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Wideband Optical Detector of Ultrasound for Medical Imaging Applications

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Published on: May 11, 2014

Continuous wavelet transform for non-stationary vibration detection with phase-OTDR.

Zengguang Qin¹, Liang Chen, Xiaoyi Bao

¹Department of Physics, University of Ottawa, Ottawa, ON K1N 6N5, Canada. qzengguang1984@gmail.com

|October 6, 2012

Summary

Continuous wavelet transform enables precise non-stationary vibration measurement using distributed fiber optic sensors. This method accurately pinpoints vibration events in both time and frequency, enhancing distributed sensing capabilities.

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Area of Science:

Optoelectronics
Signal Processing
Fiber Optic Sensing

Background:

Non-stationary vibration monitoring requires advanced sensing techniques.
Phase optical time-domain reflectometry (OTDR) offers distributed sensing capabilities.
Existing methods may lack simultaneous time-frequency resolution for complex vibrations.

Purpose of the Study:

To introduce continuous wavelet transform (CWT) for analyzing non-stationary vibrations.
To develop a CWT-based method for accurate vibration localization.
To demonstrate the effectiveness of CWT with phase OTDR for vibration measurement.

Main Methods:

Utilizing continuous wavelet transform (CWT) for time-frequency analysis.
Applying wavelet ridge detection to extract frequency evolution from scalograms.
Implementing a global wavelet spectrum algorithm for vibration source localization.
Employing phase optical time-domain reflectometry (OTDR) with single-mode fiber.

Main Results:

Simultaneous time and frequency information of vibration events were successfully obtained.
Frequency evolution of vibrations was accurately determined using wavelet ridge detection.
Vibration locations were precisely identified using the global wavelet spectrum algorithm.
Demonstrated distributed vibration measurements for 500 Hz and 500 Hz to 1 kHz sweep events over a 20 cm fiber length.

Conclusions:

Continuous wavelet transform is effective for non-stationary vibration analysis in distributed fiber optic sensing.
The proposed CWT-based method provides accurate time-frequency and localization information.
Phase OTDR combined with CWT offers a robust solution for advanced vibration monitoring.