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Summary

We developed a new multi-wavelength differential coherent vibration measurement scheme. This system uses a single laser to accurately measure vibrations across multiple channels with improved signal quality.

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Area of Science:

Optics and Photonics
Vibration Sensing Technology

Background:

Accurate vibration measurement is crucial for various engineering applications.
Existing methods often face limitations in terms of cost, complexity, or multi-channel capabilities.

Purpose of the Study:

To propose and demonstrate a novel multi-wavelength differential coherent vibration (MDCV) measurement scheme.
To leverage a monolithically integrated Fabry-Pérot mode-locked laser diode (FP-MLLD) for enhanced vibration sensing.

Main Methods:

Utilizing multiple mutually coherent laser modes from a single FP-MLLD to create probing pairs.
Implementing multi-channel coherent detection with short-pulse waveforms for higher peak power and signal-to-noise ratio (SNR).

Main Results:

Achieved vibration frequency measurement from 5 Hz to 800 Hz with an SNR of approximately 20 dB.
Validated multi-channel measurement capability across three spectrally filtered wavelength channels.
Demonstrated accurate resolution of the target vibration frequency in all channels.

Conclusions:

The proposed MDCV scheme offers a simplified architecture and low cost.
Native multi-channel capability makes it suitable for multi-target or multi-directional vibration measurement.
The use of short-pulse waveforms enhances measurement performance compared to traditional schemes.