基于激光散斑数字图像相关法的热应变测量

王俊松; 张吴记; 潘志伟; 章美娟; 汪卫华; 杨锦宏; 黄生洪; 贺胜男

doi:doi:10.7510/jgjs.issn.1001-3806.2023.02.003

激光技术, 2023, 47 (2): 171, 网络出版: 2023-04-12

基于激光散斑数字图像相关法的热应变测量

Thermal strain measurement based on laser speckle digital image correlation method

论文大纲

王俊松 ¹张吴记 ¹潘志伟 ²章美娟 ¹汪卫华 ¹杨锦宏 ¹黄生洪 ²贺胜男 ¹

作者单位

¹ 安徽大学物质科学与信息技术研究院, 合肥 230601

² 中国科学技术大学近代力学系, 合肥 230027

摘要

为了解决常规数字图像相关法应用于高温工况下热应变测量时, 人工制作的散斑受高热载荷冲击容易出现变色、熔化、脱落的问题, 采用激光散斑作为数字图像相关法特征纹理的方法, 计算温度变化前后散斑图像相关性来测量金属热应变, 进行了非真空环境下加热试件的实验, 以及在管式加热炉中分别对铝试件和钨试件进行人工散斑和激光散斑的真空加热实验对比, 取得了相应的散斑图像, 并计算出平均应变曲线数据。结果表明, 在非真空环境下, 由于热流扰动导致激光散斑图像抖动较大, 测量出的热应变曲线存在较大的干扰噪声; 铝从室温升至450 ℃和钨从室温升至800 ℃的热应变与人工散斑结果相对一致; 激光散斑数字图像相关法在类似聚变堆偏滤器高真空、高热流条件下, 可以有效地测出金属壁面的动态热应变。该研究为聚变堆偏滤器第一壁材料的损伤诊断提供了新思路。

Abstract

In order to solve the problem of discoloration, melting and falling off of artificial speckles when the conventional digital image correlation method is applied to thermal strain measurement under high temperature conditions, the laser speckle was used as the characteristic texture method of the digital image correlation method. The correlation of speckle images before and after temperature change to measure metal thermal strain was calculated, experiments of heating specimens in a non-vacuum environment were carried out, the artificial speckle and laser tests on aluminum and tungsten specimens in a tubular heating furnace respectively vacuum heating experimental comparison of speckle were conducted.The corresponding speckle images were obtained and the mean strain curve data were calculated. The results show that in the non-vacuum environment, the laser speckle image jitters greatly due to the disturbance of heat flow, and the measured thermal strain curve has large interference noise. The thermal strain of aluminum with the temperature increases from room temperature to 450 ℃ and the thermal strain of tungsten with the temperature increases from room temperature to 800 ℃ is respectively consistent with the artificial speckle results. This study shows that the laser speckle digital image correlation method can effectively measure the dynamic thermal strain of the metal wall under the conditions of high vacuum and high heat flow similar to the fusion reactor divertor, which provides a new idea for the damage diagnosis of the first wall material of the fusion reactor divertor.

参考文献

[1] PAN B, LI K, TONG W. Fast, robust and accurate digital image co-rrelation calculation without redundant computations[J]. Experimental Mechanics, 2013, 53(7):1277-1289.

[2] GAO Y, CHENG T, SU Y, et al. High-efficiency and high-accuracy digital image correlation for three-dimensional measurement[J]. Optics and Lasers in Engineering, 2015, 65:73-80.

[3] LIU Y, XIAO Sh D, ZHANG R, et al. Initial estimation of digital i-mage correlated deformation based on genetic algorithms[J]. Laser Technology, 2020, 44(1): 130-135 (in Chinese).

[4] LIU Y, ZHAO W, LI Q T, et al. Experimental study on the modal characteristics identification for the clip based on the digital image co-rrelation [J]. Journal of Experimental Mechanics, 2021, 36(6):804-816 (in Chinese).

[5] PAN Zh W, HUANG S H, JIANG M L. In-situ measurements of deformation to fatigue failure on a flat-type divertor mockup under high heat flux loads by 3D digital image correlation[J]. Nuclear Fusion, 2020, 61(2):026012.

[6] TIAN W Y, DU W, ZUO H, et al. Experimental measurement method of low temperature crack tip opening displacement of metallic materials based on digital image correlation [J]. Journal of Experimental Mechanics, 2020, 35(6):1014-1022 (in Chinese).

[7] PAN Zh W, HUANG S H, SU Y, et al. Strain field measurements over 3000 ℃ using 3D-digital image correlation[J]. Optics and Lasers in Engineering, 2020, 127:105942.

[8] CHEN Ch, GUO X M, MA J, et al. Measurement of surface roughness based on laser angular-speckle correlation method[J]. Laser Technology, 2015, 39(4): 497-500 (in Chinese).

[9] WU N, HARUYAMA S. Real-timeaudio detection and regeneration of moving sound source based on optical flow algorithm of laser speckle images[J]. Optics Express, 2020, 28(4):4475-4488.

[10] PANG Y, LINGAMANAIK S N, CHEN B K, et al. Measurement of deformation of the concrete sleepers under different support conditions using non-contact laser speckle imagingsensor[J]. Engineering Structures, 2020, 205(12):110054.

[11] LIANG M L. Study on themeasurement of average velocity of nanofluids by laser speckle image analysis[D]. Kunming: Kunming University of Science and Technology, 2019:43-79 (in Chinese).

[12] MEYER P, WAAS A M. Measurement ofin situ-full-field strain maps on ceramic matrix composites at elevated temperature using di-gital image correlation[J]. Experimental Mechanics, 2015, 55(5):795-802.

[13] SONG J L, YANG J H, LIU F J, et al. High temperature strain measurement method by combining digital image correlation of laser speckle and improved RANSAC smoothing algorithm[J]. Optics and Lasers in Engineering, 2018, 111:8-18.

[14] SONG J L, YANG J H, LIU F J, et al. Ultra-high temperature mechanical property test of C/C composites by a digital image correlation method based on an active laser illumination and background radiation suppressing method with multi-step filtering[J]. Applied Optics, 2019, 58(24):6569-6580.

[15] ZHENG Q, MASHIWA N, FURUSHIMAT. Evaluation of large plastic deformation for metals by a non-contacting technique using digital image correlation with laser speckles[J]. Materials & Design, 2020, 191:108626.

[16] SONG J L, YANG J H, LIU F J, et al. Quality assessment of laser speckle patterns for digital image correlation by a multi-factor fusionIndex[J]. Optics and Lasers in Engineering, 2020, 124:105822.

[17] ZENG Y. Study onapplication of laser speckle measurement[D]. Chongqing: Chongqing University, 2005:5-6 (in Chinese).

[18] HU H F. Surfaceroughness measurement based on laser spackle i-mage [D]. Nanjing: Nanjing University of Information Science and Technology, 2015:12-13 (in Chinese).

[19] YAMAGUCHI I. Alaser-speckle strain gauge[J]. Journal of Phy-sics, 2000, E14(11):1270-1273.

[20] PETERS W H. Digital image techniques in experimental stressanalysis[J]. Optical Engineering, 1982, 21(3):427-431.

[21] SONG J L. Research on ultra-high temperature deformation measurement method based on digital image correlation with laser speckle[D]. Beijing:University of Science and Technology Beijing, 2020:10-12(in Chinese).

王俊松, 张吴记, 潘志伟, 章美娟, 汪卫华, 杨锦宏, 黄生洪, 贺胜男. 基于激光散斑数字图像相关法的热应变测量[J]. 激光技术, 2023, 47(2): 171. WANG Junsong, ZHANG Wuji, PAN Zhiwei, ZHANG Meijuan, WANG Weihua, YANG Jinhong, HUANG Shenghong, HE Shengnan. Thermal strain measurement based on laser speckle digital image correlation method[J]. Laser Technology, 2023, 47(2): 171.

基于激光散斑数字图像相关法的热应变测量

关于本站 Cookie 的使用提示

全站搜索

基于激光散斑数字图像相关法的热应变测量

相关论文

相关资讯

关于本站 Cookie 的使用提示

全站搜索