grism


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grism

[′griz·əm]
(spectroscopy)
A combination of a diffraction grating and a prism, wherein the grating spreads light into colors and the prism moves the spectrum's position to the point in an image where the observed object appears.
References in periodicals archive ?
CEA / IRFU has the following responsibilities in the Euclid project - Provision of equipment FPA (focal plane) and PMCU (engine control electronics and power) for the VIS instrument- Provision of equipment for cryomecanisme wheel filter holder (CM-FWA) and cryomecanisme for wheel door Grism (CM-GWA) for the NISP instrument.
The wheel holds colour filters that transmit a broad range of wavelengths as well as devices called grisms, which spread out incoming light in much the same way as a prism spreads sunlight into a rainbow of component colours.