Abstract:
A method includes receiving collimated light from an optical imaging system and dividing the received light into multiple bands of wavelength. Each band is refocused onto a corresponding diffraction grating having an amplitude function matched to a point spread function (PSF) of the optical imaging system. The light that is not filtered out by the diffraction grating is transmitted onto a corresponding pixel array. An image is reconstructed from data provided by the pixel arrays for each band. The intensity of light scattered by each diffraction grating may be detected, with the image being reconstructed as a function of an average value of detected intensity of scattered light used to scale the known zero-order mode profile, which is added to the image on the pixel array.
Abstract:
A spectrometer includes a pair of crossed reflective gratings to effect a spectrally dispersed beam that is focussed to an array detector. The second grating is a plural grating with a surface formed of a first portion and a second portion. The first portion has a groove density for effecting ultraviolet in the dispersed beam. The second portion has a groove density for effecting visible radiation in the dispersed beam. A shutter blocks or exposes the second portion of the grating surface so as to select the first spectral range or the second spectral range for detection. The plural grating surface preferably may be contoured to compensate for aberrations in focussing of the beam to the detector. A computer may be used for selecting spectral lines for analysis, particularly selecting such lines in the second range that are not interfered with by the first range.
Abstract:
PROBLEM TO BE SOLVED: To provide a spectroscope system capable of simply taking up fine spectrum information of a course by measuring the spectrum of a light supplied from a light source. SOLUTION: The spectroscope comprises a holographic grating 14, an echelle grating 15, a rotary stage 16, and a line sensor 18. In the case of sensing a single pulse, a control processor 22 controls the stage 16 and rotates the grating 15 from a retro-disposition at a predetermined angle δ1. Meanwhile, in the case of sensing double pulses, the processor 22 controls the stage 16 and returns the grating 15 from the retro-disposition at a position rotated a predetermined angle δ2.