Chinese Journal of Lasers, Volume. 48, Issue 20, 2014004(2021)
Influence of Paper Shelters on Terahertz Double Exposure Digital Holography
Figures & Tables(12)
![Schematic diagrams of double exposure principle. (a) Schematic diagram of double exposure iteration[13]; (b) simulation flowchart of influence of shelters; (c) schematic diagram of Tukey window function](/Images/icon/loading.gif){kind=icon}
Fig. 1. Schematic diagrams of double exposure principle. (a) Schematic diagram of double exposure iteration[13]; (b) simulation flowchart of influence of shelters; (c) schematic diagram of Tukey window function
Fig. 3. Actual photos of imaging targets. (a) Lateral resolution is 0.2 mm; (b) lateral resolution is 0.3 mm
Fig. 4. Experimental results of paper parameter measurement. (a) Illumination light image; (b) average hologram of 60 frames of single B5 paper; (b2) reconstructed amplitude image and (b3) histogram of single B5 paper after single exposure APRA and cutting; (c1) average hologram of 60 frames of thermal paper; (c2) reconstructed amplitude image and (c3) histogram of thermal paper after single exposure APRA and cutting
Fig. 5. Experimental results of detector noise measurement. (a) Image of double-layer B5 paper on detector surface; (b) corresponding histogram and Gaussian fitting curve
Fig. 6. Target scenes, holograms, and reconstructed amplitude images of target with lateral resolution of 0.2 mm. (a1)--(a5) No shelter; (b1)--(b5) thermal paper shelter; (c1)--(c5) B5 paper shelter
Fig. 7. Target scenes, holograms, and reconstructed amplitude images of target with lateral resolution of 0.3 mm. (a1)--(a3) No shelter; (b1)--(b3) thermal paper shelter; (c1)--(c3) B5 paper shelter
Fig. 8. Normalized holograms and reconstructed amplitude images of target with lateral resolution of 0.2 mm. (a1)(a2) B5 paper shelter; (b1)(b2) thermal paper shelter; (c1)(c2) no shelter
Fig. 9. Normalized holograms and reconstructed amplitude images of the target with a lateral resolution of 0.3 mm.(a1)(a2) B5 paper shelter; (b1)(b2) thermal paper shelter
Fig. 10. Reconstructed amplitude image of target with lateral resolution of 0.3 mm
Table 1. Mean value and contrast ratio calculated from simulation results
View tableTable 1. Mean value and contrast ratio calculated from simulation results
Target resolution /mm Shelter M1 M21 M22 C1 C2 MSE 0.2 No shelter in Fig.6 (a4)0.25 0.83 0.80 0.69 0.68 0.002 0.2 Thermal paper in Fig.6 (b4)0.23 0.72 0.64 0.68 0.64 0.029 0.2 B5 paper in Fig.6 (c4)0.17 0.54 0.48 0.68 0.64 0.139 0.2 No shelter in Fig.6 (a5)0.39 0.89 0.90 0.57 0.57 0.006 0.2 Thermal paper in Fig.6 (b5)0.38 0.80 0.76 0.54 0.50 0.037 0.2 B5 paper in Fig.6 (c5)0.36 0.67 0.62 0.45 0.41 0.116 0.3 No shelter in Fig.7 (a3)0.40 0.88 0.88 0.55 0.54 0.013 0.3 Thermal paper in Fig.7 (b3)0.35 0.80 0.76 0.56 0.53 0.044 0.3 B5 paper in Fig.7 (c3)0.34 0.66 0.63 0.48 0.45 0.122
Table 2. Mean value and contrast ratio calculated from experimental results
View tableTable 2. Mean value and contrast ratio calculated from experimental results
Target resolution /mm Shelter M1 M21 M22 C1 C2 MSE 0.2 No shelter 0.24 0.58 0.80 0.59 0.71 0.048 0.2 Thermal paper 0.33 0.52 0.53 0.37 0.38 0.118 0.3 Thermal paper 0.38 0.65 0.71 0.42 0.46 0.103 0.3 B5 paper 0.34 0.44 0.45 0.23 0.24 0.239
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Keyang Cheng, Qi Li. Influence of Paper Shelters on Terahertz Double Exposure Digital Holography[J]. Chinese Journal of Lasers, 2021, 48(20): 2014004
Paper Information
Category: terahertz technology
Received: Feb. 21, 2021
Accepted: Mar. 29, 2021
Published Online: Sep. 8, 2021
The Author Email: Cheng Keyang (c1092986874@163.com)
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