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激光超声为无损检测提供了全新思路!

  有0人浏览   日期:2019-09-09

文章摘要: 目前,科学家们研发了一种的新技术,利用激光技术和蜡烛烟灰来产生有效的超声波,从而实现无损检测和评估。下面鲁商云的小编就给大家详细的介绍一下吧!......

许多工业建筑,包括核电站和化工厂等,都依赖于超声波仪器,这些仪器可不断监测其系统的结构完整性,而不会损坏或改变其功能。目前,科学家们研发了一种的新技术,利用激光技术和蜡烛烟灰来产生有效的超声波,从而实现无损检测和评估。下面鲁商云的小编就给大家详细的介绍一下吧!

Many industrial buildings, including nuclear power plants and chemical plants, rely on ultrasonic instruments, which can continuously monitor the structural integrity of their systems without damaging or changing their functions. At present, scientists have developed a new technology, using laser technology and candle soot to produce effective ultrasound, so as to achieve non-destructive testing and evaluation. Next, the small edition of Shangyun Lu will give you a detailed introduction!

一组研究人员目前开始使用超声波无损检测(NDT),该检测涉及了光声激光源信号的放大,而该激光源则使用了由蜡烛烟灰和聚二甲基硅氧烷组成的纳米颗粒阵列制成的激光吸收贴片。他们的研究成果发表在了Applied Physics Letters期刊上。

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A group of researchers are now using ultrasonic nondestructive testing (NDT), which involves amplification of the signal from a photoacoustic laser source using a laser absorbing patch made of nanoparticle arrays of candle ash and polydimethylsiloxane. Their research was published in the Journal Applied Physics Letters.

他们的方法是首批结合了接触和非接触超声检测元素的NDT系统之一。利用光声贴片产生这种超声波的结果,也证明了广泛的非接触式NDT应用的前景。

Their method is one of the first NDT systems that combines contact and non-contact ultrasonic detection elements. The use of photoacoustic patches to produce such ultrasonic results also proves the prospects of extensive non-contact NDT applications.

该论文的作者Taeyang Kim表示:“基于激光的无损检测方法具有几乎不随温度而变的测量优点,以及广泛的监测区域,还能轻松的改变设备的位置。这种技术为非接触式和远程产生超声表面波提供了一种非常灵活和简单的方法”

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Taeyang Kim, author of the paper, said: "Laser-based nondestructive detection has the advantage of almost no temperature-dependent measurement, as well as a wide range of monitoring areas, and can easily change the location of equipment. This technique provides a very flexible and simple method for non-contact and remote generation of surface acoustic waves.

当高功率激光撞击表面时,可以产生超声波。由脉冲产生的热量在照射区域上引起膨胀和压缩,从而产生超声波信号。产生的波长,称为兰姆波,随后穿过相关材料成为了弹性波。

Ultrasound can be generated when high power laser strikes the surface. The heat generated by the pulse causes expansion and compression in the irradiation area, thus generating ultrasonic signals. The resulting wavelength, called Lamb wave, then passes through the relevant material and becomes an elastic wave.

该研究小组使用蜡烛烟灰纳米粒子,再加上聚二甲基硅氧烷实现对激光的吸收。他们之所以使用蜡烛烟灰,是因为它很容易实现激光的高效吸收,并且可以形成产生光声转换所需的弹性膨胀,而这种膨胀则可以产生兰姆波。

The team used candle ash nanoparticles, plus polydimethylsiloxane, to absorb lasers. They use candle soot because it is easy to absorb lasers efficiently and can form the elastic expansion needed to produce photoacoustic conversion, which can produce Lamb waves.

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通过将贴片中的粒子放置在线阵列中,他们能够缩小波长的带宽,滤除不需要的波信号并提高分析精度。研究人员在接收变换器中选择使用了铝传感系统。相比没有贴片的条件下,贴片的使用使振幅增加了两倍以上,并证实能比其他条件产生的带宽更窄。

By placing the particles in the patch in the line array, they can reduce the bandwidth of the wavelength, filter out unwanted wave signals and improve the analysis accuracy. The researchers chose to use an aluminium sensing system in the receiver converter. Compared with the condition without patch, the use of patch can increase the amplitude more than twice, and prove that the bandwidth generated by other conditions is narrower.

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This article is compiled by Lu Shangyun, a small editor of an entrepreneur's own business cloud publishing platform. If you want to know more products and more detailed wonderful content, please pay attention to our official website: http://www.lushangyun.com. We thank you very much for your support!


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