Sweep oscillation control technology using an ultrasonic probe for controlling resonance phenomena and nonlinear phenomena.

The Ultrasonic System Research Institute is applying and developing manufacturing technology for original ultrasonic probes. We have developed technology to control the nonlinear vibration phenomena of surface elastic waves through oscillation control techniques based on the acoustic characteristics of the probes, and we provide consulting services for various ultrasonic utilization technologies.
The key point is the optimization of the ultrasonic propagation section (Note).
Note: By relaxing and homogenizing surface residual stress, stable ultrasonic oscillation control becomes possible.
Setting technology for oscillation control conditions:
1) Setting of oscillation waveforms corresponding to the vibration modes of devices and equipment.
2) Setting of sweep conditions corresponding to the vibration modes of devices and equipment.
3) Setting of output levels corresponding to the vibration modes of devices and equipment.
To achieve this, it is important to evaluate the characteristics related to ultrasonic propagation conditions through operational verification of the ultrasonic propagation characteristics of the original probe (sound pressure level, frequency range, nonlinearity, dynamic characteristics, etc.).
Ultrasonic propagation characteristics:
1) Detection of vibration modes (changes in autocorrelation).
2) Detection of nonlinear phenomena (changes in bispectrum).
3) Detection of response characteristics (impulse response).
4) Detection of interactions (power contribution rate).


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