Abstract: A monochromator 100 includes: a diffraction grating 2 placed within a housing 1 so as to receive light from an entrance 11 and disperse the light into a spectrum from which a component of light having a set wavelength is to be extracted through an exit 12; an optical filter 92 to be removably inserted between the grating and the exit to remove light within a specific wavelength band which is out of the set wavelength; a rotary drive 5 for rotating the grating using a stepping motor; a wavelength-movement information setter 73 which sets wavelength-movement information to be used for rotating the grating from an original position to a rotational position corresponding to the set wavelength; and a wavelength-movement controller 71 which controls the rotary drive to initially rotate the grating to the original position and subsequently rotate it to the aforementioned rotational position based on the wavelength-movement information.

Abstract: A monochromator 100 includes: a diffraction grating 2 placed within a housing 1 so as to receive light from an entrance 11 and disperse the light into a spectrum from which a component of light having a set wavelength is to be extracted through an exit 12; an optical filter 92 to be removably inserted between the grating and the exit to remove light within a specific wavelength band which is out of the set wavelength; a rotary drive 5 for rotating the grating using a stepping motor; a wavelength-movement information setter 73 which sets wavelength-movement information to be used for rotating the grating from an original position to a rotational position corresponding to the set wavelength; and a wavelength-movement controller 71 which controls the rotary drive to initially rotate the grating to the original position and subsequently rotate it to the aforementioned rotational position based on the wavelength-movement information.

Abstract: Provided are a spectrometer capable of more effectively reducing stray light and an incident light limiting member to be used for the spectrometer. At least a part of light not entering an effective area of a diffraction grating is blocked by being reflected by a mask plate provided between an incidence plate and the diffraction grating. Further, the light reflected by the mask plate is attenuated in a trap space. Thus, the light blocked by the mask plate does not reach the diffraction grating side and does not function as a stray light source, so that stray light can be more effectively reduced.

Abstract: A spectrophotometer in which output ends of optical fibers are one-dimensionally arrayed in a z-axis direction on an output end face of a fiber box. That is to say, a two-dimensional area image of a display screen picked up through input ends arranged at 10×10 lattice points on an input end face of optical fibers is converted into a one-dimensional image inside the fiber box and projected from output ends on the output end face in the form of a one-dimensional area image parallel to the z-axis. This one-dimensional area image has position information of 100 measurement points in the z-axis direction.