A novel ultrasonic method for measuring minute sinusoidal displacement by network analyzer.

Area of Science:

• Physics
• Materials Science
• Engineering

Background:

• Estimating viscoelastic parameters requires precise measurement of object displacement.
• Traditional methods struggle to accurately measure small, micrometer-scale sinusoidal displacements induced by ultrasonic forces.

Purpose of the Study:

• To develop a stable and accurate method for measuring micrometer-scale sinusoidal displacements.
• To enable reliable estimation of viscoelastic parameters using ultrasonic excitation.

Main Methods:

• Proposed a novel method utilizing a network analyzer to measure the S parameter of reflected ultrasonic waves.
• Theoretically formulated the relationship between S parameters, inverse Fourier transform, and displacement amplitude.
• Applied the method to measure sinusoidal displacements on an object in a water tank experiment.

Main Results:

• Successfully measured sinusoidal displacements on the order of micrometers (10-300 Hz).
• Obtained results showed excellent agreement with reference measurements from a laser displacement meter.
• Demonstrated the capability of the network analyzer method for accurate micro-displacement measurement.

Conclusions:

• The proposed network analyzer method provides accurate measurement of minute sinusoidal displacements.
• This technique overcomes the limitations of previous methods in stably measuring small amplitudes.
• Enables precise characterization of material viscoelastic properties through micro-displacement analysis.