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Thermoelastic wave generation and its longitudinal wave propagation measurement by a microscopic optical
Kazuki Tamura1, Ken-Ya Hashimoto2, Shinpei Okawa1
1Hamamatsu University School of Medicine, 1-20-1 Handayama, Chuo-ku, Hamamatsu city, Shizuoka 431-3192, Japan.
Ultrasonics
|April 30, 2024
Summary
This study compared laser ultrasonics using Michelson and Sagnac interferometers for pulsed thermoelastic wave measurement. The Sagnac interferometer offered better signal-to-noise ratio, while combining both reduced measurement time.
Area of Science:
- Physics
- Materials Science
- Optical Engineering
Background:
- Laser ultrasonics is a noncontact method for elastic wave analysis.
- Optical interferometers are crucial for tracking surface displacement.
- Pulsed thermoelastic waves require precise measurement techniques.
Purpose of the Study:
- To compare the performance of Michelson and Sagnac interferometers for measuring pulsed thermoelastic waves.
- To evaluate the accuracy of numerically estimated Sagnac interferometer outputs.
- To determine the optimal combination of interferometers for efficient measurement.
Main Methods:
- Utilized laser ultrasonics with a pulsed laser to generate thermoelastic waves.
- Employed Michelson and Sagnac interferometers to measure out-of-plane displacement.
- Compared experimental results with numerically simulated Sagnac interferometer outputs.
Main Results:
- Sagnac interferometer achieved a higher signal-to-noise ratio (19.2 dB) than Michelson (14.9 dB).
- Michelson interferometer demonstrated superior displacement output linearity, enabling sound pressure calculation.
- Numerically estimated Sagnac outputs matched experimental data, validating the simulation.
Conclusions:
- The Sagnac interferometer is more sensitive for pulsed thermoelastic wave detection.
- Combining Michelson and Sagnac interferometers reduces measurement time without compromising data quality.
- Michelson interferometer's linearity is advantageous for quantitative pressure analysis.
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