红外焦平面的数字读出是信息化发展的必然方向,其关键技术是数字读出电路。介绍了数字读出电路的发展现状和主要架构,重点分析了时间噪声和空间噪声的来源和影响,并给出低噪声设计指导。同时对线性度、动态范围和帧频等主要性能进行了讨...红外焦平面的数字读出是信息化发展的必然方向,其关键技术是数字读出电路。介绍了数字读出电路的发展现状和主要架构,重点分析了时间噪声和空间噪声的来源和影响,并给出低噪声设计指导。同时对线性度、动态范围和帧频等主要性能进行了讨论,设计了两款数字读出电路。采用列级ADC数字读出架构设计了640×512数字焦平面探测器读出电路,读出噪声测试结果为150μV,互连中波探测器测试NETD为13 m K。基于数字像元读出架构设计了384×288数字焦平面探测器读出电路,互连长波探测器测试NETD小于4 m K,动态范围超过90 dB,帧频达到1000 Hz。所设计的两款读出电路有效提升了红外焦平面的灵敏度、动态范围和帧频等性能,表明数字读出电路技术对红外探测器性能的提升具有重要作用。展开更多
An easy-to-implement yet practical single-camera microscopic stereo-digital image correlation(stereo-DIC) technique is proposed for surface three-dimensional(3D) deformation measurement of singe lap joint(SLJ) samples...An easy-to-implement yet practical single-camera microscopic stereo-digital image correlation(stereo-DIC) technique is proposed for surface three-dimensional(3D) deformation measurement of singe lap joint(SLJ) samples subjected to mechanical loads. The basic principles, optical configurations and implementation procedures of the proposed technique are described in detail. Compared with existing single-camera 2D-DIC technique, which has been regularly used for in-plane deformation measurement of a SLJ specimen, the proposed technique offers the special merit of simultaneously determining all the three displacement components by simply adding two additional optical elements to existing single-camera 2D-DIC systems. The accuracy and effectiveness of the proposed technique is demonstrated by measuring the 3D deformation of a SLJ specimen subjected to quasi-static tensile loads.展开更多
文摘红外焦平面的数字读出是信息化发展的必然方向,其关键技术是数字读出电路。介绍了数字读出电路的发展现状和主要架构,重点分析了时间噪声和空间噪声的来源和影响,并给出低噪声设计指导。同时对线性度、动态范围和帧频等主要性能进行了讨论,设计了两款数字读出电路。采用列级ADC数字读出架构设计了640×512数字焦平面探测器读出电路,读出噪声测试结果为150μV,互连中波探测器测试NETD为13 m K。基于数字像元读出架构设计了384×288数字焦平面探测器读出电路,互连长波探测器测试NETD小于4 m K,动态范围超过90 dB,帧频达到1000 Hz。所设计的两款读出电路有效提升了红外焦平面的灵敏度、动态范围和帧频等性能,表明数字读出电路技术对红外探测器性能的提升具有重要作用。
基金supported by the National Natural Science Foundation of China(Grant Nos.1127203211322220 and 11427802)+2 种基金the Program for New Century Excellent Talents in University(Grant No.NCET-12-0023)the Science Fund of State Key Laboratory of Automotive Safety and Energy(Grant No.KF14032)Beijing Nova Program(Grant No.xx2014B034)
文摘An easy-to-implement yet practical single-camera microscopic stereo-digital image correlation(stereo-DIC) technique is proposed for surface three-dimensional(3D) deformation measurement of singe lap joint(SLJ) samples subjected to mechanical loads. The basic principles, optical configurations and implementation procedures of the proposed technique are described in detail. Compared with existing single-camera 2D-DIC technique, which has been regularly used for in-plane deformation measurement of a SLJ specimen, the proposed technique offers the special merit of simultaneously determining all the three displacement components by simply adding two additional optical elements to existing single-camera 2D-DIC systems. The accuracy and effectiveness of the proposed technique is demonstrated by measuring the 3D deformation of a SLJ specimen subjected to quasi-static tensile loads.
