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 periodicals archive ?
In contrast to Skittone, with his patronizing smile and gratingly cheerful demeanor, she seemed competent and genuinely nice.
3 Ironically enough, Ugre}i3/4 indulges in the same kind of generalizations in Have a Nice Day (1993) when she turns her Eastern gaze on the American cult of the "organizer," joggers, television, advertising, and an all-pervasive, gratingly superficial American happiness.
I feel irritated when he says "the odds of reward", although I don't know why, and I feel gratingly irritated when he says "they've entered the go-zone".
In general, though, the performances are on the bland side, the orchestrations gratingly brassy.
Instead, The Swan of Tuonela--a gratingly popular work--was performed.
In fact, the harmonies rendered by the keyboardist move at a pace sometimes gratingly different from that of the vocal parts.
Seven Moves, which tries to be a psychological novel and a quasi-mystery, has a distinct plot that is nonetheless eclipsed by its characters' urbanely self-conscious, gratingly allusive chatter.
With all the spontaneity of Kabuki theater, and a level of self-congratulation unmatched by Disney/Cap Cities annual reports, Wall Street Week follows a rigidly ritualized format, presided over by its harlequin-faced and gratingly smug host, Louis Rukeyser.
I do hope you won't mind my saying this, says Keith gratingly, but my wife and I have come down here "to get away from the hurly-burly of town life, the hustle and bustle of living in an urban conurbation.
He features predominantly in the second-half, and his outlandish behaviour as a fading musician, Shakti Kumar, is gratingly over-the-top and over theatrical.
Speaking for this less cluelessly predisposed group, we remind TV scriptwriters that there are more effective and convincing ways to make gratingly improbable plot twists more believable.
Warm and engaging when it focuses on Hunt as an uptight New Yorker learning to mellow out on the beaches of Los Angeles, the film turns gratingly forced whenever her naive, angsty son steps into the frame, occasioning so much self-involved mother-son bickering you long for a tidal wave to come along and sweep them both out to sea.