为实现对爆炸温度场的动态测量,针对爆炸温度场变化快、范围广、温度高、难以测量的问题,提出一种基于高速成像技术的爆炸温度场测温方法。基于辐射原理推导出高速成像系统的温度测量模型,建立高速相机图像灰度值和被爆炸温度之间的对...为实现对爆炸温度场的动态测量,针对爆炸温度场变化快、范围广、温度高、难以测量的问题,提出一种基于高速成像技术的爆炸温度场测温方法。基于辐射原理推导出高速成像系统的温度测量模型,建立高速相机图像灰度值和被爆炸温度之间的对应关系,得到可通过控制高速成像系统曝光时间和透光率2个参数控制测温范围的算法;搭建高速成像爆炸温度场测量系统,用最小二乘法对系统进行标定,标定结果显示:该建模方法在2200~2900℃区间平均误差为0.74%,在1850~2350℃区间平均误差为1.95%,能够满足爆炸温度场的测量需求。运用搭建的系统与红外测温仪分别进行375 g、750 g及1500 g 3种药量的温压弹爆炸温度测量对比实验,实验结果表明:该系统与红外测温仪之间的温度测量值最大偏差为3.31%,实现了高响应速率及高分辨率测量。展开更多
针对传统嵌入式系统难以处理和显示高速大数据量的红外图像的问题,介绍了基于Xilinx公司集成了双核ARM和FPGA的全可编程Zynq SOC的高速红外成像系统,其FPGA实现探测器图像采集、非均匀校正、VDMA视频流传输等功能,ARM处理器运行Linux系...针对传统嵌入式系统难以处理和显示高速大数据量的红外图像的问题,介绍了基于Xilinx公司集成了双核ARM和FPGA的全可编程Zynq SOC的高速红外成像系统,其FPGA实现探测器图像采集、非均匀校正、VDMA视频流传输等功能,ARM处理器运行Linux系统,完成通过USB Wi Fi或千兆以太网的网络视频传输。实验结果显示该系统能够实现高速率、高分辨率的红外成像,功耗低,结构简单,通用性强。展开更多
Photoacoustic imaging acquires the absorption contrast of biological tissue with ultrasound resolution. It has been broadly investigated in biomedicine for animal and clinical studies. Recently, a micro-electromechani...Photoacoustic imaging acquires the absorption contrast of biological tissue with ultrasound resolution. It has been broadly investigated in biomedicine for animal and clinical studies. Recently, a micro-electromechanical system(MEMS) scanner has been utilized in photoacoustic imaging systems to enhance their performance and extend the realm of applications. The review provides a recap of recent developments in photoacoustic imaging using MEMS scanner, from instrumentation to applications. The topics include the design of MEMS scanner, its use in photoacoustic microscopy, miniature imaging probes, development of dual-modality systems,as well as cutting-edge bio-imaging studies.展开更多
文摘为实现对爆炸温度场的动态测量,针对爆炸温度场变化快、范围广、温度高、难以测量的问题,提出一种基于高速成像技术的爆炸温度场测温方法。基于辐射原理推导出高速成像系统的温度测量模型,建立高速相机图像灰度值和被爆炸温度之间的对应关系,得到可通过控制高速成像系统曝光时间和透光率2个参数控制测温范围的算法;搭建高速成像爆炸温度场测量系统,用最小二乘法对系统进行标定,标定结果显示:该建模方法在2200~2900℃区间平均误差为0.74%,在1850~2350℃区间平均误差为1.95%,能够满足爆炸温度场的测量需求。运用搭建的系统与红外测温仪分别进行375 g、750 g及1500 g 3种药量的温压弹爆炸温度测量对比实验,实验结果表明:该系统与红外测温仪之间的温度测量值最大偏差为3.31%,实现了高响应速率及高分辨率测量。
文摘针对传统嵌入式系统难以处理和显示高速大数据量的红外图像的问题,介绍了基于Xilinx公司集成了双核ARM和FPGA的全可编程Zynq SOC的高速红外成像系统,其FPGA实现探测器图像采集、非均匀校正、VDMA视频流传输等功能,ARM处理器运行Linux系统,完成通过USB Wi Fi或千兆以太网的网络视频传输。实验结果显示该系统能够实现高速率、高分辨率的红外成像,功耗低,结构简单,通用性强。
基金the National Natural Science Foundation of China(No.61405112)the National High Technology Research and Development Program(863)of China(No.2015AA020944)
文摘Photoacoustic imaging acquires the absorption contrast of biological tissue with ultrasound resolution. It has been broadly investigated in biomedicine for animal and clinical studies. Recently, a micro-electromechanical system(MEMS) scanner has been utilized in photoacoustic imaging systems to enhance their performance and extend the realm of applications. The review provides a recap of recent developments in photoacoustic imaging using MEMS scanner, from instrumentation to applications. The topics include the design of MEMS scanner, its use in photoacoustic microscopy, miniature imaging probes, development of dual-modality systems,as well as cutting-edge bio-imaging studies.
