Transcription of FLATNESS CONVERSION TABLE - Universal Photonics
1 UNIVERSALPHOTONICSINCORPORATEDSOURCE: ZYGO CORP. AND DYNASIL Surfacing Products & Technology T: T: FLATNESS CONVERSION TABLECONVERSION TABLE *Millimeters or inches is wavelength dependent. Assumes reference = 588nmNumber of BandsMicroinches (Millionths of an inch) microinch = one millionth of an inch = .000001 term microinch is a convenient way of saying one millionth of an inch. A popular term used with sur-face finish measurement, microinch specifies an average value for surface finish. Here, microinchand millionth of aninch are used many purposes, it is sufficient to take 1 band-10 microinches or To make a true tes, bothparts being tested, the work and optical flat, must be allowed to acclimate to the surrounding temperatures at the timeof the test.
2 Testing two flats at different temperatures will resut in an untrue surface: finger pressure at edgesConcave surface: finger pressure at center
