: | National Institute for Basic Biology, Okazaki National Research Institutes, Okazaki, Aichi 444;Biology Department, Faculty of Science, University of Tokyo, Hongo, Tokyo 113.;Naka Works, Hitachi Ltd., Katsuta, Ibaraki 312, Japan |
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| Abstract: | A computer-operated spectrograph was recently built at Okazaki, Japan. Different specimens can be placed on a horseshoe-shaped focal curve (10 m long) covering a wavelength range of 250 to 1000 nm so they can be irradiated simultaneously. The linear dispersion is about 0.8 nm/cm. The photon fluence rate on the focal curve is 5 x 1015. photons x cm-2 x s-1 at 300nm and 1 x 1016 photons x cm-2 x s-1 at 600 and at 900 nm. The spectral half width is 5.5 nm or less on the focal curve. The stray light content is about 10-5 of the main peak at the peak wavelength ± 100 nm. Specimens are set in microcomputer-controlled threshold boxes so that wavelengths, photon fluence rates, photon fluences and timing of irradiations are controlled automatically according to a pre-programmed schedule. An optical fiber system is also provided for remote irradiations. |
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