设计了用于制冷型红外双波段探测器的、广角光学系统,并进行了被动式消热差设计。镜头由6片透镜组成,通过不同镜片材料搭配来进行消色差设计,实现在环境温度-40~70℃范围内被动式消热差。光学系统采用中长波共焦面设计,设计波段为3.5~4....设计了用于制冷型红外双波段探测器的、广角光学系统,并进行了被动式消热差设计。镜头由6片透镜组成,通过不同镜片材料搭配来进行消色差设计,实现在环境温度-40~70℃范围内被动式消热差。光学系统采用中长波共焦面设计,设计波段为3.5~4.9μm和7.5~9.5μm,焦距为11 mm, F数为1.6,全视场角150°。结果表明,此光学系统工作范围大、结构简单、透过率高,能够实现在全工作温度范围内成像质量良好。展开更多
annular beam tri-heterodyne confocal microscope has been proposed to improve the anti-environmental interference capability and the resolution of a eonfoeal microscope. It simultaneously detects far-, on-, and near-fo...annular beam tri-heterodyne confocal microscope has been proposed to improve the anti-environmental interference capability and the resolution of a eonfoeal microscope. It simultaneously detects far-, on-, and near-focus signals with given phase differences by dividing the measured light path of the eonfoeal microscope into three sub-paths （signals）. Pair-wise real-time heterodyne subtraction of the three signals is used to improve the anti-environmental interference capability, axial resolution, and linearity; and a shaped annular beam super-resolution technique is used to improve lateral resolution. Theoretical analyses and preliminary experiments indicate that an axial resolution of about 1 nm can be achieved with a shaped annular beam tri-heterodyne confoeal microscope and its lateral resolution can be better than 0.2 um for A = 632.8 nm, the numerical aperture of the lens of the microscope is NA = 0.85, and the normalized radius e = 0.5.展开更多
In this paper, evaporation of sessile water droplets containing fluorescent polystyrene （PS） microparticles on polydimethylsiloxane （PDMS） surfaces with different curing ratios was studied experimentally using las...In this paper, evaporation of sessile water droplets containing fluorescent polystyrene （PS） microparticles on polydimethylsiloxane （PDMS） surfaces with different curing ratios was studied experimentally using laser confocal microscopy. At the beginning, there were some microparticles located at the contact line and some microparticles moved towards the line. Due to contact angle hysteresis, at first both the contact line and the microparticles were pinned. With the depinning contact line, the microparticles moved together spontaneously. Using the software Image J, the location of contact lines at different time were acquired and the circle centers and radii of the contact lines were obtained via the least square method. Then the average distance of two neighbor contact lines at a certain time interval was obtained to characterize the motion of the contact line. Fitting the distance-time curve at the depinning contact line stage with polynomials and differentiating the polynomials with time, we obtained the velocity and acceleration of both the contact line and the microparticles located at the line. The velocity and the maximum acceleration were, respectively, of the orders of 1 p.m/s and 20-200 nm/s2, indicating that the motion of the microparticles located at the depinning contact line was quasi-static. Finally, we presented a theoretical model to describe the quasi-static process, which may help in understanding both self-pinning and depinning of microparticles.展开更多
文摘设计了用于制冷型红外双波段探测器的、广角光学系统,并进行了被动式消热差设计。镜头由6片透镜组成,通过不同镜片材料搭配来进行消色差设计,实现在环境温度-40~70℃范围内被动式消热差。光学系统采用中长波共焦面设计,设计波段为3.5~4.9μm和7.5~9.5μm,焦距为11 mm, F数为1.6,全视场角150°。结果表明,此光学系统工作范围大、结构简单、透过率高,能够实现在全工作温度范围内成像质量良好。
基金Project supported by the National Natural Science Foundation of China （Grant No 50475035）, the Doctoral Program of Higher Education of China （Grant No 20050213035） and the Program for New Century Excellent Talents in University of China （Grant No NCET-05-0348）.
文摘annular beam tri-heterodyne confocal microscope has been proposed to improve the anti-environmental interference capability and the resolution of a eonfoeal microscope. It simultaneously detects far-, on-, and near-focus signals with given phase differences by dividing the measured light path of the eonfoeal microscope into three sub-paths （signals）. Pair-wise real-time heterodyne subtraction of the three signals is used to improve the anti-environmental interference capability, axial resolution, and linearity; and a shaped annular beam super-resolution technique is used to improve lateral resolution. Theoretical analyses and preliminary experiments indicate that an axial resolution of about 1 nm can be achieved with a shaped annular beam tri-heterodyne confoeal microscope and its lateral resolution can be better than 0.2 um for A = 632.8 nm, the numerical aperture of the lens of the microscope is NA = 0.85, and the normalized radius e = 0.5.
基金supported by the National Natural Science Foundation of China(Grant Nos.11572114,11572335,and U1562105)the Opening Fund of State Key Laboratory of Nonlinear Mechanics(LNM)+1 种基金the CAS Strategic Priority Research Program(Grant No.XDB22040403)and the CAS Key Research Program of Frontier Sciences(Grant No.QYZDJ-SSW-JSC019)
文摘In this paper, evaporation of sessile water droplets containing fluorescent polystyrene （PS） microparticles on polydimethylsiloxane （PDMS） surfaces with different curing ratios was studied experimentally using laser confocal microscopy. At the beginning, there were some microparticles located at the contact line and some microparticles moved towards the line. Due to contact angle hysteresis, at first both the contact line and the microparticles were pinned. With the depinning contact line, the microparticles moved together spontaneously. Using the software Image J, the location of contact lines at different time were acquired and the circle centers and radii of the contact lines were obtained via the least square method. Then the average distance of two neighbor contact lines at a certain time interval was obtained to characterize the motion of the contact line. Fitting the distance-time curve at the depinning contact line stage with polynomials and differentiating the polynomials with time, we obtained the velocity and acceleration of both the contact line and the microparticles located at the line. The velocity and the maximum acceleration were, respectively, of the orders of 1 p.m/s and 20-200 nm/s2, indicating that the motion of the microparticles located at the depinning contact line was quasi-static. Finally, we presented a theoretical model to describe the quasi-static process, which may help in understanding both self-pinning and depinning of microparticles.
