Visualization of ultrasonic wave field by stroboscopic polarization selective imaging

Area of Science:

• Optics and Photonics
• Acoustics
• Materials Science

Background:

• Conventional photo-elastic techniques detect optical phase differences for ultrasonic visualization.
• Existing methods have limitations in quantitatively evaluating ultrasonic pressure distribution.
• Dynamic visualization of ultrasonic wave propagation in transparent media remains a challenge.

Purpose of the Study:

• To develop a stroboscopic method for dynamic visualization of ultrasonic waves.
• To enable quantitative evaluation of ultrasonic pressure distribution in transparent materials.
• To explore new optical parameters sensitive to ultrasonic wave-induced refractive index changes.

Main Methods:

• Utilizing polarization selective imaging in a stroboscopic setup.
• Acquiring multiple independent polarization parametric images.
• Analyzing azimuthal angle (φ) and Stokes parameter (S2) of polarized light.

Main Results:

• Successfully visualized dynamic ultrasonic wave propagation.
• Quantitatively evaluated the ultrasonic pressure distribution in quartz.
• Demonstrated high sensitivity of azimuthal angle and Stokes parameter to refractive index variations.

Conclusions:

• The proposed stroboscopic polarization imaging method provides a new approach for ultrasonic field visualization.
• This technique offers quantitative analysis beyond conventional optical phase difference measurements.
• It opens new possibilities for studying ultrasonic wave interactions with transparent materials.