单端SAW器件设计及有限元仿真

随着信息技术和通讯技术的发展,通讯设备中需要处理的信号频段和信号量也在不断增加。而声表面波(SAW)器件不仅具有优异的信号传感、信号延时以及信号滤波功能,还具有结构简单、尺寸小、成本低、适于大规模生产的优点,因此广泛应用于通讯设备。本文设计了一个单端SAW器件,并使用COMSOL Multiphysics软件对其进行有限元仿真分析,仿真发现,器件的反谐振频率为反谐振频率为190.79MHz,谐振频率为190.84MHz。     

边缘电场传感器建模及逆问题研究

边缘电场传感器是一种电容式传感器,由于具有单边穿透、信号强度可调及层析成像等优点,被广泛应用于工业过程控制中非接触测量。但是边缘电场不均匀分布,很难建立传感器解析模型,求解被测对象物理特性的逆问题难度很大。本文研究了交叉指电极边缘电场传感器连续建模方法,并在此基础上,利用广义特征值求解介电特性参数,仿真结果验证了算法的有效性。     

CMOS图像传感器发展趋势

本文介绍了CMOS图像传感器的概况,指出了CMOS图像传感器的发展趋势。结论:CMOS图像传感器具有美好的发展前途。     

智能传感器在中医学上的应用

智能传感器技术在中医学领域中有广阔的应用前景,它具有专一、灵敏、响应快等特点,本文简要介绍了智能传感器的原理,分析了智能传感器在中医上的应用优势及探讨了智能传感器在中医上的研究进展。     

关于Q345R钢板SAW焊接工艺认可试验的研究

本文通过论述Q345R钢板SAW焊接工艺认可试验过程,重点介绍船用钢质焊接压力容器的焊接工艺认可试验步骤及注意事项。     

生物传感器的进展综述

生物传感器技术在医学领域中有广阔的应用前景,它具有专一、灵敏、响应快等特点,本文简要介绍了生物传感器的工作原理、分类,探讨了生物传感器的研究进展及应用前景.     

生物传感器的进展综述

生物传感器技术在医学领域中有广阔的应用前景，它具有专一、灵敏、响应快等特点，本文简要介绍了生物传感器的工作原理、分类，探讨了生物传感器的研究进展及应用前景。     

超声波传感器及其应用

本文主要介绍了产生波技术和超声波传感器的构成并分析了超声波传感器在测距离、测流量、侧厚度及材料探伤等方面的应用。超声波具有频率高、波长短、方向性好、能够成为射线而定向传播等特点使得超声波在传感器方面得到了广泛的应用。具有一定的研究价值。     

自动生化仪液位传感器的创新设计

目前,国内使用的加样针液位传感器存在成本高、准确性低的缺点,不能满足精确加样的需求。因此,本文设计了一种基于C8051F330单片机的新型传感器,通过对传感器A/D数据分析,选择合适的判断阈值,能实现传感器对液位的精确判断。经大量实验证明,本文设计的传感器完全满足常规血检项目需求,检测精度高、性能稳定,具有较强的市场竞争力。     

一种基于剪枝YOLO的传感器识别方法

传感器的自动识别与配置对于智能物联网的构建具有重要意义。针对传感器识别,本文提出了一种基于YOLOv3网络的传感器识别方法,通过单一的前向神经网络,快速回归图片中传感器的种类、位置与数量信息,为传感器智能化配置与通讯建立基础,同时,对相关从业人员提供可靠的传感器型号或类别参考。本文提出的方法在保证准确率的条件下,有效提高了响应速度和部署可行性。     

Transportation of single cell and microbubbles by phase-shift introduced to standing leaky surface acoustic waves

A microfluidic device was developed to precisely transport a single cell or multiple microbubbles by introducing phase-shifts to a standing leaky surface acoustic wave (SLSAW). The device consists of a polydimethyl-siloxane (PDMS) microchannel and two phase-tunable interdigital transducers (IDTs) for the generation of the relative phase for the pair of surface acoustic waves (SAW) propagating along the opposite directions forming a standing wave. When the SAW contacts the fluid medium inside the microchannel, some of SAW energy is coupled to the fluid and the SAW becomes the leaky surface wave. By modulating the relative phase between two IDTs, the positions of pressure nodes of the SLSAW in the microchannel change linearly resulting in the transportation of a single cell or microbubbles. The results also reveal that there is a good linear relationship between the relative phase and the displacement of a single cell or microbubbles. Furthermore, the single cell and the microbubbles can be transported over a predetermined distance continuously until they reach the targeted locations. This technique has its distinct advantages, such as precise position-manipulation, simple to implement, miniature size, and noninvasive character, which may provide an effective method for the position-manipulation of a single cell and microbubbles in many biological and biomedical applications.     

Integrated microfluidics system using surface acoustic wave and electrowetting on dielectrics technology

This paper presents integrated microfluidic lab-on-a-chip technology combining surface acoustic wave (SAW) and electro-wetting on dielectric (EWOD). This combination has been designed to provide enhanced microfluidic functionality and the integrated devices have been fabricated using a single mask lithographic process. The integrated technology uses EWOD to guide and precisely position microdroplets which can then be actuated by SAW devices for particle concentration, acoustic streaming, mixing and ejection, as well as for sensing using a shear-horizontal wave SAW device. A SAW induced force has also been employed to enhance the EWOD droplet splitting function.     

红外上转换材料的检测传感器

通过设计一种用于检测纸币上红外上转换材料的光电传感器,研究这种光电传感器的工作原理、结构以及信号处理电路。该传感器具有体积小、抗干扰能力好等特点,对红外上转换材料在防伪技术上的应用提供了有力的检测手段,同时,这种传感器易于安装在自动点钞机上,有很好应用前景。     

SAW-driven droplet jetting technology in microfluidic: A review

The introduction of surface acoustic wave (SAW) technology on microfluidics has shown its powerfully controlling and actuating fluid and particle capability in a micro-nano scale, such as fluid mixing, fluid translation, microfluidic pumping, microfluidic rotational motor, microfluidic atomization, particle or cell concentration, droplet or cell sorting, reorientation of nano-objects, focusing and separation of particles, and droplet jetting. The SAW-driven droplet jetting technology enjoys the advantages of simple structure to fabricate with little hindrance, compact size to integrate with other components, high biocompatibility with biological cells or other molecule samples, large force in realizing fast fluidic actuation, and contact-free manipulation with fluid. The realization of this technology can effectively overcome some bottleneck problems in the current micro-injection technology, such as mechanical swear, complicated and bulky structure, and strict limitation of requirements on fluidic characteristics. This article reviews and reorganizes SAW-microfluidic jetting technology from decades of years, referring to the interaction mechanism theory of SAW and fluid, experimental methods of SAW-microfluidic jetting, effects of related parameters on objected pinch-off droplets, and applications of individual structures. Finally, we made a summary of the research results of the current literature and look forward and appraise where this discipline of SAW-microfluidic jetting could go in the future.     

一种分布式防盗报警系统的设计

本文提出了一种基于单片机信号处理的分布式防盗报警系统的软硬件设计方法,该系统包含有线式探测头和无线式探测头,探测头可以是基于热释电的主动式红外传感器或者是基于多普勒频移原理的微波雷达传感器。该系统具有检测范围大、组网方便灵活、灵敏度可调等优点,通过对软件算法的优化,使得系统具有较高的可靠性,且误报率低。     

Microfluidics based on ZnO/nanocrystalline diamond surface acoustic wave devices

Surface acoustic wave (SAW) devices with 64 μm wavelength were fabricated on a zinc oxide (ZnO) film deposited on top of an ultra-smooth nanocrystalline diamond (UNCD) layer. The smooth surface of the UNCD film allowed the growth of the ZnO film with excellent c-axis orientation and low surface roughness, suitable for SAW fabrication, and could restrain the wave from significantly dissipating into the substrate. The frequency response of the fabricated devices was characterized and a Rayleigh mode was observed at ∼65.4 MHz. This mode was utilised to demonstrate that the ZnO/UNCD SAW device can be successfully used for microfluidic applications. Streaming, pumping, and jetting using microdroplets of 0.5 and 20 μl were achieved and characterized under different powers applied to the SAW device, focusing more on the jetting behaviors induced by the ZnO SAW.     

Effect of surface acoustic waves on the viability, proliferation and differentiation of primary osteoblast-like cells

Surface acoustic waves (SAWs) have been used as a rapid and efficient technique for driving microparticles into a three-dimensional scaffold matrix, raising the possibility that SAW may be effective in seeding live cells into scaffolds, that is, if the cells were able to survive the infusion process. Primary osteoblast-like cells were used to specifically address this issue: To investigate the effects of SAW on the cells’ viability, proliferation, and differentiation. Fluorescence-labeled osteoblast-like cells were seeded into polycaprolactone scaffolds using the SAW method with a static method as a control. The cell distribution in the scaffold was assessed through image analysis. The cells were far more uniformly driven into the scaffold with the SAW method compared to the control, and the seeding process with SAW was also significantly faster: Cells were delivered into the scaffold in seconds compared to the hour-long process of static seeding. Over 80% of the osteoblast-like cells were found to be viable after being treated with SAW at 20 MHz for 10–30 s with an applied power of 380 mW over a wide range of cell suspension volumes (10–100 μℓ) and cell densities (1000–8000 cells∕μℓ). After determining the optimal cell seeding parameters, we further found that the treated cells offered the same functionality as untreated cells. Taken together, these results show that the SAW method has significant potential as a practical scaffold cell seeding method for tissue and orthopedic engineering.     

矿井自动监测预警系统的研究

本文提出基于无线传感器网络技术的煤矿安全监测系统,阐述了无线传感器网络体系设计及节点的硬件和软件设计,选择了基于IEEE802.15.4标准的ZigBee技术作为无线传感器网络的通信方案,充分利用无线传感器网络的优点,实现对井下各种环境及生产参数全方位、实时监测,尽可能地减少煤矿安全生产隐患,更好的为安全生产服务。     

光纤光栅传感技术及其应用研究

文章介绍了目前最先进的一种光纤传感器——光纤光栅传感器的性能、传感的原理及其应用,分析了光纤光栅传感技术应用中存在的缺陷及未来的研究方向     

无线传感器网络综述

无线传感器网络因其明显的性能优势和巨大的应用前景而受到学术界和工业界越来越广泛的重视。本文首先介绍了无线传感器网络的基本概念、特点,然后着重介绍无线传感器的研究现状,最后介绍它的研究热点和需要解决的问题。