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Irregularity: Profilometer
CONTROLS: Form of actual surface relative to perfect form
RELATED TERMS: Form Error, Rt, Rq
UNITS: Linear units
SPECIFICATIONS MUST CONTAIN: Value (RMS, Peak-to-Valley, +/- Sag Error or combination) over an aperture
OPTIMAX PREFERRED SPECIFICATION: +/- Sag Error in units of microns
REASONS: Change is relative to the nominal form
MANUFACTURING STANDARDS: ISO 10110-12, OEOSC OPI.006
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Learn from the Experts
Find out more by downloading our technical note on Irregularity
Specifying And Measuring Spherical Surface Irregularity
Define surface irregularity for spherical surfaces, offer information on measurement methods for testing surface irregularities, and some specification guidelines.
