光学精密工程2025，Vol.33Issue(15)：2365-2377,13.DOI:10.37188/OPE.20253315.2365
HRB400钢筋金纳米复合材料光声传感微裂纹检测
Crack detection of HRB400 steel reinforcement bar using AuNPs-based nanocomposites photoacoustic sensing
摘要
Abstract
To overcome the limited electromagnetic-interference resilience and poor adaptability of conven-tional approaches,an ultrasonic detection method based on AuNPs-reinforced nanocomposite photoacous-tic sensing was developed for high-precision microcrack detection in HRB400 steel reinforcement bars used in high-speed rail sleepers.Au-PDMS films with Au nanoparticle concentrations of 4.01 wt%,5.23 wt%,6.01 wt%,and 7.69 wt%were fabricated,and their photoacoustic conversion characteristics were characterized.Ultrasonic signals were generated by a 532 nm pulsed laser and processed using a hybrid al-gorithm combining Butterworth bandpass filtering and db4 wavelet decomposition.A finite-element model of HRB400 reinforcement was constructed in COMSOL Multiphysics to quantify the relationship between multidimensional ultrasonic features and crack depth.Experimental results indicate that the 5.23 wt%Au-PDMS sample exhibited a dominant frequency of 4.58 MHz and a signal-to-noise ratio of 19.56 dB,achieving a measured crack-depth detection resolution of 640 μm.Quantitative analysis showed an in-crease in first-wave amplitude for 1 mm deep cracks,whereas 3 mm deep cracks produced waveform split-ting into a dual-peak structure with a peak interval of 1.50 μs.A multiparameter synergistic response mod-el integrating peak amplitude,energy,dominant frequency,and time-of-arrival enabled quantitative micro-crack assessment.The proposed system provides micron-level resolution,strong immunity to electromag-netic interference,and adaptability to complex environments,offering reliable technical support for struc-tural health monitoring of high-speed rail infrastructure.关键词
光声传感/超声检测/HRB400钢筋/多物理场仿真/微裂纹生长Key words
photoacoustic sensing/ultrasonic detection/HRB400 steel reinforcement bar/multiphysics field simulation/microcrack growth分类
通用工业技术引用本文复制引用
孙雨梦,孙子惠,杜聪,陈志刚,孙殷楠..HRB400钢筋金纳米复合材料光声传感微裂纹检测[J].光学精密工程,2025,33(15):2365-2377,13.基金项目
国家自然科学基金资助项目(No.62205012) （No.62205012）
