Meaning
Ultra-low expansion glass-ceramic reference artifacts manufactured from zero-expansion glass materials provide stable physical dimension standards for calibrating high-precision optical profilers and coordinate measuring machines. Utilizing a zerodur calibration block eliminates measurement errors caused by ambient temperature fluctuations in metrology laboratories. The material exhibits a coefficient of thermal expansion near zero across standard operating temperatures, making it an ideal substrate for micro-etched step heights and optical flatness standards.
Quality labs rely on these artifacts to verify instrument accuracy.
Thermal Stability
Near-zero thermal expansion prevents dimensional expansion or contraction when ambient laboratory temperatures shift during calibration routines. Using a zerodur calibration block guarantees that step height standards maintain true physical dimensions regardless of HVAC cycling. Stable substrate dimensions remove thermal uncertainty from metrology error budgets.
Thermal immunity maintains calibration accuracy.
Surface Polish
Super-polishing techniques produce optical mirror surfaces on glass-ceramic substrates with surface roughness values below sub-nanometer levels. Etching reference step height patterns into a zerodur calibration block provides sharp geometric transitions for calibrating white light interferometers. Extremely flat reference surfaces enable accurate z-axis scaling.
Mirror finishes minimize optical measurement noise.
Metrological Traceability
Calibration values certified by national metrology institutes establish unbroken measurement chains to international standards. Regular calibration using a zerodur calibration block validates profilometer accuracy when measuring sub-micron tolerances on precision mould inserts. Calibration certificates record standard step heights and uncertainty limits.
Traceable standards satisfy stringent ISO quality management requirements.
