Development of combined acoustic and optical lens of planar-structure and its application to new microscope system for simultaneous acoustic and optical imaging.

平面结构声光组合透镜的研制及其在声光同时成像新型显微镜系统中的应用。

• 批准号: 62850063
• 负责人: SHIMIZU Hiroshi
• 金额: $ 4.54万
• 依托单位: TOHOKU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Developmental Scientific Research
• 财政年份: 1987
• 资助国家: 日本
• 起止时间: 1987 至 1988
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-62850063/
• 关键词: Acoustic Microscope; Acoustic Lens; Selfoc Lens; Fresnel-Zone Plate; Planar-Structure; Simultaneous Observation; Acoustic Image; 光学像

The scanning acoustic microscops (SAM) has been applied successfully for visualizing the microstructure of various materials and/or characterizing the elastic properties of solids and viological tissues. In order to inspect a specimen in detail from various viewpoints, it is often desirable that an acoustic image taken by a SAM should be compared simultaneously with its optical counterpart of the same field of view. For this purpose, a new type of combined acoustic and optical microscope-lens of planar structure is developed in this research project. The lens is composed by uniting a Fresnel-zone-type acoustic lens proposed by the authors with a rod-type gradient-index optical lens (SELFOC). A piezoelectric thin-film transducer having a pin-hole at its center is deposited on one end of the rod, and a number of annular grooves are formed on the other end of the rod. An optical beam from a He-Ne laser source is guided into the lens through the pin-hole and converges due to the gradient of the refractive index. After passing through the central ungrooved zone of the acoustic Fresnel lens, the optical beam focuses on a spot in water outside tho rod. By designing the lenght of the rod properly, the focal spot of the optical beam is set to coincide with that of the acoustic beam. The lens is applied to a new combined scanning acoustic and optical microscope system which is composed by adding some optical components to a conventional SAM. Usefulness of the newly-developed microscope system is demonstrated through experiments for simultaneous observation of acoustic and optical images of the same portion of various specimens.

扫描声学显微镜 (SAM) 已成功应用于可视化各种材料的微观结构和/或表征固体和生物组织的弹性特性。为了从不同的角度详细检查样本，通常需要将 SAM 拍摄的声学图像与其相同视场的光学图像同时进行比较。为此，本研究项目开发了一种新型平面结构声光组合显微镜镜头。该透镜由作者提出的菲涅尔区型声透镜与杆型梯度折射率光学透镜（SELFOC）结合而成。杆的一端沉积有中心具有针孔的压电薄膜换能器，杆的另一端形成有多个环形凹槽。来自氦氖激光源的光束通过针孔被引导到透镜中，并由于折射率的梯度而会聚。穿过声菲涅尔透镜的中心无槽区域后，光束聚焦在杆外水中的一个点上。通过适当设计杆的长度，光束的焦点被设置为与声束的焦点一致。该镜头应用于新型扫描声光组合显微镜系统，该系统是在传统SAM的基础上增加一些光学元件而组成的。通过同时观察不同标本同一部分的声学和光学图像的实验证明了新开发的显微镜系统的实用性。

项目成果

杉山敏樹、山田顕、清水洋: 東北大学電気通信研究所音響工学研究会. 1-16 (1988)

Toshiki Sugiyama、Akira Yamada、Hiroshi Shimizu：东北大学电气通信研究所声学工程研究小组 1-16 (1988)。

Ken Yamada;Toshiki Sugiyama;Hiroshi Shimizu: Proceedings of 1988 IEEE Ultrasonics Symposium. (1988)

Ken Yamada；Toshiki Sugiyama；Hiroshi Shimizu：1988 年 IEEE 超声波研讨会论文集。

山田顕、杉山敏樹、清水洋: 日本音響学会講演論文集. 775-776 (1988)

Ken Yamada、Toshiki Sugiyama、Hiroshi Shimizu：日本声学学会论文集 775-776 (1988)。

山田顕、清水洋: 電気学会第17回EMシンポジウム. 31-36 (1988)

Ken Yamada、Hiroshi Shimizu：日本电气工程师学会第 17 届电磁研讨会 31-36 (1988)。

Ken,Yamada; Toshiki,Sugiyama; Hiroshi,Shimizu: "Theoretical Considerations on Acoustic Field Formed by Fresnel-Zone-Type Focusing Radiator" Spring Meeting of Acoustical Society of Japan. 695-696 (1987)

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