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- 2019
- 2018
- infrared image
- target detection
- lucas–kanade method (LK)
- local contrast method (LCM)
- facet model
- target detection
- zero-crossing point
- Image processing
- Infrared camera
- Eye movement
- Optoelectronic Information Science and Engineering
- Chinese Academy of Sciences
- Gunma University
- University of Chinese Academy of Science
- Xi’an Institute of Optics and Precision Mechanics Chinese Academy of Science
- University of Science and Technology of China
- Space Star Technology Co. LTD
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<i>In vitro</i> and <i>in vivo</i> phasor analysis of stoichiometry and pharmacokinetics using short lifetime near-infrared dyes and time-gated imaging
摘要： We introduce a simple new approach for time-resolved multiplexed analysis of complex systems using near-infrared (NIR) dyes, applicable to in vitro and in vivo studies. We show that fast and precise in vitro quantification of NIR fluorophores? short (sub-nanosecond) lifetime and stoichiometry can be done using phasor analysis, a computationally efficient and user-friendly representation of complex fluorescence intensity decays obtained with pulsed laser excitation and time-gated camera imaging. We apply this approach to the study of binding equilibria by F?rster resonant energy transfer using two different model systems: primary/secondary antibody binding in vitro and ligand/receptor binding in cell cultures. We then extend it to dynamic imaging of the pharmacokinetics of transferrin engagement with the transferrin receptor in live mice, elucidating the kinetics of differential transferrin accumulation in specific organs, straightforwardly differentiating specific from non-specific binding. Our method, implemented in a freely-available software, has the advantage of time-resolved NIR imaging, including better tissue penetration and background-free imaging, but simplifies and considerably speeds up data processing and interpretation, while remaining quantitative. These advances make this method attractive and of broad applicability for in vitro and in vivo molecular imaging, and could be extended to applications as diverse as image guided-surgery or optical tomography.
关键词： Lifetime,Fluorescence,FRET,Mouse,Phasor,in vivo,binding equilibrium,transferrin,pharmacokinetics,Near-infrared
更新于2025-09-09 09:28:46
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High-frequency very long wave infrared quantum cascade detectors
摘要： High speed quantum cascade detectors (QCDs) in a very long wave infrared range have been fabricated and characterized. Based on the resonant longitudinal optical-phonon scattering extraction relaxation mechanism, the QCD material behaves at an intrinsically high speed. In order to achieve high speed operation, we integrated microwave technology into the device process to reduce the parasitic parameters and ensure a low time constant of the effective resistance, inductance, capacitance (RLC) circuit. The peak response is located at 14.2 μm at 77 K. The electrical response characteristics of these QCDs was tested using a microwave rectification technique. The ?3 dB cutoff frequency of a 100×100 μm2 QCD is 3.2 GHz. The cutoff behavior of our devices were modeled with a second order filter RLC circuit model and showed good agreement with the experimental data.
关键词： very long wave infrared,high speed,quantum cascade detectors
更新于2025-09-09 09:28:46
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[IEEE 2018 Condition Monitoring and Diagnosis (CMD) - Perth, WA (2018.9.23-2018.9.26)] 2018 Condition Monitoring and Diagnosis (CMD) - Infrared and Visible Image Fusion of Electric Equipment Using FDST and DC-PCNN
摘要： Multi-sensor image fusion leads to more abundant details and a better description of the electric equipment monitoring scene. To improve the accuracy of overheating fault localization, a novel image fusion method based on Finite Discrete Shearlet Transform (FDST) and Dual-Channel Pulse Coupled Neuron Network (DC-PCNN) is proposed for fusing infrared and visible images of electric equipment. Firstly, FDST is utilized to decompose the source images. Then, two modi?ed-spatial-frequency motivated DC-PCNNs with different linking strengths are used to fuse low-frequency and high-frequency subbands. Finally, the ?nal fused image is reconstructed from the fused subbands by inverse FDST. Experimental results demonstrate the proposed method can achieve a remarkable improvement in preserving detail information and outperform other typical fusion methods in both overall visual performance and objective criteria.
关键词： infrared and visible images,electric equipment,DC-PCNN,image fusion,FDST
更新于2025-09-09 09:28:46
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Effects of barrier energy offset and gradient in extended wavelength infrared detectors
摘要： The extended wavelength infrared photodetectors are new class of III-V semiconductor heterojunction-based photodetectors that can detect incoming radiation with an energy significantly smaller than the minimum energy gap (Δ) at the heterojunction interface. Architecture of these photodetectors include a barrier-emitter-barrier epilayers sandwiched between highly doped ohmic top and bottom contact layers. An energy offset (????) between the barriers is necessary for the extended wavelength photodetection. In this work, we study the performance of extended wavelength infrared photodetectors with varying ???? and gradient of the potential barrier. Results indicate that the extended wavelength threshold varied slightly with varying both the gradient and offset. Spectral responsivity, however, increased with the increasing offset and decreased with increasing gradient.
关键词： Extended wavelength infrared photodetectors,III-V semiconductors,GaAs/AlGaAs heterostructures
更新于2025-09-09 09:28:46
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Spectroscopic and thermal properties of stannadithiane compounds bearing endocyclic ether and lactone groups
摘要： Four related stannadithiane compounds containing different endocyclic functional groups -including ether (1), diether (2), lactone (3), and spirolactone (4)- were prepared. The conformational landscape has been fully determined for the 8-membered representative (compound 1) resulting in a distorted crown form with the butyl chains adopting an extended conformation. The infrared and Raman spectra of stannadithiane species have been measured and interpreted, aided by quantum chemical calculations and potential energy surface analysis. Special attention has been devoted to the analysis of the vibrational features of the heterocyclic moieties. The characteristic νas(Sn\S) and νs(Sn\S) stretching modes of the SnS2 endo-cyclic group were clearly observed in the Raman spectra at around 340 and 315 cm?1, respectively. The exo-cyclic ν(Sn\C) stretching modes were found near 590 and 565 cm?1 for the antisymmetric and symmetric motions, respectively. Thermal behavior for compounds 2–4 has been determined by thermogravimetric methods.
关键词： Raman,Stannadithiane,Pseudopotential,Conformation,Infrared,Tin compounds
更新于2025-09-09 09:28:46
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Water Filtered Infrared Radiation Decreases the Generation of Photodermatoses Dependent on Ultraviolet and Visible Radiation
摘要： The potential role of infrared radiation in photodermatoses has received very little attention, even though the main sources of radiation used for photobiological studies (UVA, UVB, and visible light) include infrared radiation. The objective of the work was assess whether infrared radiation is involved in the development of skin lesions in patients with different types of photodermatoses. Twenty patients with different photodermatoses were exposed to UVA, UVB, and visible radiation using a high pressure mercury UVA lamp, a fluorescent broadband UVB lamp, a tungsten bulb and a slide projector for visible radiation. Part of the radiation emitted by these lamps was water filtered to block infrared radiation above 1300 nm. All 20 patients developed lesions when exposed to different light sources used for phototest. When exposed to same sources without infrared radiation, 17 patients (85%) did not develop any lesions and the other three (15%) developed less severe lesions than in the area exposed to unfiltered light. Our results show that infrared radiation was necessary for the development of skin lesions in 85% of the patients with photodermatoses in our study. We believe that infrared radiation studies should be included in standard photobiology protocols.
关键词： Photodermatoses,Photodiagnosis,Phototest,Infrared radiation
更新于2025-09-09 09:28:46
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Rapid and sheet-to-sheet slot-die coating manufacture of highly efficient perovskite solar cells processed under ambient air
摘要： A nitrogen-free and slot-die coating fabrication of perovskite solar cells combined with NIR annealing. We develop a fabrication approach of planar inverted structured perovskite solar cell (PSC) in ambient condition with a PCE of 12.4% as compared to that (13.3%) of PSC fabricated in glove box filled with nitrogen. In addition, we demonstrate an alternative post-annealed method by near-infrared (NIR) radiation to traditional heating method by oven. The annealed time by NIR can be shortened from 1500 s to 30 s and the device performance over 10% can be achieved. The present work investigates the NIR effect for different layers in the two-step processing on the cell performance. The grazing-incidence wide-angle and small-angle X-ray scattering (GIWAXS and GISAXS) techniques for the perovskite layers are performed to reveal the crystalline and nano-morphological structures of perovskite layers correlated to thermal and NIR annealing effects. Based on this approach under ambient air, we scale up to the large-area fabrication using the slot-die coating. The performance of slot-die coated PSC can achieve to 12.3%. The critical step is the control of PbI2 layer thickness. We also applied the NIR radiation to the slot-die coated PSC and the PCE of 11.4% can be achieved. Our study paves a facile way to rapid manufacture and mass production of perovskite solar cells.
关键词： Perovskite solar cell,Two-steps,Near-infrared radiation,Slot-die,GIWAXS,GISAXS
更新于2025-09-09 09:28:46
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[IEEE IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium - Valencia, Spain (2018.7.22-2018.7.27)] IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium - Fast and Easy Integration and Classification of Hyperspectral Optical and Thermal Data: A Mineral Mapping Case Study
摘要： Independent spectral analysis is usually employed to analyse hyperspectral optical (visible: VIS, near infrared: NIR, shortwave infrared: SWIR) and thermal (longwave infrared: LWIR) data. The integration of the spectral information provided by different wavelength ranges and the subsequent complex classification still remains challenging. In this paper we will demonstrate the benefits of mineral classification employed to optical and thermal hyperspectral data (CASI and SASI: 0.4-2.5 μm; TASI: 8.6-11.5 μm) when using new tools (QUANTools) developed at the Czech Geological Survey (CGS). In this case study, the same approach was employed as published by Kopa?ková and Koucká (2017) [1], however, previously hyperspectral optical data were used together with multispectral long-wave infrared (LWIR) data. In this paper we demonstrate that the new concept, which was recently introduced, can be directly employed to CASI/SASI/TASI hyperspectral datasets and provide results in terms of mineral classification in a quick and easy way.
关键词： mineral mapping,optical spectral region,CASI,data integration,imaging spectroscopy,TASI,SASI,thermal infrared spectral region
更新于2025-09-09 09:28:46
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[IEEE 2018 IEEE Photonics Conference (IPC) - Reston, VA, USA (2018.9.30-2018.10.4)] 2018 IEEE Photonics Conference (IPC) - Low-Loss Silicon-Photonic Devices for Mid-Infrared Applications
摘要： We demonstrate low-loss silicon-on-insulator devices for 2-μm or longer wavelengths. We achieve waveguide loss as low as ~0.18 dB/cm and further demonstrate high quality factor micro-ring resonator with intrinsic Q of ~0.56 million and free spectral range of 100 GHz.
关键词： ring resonator,micro resonator,mid infrared,silicon photonics,nonlinear optics
更新于2025-09-09 09:28:46
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Comprehensive Analysis and Optimal Design of Ge/GeSn/Ge p-n-p Infrared Heterojunction Phototransistors
摘要： We present a comprehensive analysis of practical p-n-p Ge/Ge1?xSnx/Ge heterojunction phototransistors (HPTs) for design optimization for efficient infrared detection. Our design includes a Ge1?xSnx narrow-bandgap semiconductor as the active layer in the base layer, enabling extension of the photodetection range from near-infrared to mid-infrared to perform wide-range infrared detection. We calculate the current gain, signal-to-noise ratio (SNR), and optical responsivity and investigate their dependences on the structural parameters to optimize the proposed Ge1?xSnx p-n-p HPTs. The results show that the SNR is strongly dependent on the operation frequency and that the introduction of Sn into the base layer can improve the SNR in the high-frequency region. In addition, the current gain strongly depends on the Sn content in the Ge1?xSnx base layer, and a Sn content of 6%–9% maximizes the optical responsivity achievable in the infrared range. These results provide useful guidelines for designing and optimizing practical p-n-p Ge1?xSnx HPTs for high-performance infrared photodetection.
关键词： current gain,sign-to-noise ratio,infrared,heterojunction phototransistors,GeSn alloys
更新于2025-09-09 09:28:46