Development of NDE Apparatus for Dry/Wet Surface Defects with Photo acoustic and Photo thermal effects.

开发具有光声和光热效应的干/湿表面缺陷无损检测设备。

• 批准号: 10650059
• 负责人: HOSHIMIYA Tsutomu
• 金额: $ 1.47万
• 依托单位: Tohoku Gakuin University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10650059/
• 关键词: Photoacoustic microscope(PAM); nondestructive test(NDT); imaging; surface defect; electrochemical; photothermal effect; 映像法; 光音響; 孔食

In this research project, we paid an attention to the fact that a photothermal electrochemical (PE) detection is based on the accumulation and modulation of a electrochemical reaction by the laser beam so that the improvement of the reproducibility was most considered. In the academic year 1998, three-terminal (3T) method was adopted instead of two-terminal (2T) method. In the 3T scheme, a reference electrode was added between cathode and anode in order to stabilize a potential between cathode and anode. As a result, 3T method improves the reproducibility of the PE signal. Furthermore, it was verified that the chemical etching of the pitting corrosion hole was accumulated so that it generated a PE signal. On the other hand, however, the rest metal specimen was almost kept without pitting by chemical reaction, if the voltage applied to the reference electrode was adjusted slightly below the corrosion potential of the metal specimen. The same surface defect was measured by PA method for … More comparison. The result showed that the PE method was comparable to PA method in spatial resolution. Group of investigator Hiwatashi tried to made actual pitting corrosions and measured them with PAM.. Group of investigator Endoh measured actual cracks occurred in a metal plate with PAM..Their works made advance in NDE with PAM as actual applications.In the academic year 1999, remarkable development of PAM was by the practical use of fine slide stages controlled by the software Lab VIEW. The above research results were presented at the domestic and international conferences (SPIE, Yokohama/IEEE, Nevada).As described above, in this research project, a new PE method, which was proposed by the head investigator, was shown to be a new tool, which is capable to measure corrosions or tiny pitting holes occurred in small distributing pipes in an electrolyte liquid environment, in which a conventional gas-microphone PA method was unable to be applied. Furthermore, driving system of PAM was also done so that applications of the PAM to actual NDE was realized. Less

在本研究项目中，我们注意到光热电化学（PE）检测是基于激光束对电化学反应的积累和调制的事实，因此最考虑的是再现性的提高。在1998学年，采用了三端（3 T）法，而不是两端（2 T）法。在3 T方案中，在阴极和阳极之间添加参比电极以稳定阴极和阳极之间的电势。结果，3 T方法提高了PE信号的再现性。此外，还证实了点蚀孔的化学蚀刻累积，从而产生PE信号。另一方面，然而，如果将施加到参比电极的电压调节为略低于金属试样的腐蚀电位，则其余金属试样几乎保持没有通过化学反应产生点蚀。用PA法测量相同的表面缺陷， ...更多信息 对比结果表明，PE法与PA法在空间分辨率上相当。Hiwatashi的研究小组试图制作实际的点蚀，并用PAM测量它们。研究小组Endoh测量了PAM金属板中发生的实际裂纹。在1999学年，PAM的显着发展是由软件LabVIEW控制的精细滑动台的实际使用。上述研究成果在国内和国际会议上发表（SPIE，Yokohama/IEEE，内华达州）。如上所述，在该研究项目中，由首席研究员提出的新PE方法被证明是一种新的工具，其能够测量电解液环境中的小分配管中发生的腐蚀或微小点蚀孔，其中不能应用常规气体麦克风PA方法。此外，还设计了PAM的驱动系统，实现了PAM在实际无损检测中的应用。少

项目成果

Y. Hiwatashi, H. Endoh and T. Hoshimiya: "Observation of several types of pitting corrosions by photoacoustic microscopy"Jpn. J. Appl. Phys.. vol.37 no..58 part1. 3136-3139 (1998)

Y. Hiwatashi、H. Endoh 和 T. Hoshimiya：“通过光声显微镜观察几种类型的点蚀”Jpn。

Haruo Endoh, N.Yaegashi, Y.Hiwatashi and T.Hoshimiya: "Nondestructive Evaluation of a Surface-subsurface Complex Defect by the Use of Photoacoustic Microscope"ibid., (Tokyo). (in Jaanese). 101-102 (1999)

Haruo Endoh、N.Yeegashi、Y.Hiwatashi 和 T.Hoshimiya：“使用光声显微镜对表面-次表面复杂缺陷进行无损评估”同上，（东京）。

H.Endoh,Y.Hiwatashi and T.Hoshimiya: "Nondestructive evaluation of Simulated and actual surface defects using photo acoustic microscope"同上. vol3740. 650-653 (1999)

H.Endoh、Y.Hiwatashi 和 T.Hoshimiya：“使用光声显微镜对模拟和实际表面缺陷进行无损评估”，第 3740 卷（1999 年）。

Y.Hiwatashi,H.Endoh and T.Hoshimiya: "Observation of actual pitting corrosions by photoacoustic imaging"同上. vol3740. 574-576 (1999)

Y. Hiwatashi、H. Endoh 和 T. Hoshimiya：“通过光声成像观察实际点蚀”，第 3740 卷（1999 年）。

T.Hoshimiya: "Nondestructire evaluation of surface degects under dry/wet environment by the use of photoacoustic and photothermal electrochemical imaging" NDT&E International.(in press). (1999)

T.Hoshimiya：“利用光声和光热电化学成像对干/湿环境下的表面缺陷进行无损评估”NDT