A STUDY OF SPECTROSCOPY OF SMALL PARTICLES USING ULTRASONIC MICROMANIPULATORS

研究了基于视觉反馈的超高频辐射力作用下液体中微米级颗粒的超声微操纵技术。本研究探讨了实现单独选择性评价液体中微米级颗粒弹性性质的超声光谱新技术的可能性，并得到了以下结果和展望。1）.研制了多条耦合漏波换能器，用于产生声压分布呈波谷的高功率密度超声波束。构建了基于视觉反馈和漏波传感器的机械手，实现了微球的平移和捕获。从实验上阐明了微球在机械臂中的运动呈现出反映弹性性质的特征运动，并发现了该机械臂在微粒子光谱学中新的应用可能性.提出了一种超声波与激光互补作用的激光超声显微操作器。成功地进行了从大量粒子中除去不需要的粒子而只捕集特定粒子的实验，部分结果发表在日本电机工学院、电子学研究所、lnf.的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 The unpublished results will be presented in near future.