STUDY ON A SIMPLIFIED IMPLEMENTATION OF HOMODYNE TIA METHOD FOR LOW FREQUENCY PRIMARY VIBRATION CALIBRATION

Qiao Sun, Chenguang Cai

Abstract

In this paper, the shortcomings and their causes of the conventional homodyne time interval analysis (TIA) method is described with respect to its software algorithm and hardware implementation, based on which a simplified TIA method is proposed with the help of virtual instrument technology. Equipped with an ordinary Michelson interferometer and dual channel synchronous data acquisition card, the primary vibration calibration system using the simplified method can perform measurements of complex sensitivity of accelerometers accurately, meeting the uncertainty requirements laid down in pertaining ISO standard. The validity and accuracy of the simplified TIA method is verified by simulation and comparison experiments with its performance analyzed. This simplified method is recommended to apply in national metrology institute of developing countries and industrial primary vibration calibration labs for its simplified algorithm and low requirements on hardware.

Keywords

primary vibration calibration, time interval analysis method, homodyne interferometry

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IMEKO-TC22-2010-NP-009.pdf

DOI

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IMEKO TC

TC22 - Vibration Measurement

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