klaasist plaat mõõtevahendite tööpindade tasapinnalisuse mõõtmiseks
optical-grade piece of glass lapped and polished to be extremely flat on one or both sides, usually within a few millionths of an inch (about 25 nanometres)
Tasaparalleelklaasplaate kasutatakse koos monokromaatilise valgusega, et mõõta interferentsi abil teiste pindade tasasust, olgu need siis optilised, metallilised, keraamilised või muud.
Good to know
Kui tasaparalleelklaasplaat asetatakse teisele pinnale ja valgustatakse, peegelduvad valguslained nii plaadi alumiselt pinnalt kui ka pinnalt, millele see toetub ning see põhjustab nähtust, mis sarnaneb õhukese kile interferentsiga.
Optical flats are used with a monochromatic light to determine the flatness (surface accuracy) of other surfaces, whether optical, metallic, ceramic, or otherwise, by interference.
Good to know
When an optical flat is placed on another surface and illuminated, the light waves reflect off both the bottom surface of the flat and the surface it is resting on, and this causes a phenomenon similar to thin-film interference.
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