SPECTRUM MEASURING INSTRUMENT

摘要

In a spectrum measuring instrument of the present invention, a detecting surface (13a) of a detector (13) is a two-dimensional detecting surface and spectrum light coming out from a spectroscope is irradiated to a region A on the detecting surface (13a). Signal intensity at the regions on the detecting surface (13a) other than the region A where the spectrum light is irradiated is subtracted from signal intensity on the region A. Consequently, it is possible to obtain an accurate spectrum intensity signal by processing a detection signal in such a manner that adverse effects of stray light generated inside the spectrum measuring instrument and unwanted light generated by reflection and diffraction occurring on the surface of a detecting element are removed (Fig. 4).