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Updated: Feb 9, 2026

Calibration Procedures for Orthogonal Superposition Rheology
Published on: November 18, 2020
Traceable Dynamic Calibration of Force Transducers by Primary Means
Nicholas Vlajic1, Ako Chijioke2
1National Institute of Standards and Technology, Gaithersburg, MD 20899, USA. nicholas.vlajic@nist.gov.
Abstract:
We describe an apparatus for traceable, dynamic calibration of force transducers using harmonic excitation, and report calibration measurements of force transducers using this apparatus. In this system, the force applied to the transducer is produced by the acceleration of an attached mass, and is determined according to Newton's second law, F = ma. The acceleration is measured by primary means, using laser interferometry. The capabilities of this system are demonstrated by performing dynamic calibrations of two shear-web-type force transducers up to a frequency of 2 kHz, with an expanded uncertainty below 1.2 %. We give an accounting of all significant sources of uncertainty, including a detailed consideration of the effects of dynamic tilting (rocking), which is a leading source of uncertainty in such harmonic force calibration systems.
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