1 山东大学 激光与红外系统集成技术教育部重点实验室，山东 青岛 266237
2 山东大学 信息科学与工程学院，山东 青岛 266237
3 华东电子测量仪器研究所，山东 青岛 266555
为了满足光电探测设备对不同温度环境下多波段的目标模拟需求，设计了一种便携式红外目标模拟器，选用可切换的黑体光源来进行照明，实现3~5 μm和8~14 μm的中波红外和长波红外的辐射特性。作为准直系统的平行光管口径为110 mm，考虑到中心遮挡问题，采用离轴反射式光学结构。在装调时利用该结构对300 mm口径的参考平面镜进行测量，测试结果PV值为0.356λ（λ=632.8 nm），RMS值为0.047λ。采用MSC. Patran进行建模，利用有限元分析方法完成了系统的光机热分析，在−10~50 ℃工作环境下，由温度变化引起的主次镜面形变化为纳米级别，对中红外波段可实现实时稳定成像，为光电探测设备提供宽波段的多种直接模拟目标。
光学工程 目标模拟器 光学设计 平行光管 optical engineering target simulator optical design collimator 红外与激光工程
2023, 52(3): 20220554
Author Affiliations
Abstract
1 School of Materials Science and Engineering, Shanghai University of Engineering Science, Shanghai 201620, P. R. China
2 School of Materials Science and Engineering, Shanghai University, Shanghai 200444, P. R. China
In this work, Li2CO3 was added into 0.70.30.01molMnO2 (70BFBTMn) piezoelectric ceramics to reduce their sintering temperatures. 70BFBTMn ceramics were sintered by a conventional solid reaction method, and their structural, dielectric, piezoelectric and ferroelectric properties were studied. These results indicate that 0.5% (mole) Li2CO3 is the optimized content and it can reduce the sintering temperature by 100C, making the possibility of the piezoelectric ceramics cofiring with Ag electrodes at low temperatures to manufacture multilayer piezoelectric actuators.In this work, Li2CO3 was added into 0.70.30.01molMnO2 (70BFBTMn) piezoelectric ceramics to reduce their sintering temperatures. 70BFBTMn ceramics were sintered by a conventional solid reaction method, and their structural, dielectric, piezoelectric and ferroelectric properties were studied. These results indicate that 0.5% (mole) Li2CO3 is the optimized content and it can reduce the sintering temperature by 100C, making the possibility of the piezoelectric ceramics cofiring with Ag electrodes at low temperatures to manufacture multilayer piezoelectric actuators.
Piezoelectric ceramics BiFeO3–BaTiO3 low temperature co-fired ceramic technology Journal of Advanced Dielectrics
2022, 12(6): 2241003
1 河北建筑工程学院土木工程学院，张家口 075000
2 河北省土木工程诊断、改造与抗灾重点实验室，张家口 075000
3 中建筑港集团有限公司，青岛 266032
4 青岛海陆通工程质量检测有限公司，青岛 266032
为提高粉煤灰的综合利用率，降低原料成本，采用未经磨细和分选的原状粉煤灰等质量替代硅灰来制备超高性能混凝土(UHPC)，并研究了不同掺量的原状粉煤灰对UHPC力学性能及微观结构的影响。结果表明：原状粉煤灰的掺入可使UHPC中胶凝材料的粒度呈梯度分布，形成良好的微级配；并且使新拌混凝土的流动度增大，影响了钢纤维在UHPC基体中的分布；当原状粉煤灰掺重不超过30%时，UHPC抗折强度随着原状粉煤灰掺量的增加呈现不同程度的增长，30%原状粉煤灰掺量的UHPC抗折强度与不掺粉煤灰的空白样相比提高了34%；由于原状粉煤灰水化缓慢，当原状粉煤灰掺量在0%~40%时，UHPC抗压强度随着原状粉煤灰掺量的增加有所下降。孔结构分析表明：UHPC的平均孔径以及总孔体积均随着原状粉煤灰的掺入而减小，基体更加密实；当原状粉煤灰掺量为30%时，SEM照片显示钢纤维与UHPC基体结合紧密，界面黏结增强。
超高性能混凝土 原状粉煤灰 力学性能 孔径分析 微观结构 ultra-high performance concrete raw fly ash mechanical property pore analysis microstructure
Author Affiliations
Abstract
1 Sino-Dutch Biomedical and Information Engineering School, Northeastern University, Shenyang 110819, P. R. China
2 The Key Laboratory of Molecular Imaging, Chinese Academy of Sciences, Zhongguancun East Road #95, Haidian Dist. Beijing 100190, P. R. China
Bioluminescence tomography (BLT) is a novel optical molecular imaging technique that advanced the conventional planar bioluminescence imaging (BLI) into a quantifiable three-dimensional (3D) approach in preclinical living animal studies in oncology. In order to solve the inverse problem and reconstruct tumor lesions inside animal body accurately, the prior structural information is commonly obtained from X-ray computed tomography (CT). This strategy requires a complicated hybrid imaging system, extensive post imaging analysis and involvement of ionizing radiation. Moreover, the overall robustness highly depends on the fusion accuracy between the optical and structural information. Here, we present a pure optical bioluminescence tomographic (POBT) system and a novel BLT workflow based on multi-view projection acquisition and 3D surface reconstruction. This method can reconstruct the 3D surface of an imaging subject based on a sparse set of planar white-light and bioluminescent images, so that the prior structural information can be offered for 3D tumor lesion reconstruction without the involvement of CT. The performance of this novel technique was evaluated through the comparison with a conventional dual-modality tomographic (DMT) system and a commercialized optical imaging system (IVIS Spectrum) using three breast cancer xenografts. The results revealed that the new technique offered comparable in vivo tomographic accuracy with the DMT system (P > 0:05) in much shorter data analysis time. It also offered significantly better accuracy comparing with the IVIS system (P < 0:04) without sacrificing too much time.
Optical surface reconstruction bioluminescence tomography reconstruction optical molecular imaging light flux reconstruction Journal of Innovative Optical Health Sciences
2017, 10(3): 1750003
Author Affiliations
Abstract
1 State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Opto-Electronics, Shanxi University, Taiyuan 030006, China
2 Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China
Nonclassical optical frequency combs play essential roles in quantum computation in the continuous variable regime. In this work, we generate multimode nonclassical frequency comb states using a degenerate type-I synchronously pumped optical parametric oscillator and directly observe the squeezing of the leading five temporal modes of femtosecond pulsed light. The overlapping spectra of these modes mean that the temporal modes are suitable for use in real-world quantum information applications.
270.6570 Squeezed states 190.7110 Ultrafast nonlinear optics Chinese Optics Letters
2017, 15(9): 092703
1 中国电子科技集团公司第四十一研究所, 山东 青岛 266555
2 电子测试技术重点实验室, 山东 青岛 266555
为满足长波红外探测器绝对光谱响应度参数的高准确度测量要求, 提高长波红外激光的功率稳定性, 优化激光光束质量, 研制了一套长波红外激光源。针对CdTe晶体的电光效应设计了一套提高长波红外激光功率稳定性的实验系统。利用激光光束传输原理设计了长波红外波段空间滤波器, 并分析了其各项参数的计算方法。实验结果表明: 长波红外激光的光功率不稳定度提升至0.1%以上, 长波红外激光的光束质量也得到显著提升, 满足了长波红外探测器绝对光谱响应度高准确度测量对光源的性能要求。
长波红外 绝对光谱响应度 功率稳定性 光束质量 低温辐射计 long-wave infrared absolute spectral responsivity power stability beam quality cryogenic radiometer 红外与激光工程
2017, 46(12): 1205002
1 哈尔滨理工大学 自动化学院, 哈尔滨 150080
2 中国科学院 自动化研究所 分子影像重点实验室, 北京 100190
为了实现小动物光声断层信号的高速采集和实时高质量图像的重建, 采用了覆盖角度为270°的128阵元弧形聚焦超声换能器、4个32通道的NI公司数据采集模块和可调谐脉冲激光器以及正则化优化的基于模型的光声断层重建算法。结果表明, 系统的空间分辨率可以达到180μm;此系统可以在1ms内完成光声断层数据的采集, 在40s以内获得高质量的重建图像。该系统可以用于开展小动物在体的多光谱光声断层成像实验研究。
生物光学 光声断层成像 多元弧形聚焦换能器 高速多通道 多光谱 biotechnology photoacoustic tomography multi-element arc-shaped focusing transducer high-speed multi-channel multispectral
1 杭州电子科技大学 数字媒体与艺术设计学院, 浙江 杭州 310018
2 浙江大学 海洋学院, 浙江 舟山 316021
3 杭州蓝科光电科技有限公司, 浙江 杭州 310018
多光谱成像是一项非常有前景的图像高保真获取与再现技术, 近年来在水下物体颜色还原的应用中也受到的极大的需求和关注。然而, 不同于空气中的物体的成像过程, 在水下成像过程中, 当光通过水而进行传播, 光被水体严重吸收和散射, 导致图像变暗, 在其光谱和颜色方面发生模糊和扭曲。文中讨论的是基于水下图像的水衰减系数的校准和其多光谱图像的光谱重构。首先在不同的距离处获取物体的图像, 提出了基于不同距离的图像进行水体衰减系数的校准并恢复原始图像的技术; 在此基础上, 分析并导出满足系数校准和图像复原所需的在不同距离获取到的最少的原始图像个数。最后, 通过比较复原的水下图像与空气中获取的彩色图像, 实验结果证明: 文中提出的技术能够对水下光谱图像的进行精确颜色复原, 所有测试图像的平均相对残留误差仅为5.87％。
多光谱成像 水衰减系数校准 水下图像恢复 multispectral imaging water attenuation coefficient calibration underwater image restoration 红外与激光工程
2017, 46(3): 0323001
1 中国电子科技集团公司第四十一研究所, 山东 青岛 266555
2 电子测试技术国防科技重点实验室, 山东 青岛 266555
为了实现中红外探测器绝对光谱响应度高准确度的测量, 从理论和实验上研究了中红外波段激光的功率稳定性的提高和光束质量的优化方法。采用声光调制和反馈控制的方法, 把中红外激光的功率稳定性提高到0.1%以内; 根据高斯光束传输理论计算了所需空间滤波器的各项参数, 设计了中红外空间滤波器, 搭建了相应的实验装置, 显著提高了中红外激光光束质量。为中红外绝对光谱响应度的高准确度测量提供了一个可靠的中红外波段激光光源。
中红外 绝对光谱响应度 光束质量 功率稳定性 mid-infrared absolute spectral responsivity beam quality power stability 红外与激光工程
2016, 45(7): 0705005
