Phase-modulated fiber optic Fizeau interferometer for measuring shock induced vibration

Area of Science:

• Optics and Photonics
• Mechanical Engineering
• Materials Science

Background:

• Fiber displacement interferometers offer simple, low-cost, and precise measurement of shock-induced vibrations.
• Harsh shock environments present challenges: light intensity fluctuations, fiber disturbances, and bidirectional measurement needs.
• Existing methods fail to address all critical requirements for shock vibration measurement.

Purpose of the Study:

• To propose a novel phase-modulated fiber Fizeau interferometer.
• To address the limitations of current methods in measuring shock-induced vibrations.
• To overcome challenges like light intensity fluctuations and fiber disturbances.

Main Methods:

• Development of a phase-modulated fiber Fizeau interferometer.
• Theoretical analysis of the interferometer's performance.
• Experimental validation of the proposed approach.
• Strategies for mitigating measurement deviations were developed and analyzed.

Main Results:

• The proposed interferometer demonstrates effectiveness in measuring shock-induced vibrations.
• Identified potential deviations and developed mitigation strategies.
• Analysis confirmed the impact of mitigation methods on reducing measurement errors.

Conclusions:

• The phase-modulated fiber Fizeau interferometer is a robust solution for shock-induced vibration measurement.
• The developed strategies effectively reduce measurement errors in harsh environments.
• This approach enhances the feasibility of precise shock vibration monitoring.