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 ?
CAROLINE O'Shea is a gratingly loud woman whose achievements in life amount to one O-level and an eating disorder.
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.
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.
She doesn't veer towards being gratingly chirpy, despite being a go-getter reporter with a nose for news.
This is no less than an arrangement of the Brahms Violin Concerto, regarded by many as among the world's greatest, but one which Lazic feels was written slightly gratingly against the violin, when Brahms always composed at the piano.
Yet there she is, all snooty and gratingly enamoured with her own special place in the world, disregarding the fact that her major life achievement to date has been to snare a pensioner.
You know something is wrong when Tom finally reacts to Rachel's gratingly sunny disposition with the regretful admission that he's hired a hit man to kill her, and pleads with her to run away before he shows up.
Of course he's got a lot to run from - Pennant-Rea is just ghastly (by which I mean superb) as the gratingly girly, high-maintenance Sibyl, who Elyot has chosen as an antidote to the type of passion which tore him and his first wife apart.