研究的目的在於利用超音波在液體介質中以疏密波傳遞之特性，利用聲學參數中的頻率及聲強不同所形成之聲輻射力 (Acoustic Radiation Force)，對液體中的雜質微粒凝聚影響加以探討，以期能有效的將超音波的凝聚效應運用於醫學中藥物的傳遞、環保工程中去除污染物或物質純化的技術上。本研究利用微粒在超音波聲場中的運動方程式，計算出微粒在聲場中所受到聲輻射力的作用情形，以適當的激振頻率經由超音波探頭入射至液體中，觀察液體內的微粒受聲輻射力及其他作用力影響下粒子凝聚的情形。在聲場強度的選取上，則以低於理論所計算出發生空蝕現象之強度為依據。實驗結果發現，當照射頻率為1 MHz 時，可達到較對照組多27% 的增進效果，並證實在不同頻率作用下，微粒聚集的情況並不相同。

The objective of this research is to study the effect of radiation force on particles coagulation by the ultrasound exposure. The acoustic parameters, such as ultrasonic frequencies and intensities, were used to study the effects of particle collection. It is possible that the technology can be applied to the medical engineering or the environment engineering, to increase the effects of the drug delivery or pollution elimination.To study the above-mentioned problem, the suitable particles are used to research the effect of radiation force by ultrasound exposure. The oscillation of the particle in response to the ultrasound radiation is adapted from known theoretical analysis. The displacement of particles varies according to the effective charges, radii, and stiffness of the particles, and the particles of different radii can thus be controlled even when they consist of the same material. The images obtained from microscopy can be made and recorded by a personal computer. To analyze the distribution of powder particles, the direct microscope count is used. The knowledge obtained from this research can also develop the biotechnology and agriculture by using the ultrasound technique.