Study on Extraction Method of Terahertz Spectral Parameters of Rough Surface Samples

Fig. 1. Transmissive schematic diagram of THz through a sample with parallel and smooth surfaces (a); Transmissive schematic diagram of THz through a sample with rough surfaces (b)

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Fig. 2. Absorption waveforms of the #1 α-Lactose sample (a) and the #2 α-Lactose sample (b); Absorption waveforms of the #1 L-Histidine sample (c) and the #2 L-Histidine sample (d)

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$Refractive index waveforms of the #1 α-Lactose sample (a) and the #2 α-Lactose sample (b);Refractive index waveforms of the #1 L-Histidine sample (c) and the #2 L-Histidine sample (d)$

Fig. 3. Refractive index waveforms of the #1 α-Lactose sample (a) and the #2 α-Lactose sample (b);Refractive index waveforms of the #1 L-Histidine sample (c) and the #2 L-Histidine sample (d)

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Table 1. Information on the α-Lactose and L-Histidine sample
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Table 1. Information on the α-Lactose and L-Histidine sample
Sample Number Roughness/μm Averaged thickness/mm Weight/g Mass fraction/%
α-Lactose #1 145.20 1.58 0.44 4.88
#2 107.60 1.65 0.46 4.88
L-Histidine #1 131.20 1.76 0.48 10.01
#2 96.60 1.83 0.50 10.01

Table 2. The root-mean-square error (RMSE) of absorption coefficient extracted by the transmission model and the Duvillaret algorithm
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Table 2. The root-mean-square error (RMSE) of absorption coefficient extracted by the transmission model and the Duvillaret algorithm
Sample Transmission
model
[Eq. (7), (8)] Duvillaret
algorithm
[Eq. (1), (2)]
α-Lactose #1 21.89 88.57
#2 13.51 53.63
L-Histidine #1 22.04 73.38
#2 21.67 46.36

Table 3. The root-mean-square error (RMSE) of refractive index extracted by the transmission model and the Duvillaret algorithm
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Table 3. The root-mean-square error (RMSE) of refractive index extracted by the transmission model and the Duvillaret algorithm
Sample Transmission
model
[Eq. (7), (8)] Duvillaret
algorithm
[Eq. (1), (2)]
α-Lactose #1 0.12 0.36
#2 0.07 0.19
L-Histidine #1 0.05 0.33
#2 0.04 0.26

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Yang YU, Zhao-hui ZHANG, Xiao-yan ZHAO, Tian-yao ZHANG. Study on Extraction Method of Terahertz Spectral Parameters of Rough Surface Samples[J]. Spectroscopy and Spectral Analysis, 2022, 42(2): 386

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Paper Information

Category: Research Articles

Received: Feb. 1, 2021

Accepted: May. 5, 2021

Published Online: Apr. 2, 2022

The Author Email:

DOI:10.3964/j.issn.1000-0593(2022)02-0386-06

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. Information on the α-Lactose and L-Histidine sample

Table 1. Information on the α-Lactose and L-Histidine sample

Table 2. The root-mean-square error (RMSE) of absorption coefficient extracted by the transmission model and the Duvillaret algorithm

Table 2. The root-mean-square error (RMSE) of absorption coefficient extracted by the transmission model and the Duvillaret algorithm

Table 3. The root-mean-square error (RMSE) of refractive index extracted by the transmission model and the Duvillaret algorithm

Table 3. The root-mean-square error (RMSE) of refractive index extracted by the transmission model and the Duvillaret algorithm