| 摘要 |
Detected and stored are zero-order light positions which are an angular position of the pre-spectroscope and that of the main spectroscope at which a main light ray incident on the inlet slit reaches the outlet slit via the pre-spectroscope and the main spectroscope. In a state where the main spectroscope is located at its zero-order light position, the pre-spectroscope is rotated to detect the angular position of the pre-spectroscope for a predetermined wavelength. Further, in a state where the pre-spectroscope is located at its zero-order light position, the main spectroscope is rotated to detect the angular position of the main spectroscope for the predetermined wavelength.
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