China's vibration measurement has reached the international advanced level
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October 04 23:08:04, 2025
On June 6, the "0.1Hz–50kHz Vibration Amplitude and Phase Measurement Reference System" developed by the China Institute of Metrology successfully passed expert evaluation. Experts noted that the system's key technical parameters have reached international advanced levels, with some even surpassing global standards. This achievement marks a significant step forward in metrology and vibration measurement technology.
This new national vibration reference and phase characteristics system is part of an improvement project under the AQSIQ (Administration of Quality Supervision, Inspection and Quarantine). It includes high-frequency (2kHz–50kHz), intermediate-frequency (20Hz–2kHz), and low-frequency (10Hz–10kHz) horizontal and vertical vibration references, all designed to serve as benchmarks for accurate measurements.
Vibration measurement is a crucial aspect of dynamic testing, widely applied in fields such as mechanical fault diagnosis, modal analysis, seismic monitoring, and object detection. As the national economy and high-tech industries grow rapidly, the demand for precise vibration measurement has increased. Not only is amplitude-frequency characteristic testing required, but phase-frequency characteristics must also be evaluated simultaneously.
To meet these growing demands, researchers at the Institute of Mechanics and Acoustics of the China Institute of Metrology spent three years conducting in-depth research and achieved several innovative technological breakthroughs.
In the low-frequency vertical sub-reference system, a low-frequency vibration standard was developed. For the first time in the Asia-Pacific region, the zero-difference sinusoidal approximation method was used for dynamic phase demodulation, enabling accurate measurement of acceleration sensitivity amplitude and phase shift at 1Hz. This innovation extended the measurable range down to 0.1Hz. Several new techniques were also introduced, including the heterodyne time interval method based on peak and valley, the improved heterodyne sinusoidal approximation method, and the enhanced homodyne interval method. These developments represent major theoretical and practical advances, placing the system at the forefront internationally.
On the piezoelectric high-frequency (2kHz–50kHz) vibration table, heterodyne technology was applied for the first time globally, allowing precise measurement of sensitivity amplitude and phase shift for nano-scale vibration sensors within a range of 1–500nm.
Meanwhile, on the electromagnetic intermediate-frequency vibration reference table, heterodyne technology was implemented for the first time in China, enabling accurate calibration of sensitivity amplitude and phase characteristics. This allowed the intermediate-frequency reference to expand from 20Hz–2kHz to 10Hz–10kHz.
Based on this research, three sets of high, medium, and low-frequency benchmarks (sub-benchmarks) have conducted bilateral comparisons with Germany’s Physikalisch-Technische Bundesanstalt (PTB) across the 10Hz–10kHz range. This achievement provides a critical technical foundation for China’s highest level of international mutual recognition in vibration calibration capabilities (CMC).