Spectroscopy and Spectral Analysis, Volume. 40, Issue 10, 3066(2020)
Terahertz Thickness Measurement Based on Stochastic Optimization Algorithm
Figures & Tables(9)
Fig. 1. Principle of thickness determination by THz-TDS
(a): Model of coatings; (b): Times of flight of THz echoes
Fig. 2. The measurement and simulation results of single coating samples
(a): Black coating sample; (b): Base coating sample
Fig. 4. Reflection and simulation signals of the base and silver coating sample
Table 1. Results of single coating samples by SIN-EC770
View tableView in ArticleTable 1. Results of single coating samples by SIN-EC770
浸锌漆 黑色漆 底漆 厚度值/μm 227 54.8 282
Table 2. Results of single coating samples by DE algorithm
View tableView in ArticleTable 2. Results of single coating samples by DE algorithm
样品 厚度/μm 折射率 浸锌漆 223.87±0.22 3.967±0.004 黑色漆 54.18±0.05 2.091±0.002 底漆 284.95±0.08 1.869±0.001
Table 3. Measurement errors (angle offset
θ =1°)View tableView in ArticleTable 3. Measurement errors (angle offset
θ =1°)误差/μm θ=1° θ=2° θ=3° θ=4° θ=5° 浸锌漆 0.04 0.16 0.35 0.63 0.99 黑色漆 0.02 0.08 0.18 0.32 0.50 底漆 0.12 0.47 1.05 1.88 2.94
Table 4. Results of the double coating sample by terahertz method
View tableView in ArticleTable 4. Results of the double coating sample by terahertz method
DE 厚度
/μm厚度标准
差/μm折射率 折射率
标准差银漆 54.04 0.85 6.76 0.01 底漆 52.42 0.95 3.56 0.01
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Hong-zhen ZHANG, Ming-xia HE, Li-li SHI, Peng-fei WANG. Terahertz Thickness Measurement Based on Stochastic Optimization Algorithm[J]. Spectroscopy and Spectral Analysis, 2020, 40(10): 3066
Paper Information
Category: Research Articles
Received: Sep. 10, 2019
Accepted: --
Published Online: Jun. 18, 2021
The Author Email: ZHANG Hong-zhen (zhanghongzhen2018@163.com)
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