High accuracy terahertz computed tomography using a 3D printed super-oscillatory lens

Ning, Ran; Wang, Dayong; Zhao, Jie; Rong, Lü; Wang, Yunxin

doi:10.1016/j.optlaseng.2023.107610

Cited by 4 publications

(2 citation statements)

References 45 publications

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“…However, selective laser melting (SLM) technology has some drawbacks, such as the challenging removal of powder residue and potential structural deformations [29,30]. To ensure that the printed products are fit for use, before proceeding with further experiments, we used a CT scanner to inspect its internal structure [31,32]. The inspection results are depicted in the following figure, Figure 9.…”

Section: Quality Inspection Of Heat Pipe Printingmentioning

confidence: 99%

Simulation of, Optimization of, and Experimentation with Small Heat Pipes Produced Using Selective Laser Melting Technology

Zhou,

Teng,

Shen

et al. 2023

Materials

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With the development of microsatellite technology, the heat generated by onboard components is increasing, leading to a growing demand for improved thermal dissipation in small satellites. Metal powder additive manufacturing technology offers the possibility of customizing and miniaturizing heat pipes to meet the specific requirements of small satellites. This article introduces a small-scale heat pipe designed using selective laser melting (SLM) technology. The heat pipe’s material, structure, and internal working fluid were determined based on mission requirements. Subsequently, the SolidWorks 2021 software was used for heat pipe modeling, and the ANSYS 2021R2 finite element analysis software was employed to simulate the heat transfer performance of the designed heat pipe, confirming its feasibility. The heat pipe’s structure was optimized using multi-objective regression analysis, considering various structural parameters, such as the channel diameter, vapor chamber height, and narrow gap width. The simulation results demonstrate that the optimized heat pipe achieved a 10.5% reduction in thermal resistance and an 11.6% increase in equivalent thermal conductivity compared to the original heat pipe. Furthermore, compared to conventional metal heat-conducting rods, the optimized heat pipe showed a 38.5% decrease in thermal resistance and a 62.19% increase in equivalent thermal conductivity. The heat pipe was then fabricated using a 3D printer (EOS M280), and a vacuum experimental system was established to investigate its heat transfer characteristics. The experimental results show that the heat pipe operated most efficiently at a heating power of 20 W, reached its maximum heat transfer capacity at 22 W, and had an optimal fill ratio of 30%. These results highlight the excellent performance of the heat pipe and the promising application prospects for SLM technology in the field of small satellites.

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Section: Quality Inspection Of Heat Pipe Printingmentioning

confidence: 99%

Simulation of, Optimization of, and Experimentation with Small Heat Pipes Produced Using Selective Laser Melting Technology

Zhou,

Teng,

Shen

et al. 2023

Materials

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“…The experimental results showed that the full width at half maximum (FWHM) of the super-oscillating focal spot was ~94 μm, which broke through the diffraction limit of 115 μm. In 2023, Ning et al fabricated a long-focal-depth TSOL for THz tomography [15]. It had 20 concentric binary rings within an effective area of 25 mm working at 0.3 THz.…”

Section: Introductionmentioning

confidence: 99%

Implementation of THz confocal imaging based on super-oscillating lens, Fibonacci lens and transmissive convex lens

Yang,

Rong,

et al. 2024

Terahertz Photonics III

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Terahertz (THz) waves have many important characteristics, e.g., fingerprint spectrum, low energy and penetrability, thus show great potential and wide application value in many fields such as biomedical imaging, industrial nondestructive testing, cultural relics protection, security inspection and anti-terrorism. With the development of THz sources and detectors, the progress of THz imaging is also constantly advancing. THz confocal imaging realizes high axial resolution by removing stray light of the non-focus planes by point illumination and small aperture diaphragm. This imaging approach obtains object depth information layer-by-layer. In this paper, we illustrated a THz confocal scanning imaging system which three types of lenses are designed and used to verify its focal capability for imaging illumination, i.e., THz super-oscillating lens (TSOL), Fibonacci lens (FBL) and transmissive convex lenses (TCL). TSOL can produce long focal depth and subwavelength focused beam. FBL is a diffractive lens that produces multiple foci along the axial coordinate. TCL produces one focal point in far-field, which is the typical THz lens applied in various THz imaging systems. The implementation and calibration of three types of THz confocal imaging systems are introduced in detail, thereafter the corresponding results are shown and compared.

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Optimized galvanometric illumination for terahertz full-field imaging and computed tomography

Ning,

Wang,

Zhang

et al. 2025

Optics and Lasers in Engineering

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High accuracy terahertz computed tomography using a 3D printed super-oscillatory lens

Cited by 4 publications

References 45 publications

Simulation of, Optimization of, and Experimentation with Small Heat Pipes Produced Using Selective Laser Melting Technology

Simulation of, Optimization of, and Experimentation with Small Heat Pipes Produced Using Selective Laser Melting Technology

Implementation of THz confocal imaging based on super-oscillating lens, Fibonacci lens and transmissive convex lens

Optimized galvanometric illumination for terahertz full-field imaging and computed tomography

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