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Design for Underwater Aplanatic Acoustic Mirror

机译：水下非平面声镜的设计

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摘要

Underwater acoustic lenses are useful devices for underwater imaging because of their small dimension and low power consumption but have a problem under the condition of changing water temperature because the refractive index depends on the water temperature. To solve this problem, we propose aplanatic acoustic mirrors, which consist of two aspherical mirrors and can remove spherical and coma aberrations. These mirrors are designed by a method used in the Ritchey Chretien astronomical telescopes. The aplanatic mirror shows a larger focal sound pressure and better temperature characteristic than an aplanatic acoustic lens but has a narrow field of angle. Then, an off-axis aplanatic mirror, which consists of two aspherical off-axis mirrors, is designed by extraction of parts from a normal aplanatic mirror to obtain a wider field of angle.
机译：水下声透镜由于其尺寸小且功耗低而成为水下成像的有用设备，但是由于折射率取决于水温，因此在水温变化的情况下存在问题。为了解决这个问题，我们提出了非平面声镜，它由两个非球面镜组成，可以消除球面和彗形像差。这些反射镜是通过Ritchey Chretien天文望远镜中使用的方法设计的。与非平面声透镜相比，非平面镜显示出更大的聚焦声压和更好的温度特性，但是具有狭窄的角度场。然后，通过从正常的非球面镜中提取零件来设计更广的角度范围，从而设计出由两个非球面离轴镜组成的离轴非球面镜。

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  • 来源
    《Japanese journal of applied physics》 |2010年第7issue2期|P.07HG03.1-07HG03.7|共7页
  • 作者

    Yuji Sato; rnKoichi Mizutani; rnNaoto Wakatsuki; rnToshiaki Nakamura;

  • 作者单位

    Graduate School of Systems and Information Engineering, University of Tsukuba, Tsukuba, Ibaraki 305-8573, Japan;

    rnGraduate School of Systems and Information Engineering, University of Tsukuba, Tsukuba, Ibaraki 305-8573, Japan;

    rnGraduate School of Systems and Information Engineering, University of Tsukuba, Tsukuba, Ibaraki 305-8573, Japan;

    rnDepartment of Earth and Ocean Sciences, National Defense Academy, Yokosuka, Kanagawa 239-8686, Japan;

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