SPECTRAL INSTRUMENT, HYPERSPECTRAL MEASUREMENT SYSTEM, AND SPECTROSCOPIC METHOD

摘要

To provide a spectral instrument capable of imaging diffraction image of each slit in a separated manner while improving wavelength resolution.SOLUTION: The spectral instrument comprises: a slit mechanism formed by arranging a plurality of slits receiving light from a target in a slit width direction; a first diffraction grating provided so as to receive light travelling via a collimation optical element; and a second diffraction grating provided to receive light split by wavelength via the first diffraction grating. Lattice spacing of the first diffraction grating is different from that of the second diffraction grating. When an optical path from the slit mechanism to a detector is viewed along a direction of travel, a diffracted orientation of the first diffraction grating with zero-th diffraction light as reference and a diffracted orientation of the second diffraction grating with zero-th diffraction light as reference are different from one another.SELECTED DRAWING: Figure 1