Multimode fiber(MMF)possesses intrinsic,ultrathin,noninvasive geometric characteristics and high mode density optical characteristics,having great potential in endoscopic imaging[1,2].A typical MMF endoscopic imaging ...Multimode fiber(MMF)possesses intrinsic,ultrathin,noninvasive geometric characteristics and high mode density optical characteristics,having great potential in endoscopic imaging[1,2].A typical MMF endoscopic imaging system involves a camera placed behind the fiber distal end to calibrate the transmission matrix(TM)of the fiber,and when imaging into narrow channels,such as bronchus,or performing insertion into brain tissues,the camera should be replaced by a single-pixel detector placed outside in a reflection mode to record the signal.A traditional MMF imaging system adopts the point scan mode,whose resolution is limited by the numerical aperture(NA)of the fiber,and the imaging speed is restricted by the refresh rate of the modulator and the Nyquist sampling law.The need for high resolution,high speed,and three-dimensional(3D)imaging for observation of biological processes,such as neural activity,blood flow detection,and cellular dynamics,calls for original imaging approaches.展开更多
介绍了某醋厂灌装生产线装箱机械手控制系统,该系统由S7-300 PLC控制器、触摸屏、伺服放大器、同步伺服电机、机械手等组成。以S7-300 PLC作为主控制器,通过PROF IBU S-DP现场总线来控制伺服放大器以及现场执行设备,伺服放大器驱动伺服...介绍了某醋厂灌装生产线装箱机械手控制系统,该系统由S7-300 PLC控制器、触摸屏、伺服放大器、同步伺服电机、机械手等组成。以S7-300 PLC作为主控制器,通过PROF IBU S-DP现场总线来控制伺服放大器以及现场执行设备,伺服放大器驱动伺服电机通过减速箱带动机械手进行精确的速度和位置控制。旋转变压器采样速度和位置从而构成速度、位置双闭环控制。抓、放瓶过程分成多段速度,在各段采用不同的P I调节参数,从而有效消除抖动。系统可以实现自动寻参考点,自学习、手动操作,自动操作4大功能。自安装调试成功以来,系统运行良好、性能可靠,极大地提高了劳动生产率。展开更多
Compared with traditional waveform digitization with flash-ADCs, waveform digitization with switched-capacitor arrays (SCAs) is able to achieve the sampling speed above 1 GS/s without degrading the analog to digital c...Compared with traditional waveform digitization with flash-ADCs, waveform digitization with switched-capacitor arrays (SCAs) is able to achieve the sampling speed above 1 GS/s without degrading the analog to digital conversion precision significantly. In this paper, we present the implementation of a fast waveform digitization system with the use of SCAs, and evaluate its performance of waveform digitization and the waveform timing. At about 5 GS/s, the dynamic input range of the digitizer is about 66 dB, and its timing precision is about 20 ps (RMS).展开更多
基金supported by the National Natural Science Foundation of China(61735017,61822510,62020106002,and 62005250)the National Key Basic Research Program of China(2021YFC2401403)Major Scientific Research Project of Zhejiang Lab(2019MC0AD02)。
文摘Multimode fiber(MMF)possesses intrinsic,ultrathin,noninvasive geometric characteristics and high mode density optical characteristics,having great potential in endoscopic imaging[1,2].A typical MMF endoscopic imaging system involves a camera placed behind the fiber distal end to calibrate the transmission matrix(TM)of the fiber,and when imaging into narrow channels,such as bronchus,or performing insertion into brain tissues,the camera should be replaced by a single-pixel detector placed outside in a reflection mode to record the signal.A traditional MMF imaging system adopts the point scan mode,whose resolution is limited by the numerical aperture(NA)of the fiber,and the imaging speed is restricted by the refresh rate of the modulator and the Nyquist sampling law.The need for high resolution,high speed,and three-dimensional(3D)imaging for observation of biological processes,such as neural activity,blood flow detection,and cellular dynamics,calls for original imaging approaches.
基金Supported by the Knowledge Innovation Program of the Chinese Academy of Sciences (KJCX2-YW-N27)the National Natural Science Foundation of China (No. 11175176)
文摘Compared with traditional waveform digitization with flash-ADCs, waveform digitization with switched-capacitor arrays (SCAs) is able to achieve the sampling speed above 1 GS/s without degrading the analog to digital conversion precision significantly. In this paper, we present the implementation of a fast waveform digitization system with the use of SCAs, and evaluate its performance of waveform digitization and the waveform timing. At about 5 GS/s, the dynamic input range of the digitizer is about 66 dB, and its timing precision is about 20 ps (RMS).
