Spectral imaging device adjustment method and spectral imaging system

A method of adjusting a spectroscopic imaging device comprising a collimating lens that collimates input light, a diffraction grating that receives light collimated by the collimating lens and outputs the light in different directions in accordance with a wavelength of the light, a condensing lens that condenses light outputted from the diffraction grating at different positions in accordance with a wavelength of the light, and an array light receiving unit that includes a plurality of light receiving sensors that are arranged in an array along a predetermined line and receives light condensed by the condensing lens by using one of the light receiving sensors, wherein

• an etalon filter is disposed on an optical path of light inputted to the collimating lens, and
• a relative arrangement relationship among the collimating lens, the diffraction grating, the condensing lens, and the array light receiving unit is adjusted so that, in a state where light that has passed through the etalon filter is inputted to the spectroscopic imaging device, a focal point of light of each wavelength condensed by the condensing lens is positioned on the predetermined line.