grating


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grating

(grāt′ing)
In spectrophotometry, the element used in a monochromator that disperses white light into the visible spectrum. It is composed of finely etched lines in the reflecting material.

grating

A series of black and white parallel bars of equal width used to measure visual acuity, contrast sensitivity, and resolution of optical systems. The grating can be either square-wave (also called Foucault grating or Foucault pattern), in which the luminance across a bar is constant, or sine-wave, in which the luminance varies sinusoidally (Fig. G6). See cycle per degree; contrast sensitivity function.
Fig. G6 Square-wave gratingenlarge picture
Fig. G6 Square-wave grating
References in classic literature ?
I plainly heard a noise upon the cover of my closet, like that of a cable, and the grating of it as it passed through the ring.
Here again I paused abruptly, and now with a feeling of wild amazement--for there could be no doubt whatever that, in this instance, I did actually hear (although from what direction it proceeded I found it impossible to say) a low and apparently distant, but harsh, protracted, and most unusual screaming or grating sound--the exact counterpart of what my fancy had already conjured up for the dragon's unnatural shriek as described by the romancer.
Even then he scarcely understood what this indicated, until he heard a muffled grating sound and saw the black mark jerk forward an inch or so.
Oh, yes," said Buckingham, grating his teeth with rage.
Through the grating, however, Dantes saw they were passing through the Rue Caisserie, and by the Rue Saint-Laurent and the Rue Taramis, to the port.
These gentlemen, Comminges, are not prisoners," returned Mazarin, with his ironical smile, "only guests; but guests so precious that I have put a grating before each of their windows and bolts to their doors, that they may not refuse to continue my visitors.
Nothing of her ever comes to light - no grating, no lifebuoy, no piece of boat or branded oar - to give a hint of the place and date of her sudden end.
He somehow felt that the sound of his own rude voice would be grating just then.
Monk may not have as much pride as I have; for I declare if any one had put me into a coffer with that grating over my mouth, and carried me packed up, like a calf, across the seas, I should cherish such a memory of my piteous looks in that coffer, and such an ugly animosity against him who had inclosed me in it, I should dread so greatly to see a sarcastic smile blooming upon the face of the malicious wretch, or in his attitude any grotesque imitation of my position in the box, that, Mordioux
There was also a very small grating which let in a very little fresh air: the massive foundations had been tunnelled in one place; a rude alcove was the result, with this grating at the end and top of it, some seven feet above the earth floor.
A huge cellar had been constructed there, closed by an old iron grating, which was out of order, into which were cast not only the human remains, which were taken from the chains of Montfauçon, but also the bodies of all the unfortunates executed on the other permanent gibbets of Paris.
Clinging to the grating for support he dared not turn his head in the direction of the beasts behind him.