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1.
针对单微悬臂梁生化检测系统中存在的温度漂移、溶液折射率变化等环境噪声影响和不能多目标检测等问题,设计制作了一种基于垂直腔面射型激光器阵列(VCSELs)的新型微悬臂梁阵列生化传感系统。利用双透镜组光路汇聚激光器阵列发出的激光束,依次照射到微悬臂梁阵列尖端进行精确定位扫描,实现了5根微悬臂梁变形信号的同步检测。该系统具有灵敏度高、一致性好、检测快速等优点。通过升降温动态实验测试,验证了该系统的稳定可靠性。上述结果为微悬臂梁阵列式生化传感技术的开展提供了一种新的方法和平台。  相似文献   

2.
基于建立的湿颗粒离散动力学模型,本文系统研究了钟摆状态下湿颗粒柱在重力驱动下的坍塌流动过程,主要考虑了颗粒粒径、液体表面张力系数和液体含量等参数对系统坍塌流动模式和动力学行为的影响。研究发现,在湿颗粒系统中,颗粒粒径和液体表面张力系数会改变颗粒间的毛细力大小,引起系统发生不同的坍塌流动模式,而液体含量仅定量影响颗粒坍塌后的堆积形态。在此基础上,进一步探讨了不同模式下系统坍塌流动行为与模型参数的相关性,发现无量纲Bond数是决定钟摆状态下湿颗粒物质坍塌流动动力学行为的本质因素。  相似文献   

3.
微梁免疫传感技术是在原子力显微镜和微机电系统基础上发展起来的一项新兴传感技术,具有检测灵敏度高、无需标记、能实时原位再现生化反应过程等优点。本文针对单梁传感系统中存在的环境扰动和不能多通道检测等问题进行改进,设计制作了一种基于压电扫描的新型微梁阵列免疫传感器。利用商品化微梁阵列对传感器进行了温度测试实验,所得信号曲线稳定一致,且检测灵敏度达到2nm,实验结果验证了该微梁阵列传感系统在多通道信号检测中的可行性,为微梁阵列生化传感技术的实现提供了一种新的方案。  相似文献   

4.
时朋朋 《力学学报》2021,53(12):3341-3353
金属磁记忆微磁检测方法, 利用铁磁材料局部磁性状态的变化, 进行应力集中或塑性区域位置及程度的检测与评价. 面向微磁信号的定量理论分析可对其工程领域应用提供重要指导. 本文介绍铁磁材料微弱环境磁场下的磁弹塑性本构进展, 及其在微磁信号分析方面的应用. 力磁本构关系方面, 针对微磁检测弱磁化条件, 基于有效场理论构建了受弹塑性载荷铁磁材料的理想磁化本构的显式解析式, 并结合接近原理分析了恒定外加微弱磁场下应力-应变对材料磁化强度的影响. 检测信号分析方面, 基于弹性力学理论、静磁学理论和新建立的磁弹塑性本构关系, 建立并求解了微弱磁场下铁磁试件中弹性应力或塑性区诱导的表面磁信号的二维分析模型. 结合实验结果证实其在刻画弹塑性因素对微磁信号影响规律方面的能力, 并详细分析了微磁信号的特征量与局部弹性应力或塑性区的尺寸间的相关关系. 相比已有力磁本构关系, 本文建立的显式解析形式的理想磁化更加简洁, 有助于提升对力磁耦合效应的定量化理解和应用.   相似文献   

5.
稳定性是动力系统定性理论研究的重要分支。真实的力学系统一般含有多个参数,系统的平衡和运动状态的稳定性随着参数的变化而发生改变。近40年来,参数对系统稳定性的影响引起人们的关注。参数变化后系统的稳定状态由邻近稳定域边界上特征值的性质决定,而特征值之间可能存在着复杂的耦合和分岔性质。  相似文献   

6.
轴压作用下充液圆柱壳屈曲的实验研究   总被引:2,自引:0,他引:2  
本文从实验及理论两个方面对充满液体的圆柱壳在轴向压力作用下液体内压的变化进行了实际测试及理论定性分析.采用薄壳理论分析了屈曲前液体内压随轴向压力的变化规律,讨论了壳材料、几何参数及边界约束对内压的影响.通过实验实际测定了内压随轴向压力的变化规律.通过实验手段测定了充满液体的圆柱壳临界载荷、屈曲模态,讨论了充满液体的圆柱壳的承载能力等问题.  相似文献   

7.
充分考虑压膜阻尼效应的影响,提出参数激励下时变电容式静电驱动微机电系统的动力学模 型,采用谐波平衡法分析在参数激励和强迫激励耦合作用下系统的幅频响应特性,探讨不同 控制电压和频率比对系统幅频响应的影响,分别以交流电压幅值、频率比和压膜阻尼比为控 制参数研究系统的非线性动力特性,结果表明,微尺度下静电驱动微机电系统在参数激励作 用下存在较为丰富的分岔与混沌行为,压膜阻尼效应对系统动力特性的影响不可忽视.  相似文献   

8.
CCD高精度位置检测的计算机模拟   总被引:5,自引:1,他引:4  
本文将高斯分布模型引入基于重心算法的CCD光斑位置检测系统,用计算机模拟试验系统地研究了模型参数对检测精度的影响,得到了模型参数最佳取值范围,在此基础上,本文针对实际系统进行了实验研究,获得了较高的检测精度。  相似文献   

9.
本文把梯度折射率介质的面内位移与其折射率梯度联系起来,对面内位移导致的折射率变化进行研究,介绍了GRIN介质用于面内位移测量的基本原理,给出了双光束干涉法测量悬壁梁挠度的实验方法和实验结果。  相似文献   

10.
GRIN介质用于面内位移的测量   总被引:1,自引:0,他引:1  
本文把梯度折射率(GRLN)介质的面内位移与其折射率梯度联系起来,对面内位移导致的折射率变化进行研究,介绍了GRIN介质用于面内位移测量的基本原理,给出了双光束干涉法测量悬臂梁挠度的实验方法和实验结果  相似文献   

11.
Application of optical techniques such as PIV, PTV, and LDA for velocity field estimation in porous media requires matching of refractive indices of the liquid phase to that of the solid matrix, including the channel walls. The methods most commonly employed to match the refractive indices have been to maximize the transmitted intensity through the bed or to rely on direct refractometer measurements of the indices of the two phases. Mismatch of refractive indices leads to error in estimation of particle position, ε PD, due to refraction at solid–liquid interfaces. Analytical ray tracing applied to a model of solid beads placed randomly along the optical path is used to estimate ε PD. The model, after validating against experimental results, is used to generate expression for ε PD as a function of refractive index mismatch for a range of bead diameters, bed widths, bed porosity, and optical magnification. The estimate of ε PD, which is found to be unbiased, is connected to errors in PIV measurement using the central limit theorem. Mismatch in refractive indices can also lead to reduction in particle density, N s, detected light flux, J, and degrade the particle image. The model, verified through experiments, is used to predict the reduction in N s and J, where it is found that particle defocusing caused by spherical beads in refractive index mismatched porous bed is the primary contributor to reductions of N s and J. In addition, the magnitude of ε PD is determined for the use of fluorescent dye emission for particle detection due to wavelength-dependent index of refraction.  相似文献   

12.
由于军事和商业应用的巨大潜力,红外成像技术至今仍是研究热点之一。针对本课题组提出的基于MEMS和光学读出的新型非制冷红外成像技术,本文一方面通过有限元仿真分析,详细讨论了新型无基底双材料微梁阵列FPA的热转换效率和热变形效率,另一方面通过光学理论分析,详细讨论了光学读出系统在极限操作下的光学测量灵敏度。理论和仿真分析显示,课题组提出的非制冷红外成像技术的NETD的理论极限与当前制冷型红外成像技术的典型指标相当,约为4mK。同时,本文对设计制作的FPA,在构建的系统上进行了红外实时成像实验和理论仿真分析,显示其系统级NETD已达到110mK。  相似文献   

13.
The transformation of the structure of the density, optical refractive index, temperature, and salinity fields in the regimes of formation and disintegration of convection flows under uniform sidewall cooling of a continuously stratified fluid is investigated using optical and probe techniques. Although the height of the individual cells is almost constant in the various stages of the process, the field patterns change significantly. In the formation stage the contributions of the temperature and salinity to the density distribution compensate each other, the density profile is smooth and the optical refractive index profile is stepped. In the disintegration stage the density profile also becomes stepped. At large times a new convection flow is formed on the external boundaries of the cells due to the temperature difference between the cooled inner fluid and the warmer outer (undisturbed) fluid, and this flow maintains the structure contrast as the motion degenerates.  相似文献   

14.
Refractive index matching methods for liquid flow investigations   总被引:2,自引:0,他引:2  
A difficulty common to most optical diagnostic techniques that are applied to fluid dynamics studies is the refraction of light passing through model and/or test section walls. The method of choice to eliminate refraction problems in liquid flows is to match refractive index. This paper presents techniques for refractive index matching including, (i) arrangement of test section and model, (ii) choice of solid and liquid materials, and (iii) methods for tuning the match. In addition, a new application of refractive index matching to liquid-liquid droplet studies is presented.The author would like to thank Rick James and Jon Martinez for their assistance in conducting the matching experiments and Professor Mickey Gunter for his comments on refractometry. We are grateful to the United States Department of Energy for financial support of the droplet work under Grant DE-FG07-86ER13572  相似文献   

15.
In speckle photograph technology, to determine the displacement of the points on the surface of the measured body, the conventional method is to put the film which has recorded the speckle patterns before and after displacement into a system of optical Fourier transforms. After filtering on the spectrum plane, the experimentalist can obtain the displacement information from the interference pattern on the image plane. Instead of setting up a complex optical Fourier transform system, we consider the speckle field as a light intensity function of 2 dimensions, which will change with different positioning of the points. After working on the function's discrete Fourier transform (DFT), according to one of the properties of Fourier transformation, the displacement of the measured point is involved in the phase of its spectrum. Having extracted the displacement information from the phase, we obtain the distribution of the displacement field. In this paper, we deduce the expression for the displacement field by using Fourier transformation under conditions of both equal and unequal displacement and show their applications.  相似文献   

16.
We report a combined experimental and theoretical investigation of the influence of spatial non-uniformities of the refractive index on the accuracy of laser Doppler anemometry (LDA) measurements in transparent fluids. One LDA beam is guided through heated air of a thermal boundary layer near a heated vertical flat plate. It is found that the hot air is deflecting the beam because of a modification of the refractive index n in the fluid. This deflection causes three effects: (1) spatial displacement of beam intersection, (2) waist mismatch in the measurement volume and (3) variation in interference fringe distance. With the help of a rotating disk calibration system the resulting displacement of the LDA measurement volume and the Doppler frequency variation is systematically studied at different temperatures. Using a simple model of beam propagation under the influence of well-defined temperature inhomogeneities, the displacement of measurement volume and change in Doppler frequency are calculated and are found to be in agreement with the experimental observations. The results provide a rational framework for an assessment of the accuracy of LDA data in arbitrary transparent fluids with non-uniform refractive index.  相似文献   

17.
The application of phase-Doppler anemometer for scattering angles between the main rainbow and direct backscatter, was examined by calculating the spatial intensity distribution and the phase of the light scattered by a particle crossing the measuring volume. Geometrical optics was assumed and contributions to the scattered light due to reflection on the external surface of the particle and first internal reflection were considered. The response curve of the technique was calculated for different particle refractive indices, beam intersection angles, collection angles and spacings between the collection apertures. Linear response curves were obtained after integration of the intensity of the scattered light over sufficiently large rectangular collection apertures, but they became non-monotonic after a critical value of phase shift, which varied with the optical arrangement between around 220° and 360°, did not scale with common scaling parameters used for forward scatter light, and limited the possible size range of the instrument for one optical arrangement. The particle refractive index determined the collection angle and limited sizing to particles with little uncertainty in refractive index, since a 5% change in refractive index led to uncertainties in size of the order of 100%. An alternative sizing technique is suggested for the backscatter region.  相似文献   

18.
毛细力诱发的粘附现象在自然界和工农业生产中广泛存在,例如微机电系统、微纳米自组装、油气驱替等.本文系统研究了两根微梁的毛细粘附行为,包括梁剥离过程中液桥的形貌以及剥离力-位移变化规律.试验发现,微梁在毛细力作用下的剥离部分经历了液膜粘附和液滴粘附两个阶段.考虑两个阶段的液桥形状特征,分别建立系统的能量泛函,采用变分原理推导了考虑毛细力的微梁剥离的非线性微分方程和边界条件.基于Matlab 编程求解方程,得到了剥离力-位移曲线,理论计算与试验结果具有很好的一致性.另外,参数研究表明,接触角和表面张力系数对液膜粘附的微梁剥离影响显著,而对液滴粘附的剥离影响较小;微梁刚度对两个阶段的剥离都有明显影响.本文的试验结果和理论分析对于实际工程中微结构的定量设计具有一定参考价值.  相似文献   

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