Real-time performance improvement of an interferometric fiber-optic vibration sensor based on phase shift...

Area of Science:

• Optoelectronics
• Sensor Technology
• Signal Processing

Background:

• Fiber-optic sensors are crucial for vibration monitoring.
• Heterodyne detection is a common method for fiber-optic sensing.
• Traditional demodulation methods can be slow, limiting real-time applications.

Purpose of the Study:

• To propose a fast demodulation method for fiber-optic vibration sensors.
• To accelerate the phase demodulation process using phase shift integration (PSI).
• To improve the real-time performance and demodulated effect of sensing systems.

Main Methods:

• Developed a phase shift integration (PSI) based demodulation technique.
• Utilized the phase relationship between adjacent sampling points within a heterodyne carrier period.
• Employed basic algebraic calculations for vibration signal recovery.

Main Results:

• Achieved a demodulation speed at least seventy times higher than traditional methods.
• Demonstrated further speed improvement by adjusting carrier frequency.
• Suppressed high-order harmonic terms in demodulation by at least 18.5 dB.

Conclusions:

• The PSI method significantly accelerates phase demodulation in fiber-optic vibration sensors.
• This technique enhances real-time sensing capabilities and improves demodulated signal quality.
• The method shows promise for advanced vibration monitoring systems.