Vibration Calibration Techniques for Low-Frequency Sensors

Low-frequency vibration sensors, operating typically below 10 Hz, are critical in seismology, structural health monitoring and aerospace navigation. Accurate calibration of these devices ensures reliable detection of minute accelerations caused by natural phenomena or mechanical strains. Traditional calibration approaches rely on laser interferometry, which tracks displacement via optical interference fringes, but this method suffers from decreased accuracy at the lowest frequencies, high cost and environmental constraints. Alternative techniques exploit Earth’s gravitation as a reference, using static tilting or pendulum arrangements to generate known accelerations near 0.01 Hz. More recent advances employ monocular vision systems coupled with long-stroke shakers to capture spatial motion without complex synchronisation, thus extending reliable calibration down to millihertz ranges. Development of ultra-low-frequency exciters with long-stroke magnetic circuits has also improved the delivery of uniform acceleration waveforms. Emerging digital image processing and interferometric fringe counting have been integrated into automated primary systems, adhering to international standards and reducing human intervention. Together, these innovations enhance measurement repeatability, reduce installation errors and broaden the operational envelope of low-frequency sensor calibration worldwide.

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Vibration Calibration Techniques for Low-Frequency Sensors publication trend

The graph below shows the total number of articles in vibration calibration techniques for low-frequency sensors across all publications each year (not limited to Nature Index journals).

Technical terms

Calibration: Process of quantifying and adjusting sensor output to match known input stimuli.

Laser interferometry: Optical technique using interference of laser beams to measure displacement with high precision.

Monocular vision method: Image-based approach employing a single camera to track and quantify sensor movement.

Fringe counting method: Interferometric technique that counts interference fringes to determine displacement amplitudes.

Sensitivity: Ratio of sensor output signal to applied acceleration, indicating measurement responsiveness.

References

1. Monocular vision-based low-frequency vibration calibration method with correction of the guideway bending in a long-stroke shaker.. Optics Express (2019).
2. Monocular Vision-Based Earth’s Graviation Method Used for Low-Frequency Vibration Calibration. IEEE Access (2020).
3. Rectangular Closed Double Magnetic Circuit Offering Ultra-Long Stroke for Ultra-Low-Frequency Vibration Exciter. Applied Sciences (2020).
4. Primary calibration system for vibration transducers from 0.4 Hz to 160 Hz. Journal of Physics Conference Series (2015).
5. Monocular vision-based dynamic calibration method for determining the sensitivities of low-frequency tri-axial vibration sensors.. Optics Express (2024).