首页> 外文OA文献 >Development of a spherically focused capacitive-film air-coupled ultrasonic transducer and a leak location array sensor for long-endurance spacecraft
【2h】

Development of a spherically focused capacitive-film air-coupled ultrasonic transducer and a leak location array sensor for long-endurance spacecraft

机译:球形聚焦电容膜空气耦合超声换能器和用于长寿命航天器的泄漏位置阵列传感器的开发

代理获取
本网站仅为用户提供外文OA文献查询和代理获取服务,本网站没有原文。下单后我们将采用程序或人工为您竭诚获取高质量的原文,但由于OA文献来源多样且变更频繁,仍可能出现获取不到、文献不完整或与标题不符等情况,如果获取不到我们将提供退款服务。请知悉。

摘要

This research work is focused on the development of a spherically focused (no-mirror) capacitive-film air-coupled ultrasonic transducer and a leak location array sensor for long-endurance spacecraft. For the development of a spherically focused capacitive-film air-coupled ultrasonic transducer, two transducers have been designed, fabricated, and their performance characterized, using a spherically deformed backplate and film. One has a 10-mm diameter and 25.4-mm geometric focal length, and another has a 50-mm diameter and 50.8-mm geometric focal length. Both spherically focused transducers have frequency spectra centered at 805 kHz with -6-dB points at 400 kHz and 1200 kHz. By performing rigorous feasibility tests; a flexible copper/polyimide circuit board material is employed as a backplate in place of the conventional silicon substrate. Utilizing its deformability and ease of microfabrication, we have demonstrated that spherically focused air-coupled ultrasonic transducers can be made to function without the need of an external focusing device, such as a zone plate or an acoustic mirror. We have also invented a simple and easily applied method to conform the metalized polymer film onto a spherically curved backplate, while suppressing wrinkling on the film. Good agreement has been shown between measurement and theory, suggesting that our transducers behave as ideal spherically focused piston transducers;For the development of a leak location array sensor for long-endurance spacecraft, we have developed and experimentally demonstrated a sensitive and reliable means to locate an air leak in a plate-like structure. The goals of this work are accomplished by developing a sophisticated leak location algorithm and a two-dimensional PZT array sensor. The proposed leak location algorithm is highly effective in finding the direction of the leaks, using a minimal number of sensors, and needing less computation time while still achieving high accuracy. In addition, it accounts for the multi-mode dispersive characteristics in a plate-like structure, and utilizes structure-borne noise generated by turbulence at an air leak. This leak location algorithm is implemented by a prototype of a 64-element array sensor.
机译:这项研究工作的重点是开发用于长寿命航天器的球形聚焦(无镜)电容膜空气耦合超声换能器和泄漏位置阵列传感器。为了开发球形聚焦电容薄膜空气耦合超声换能器,已经设计,制造了两个换能器,并使用了球形变形的背板和薄膜来表征其性能。一种具有10毫米直径和25.4毫米几何焦距,另一种具有50毫米直径和50.8毫米几何焦距。两个球形聚焦换能器的频谱都集中在805 kHz处,在400 kHz和1200 kHz处有-6 dB点。通过进行严格的可行性测试;柔性铜/聚酰亚胺电路板材料被用作背板,代替了常规的硅基板。利用其可变形性和易于微制造,我们证明了球形聚焦的空气耦合超声换能器无需外部聚焦装置(如波带片或声镜)即可工作。我们还发明了一种简单易用的方法,可将金属化的聚合物薄膜贴合到球形弯曲的背板上,同时抑制薄膜上的褶皱。测量与理论之间已显示出良好的一致性,这表明我们的换能器表现为理想的球形聚焦活塞换能器;对于开发用于长寿命航天器的泄漏定位阵列传感器,我们已经开发并通过实验证明了一种灵敏而可靠的定位方法板状结构中的漏气。通过开发复杂的泄漏定位算法和二维PZT阵列传感器,可以实现这项工作的目标。所提出的泄漏定位算法在使用最少数量的传感器来发现泄漏方向方面非常有效,并且在仍能实现高精度的同时需要更少的计算时间。另外,它考虑了板状结构中的多模色散特性,并利用了由于漏气时的湍流产生的结构噪声。此泄漏定位算法是由64元素阵列传感器的原型实现的。

著录项

  • 作者

    Song, Jun-Ho;

  • 作者单位
  • 年度 2005
  • 总页数
  • 原文格式 PDF
  • 正文语种 en
  • 中图分类

相似文献

  • 外文文献
  • 中文文献
  • 专利
代理获取

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号