Full-field vibrometry using a Fabry-Perot étalon interferometer

Area of Science:

• Optics and Photonics
• Vibrational Spectroscopy
• Materials Science

Background:

• Fabry-Perot étalons are optical resonators used in various spectroscopic applications.
• Vibrometry, the measurement of mechanical vibrations, is crucial in fields like structural health monitoring and acoustics.
• Lithium niobate is a versatile material with unique electro-optic and piezoelectric properties.

Purpose of the Study:

• To investigate the potential of a solid lithium niobate Fabry-Perot étalon for full-field vibrometry.
• To develop and validate theoretical models for system sensitivity and étalon behavior.
• To demonstrate the experimental capabilities for multi-point and scanned vibrometry.

Main Methods:

• Theoretical sensitivity predictions using signal-to-noise ratio calculations.
• Development and examination of optimized equations for étalon behavior.
• Experimental demonstration of simultaneous two-point detection and full-field scanned vibrometry.

Main Results:

• Theoretical sensitivity was predicted based on signal-to-noise calculations.
• Optimized equations for étalon behavior were developed and validated against experimental data.
• The étalon system successfully demonstrated simultaneous two-point detection and full-field scanned vibrometry.

Conclusions:

• The solid lithium niobate Fabry-Perot étalon shows significant potential for full-field vibrometry.
• The system is capable of advanced vibrometric measurements, including simultaneous multi-point detection.
• Future work may enable real-time imaging of ultrasonic wave fronts.