Infrared Physics & Technology最新文献_第10页

A study on an improved laser speckle contrast blood flow imaging methodology 关于改进型激光斑点对比血流成像方法的研究

IF 3.1 3区物理与天体物理

Infrared Physics & Technology Pub Date : 2024-08-16 DOI: 10.1016/j.infrared.2024.105512

引用次数: 0

Improved lightweight infrared road target detection method based on YOLOv8 基于 YOLOv8 的改进型轻量级红外道路目标探测方法

IF 3.1 3区物理与天体物理

Infrared Physics & Technology Pub Date : 2024-08-15 DOI: 10.1016/j.infrared.2024.105497

{"title":"Improved lightweight infrared road target detection method based on YOLOv8","authors":"","doi":"10.1016/j.infrared.2024.105497","DOIUrl":"10.1016/j.infrared.2024.105497","url":null,"abstract":"<div>Infrared-based road scene object detection algorithms often face issues with excessive parameters and computational demands, making them incompatible with edge devices having constrained computational capabilities. This paper introduces an enhanced lightweight infrared-based road object detection algorithm based on YOLOv8n. Firstly, a streamlined network architecture is devised by merging YOLOv8n’s C2f module with PConv, creating a lighter module and reducing the neural network’s downsampling rate of infrared images. This strategy reduces redundant computations and memory access, preventing the loss of fine details in infrared images caused by deep convolutional neural networks. Additionally, the model’s accuracy in detecting infrared targets is significantly enhanced through the integration of the coordinate attention mechanism. Finally, replacing CIoU with Wise-IoU for bounding box regression in YOLOv8n accelerates the model’s convergence. Empirical findings indicate that in contrast to the YOLOv8n algorithm, the optimized model showcases a 34.17 % reduction in model size, a 40.35 % decrease in parameters, and a 4.8 % increase in average detection accuracy. This enhanced algorithm not only achieves a lightweight profile but also delivers superior performance on embedded edge devices.</div>","PeriodicalId":13549,"journal":{"name":"Infrared Physics & Technology","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2024-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141993651","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Computational modeling and virtual analysis using a moving heat source to join AZ61A and AA7075 alloys with the application of a titanium alloy interlayer 使用移动热源连接 AZ61A 和 AA7075 合金的计算建模和虚拟分析，并应用钛合金夹层

IF 3.1 3区物理与天体物理

Infrared Physics & Technology Pub Date : 2024-08-15 DOI: 10.1016/j.infrared.2024.105501

{"title":"Computational modeling and virtual analysis using a moving heat source to join AZ61A and AA7075 alloys with the application of a titanium alloy interlayer","authors":"","doi":"10.1016/j.infrared.2024.105501","DOIUrl":"10.1016/j.infrared.2024.105501","url":null,"abstract":"<div>Laser beam welding (LBW) uses a concentrated laser beam to fuse materials, providing benefits such as a smaller heat-affected zone (HAZ), speed, accuracy, adaptability across multiple materials, and seamless adoption into automation processes. Achieving optimal weld quality with LBW remains difficult due to the need to select the appropriate welding process variables and proper interlayer between dissimilar materials. Due to the high cost and safety risks to operators and equipment in LBW, it is challenging to use the practical experiment. Additionally, welding materials with high thermal conductivity and lower melting temperatures, such as AZ61A and AA7075, is a considerable challenge. Previous research focused on process parameters in laser beam welding of various metals, but not enough consideration has been given to the effect of a titanium interlayer on AA7075 and AZ61A using virtual data. This study aims to fill these gaps by using simulation data to assess the effects of process parameters and the titanium interlayer during LBW of dissimilar materials. A backpropagation neural network with the gradient descent learning rule was used for optimization, and a central composite design was used to predict the optimal process parameter interaction. The result indicates the optimum equivalent strain is obtained at the values of beam radius between 4.5 to 5 mm. The maximum equivalent stress reached during welding speed is between 4 to 4.5 mm/s. The maximum residual stress was obtained at the number of segments of 160. The predicted maximum and average anticipated errors for peak temperature are 0.1655 % and 0.0210 %, while for residual stress it is computed as 0.1766 % and 0.0754 %. The Ti-interlayer in magnesium and aluminum laser welding reduces peak temperatures, allows for uniform energy distribution, minimizes localized heating, and enhances weld quality while lowering residual stress.</div>","PeriodicalId":13549,"journal":{"name":"Infrared Physics & Technology","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2024-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142012716","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

∼2μm luminescence and energy transfer mechanism in highly Ho3+/Tm3+ co-doped bismuth glass ∼高Ho3+/Tm3+共掺铋玻璃中的2μm发光和能量传递机制

IF 3.1 3区物理与天体物理

Infrared Physics & Technology Pub Date : 2024-08-14 DOI: 10.1016/j.infrared.2024.105507

{"title":"∼2μm luminescence and energy transfer mechanism in highly Ho3+/Tm3+ co-doped bismuth glass","authors":"","doi":"10.1016/j.infrared.2024.105507","DOIUrl":"10.1016/j.infrared.2024.105507","url":null,"abstract":"<div>Highly Ho3+/Tm3+ co-doped Bi2O3-B2O3-Al2O3-BaF2 glasses were fabricated using the melt-quenching technique. The emission, radiation, and gain characteristics of the glass samples at the wavelength of 2.0 μm were examined analyzed. An intense and broad 2.0 µm emission, resulting from the 3F4→3H6 transition of Tm3+ and the 5I6→5I7 transition of Tm3+, was detected under the stimulation of 808 nm LD. The gain coefficient of Ho3+ in Ho3+/Tm3+ co-doped glass reaches 7.81 cm−1(at 2050 nm), which is 7.5 times as high as that of tellurite glass. Meanwhile, the large σemi × Δλeff(39.84 × 10-26 cm3) and σemi × τrad(16.10 × 10-21 cm2 ms) indicated BBTH4 glass possessed a large gain property and broadband. The energy transfer process of Tm3+: 3F4 ↔ Ho3+:5I7 was analyzed, the CD-A is 90 times larger than the CA-D. The Ho3+/Tm3+ co-doped Bi2O3-B2O3-Al2O3-BaF2 glasses show potential as broadband mid-infrared emission gain material.</div>","PeriodicalId":13549,"journal":{"name":"Infrared Physics & Technology","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2024-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142002088","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

DGFusion: An effective dynamic generalizable network for infrared and visible image fusion DGFusion：用于红外和可见光图像融合的有效动态通用网络

IF 3.1 3区物理与天体物理

Infrared Physics & Technology Pub Date : 2024-08-14 DOI: 10.1016/j.infrared.2024.105495

{"title":"DGFusion: An effective dynamic generalizable network for infrared and visible image fusion","authors":"","doi":"10.1016/j.infrared.2024.105495","DOIUrl":"10.1016/j.infrared.2024.105495","url":null,"abstract":"<div>The objective of infrared and visible image fusion is to generate a unified image that highlights prominent targets and retains intricate texture details, even in scenarios with imbalanced source image information. However, current image fusion algorithms primarily consider factors like illumination, restricting their applicability to certain scenes and compromising their adaptability. To tackle the issue, this paper proposes the DGFusion, which utilizes TWSSLoss to balance the contribution of source images in the fused output, effectively mitigating the limitations linked to relying solely on illumination guidance. Additionally, modality-complement feature attention harmonizer (MCFAH) facilitates cross-modal channel attention learning. This process assigns weights to features and accomplishes fusion by exchanging cross-modal differential information, thereby enriching each feature with details from the other modality. Furthermore, the multi convolution attentive net (MCAN) dynamically adjusts the contributions of features from different modalities. It prioritizes the most expressive characteristics to accentuate complementary information, enabling efficient fusion. In conclusion, our method outperforms seven state-of-the-art alternatives in terms of preserving target details and retaining texture information. Rigorous generalization experiments across five diverse datasets demonstrate the robustness of our DGFusion model in various scenarios.</div>","PeriodicalId":13549,"journal":{"name":"Infrared Physics & Technology","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2024-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141993650","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Infrared low-altitude and slow-speed small target detection via fusion of target sparsity and motion saliency 通过目标稀疏性和运动显著性的融合实现红外低空慢速小目标探测

IF 3.1 3区物理与天体物理

Infrared Physics & Technology Pub Date : 2024-08-14 DOI: 10.1016/j.infrared.2024.105492

{"title":"Infrared low-altitude and slow-speed small target detection via fusion of target sparsity and motion saliency","authors":"","doi":"10.1016/j.infrared.2024.105492","DOIUrl":"10.1016/j.infrared.2024.105492","url":null,"abstract":"<div>Infrared (IR) small target detection exerts a significant role in IR early warning and UAV surveillance. However, in the low-altitude slow-speed small (LSS) target detection scene, the existing algorithms cannot effectively suppress high-contrast corners and sparse edges in the low-altitude background, resulting in many false alarms. To solve this problem, we propose an IR LSS target detection method based on fusion of target sparsity and motion saliency (TSMS). In the low-rank sparse model, we introduce a robust dual-window gradient operator to construct a fine local prior, which avoids the influence of highlighted edges and corners; The Geman norm is used to approximate the background rank to accurately estimate the background and effectively extract sparse targets. Then, a motion saliency model based on inter-frame local matching is constructed to accurately extract the inter-frame features of small target. Finally, the real LSS target is obtained by fusing target sparsity and motion saliency. Experiments indicate that, compared with existing advanced methods, the proposed method has stronger robustness and can effectively detect LSS targets under complex low-altitude background.</div>","PeriodicalId":13549,"journal":{"name":"Infrared Physics & Technology","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2024-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142076990","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Collaborative representation based unsupervised CNN for hyperspectral anomaly detection 基于协作表示的无监督 CNN 用于高光谱异常检测

IF 3.1 3区物理与天体物理

Infrared Physics & Technology Pub Date : 2024-08-14 DOI: 10.1016/j.infrared.2024.105498

引用次数: 0

Hundred-watt Ho:YAG oscillator pumped by high-power Tm:YLF laser with orthogonal cylindrical lenses spot shaping 采用正交圆柱透镜光斑整形的高功率 Tm:YLF 激光器泵浦的百瓦级 Ho:YAG 振荡器

IF 3.1 3区物理与天体物理

Infrared Physics & Technology Pub Date : 2024-08-14 DOI: 10.1016/j.infrared.2024.105510

引用次数: 0

Supercontinuum generation by nonlinear polarization rotation mode-locked fiber laser with pulse type switchable 可切换脉冲类型的非线性偏振旋转锁模光纤激光器产生超连续光

IF 3.1 3区物理与天体物理

Infrared Physics & Technology Pub Date : 2024-08-14 DOI: 10.1016/j.infrared.2024.105508

引用次数: 0

High sensitivity and low noise photodetector based on topological crystalline insulator SnTe/Si heterostructure 基于拓扑晶体绝缘体锡碲/硅异质结构的高灵敏度低噪声光电探测器

IF 3.1 3区物理与天体物理

Infrared Physics & Technology Pub Date : 2024-08-14 DOI: 10.1016/j.infrared.2024.105486

{"title":"High sensitivity and low noise photodetector based on topological crystalline insulator SnTe/Si heterostructure","authors":"","doi":"10.1016/j.infrared.2024.105486","DOIUrl":"10.1016/j.infrared.2024.105486","url":null,"abstract":"<div>Topological insulators, as a class of materials with narrow bulk bandgap and gapless surface states with response wavelengths covering infrared to terahertz, have great potential for application in new generation photodetector, but the large dark current and small photocurrent limit their application, so the device performance is generally improved by the method of heterogeneous integration. SnTe, as a topological crystalline insulator with multiple surface states, has a narrower forbidden bandwidth, it is suitable for the fabrication of infrared photodetector. In this work, SnTe thin films were deposited on Si substrates by magnetron sputtering, and SnTe/n-Si heterostructure photodetectors were fabricated on this basis. The photodetector exhibited good photoresponses in the visible near-infrared (532–1400 nm), with the responsivity (R) and normalized detectivity (D*) reaching 1.12 A/W, 5.17 × 1011 Jones. Thanks to the formation of the built-in electric field at the SnTe/Si interface, the photogenerated carriers can be rapidly separated and transported, and the switching ratio reaches 103. In addition, the rise time and fall time of the device are 218 μs and 174 μs, respectively. The good performance and simple preparation method make the device have a wide application prospect in the new generation of photodetector.</div>","PeriodicalId":13549,"journal":{"name":"Infrared Physics & Technology","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2024-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141997534","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0