Combined digital-analog two-beam vibrating accelerometer having linear output across complete range

WO2026062631A1PCT designated stage Publication Date: 2026-03-26ISRAEL AEROSPACE IND LTD
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Filing Date
2025-03-20
Publication Date
2026-03-26

AI Technical Summary

Technical Problem

Conventional vibrating beam accelerometers experience a 'blind zone' due to the lock-in phenomenon where the resonant frequencies of the two beams become locked, leading to a zero output despite external acceleration, limiting their usable range.

Method used

Measure both dominant and sub-dominant frequencies outside the lock-in zone and amplitudes within the lock-in zone to derive acceleration, using direct measurements of dominant frequencies and amplitudes to achieve linearity across the complete range without additional processing.

Benefits of technology

The solution provides a linear output across the complete range of accelerations, avoiding the need for supplementary processing and maintaining accuracy by directly measuring dominant frequencies and amplitudes, while allowing for alternative computations using sub-dominant amplitudes if necessary.

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    Figure IL2025050266_26032026_PF_FP_ABST
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Abstract

A vibrating beam accelerometer (10) can be modelled mathematically as a system having two beams (11, 11') operating in a differential push-pull mode, such that each of the two beams vibrates at corresponding first and second frequencies of vibration (f+, f-) at which the respective amplitude (A+, A-) is dominant outside a predetermined lock-in zone within which the respective dominant frequencies (f 1, f 2) of the first and second beam are equal. Acceleration is determined inside a predefined range that includes the lock-in zone, as a function of measured vibration amplitudes of the two beams. Outside the predefined range, acceleration is derived as a function of a difference between the measured vibration frequencies of the two beams.
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Citation Information

Patent Citations

  • IL318446A

  • IL315720A