Calibration Standard
Standardized testing protocols define primary and secondary methods for the calibration of vibration and shock transducers. ISO 16063 establishes mathematical procedures and experimental setups for determining sensitivity, phase response and transverse sensitivity across specified frequency ranges. Standardized methods ensure measurement comparability across international calibration laboratories.
Instrumentation specs mandate strict adherence to these calibration methodologies for accredited measurement certification.
Optical Measurement
Primary calibration uses laser interferometry to measure absolute displacement and velocity of acceleration test platforms. Interferometric techniques measure motion directly against optical light wavelengths, eliminating dependence on reference accelerometers. Secondary calibration methods use comparison techniques, mounting reference and test transducers back-to-back on vibration exciters.
Signal analysis algorithms derive sensitivity values by comparing electrical outputs against known reference inputs.
Temperature Effect
Environmental conditions introduce measurement uncertainty during sensor calibration routines. Temperature variations alter transducer sensitivity and change mechanical property values within test mounting structures. Base strain and transverse motion introduce parasitic outputs that distort primary axis calibration data.
Measurement laboratories control ambient conditions tightly to keep environmental uncertainty components within accredited error budgets.
Metrology Traceability
Accredited calibration facilities document measurement uncertainty chains back to primary national metrology institutes. Verification certificates record magnitude and phase response curves alongside calculated expanded uncertainty values. Quality standards mandate periodic recalibration of reference transducers to maintain valid measurement traceability.
