grating

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Related to Gratings: diffraction gratings

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 ?
And all this, the white walls, the moving steel, the floor plates under Solomon Rout's feet, the floors of iron grating above his head, the dusk and the gleams, uprose and sank continuously, with one accord, upon the harsh wash of the waves against the ship's side.
Don Quixote, feeling the roughness of the rope on his wrist, exclaimed, "Your grace seems to be grating rather than caressing my hand; treat it not so harshly, for it is not to blame for the offence my resolution has given you, nor is it just to wreak all your vengeance on so small a part; remember that one who loves so well should not revenge herself so cruelly.
The grating against the library-door aroused the young girl from the stupor in which she was plunged, and which almost amounted to insensibility.
It seemed as if she were asleep, and yet the grating of the lock would have been likely to waken her.
Suppose a young lady has just been warbling ('with a grating and uncertain sound') Shelley's exquisite lyric 'I arise from dreams of thee': how much nicer it would be, instead of your having to say "Oh, thank you, thank you
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
It was interrupted by a low, but harsh and protracted grating sound which seemed to come at once from every corner of the room.
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.
In the window opening he set small branches about an inch in diameter both vertically and horizontally, and so woven that they formed a substantial grating that could withstand the strength of a powerful animal.
Then suddenly the grating sound of a harsh voice was heard from the other side of the door, and the officer- with pale face and trembling lips- came out and passed through the waiting room, clutching his head.
It turned back and forth many times, leading, at last, into a small, circular chamber, the gloom of which was relieved by a faint light which found ingress through a tubular shaft several feet in diameter which rose from the center of the room's ceiling, upward to a distance of a hundred feet or more, where it terminated in a stone grating through which Tarzan could see a blue and sun-lit sky.
Clinging to the grating for support he dared not turn his head in the direction of the beasts behind him.