Spectrophotometer including photodiode array

摘要

A spectrophotometer in which a normal plane to a diffraction grating is inclined with respect to an optical axis of an incident light passing through a slit, the normal plane to the diffraction grating passing through an intersection point between the optical axis of the incident light i and a grating surface of the diffraction grating. The diffraction grating and a photodiode array PDA are placed such that the photodiode array PDA is parallel to the normal plane to the diffraction grating and that a normal plane to the photodiode array PDA includes a line that is symmetrical to the optical axis of the incident light i about the normal plane to the diffraction grating.

主权项

1. A spectrophotometer comprising:
a) a slit; b) a diffraction grating which wavelength-disperses an incident light passing through the slit; and c) a photodiode array including a plurality of light intensity measurement elements arranged in a direction of the wavelength dispersion by the diffraction grating, wherein a first plane which is perpendicular to a grating line and passes through an intersection point between an optical axis of the incident light and a grating surface of the diffraction grating is not coincident with a second plane which is perpendicular to surfaces of the light intensity measurement elements and passes through a central line of the photodiode array; wherein the central line of the photodiode array is a line connecting centers of the plurality of light intensity measurement elements.