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A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings

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Vibration sensing using a tapered bend-insensitive fiber based Mach-Zehnder interferometer.

Yanping Xu¹, Ping Lu, Zengguang Qin

¹Department of Physics, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada.

|March 14, 2013

Summary

A new fiber-optic sensor using a Mach-Zehnder interferometer enables precise measurement of both damped and continuous vibrations. This novel sensor design offers enhanced strength and reduced interference for broad frequency detection.

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Area of Science:

Optics and Photonics
Sensor Technology
Mechanical Engineering

Background:

Vibration measurement is critical in many engineering applications.
Existing sensors face limitations in dynamic range and environmental robustness.
Fiber-optic sensors offer potential for high sensitivity and remote sensing.

Purpose of the Study:

To develop a novel fiber-optic sensor for comprehensive vibration measurement.
To enhance sensor performance through a specialized fiber structure.
To demonstrate the sensor's capability across a wide frequency spectrum.

Main Methods:

Design and fabrication of a Mach-Zehnder interferometer using tapered bend-insensitive fiber.
Incorporation of a double cladding structure and central coating for mechanical stability and signal uniformity.
Experimental validation of the sensor's response to damped and continuous vibrations.

Main Results:

Successful demonstration of damped vibration measurement within the 29-60 Hz range.
Successful demonstration of continuous vibration detection from 1 Hz up to 500 kHz.
The sensor exhibited enhanced mechanical strength and reduced susceptibility to external disturbances.

Conclusions:

The developed fiber-optic sensor effectively measures a broad range of vibrations.
The specialized in-fiber interferometer design enhances sensor durability and signal quality.
This technology holds promise for advanced vibration monitoring applications.