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Accelerating the phase demodulation process based on a parallel Hilbert transform with overlapping computation for a
Optics Letters
|January 16, 2025
Summary
A new parallel Hilbert transform arctangent phase demodulation (PHT-ATAN) method speeds up laser Doppler vibrometer analysis by over 100% using overlapping computation. This technique enhances real-time sensing applications by improving computation speed without sacrificing accuracy.
Area of Science:
- Optics and Photonics
- Signal Processing
- Measurement Science and Metrology
Background:
- Laser heterodyne Doppler vibrometers are crucial for precise motion and vibration measurement.
- Traditional phase demodulation methods can be computationally intensive, limiting real-time applications.
- Endpoint effects in signal processing can reduce the accuracy of phase demodulation.
Purpose of the Study:
- To introduce a novel parallel Hilbert transform arctangent phase demodulation (PHT-ATAN) method.
- To enhance the computational speed and efficiency of phase demodulation for laser Doppler vibrometers.
- To address and mitigate endpoint effects in phase demodulation algorithms.
Main Methods:
- Developed a PHT-ATAN method incorporating overlapping computation and data concatenation.
- Implemented parallel processing techniques to accelerate the demodulation algorithm.
- Validated the method through simulations and experimental measurements.
Main Results:
- The PHT-ATAN method effectively suppresses endpoint effects.
- Parallel processing with a parallelism of ≥4 resulted in over 100% increase in computation speed compared to traditional methods.
- The method maintained high signal-to-noise ratio and accuracy in phase demodulation results.
Conclusions:
- The PHT-ATAN method significantly accelerates phase demodulation for laser Doppler vibrometers.
- This technique is well-suited for large bandwidth, embedded, and real-time sensing applications.
- The PHT-ATAN method offers a robust and efficient solution for advanced vibration analysis.
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