Magnetic sensor for building structural vibrations

Area of Science:

• Electrical Engineering
• Sensor Technology
• Physics

Background:

• Traditional displacement sensors can be expensive and complex.
• Monitoring structural health in buildings requires precise and real-time displacement measurements.

Purpose of the Study:

• To develop a novel, cost-effective displacement-to-frequency transducer.
• To achieve high-resolution real-time monitoring of structural element movements.

Main Methods:

• A Colpitts oscillator-based transducer was designed, leveraging changes in coil inductance with magnetic core insertion.
• A parallel tank circuit was employed for low-frequency operation and direct analysis.
• The sensor's dynamic range is determined by the coil length, allowing interchangeable core sensors.

Main Results:

• The transducer achieves a resolution exceeding 1/100,000.
• The system enables real-time measurement of vibrations, thermal expansion, and overload movements.
• The modular design allows for flexible measurement ranges using a single electronic system.

Conclusions:

• The developed displacement-to-frequency transducer offers a high-resolution, low-cost solution for structural health monitoring.
• Its design facilitates adaptable measurement ranges and real-time analysis of dynamic structural changes.