Acta Optica Sinica, Volume. 42, Issue 2, 0212001(2022)
Photoacoustic Detection Method for Depth of Surface Narrow Defects
Figures & Tables(15)
Fig. 2. Ultrasonic field of surface defect at different moments. (a) 3.77 μs; (b) 3.95 μs; (c) 4.26 μs; (d) 4.51 μs
Table 1. Simulation data of narrow defects
View tableTable 1. Simulation data of narrow defects
Defect size /(mm×mm) 0.2×0.1 0.2×0.2 0.3×0.2 0.4×0.2 0.5×0.2 tRR /μs 4.71 4.71 4.71 4.71 4.71 tRS /μs 4.91 5.01 5.08 5.12 5.18 Δt /μs 0.20 0.30 0.37 0.41 0.47 Measuring depth /mm 0.1865 0.1798 0.3150 0.3924 0.5083 Error /mm -0.0135 -0.0202 0.0150 -0.0076 0.0083 Error rate /% 6.74 10.12 5.02 1.91 1.66
Table 2. Simulation data of extremely narrow defects
View tableTable 2. Simulation data of extremely narrow defects
Defect size /(mm×mm) 1×0.05 2×0.1 3×0.1 4×0.1 5×0.1 tRR /μs 4.71 4.71 4.71 4.71 4.71 tRS /μs 5.27 5.74 6.28 6.86 7.45 Δt /μs 0.56 1.03 1.57 2.15 2.74 Measuring depth 1 /mm 1.0822 1.9905 3.0341 4.1550 5.2952 Error 1 /mm 0.0822 -0.0095 0.0341 0.1550 0.2952 Error rate 1 /% 8.22 0.47 1.14 3.88 5.90 Measuring depth 2 /mm 0.9822 1.7905 2.8341 3.9550 5.0952 Error 2 /mm -0.0178 -0.2095 -0.1659 -0.0450 0.0952 Error rate 2 /% 1.78 10.47 5.53 1.12 1.90
Table 3. Simulation data of wide defects
View tableTable 3. Simulation data of wide defects
Defect size /(mm×mm) 0.1×0.2 0.1×0.25 0.2×0.25 0.2×0.3 0.2×0.5 tRR /μs 4.71 4.71 4.71 4.71 4.71 tRS /μs 4.92 4.95 5.01 5.06 5.19 Δt /μs 0.21 0.24 0.30 0.35 0.48 Measuring depth /mm 0.0058 -0.0362 0.0798 0.0764 -0.0724 Error δ /mm -0.0942 -0.1362 -0.1202 -0.1236 -0.2724 Error rate /% 94.16 136.19 60.12 61.80 136.19
Table 4. Experimental data of surface defects
View tableTable 4. Experimental data of surface defects
d /mm 0.1 0.2 0.3 0.4 0.5 tRR /μs 20.52 20.52 20.52 20.52 20.52 tRS /μs 20.73 20.82 20.88 20.94 21 Δt /μs 0.21 0.3 0.36 0.42 0.48 Measuring depth /mm 0.0058 0.1798 0.2957 0.4117 0.5276 Error δ /mm -0.0942 -0.0202 -0.0043 0.0117 0.0276 Error rate /% 94.16 10.12 1.43 2.92 5.53
Table 5. Cooper’s experimental data analysis
View tableTable 5. Cooper’s experimental data analysis
d /mm 0.1 0.15 0.2 0.25 0.5 0.75 1 tRR /μs 4.71 4.71 4.71 4.71 4.71 4.71 4.71 tRS /μs 4.86 4.88 4.9 4.93 5.08 5.23 5.32 Δt /μs 0.15 0.17 0.19 0.22 0.37 0.52 0.61 Measuring depth 1 /mm 0.2899 0.3285 0.3672 0.4252 0.7150 1.0049 1.1789 Error 1 /mm 0.1899 0.1785 0.1672 0.1752 0.2150 0.2549 0.1789 Error rate 1 /% 189.88 119.02 83.59 70.07 43.01 33.99 17.89 Measuring depth 2 /mm 0.0899 0.1285 0.1672 0.2252 0.5150 0.8049 0.9789 Error 2 /mm -0.0101 -0.0215 -0.0328 -0.0248 0.0150 0.0549 -0.0211 Error rate 2 /% 10.12 14.31 16.41 9.93 3.01 7.32 2.11
Table 6. Data analysis for Jeong’s experiment
View tableTable 6. Data analysis for Jeong’s experiment
d /mm 0.3 1 2 3 4 5 tRR /μs 4.71 4.71 4.71 4.71 4.71 4.71 tRS /μs 4.96 5.32 5.84 6.32 6.87 7.45 Δt /μs 0.25 0.61 1.13 1.61 2.16 2.74 Measuring depth 1 /mm 0.4831 1.1789 2.1838 3.1114 4.1743 5.2952 Error 1 /mm 0.1831 0.1789 0.1838 0.1114 0.1743 0.2952 Error rate 1 /% 61.05 17.89 9.19 3.71 4.36 5.90 Measuring depth 2 /mm 0.2831 0.9789 1.9838 2.9114 3.9743 5.0952 Error 2 /mm -0.0169 -0.0211 -0.0162 -0.0886 -0.0257 0.0952 Error rate 2 /% 5.62 2.11 0.81 2.95 0.64 1.90
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Haiyang Li, Binliang Zhi, Qianghua Pan, Zhiwu An, Ruien Yu. Photoacoustic Detection Method for Depth of Surface Narrow Defects[J]. Acta Optica Sinica, 2022, 42(2): 0212001
Paper Information
Category: Instrumentation, Measurement and Metrology
Received: May. 28, 2021
Accepted: Jul. 19, 2021
Published Online: Dec. 29, 2021
The Author Email: Yu Ruien (yuruien@nuc.edu.cn)
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