Infrared and Laser Engineering, Volume. 52, Issue 4, 20220443(2023)
Adaptive sparse algorithm for terahertz time domain signals based on gradient threshold
Figures & Tables(15)
Fig. 1. Propagation process of THz signal in multilayer bonded structure sample
Fig. 5. (a) Normal multilayer bonding structure sample and THz-TDS detection signal; (b) Debonding defect test sample and THz-TDS detection signal
Fig. 8. (a) Amplitude error of recovered signal A; (b) Amplitude error of recovered signal B
Fig. 9. Compression performance comparison of signal compression algorithms
Fig. 10. THz images of the original signal. (a) Upper flight time image; (b) Lower flight time image; (c) Upper peak-to-peak image; (d) Lower peak-to-veally image
Fig. 11. THz images of sparse recovery signal. (a) Upper flight time image; (b) Lower flight time image; (c) Upper peak-to-peak image; (d) Lower peak-to-veally image
Table 1. Time position corresponding to characteristic peak-to-peak values of signal A and signal B
View tableView in ArticleTable 1. Time position corresponding to characteristic peak-to-peak values of signal A and signal B
THz signal ${T_{{\rm{up1}}} }$ ${T_{{\rm{up2}}} }$ ${T_{{\rm{low1}}} }$ ${T_{{\rm{low2}}} }$ Signal A 57.2 67.9 78.7 89.6 Signal B 57.6 67.4 78.2 87.8
Table 2. Sparse threshold of signal A and signal B
View tableView in ArticleTable 2. Sparse threshold of signal A and signal B
THz signal $\tau $ $\eta $ Original data number Sparse data number Signal A 0.42 0.07 1 600 224 Signal B 0.33 0.09 1 600 216
Table 3. Area ratio of defect regions in upper and lower THz signal images
View tableView in ArticleTable 3. Area ratio of defect regions in upper and lower THz signal images
Defect region 1 Defect region 2 Defect region 3 Defect region 4 Upper 1.01 1.00 0.96 1.05 Lower 1.03 1.00 0.99 1.00
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Lili Qin, Lijuan Li, Jiaojiao Ren, Jian Gu, Weihua Xiong, Dandan Zhang, Lili Zhu, Jiyang Zhang, Junwen Xue, Baihong Jiang, Zenghua Gao. Adaptive sparse algorithm for terahertz time domain signals based on gradient threshold[J]. Infrared and Laser Engineering, 2023, 52(4): 20220443
Paper Information
Category: Image processing
Received: Jun. 27, 2022
Accepted: --
Published Online: Jul. 4, 2023
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