A method for calibrating the line-focus-beam acoustic microscopy system.

Area of Science:

• Materials Science
• Acoustics
• Surface Science

Background:

• Acoustic microscopy is crucial for material characterization.
• Accurate measurement of leaky surface acoustic wave (LSAW) velocity and attenuation is essential for understanding material properties.
• Existing methods require precise system calibration.

Purpose of the Study:

• To investigate the absolute accuracy of the line-focus-beam (LFB) acoustic microscopy system.
• To propose and demonstrate a system calibration method for LSAW measurements.
• To establish a standard specimen for acoustic property measurements.

Main Methods:

• Utilized single crystal gadolinium gallium garnet (GGG) as a standard specimen with accurately measured bulk acoustic properties.
• Measured LSAW propagation characteristics using LFB acoustic microscopy.
• Compared experimental LSAW data with theoretical calculations based on measured bulk properties.
• Employed two LFB acoustic lens devices with a 1-mm radius cylindrical concave surface for calibration.

Main Results:

• Demonstrated a method for calibrating LFB acoustic microscopy systems.
• Achieved accurate measurements of LSAW velocity and attenuation.
• Validated the use of GGG substrates as standard specimens for acoustic property determination.
• Calibration was successfully performed in the frequency range of 100 to 300 MHz.

Conclusions:

• The proposed calibration method enhances the absolute accuracy of LFB acoustic microscopy for LSAW measurements.
• Standard specimens with well-characterized bulk acoustic properties are vital for system calibration.
• This work provides a reliable approach for accurate acoustic material characterization.