On-Demand: Cleaning Seminar Using Ultrasound and Fine Bubbles

The Ultrasonic System Research Institute is applying measurement, analysis, and evaluation techniques related to the propagation state of ultrasound to publish technology that relaxes the surface residual stress of ultrasonic transducers using ultrasound and fine bubbles. This technology for relaxing surface residual stress has made it possible to improve fatigue strength against metal fatigue. As a result, the effects on various components, including ultrasonic tanks, have been demonstrated. Ultrasonic Probe: Outline Specifications Measurement Range: 0.01 Hz to 200 MHz Oscillation Range: 1.0 kHz to 25 MHz Propagation Range: 0.5 kHz to over 900 MHz (confirmation of acoustic pressure data analysis) Materials: Stainless steel, LCP resin, silicon, Teflon, glass, etc. Oscillation Equipment: Example - Function Generator Measurement Equipment: Example - Oscilloscope By controlling oscillation, we achieve propagation states tailored to the objectives regarding sound pressure level, frequency, and dynamic characteristics. Ultrasonic Propagation Characteristics 1) Detection of vibration modes (changes in self-correlation) 2) Detection of nonlinear phenomena (changes in bispectrum) 3) Detection of response characteristics (analysis of impulse response) 4) Detection of interactions (analysis of power contribution rates)

The Ultrasonic System Research Institute utilizes a <degasification and microbubble generation liquid circulation system> to achieve effective ultrasonic control tailored to specific purposes. Explanation of Ultrasonic Liquid Circulation Technology 1) We use a dedicated ultrasonic tank (original manufacturing method). 2) The installation of the tank involves: 1: Using specialized materials. 2: Optimizing the natural vibration, ultrasonic frequency, and output. 3) The ultrasonic transducer is installed using specialized materials. (These materials can limit the utilization states of standing waves, cavitation, and acoustic flow.) 4) We use a degasification and microbubble generation device. (The standard dissolved oxygen concentration is 5-6 mg/l.) 5) The tank and ultrasonic transducer undergo surface modification. With the above settings and the diffusibility of microbubbles, a uniform cleaning liquid state is achieved. Ultrasonic waves propagate through the uniform liquid, generating a stable ultrasonic state. From this state, liquid circulation control is performed to realize the desired ultrasonic effects (propagation state). The operation control of the ultrasonic device, degasification device, liquid circulation pump, etc., is our expertise.

The Ultrasonic System Research Institute has published measurement and analysis data on ultrasonic sound pressure using its original product: an ultrasonic tester. << Measurement and Analysis of Ultrasonic Sound Pressure >> 1) By using feedback analysis through a multivariate autoregressive model, we will examine and evaluate the stability and changes of ultrasonic waves (many ultrasonic cleaning devices have issues in this regard). 2) Through the analysis of impulse response characteristics and autocorrelation, we will conduct examinations and evaluations related to tanks, transducers, and tooling (these are the most important parameters in ultrasonic processing). 3) By analyzing power contribution rates, we will examine and evaluate the optimization of ultrasonic (frequency and output), tanks, and liquid circulation (this examination is crucial for mass production devices). 4) Through nonlinear (bispectral) analysis of other factors (propagation of surface elastic waves), we will conduct examinations and evaluations tailored to the target object for cleaning, stirring, dispersion, and modification (this is necessary for research and development of ultrasonic utilization methods, including applications in nanotechnology). This analysis method is realized by adapting the measurement data to the dynamic characteristics of complex ultrasonic vibrations.

Technology for stably utilizing fine bubbles with a spherical size of 20μm or less—nano-level cleaning method that controls acoustic flow of ultrasound— 1-1. Basics of Ultrasound 1-2. Propagation Phenomena of Ultrasonic Vibration 1-3. Fine Bubbles (Microbubbles) *Properties of Microbubbles* 1) Bubbles of about 10μm rise slowly over approximately 3 hours to a height of 1m. 2) The generated bubbles exist independently without coalescing, resulting in excellent dispersion. 3) They have the property of slowly rising in water and adsorbing tiny debris to bring it to the surface. ... 13) The negative potential depends on the pH of the water. 14) Microbubbles have excellent scattering characteristics for ultrasound. 15) Microbubbles collapse as a resonance phenomenon when exposed to ultrasonic irradiation. These properties are expected to be further elucidated in the future, but currently contain many unknown aspects. Propagation Characteristics of Ultrasound 1) Detection of Vibration Modes (Changes in Self-Correlation) 2) Detection of Nonlinear Phenomena (Changes in Bicoherence) 3) Detection of Response Characteristics (Analysis of Impulse Response) 4) Detection of Interactions (Analysis of Power Contribution Rate)