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Imager sCMOS PIV相机
Imager sCMOS PIV相机

Imager sCMOS PIV相机

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Imager sCMOS

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北京欧兰科技发展有限公司
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  • 第17年
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Depending on the requirements for your specific application LaVision offers different PIV cameras.
Imager sCMOS camera contains a new generation of  scientific CMOS (sCMOS) sensor and combines the advantages of modern CCD and CMOS sensor technologies resulting in an unsurpassed image  quality and system performance. The high resolution 5.5 million pixel  Imager sCMOS camera with extremely low readout noise and high frame  rates of 50 Hz at full resolution offers excellent imaging performance in the field of quantitative  scientific (laser) imaging.
 

相关方案

综合其他石油/化工环保航空航天生物产业
  • 流体中速度矢量场检测方案(粒子图像测速)
    The active control of laminar and turbulent flows with dynamical actuators is of great scientific and technological interest in nearly any field of fluid mechanics. On on hand it becomes possible to generate artifical flow structures whose properties and significance for the turbulent mixing, or their interaction with other flow structures, can be examined. On the other hand, these devices suppress flow separation on profiles or increase the performance of flow engines. Today, most of the well established actuator concepts are based on pneumatic and micro-mechanic basis. However, owing to their limited dynamic range their potential seems to be limited from the present point of view, see Gad-el-Hak (2001), and also their technical implementation is sometimes difficult. In the following an optical actuator concept is proposed and examined that allows to excite the flow non-intrusively with nearly any pulse-width and repetition-rate.

    其他 2012-08-19

  • 翼型,冰风洞中速度矢量场检测方案(粒子图像测速)
    The separation bubble on a NACA 0012 airfoil with a two-dimensional, constant span, simulated leading-edge glaze-ice accretion is investigated using Particle Image Velocimetry (PIV). Chordwise PIV measurements, or those along the separation bubble cross-section, are obtained at a Reynolds number of 0.9x106, Mach number of 0.20, and between 0 deg and 5 deg angle-of-attack. Mean reattachment estimated from surface oil-flow visualization indicates increasing bubble length and unsteadiness (based on reattachment zone width) with angle-of-attack, consistent with results extracted from PIV measurements. Timeaveraged streamlines and forward flow intermittency reveal a primary recirculation with clockwise rotation defined by a shear layer and a smaller, secondary recirculation with counter-clockwise rotation directly downstream of the point of separation, both consistent with backward-facing step type flowfields. Mean and RMS velocity component contours highlight these features and wall-normal profiles are extracted and compared to other separation bubble data including those over a backward-facing step and blunt flat plate.

    其他 2008-07-13

  • 微尺度流体中流场检测方案(粒子图像测速)
    Microscopic particle image velocimetry (microPIV) experiments were performed on a polydimethylsiloxane (PDMS) microchannel with a cross-section measuring 320 lm · 330 lm for Reynolds numbers between 272 and 2853. Care was taken to ensure that the seed particle density was great enough that accurate instantaneous velocity vector fields could be obtained for all the Reynolds numbers investigated. Velocity fluctuations were calculated from ensembles of microPIV velocity fields. The hu0i/umax fluctuation showed an increase at Re = 1535 and a further increase as Reynolds numbers were increased, suggesting that transition to turbulence began near Re = 1535, a Reynolds number lower than predicted by classical theory. The hu0i/umax data also suggest the flow was fullydeveloped at a Reynolds number between 2630 and 2853, also lower than classical results. This finding was confirmed in plots of the mean velocity profile. For the fully developed flow, the measured hu0 i/umax fluctuation agreed well with classical results for turbulent duct flow, but the hv0 i/umax fluctuation was 25–40% lower than turbulent duct flow results. Finally, spatial correlations of velocity fluctuations were calculated to lend some insights into the characteristics of the large-scale turbulent structures observed in the turbulent microchannel flow.

    其他 2008-06-27

  • 气泡中分离,速度场检测方案(粒子图像测速)
    Vortex generator jets (VGJs) have proven to be effective in minimizing the separation losses on low-pressure turbine blades at low Reynolds numbers. Experimental data collected using phase-locked particle image velocimetry and substantiated with a hot-film anemometer were used to answer fundamental questions about the influence of VGJs on a separated boundary layer. The data were collected on the suction surface of the Pack B blade profile, which has a non-reattaching separation bubble beginning at 68% axial chord. Two VGJ pulse histories were created with different frequencies, jet durations,and duty cycles. The mechanisms responsible for boundary layer separation control were shown to be a combination of boundary layer transition and streamwise vortical structures. Jet duration and relaxation time were important VGJ characteristics in determining the extent of control. The unsteady environment characterisitic of the low-pressure turbine section in a gas turbine engine effectively reduces the time-averaged separation zone by as much as 35%. Upstream blade rows create unsteady flow disturbances (wakes) that transition the flow. This transitioned flow propagates downstream, re-attaching the separation bubbles on the subsequent blade row. Phase-locked PIV and hot-film measurements were used to document the characteristics of this separation zone when subjected to synchronized unsteady wakes and VGJs. The phase difference between VGJ actuation and the wake passing, blowing ratio, and VGJ duration were optimized to achieve the greatest timeaveraged control of the separation zone. The experimental data were used to identify the important characteristics of the wake/jet interaction. Phase-locked PIV measurements were taken to isolate the wake event.

    其他 2008-06-05

  • 流体中速度矢量场检测方案(粒子图像测速)
    The active control of laminar and turbulent flows with dynamical actuators is of great scientific and technological interest in nearly any field of fluid mechanics. On on hand it becomes possible to generate artifical flow structures whose properties and significance for the turbulent mixing, or their interaction with other flow structures, can be examined. On the other hand, these devices suppress flow separation on profiles or increase the performance of flow engines. Today, most of the well established actuator concepts are based on pneumatic and micro-mechanic basis. However, owing to their limited dynamic range their potential seems to be limited from the present point of view, see Gad-el-Hak (2001), and also their technical implementation is sometimes difficult. In the following an optical actuator concept is proposed and examined that allows to excite the flow non-intrusively with nearly any pulse-width and repetition-rate.

    其他 2012-08-19

  • 流体中速度场检测方案(粒子图像测速)
    Tomographic particle image velocimetry is a 3D PIV technique based on the illumination, recording, reconstruction and analysis of tracer-particle motion within a three-dimensional measurement volume. The recently developed technique makes use of several simultaneous views of the illuminated particles, typically 4, and their three-dimensional reconstruction as a light-intensity distribution by means of optical tomography. The reconstruction is performed with the MART algorithm (multiplicative algebraic reconstruction technique), yielding a 3D distribution of light intensity discretized over an array of voxels. The reconstructed tomogram pair is then analyzed by means of 3D crosscorrelation with an iterative multigrid volume-deformation technique, returning the three-component velocity vector distribution over the measurement volume. The implementation of the tomographic technique in time-resolved mode by means of high repetition rate PIV hardware has the capability to yield 4D velocity information. The first part of the chapter describes the operation principles and gives a detailed assessment of the tomographic reconstruction algorithm performance based upon a computer-simulated experiment. The second part of the chapter proposes four applications on two flow cases: 1. the transitional wake behind a circular cylinder; 2. the turbulent boundary layer developing over a flat plate. For the first case, experiments in air at ReD = 2700 are described together with the experimental assessment of the tomographic reconstruction accuracy.

    其他 2012-07-16

  • 流体,多相流,两相流,气泡流中速度矢量场检测方案(粒子图像测速)
    A new experimental procedure for performing simultaneous, phase-separated velocity measurements in two-phase flows is introduced. Basically this Particle Image Velocimetry (PIV) technique is a combination of the three most often used PIV techniques in multiphase flows: PIV with fluorescent tracer particles, shadowgraphy and the digital phase separation with a masking technique. In order to combine the advantages of these multiphase-PIV methods a new PIV setup was developed. With this setup the velocity distributions of the two phases are measured simultaneously with only one b/w camera. This experimental set-up is aimed at providing a means for characterizing the modification of turbulence in the liquid phase by bubbles, this phenomenon is often called “pseudo-turbulence” (van Wijngaarden, 1998).

    其他 2011-06-13

  • 冷却反应器中INL在棱镜气体冷却反应器下腔室比例模型上获得流动现象基准数据来验证CFD模拟的有效性的项目计划检测方案(粒子图像测速)
    The experimental program that is being conducted at the Matched Index-of-Refraction (MIR) Flow Facility at Idaho National Laboratory (INL) to obtain benchmark data on measurements of flow phenomena in a scaled model of the lower plenum of a typical prismatic gas-cooled reactor (GCR) using 3-D Particle Image Velocimetry (PIV) is presented. A detailed description of the model, scaling, the experimental facility, 3-D PIV system, measurement uncertainties, experimental procedures and samples of the data sets that have been obtained are included. Samples of the data set that are presented include mean-velocity-field and turbulence data in an approximately 1:7 scale model of a region of the lower plenum. This experiment has been selected as the first Standard Problem endorsed by the Generation IV International Forum. Results concentrate on the region of the lower plenum near its far reflector wall (away from the outlet duct). Inlet jet Reynolds numbers (based on the jet diameter and the time-mean flow rate) are approximately 4,300 and 12,400. The measurements reveal undeveloped, non-uniform flow in the inlet jet ducts and complicated flow patterns in the modeled lower plenum. Data include three-dimensional vector plots, data displays along the coordinate planes (slices) and charts that describe the component flows at specific regions in the model. Information on inlet flow is also presented.

    其他 2011-05-15

  • 油中温度和压力对处于贫油预混预蒸发燃烧阶段火焰的影响检测方案(烟气分析仪)
    The purpose of this experimental work is to study lean premixed n-heptane/air flames in order to identify the factors governing flame structure and flame stabilization. The experimental burner is composed of a cylindrical combustion chamber placed in a pressurized and cooled casing. Downstream, a converging nozzle with variable section allows to rise the pressure up to 8 bar inside the combustion chamber. Combustion air can be preheated up to 600°C. The n-heptane/air injector is a radial swirler injector which induces an estimated value of 1.74 for the swirl number. The premix tube is a 70mm length and 10 mm diameter cylinder. The droplets are detected by laser tomographic imaging and their size is measured by light diffraction. The reacting zone is visualized by CH* chemiluminescence imaging and the structure of inner recirculation zone by P-LIF-OH imaging. The analysis of laser tomographic images points out the pre-heating effect on the vaporization of liquid fuel. At T = 25°C and P = 1 bar, droplets are not totally evaporated in spite of their small initial diameter, (50 μm without combustion). Totally prevaporized regime is achieved for temperature values above 100°C. Measurements of CH* chemiluminescence for a fixed mean flow velocity V = 70 m/s, and for T = 25°C, 100°C and 200°C show that the flame remains weakly anchored at the nozzle exit. The flame stability evolves with the combustion air temperature and is linked with the position of the Inner Recirculation Zone (IRZ). On the other hand the pressure is a stabilizing factor for constant conditions of velocity and equivalence ratio, because the position of the IRZ does not fluctuates. At constant injection velocity, aerodynamic structure is modified by pressure increasing. At a given critical pressure value, the flame becomes unstable until it reaches a stable flash-back state.

    石油/化工 2012-01-24

  • 酸，碱，盐溶液中水溶性酸，碱，盐溶液表面统一的分子图像检测方案(其它光谱仪)
    The molecular structure of the interfacial regions of aqueous electrolytes is poorly understood, despite its crucial importance in many biological, technological, and atmospheric processes. A long-term controversy pertains between the standard picture of an ion-free surface layer and the strongly ion specific behavior indicating in many cases significant propensities of simple inorganic ions for the interface. Here, we present a unified and consistent view of the structure of the air/solution interface of aqueous electrolytes containing monovalent inorganic ions. Molecular dynamics calculations show that in salt solutions and bases the positively charged ions, such as alkali cations, are repelled from the interface, whereas the anions, such as halides or hydroxide, exhibit a varying surface propensity, correlated primarily with the ion polarizability and size. The behavior of acids is different due to a significant propensity of hydronium cations for the air/solution interface. Therefore, both cations and anions exhibit enhanced concentrations at the surface and, consequently, these acids (unlike bases and salts) reduce the surface tension of water. The results of the simulations are supported by surface selective nonlinear vibrational spectroscopy(VSFG), which reveals among other things that the hydronium cations are present at the air/solution interface. The ion specific propensities for the air/solution interface have important implications for a whole range of heterogeneous physical and chemical processes, including atmospheric chemistry of aerosols, corrosion processes, and bubble coalescence.

    石油/化工 2008-04-26

  • 羟基中多线羟基标志测速技术用于反应和非反应实验流体检测方案(粒子图像测速)
    A new compact micro-lens optical system has been developed to produce a 7 x 7 multiline optical grid for Hydroxyl Tagging Velocimetry (HTV). These lines provide additional spatial information and aid the software tracking of the flowfield by increasing its resolution. Single-photon photodissociation of groundstate H2O by a ~193-nm ArF excimer laser “writes” a 7 x 7 beam molecular grid with very long gridlines of superequilibrium OH and H photoproducts in either room air flowfields or in H2-Air flames due to the presence of H2O vapor. The displaced OH tag lines’ positions are revealed through fluorescence by A2Σ+ (v′= 0) ← X2Πi (v″ = 0) OH excitation using a ~308 nm pulsed frequency-doubled dye laser. A time-of-flight software (DaVis 6.0 Stereo PIV/PTV, LaVision, GmbH) determines the instantaneous velocity field. HTV tag lifetime comparisons between experimental results and theoretical predictions are discussed.

    石油/化工 2008-02-14

  • 龙卷风中周围建筑物对龙卷风导致的底层建筑物风载荷的影响检测方案(粒子图像测速)
    Low-rise buildings located in the urban areas are generally surrounded by buildings of similar size. The interference of surrounding buildings has been found to be significant on wind loads in straight-line winds. In this study, systematic experiments of tornado-induced wind loads and flow patterns around a typical low-rise gable-roof building with different layouts of surrounding buildings were carried out in a laboratory. Effects of spacing, height ratios of the surrounding buildings to the test building and specific building orientations were considered. The results indicate that the reduction of the horizontal load is caused by sheltering effect from the surrounding buildings. The uplift load, however, could increase or decrease dependent on building orientation, layout and the type of the surrounding buildings. The complicated flow patterns around the test building are discussed and correlated to the wind loads. This study would improve the understanding of tornado-induced loads on a low-rise gable-roof building

    环保 2011-02-15

  • 空气中空化流动负反馈控制降阶模型的建立检测方案(粒子图像测速)
    Controlling the flow over aerodynamic bodies has been a challenging problem for many years. Different open loop control techniques have been used in several flow configurations with some degree of success. However, in most cases the effectiveness of the controller is limited to the design conditions. In the present work, Proper Orthogonal Decomposition (POD) is used to derive low dimensional models of the subsonic flow over a cavity, in an effort to develop a feedback control system that can control the characteristic of the flow field. The Galerkin method is used as an additional tool to capture the time evolution of the flow field, reducing the problem into a system of ordinary differential. The stochastic estimation method is then used to link the variables that can be physically measured with those involved in the model. Particle Image Velocimetry (PIV) data and surface pressure measurement for the unforced flow (baseline) and for several open loop forcing conditions are used to derive the models.

    航空航天 2011-02-14

  • 朝天水母中生成的摄食和交换水流研究检测方案(粒子图像测速)
    Understanding how the hydrodynamics of feeding, nutrient and gas exchange is affected by the morphology and orientation of jellyfish is important to distinguish their individual mechanisms of foraging. The differences between the currents generated by oblate medusa that rest on the ocean floor and the more commonly observed free-swimming medusa have previously not been explored. The pulsing kinematics and fluid flow around the upside-down jellyfish, Cassiopea spp., contained in laboratory aquaria is experimentally investigated using a combination of videography and digital particle image velocimetry measurements. The phase-averaged flow generated by bell pulsations is similar to a vertical jet, with induced flow velocities on the order of 1-10 mm/s. The bell margin is pushed downward during full contraction in a manner not previously observed in free-swimming medusae kinematics, due to the fact that the Cassiopea bell rests against a solid surface. This introduces a strong near-horizontal entrainment of the fluid toward the oral arms unlike the mostly upstream entrainment observed in free-swimming medusae. There is no evidence of the formation of a train of vortex rings as observed in oblate medusae exhibiting rowing propulsion. This is primarily due to the difference in the morphology of Cassiopea in which the oral arms extend to radial lengths greater than the maximum bell diameter. The resulting net fluid motion is not dominated by flow-reversal regions, suggesting that Cassiopea brings in new fluid with each bell pulse for the purposes of filter feeding, oxygen exchange and excretion.

    生物产业 2011-02-24

相关仪器 相关资料
  • 层析PIV

    湍流本质上具有三维（3D）立体结构属性。普通的二维（2D）包 括采用激光照明的成像测量无法在所有三个空间维度上分辨湍流 的结构。而利用多视角成像信息，采用层析重构技术则可以在三 个空间维度上同时捕捉记录复杂流动的瞬态结构。应用针对体像 素的三维（3D）相关处理技术，可以由时间相关的体成像数据计 算出瞬态三维空间的流场。 LaVision功能强大的，基于层析粒子成像测速（Tomo-PIV）和层 析粒子跟踪测速（Tomo-PTV）技术的FlowMaster激光成像系统， 能够以极高的空间分辨率记录强湍流，火焰以及喷雾对象的瞬态 体视流场。

    29025MB 2016-09-14
  • 利用2维粒子成像测速技术研究鲨鱼自由游动的水动力学推动机制用于优化水中船舶的推进特性

    Two-dimensional velocity fields around a freely swimming freshwater black shark fish in longitudinal (XZ) plane and transverse (YZ) plane are measured using digital particle image velocimetry (DPIV). By transferring momentum to the fluid, fishes generate thrust. Thrust is generated not only by its caudal fin, but also using pectoral and anal fins, the contribution of which depends on the fish’s morphology and swimming movements. These fins also act as roll and pitch stabilizers for the swimming fish. In this paper, studies are performed on the flow induced by fins of freely swimming undulatory carangiform swimming fish (freshwater black shark, L = 26 cm) by an experimental hydrodynamic approach based on quantitative flow visualization technique. We used 2D PIV to visualize water flow pattern in the wake of the caudal, pectoral and anal fins of swimming fish at a speed of 0.5–1.5 times of body length per second.

    6233MB 2016-08-26
  • 游动的未成熟海胆幼虫的个体发育变化和湍流中的取向

    Many marine organisms have complex life histories, having sessile adults and relying on the planktonic larvae for dispersal. Larvae swim and disperse in a complex fluid environment and the effect of ambient flow on larval behavior could in turn impact their survival and transport. However, to date, most studies on larvae–flow interactions have focused on competent larvae near settlement. We examined the importance of flow on early larval stages by studying how local flow and ontogeny influence swimming behavior in pre-competent larval sea urchins, Arbacia punctulata. We exposed larval urchins to grid-stirred turbulence and recorded their behavior at two stages (4- and 6-armed plutei) in three turbulence regimes. Using particle image velocimetry to quantify and subtract local flow, we tested the hypothesis that larvae respond to turbulence by increasing swimming speed, and that the increase varies with ontogeny.

    502MB 2016-08-26
  • 落到倾斜箔片上的液体薄膜流动的时间空间分辨热传导过程的实验研究

    This paper describes the development of an experimental technique that combines simultaneous planar laser-induced fluorescence (PLIF) and infrared (IR) thermography imaging, and its application to the measurement of unsteady and conjugate heat-transfer in harmonically forced, thin liquid-film flows falling under the action of gravity over an inclined electrically heated-foil substrate. Quantitative, spatiotemporally resolved and simultaneously conducted measurements are reported of the film thickness, film free-surface temperature, solid–liquid substrate interface temperature, and local/instantaneous heat flux exchanged with the heated substrate. Based on this information, local and instantaneous heat-transfer coefficients (HTCs) are recovered. Results concerning the local and instantaneous HTC and how this is correlated with the local and instantaneous film thickness suggest considerable heat-transfer enhancement relative to steady-flow predictions in the thinner film regions.

    2829MB 2016-08-26
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