grism
English edit
Etymology edit
Pronunciation edit
- Rhymes: -ɪzəm
Noun edit
grism (plural grisms)
- A combination of diffraction grating and prism used to obtain spectra from selected parts of an image.
- Synonym: grating prism
- The advantage of grisms is that the same camera can be used both for imaging (without the grism) and spectroscopy (with the grism) without having to be moved.
- 1987, Daniel J. Schroeder, Astronomical Optics, Academic Press, page 302:
- If this grism is placed in an ƒ/4 beam at s = 120 mm, the plate factor P ≈ 1100 Å/mm.
- 1994, T. M. Herbst, J. T. Rayner, “First Experiences With A Solid ZnSe Grism for Near Infrared Astronomy”, in Ian S. McLean, editor, Infrared Astronomy with Arrays, Springer,, page 515:
- As the name implies, grisms are a combination of a transmission grating and a prism. One common configuration uses the refraction at the grism surface to redirect nonzero diffractive orders along the original optical path.
- 2010, Frederick R. Chromey, To Measure the Sky, Cambridge University Press, page 382:
- The grism usually consists of an SR transmission grating mounted on the hypotenuse of a right-angle prism. […] Volumetric phase holographic grisms, which are capable of relatively high angular dispersions, have begun to appear.
Translations edit
combination of diffraction grating and prism
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