• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Optical engineering >Beam shaping using liquid crystal-on-silicon spatial light modulators for laser ultrasound generation
【24h】

Beam shaping using liquid crystal-on-silicon spatial light modulators for laser ultrasound generation

机译：使用硅基液晶空间光调制器进行光束整形以产生激光超声

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The application of laser ultrasound for nondestructive testing of carbon fiber-reinforced plastics (CFRP) and carbon fiber-reinforced thermoplastics (CFRTP) is shown. Laser-generated excitation creates a three-dimensional, thermoelastic zone which emits ultrasound waves during expansion and contraction. In order not to exceed the damage threshold of the material to be tested usually only a low-energy density and therefore a weak excitation of ultrasound waves can be achieved. For instance, the use of a YAG laser type with a wavelength around 1 μm leads to a very low absorption in the matrix of CFRP while the absorption in the fibers is very high. As a consequence the excitation is often destructive. To solve this problem, we describe the successful introduction of a spatial light modulator to laser ultrasound allowing for tailored spatial energy distributions for efficient nondestructive excitation of ultrasound waves within CFRP or CFRTP.
机译：显示了激光超声在碳纤维增强塑料（CFRP）和碳纤维增强热塑性塑料（CFRTP）的无损检测中的应用。激光产生的激励产生一个三维热弹性区，该区在膨胀和收缩期间会发出超声波。为了不超过待测材料的损伤阈值，通常仅可以实现低能量密度，因此可以实现对超声波的弱激发。例如，使用波长约为1μm的YAG激光器会导致CFRP基质中的吸收非常低，而纤维中的吸收却非常高。结果，激发常常是破坏性的。为了解决这个问题，我们描述了将空间光调制器成功引入激光超声中，从而允许针对CFRP或CFRTP内的超声波进行有效的非破坏性激发的定制空间能量分布。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

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