Study on Detecting Existence of Flaws in Materials by Observing Radiation Temperature distribution by means of infrared radiometry

红外辐射测量观察辐射温度分布检测材料缺陷存在的研究

• 批准号: 03650058
• 负责人: OKAMOTO Yoshizo
• 金额: $ 1.34万
• 依托单位: Ibaraki University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1991
• 资助国家: 日本
• 起止时间: 1991 至 1993
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-03650058/
• 关键词: Flaw; Detection Limit; Nondestructive Test; Infrared Way; Thermal Image Method; Normal Heating Method; Lateral Heating Method; Radiation Temperature Image; 温度分布; 高熱流束加熱試験; 赤外線映像装置; 可視化計測; 表面加熱; 熱的非破壊検査基準; リモートセンシング; モルタル; 金属; 拡大流れ; 太陽

A new thermal radiation technique using an infrared radiometer had been developed to detect internal flaws of materials used, such as inclusion, crack, gap and pinhole. In this study, several incident thermal energies like sun, lamp and hot gas, were injected to the test material with artifical internal flaws. Transient radiation temperature of the surface above the internal flaws were displayd on the CRT by means of the infrared radiometer. The radiation temperature difference between the surface and flaws represents the existance of the internal flaws. Characteristics of various heat injection methods, such as normal and lateral heatings were compared with each others by using test pieces of metal, ceramic, plastic and insulator.Stepwise high-flux heat injection test had been undertaken, using a Halogen lamp with a parabolic stainless mirror coated by gold in case of the normal heating. And the injected heat from lateral side of the test piece flows to the other side of the piece by heat conduction in case of the lateral heating. We visualized the mountainous and valley-like temperature distribution above the internal flaws at the normal heating and discontinuous temperature difference above the flaws at the lateral heating. Test results show that the lateral heating method is more superior than the normal heating in case of detecting the slit flaw and inferior than the normal heating in case of detecting the pin-hole flaw.The detection limit of internal flaws is determined by the surface tempeature variance of the tested material. The transient heat flow arround the internal flaws were numerically analyzed by solving a 2-dimensional heat conduction equation to verify the surface temperature distribution above the flaws.

已经开发出一种使用红外辐射计的新热辐射技术，用于检测所用材料的内部缺陷，例如夹杂物、裂纹、间隙和针孔。在这项研究中，几种入射热能（如太阳、灯和热气体）被注入到具有人工内部缺陷的测试材料中。内部缺陷上方表面的瞬态辐射温度通过红外辐射计显示在CRT上。表面与缺陷之间的辐射温差代表内部缺陷的存在。采用金属、陶瓷、塑料和绝缘体试件，比较了正常加热和侧向加热等各种热注入方法的特性。在正常加热情况下，使用带有镀金抛物面不锈钢镜面的卤素灯进行了逐步高通量热注入试验。横向加热时，从试件侧面注入的热量通过热传导流向试件的另一面。我们可视化了正常加热时内部缺陷上方的山区和山谷状温度分布以及横向加热时缺陷上方的不连续温差。试验结果表明，横向加热法在检测狭缝缺陷时优于普通加热，在检测针孔缺陷时比普通加热较差。内部缺陷的检出限由被测材料表面温度变化决定。通过求解二维热传导方程，对内部缺陷周围的瞬态热流进行数值分析，验证缺陷上方的表面温度分布。

项目成果

Yoshizo Okamoto et al.: "Detection Limit of Internal Flaws by Means of Normal and Horizontal Heat Flow by Infrared Illumination" Japan Soc.of Nondestructive Evaluation. 41,7. 398-405 (1992)

Yoshizo Okamoto 等人：“通过红外照明法向和水平热流检测内部缺陷的极限”日本无损评估协会。

Yoshizo Okamoto: "Applied Thermal Instrumentation by Infrared Radiometry" Light Alliance, Japan Industrial Publisher LTD.9. 19-25 (1993)

Yoshizo Okamoto：“红外辐射测量应用热仪器”光联盟，日本工业出版社 LTD.9。

岡本芳三: "赤外線応用熱計測技術の現状と課題" 日本赤外線学会定例研究会論文集. 1-8 (1994)

Yoshizo Okamoto：“红外应用热测量技术的现状和问题”日本红外学会定期研究会议记录1-8（1994）。

Yoshizo Okamoto: "Visualization of Internal Flaw and Leak of Power Components Infrared Radiometer" Proc.of Fall Conf.of The American Soc for Nondestructive Testing. 93. 67-69 (1993)

Yoshizo Okamoto：“功率元件红外辐射计内部缺陷和泄漏的可视化”Proc.of Fall Conf.of the American Soc for Nonrustesting。

Yoshizo Okamoto et al.: "Visualization of Internal flaw and Leak of Power Component by Infrared Radiometer" Proc.of Fall Conf.of American Soc.for Non-destructive Testing. 93. 67-69 (1993)

Yoshizo Okamoto 等人：“通过红外辐射计实现电源部件内部缺陷和泄漏的可视化”Proc.of Fall Conf.of American Soc.for 非破坏性测试。