The change is experimented and confirmed in the state of propagation of the supersonic wave by the PET bottle.
The technology that effectively used this result was developed. ペットボトルによる、超音波の伝搬状態に変化について
実験・確認しています
この結果を効果的に利用する技術を開発しました
Use of ultrasound conditions varying complexity,
Do not just evaluate the frequency and sound pressure
"tone" to consider,
Autoregressive model to analyze time series data
Assessment and Application to
PC oscilloscope response time series analysis guided wave ultrasonic wave ropagation measurements