A STUDY OF SPECTROSCOPY OF SMALL PARTICLES USING ULTRASONIC MICROMANIPULATORS

本文研究了利用视觉反馈技术，基于甚高频（VHF）辐射力对液体中微米级颗粒进行超声微操作的技术。研究了本研究中单独选择性评价液体中微米级颗粒弹性性能的新型超声光谱技术实现的可能性，得到了以下结果和展望：1)。为了产生声压分布有波谷的高功率密度超声波束，研制了利用多带耦合器的漏波换能器(2)。利用视觉反馈和漏波换能器构建了机械手，并对微米级球体进行了平移和捕获。从实验中明确了该机械手中微米级球体的运动呈现出反映弹性特性的特征运动，并为该机械手在微米级颗粒光谱学中的应用开辟了新的可能性。提出了一种超声波与激光束互补结合的新型激光超声微机械臂（LUMM）。成功地进行了从大量粒子中去除多余粒子而只捕获特定粒子的实验。部分研究结果发表在《日本电气工程师学会》、《电子学学会》、《中华人民大学学报》上。和Commun。工程，和IEEE超声研讨会。未发表的结果将在不久的将来公布。

In this paper, ultrasonic micromanipulation (UMM) techniques for micron-sized particles in liquid based on the radiation forces of very-high-frequency (VHF) using visual feedback techniques were studied. The possibility of a realization of the new ultrasonic spectroscopy technology in which this study individually selectively evaluates elastic property of the micron-sized particles in liquid was investigated, and the following results and prospects were obtained.1). The Leaky wave transducer using the multistrip coupler was developed to generate the high power density ultrasonic wave beam with the trough in the sound pressure distribution.2). Manipulator using visual feedback and leaky wave transducers was constructed and translation and trapping of the micron-sized sphere were carried out.3). It was clarified of the manipulator in which that the motion of the micron-sized sphere shows the characteristic motion which reflects the elastic property from the experiment, and the new application possibility of this manipulator to the spectroscopy of micron-sized particle was found.4). The new laser ultrasonic micromanipulator (LUMM) in which the ultrasonic wave and laser beam combined complementarily was proposed. The experiment of trapping only the specific particle by the removal of unnecessary particles from large number of particles was carried out successfully.Parts of these results are presented in Inst. of Electrical Engineers of Japan, Inst. of Electronics, lnf. and Commun. Engineering, and IEEE Ultrasonics Symposium. The unpublished results will be presented in near future.