Abstract
When homodyne quadrature techniques are used for primary vibration calibration at high frequencies the problem of low displacement amplitudes arises, which inhibits the accurate measurement of acceleration amplitude and initial phase. By exploiting the effect of disturbing motion caused e.g. by hum of the power amplifier or environmental vibrations, it is possible to still recover the displacement time history by phase unwrapping. However, it is then necessary to deal with the superimposed drift-like motion components. This contribution proposes two techniques to either include these components in the sine approximation or to apply a wavelet-based detrending technique. The performance and consistency of both methods are demonstrated by simulation tests, taking into account all significant influences known from real acceleration measurements, and by comparison of accordingly performed real calibrations with the respective calibration results with validated heterodyne techniques.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.