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关键词： DNA修饰   传感器技术   相互作用   万艾可   电化学   生物   枸橼酸西地那非   电位测定法  

摘要： Rauf S等人利用电化学DNA生物传感器技术进行了有关枸橼酸西地那非(万艾可)与DNA之间相互作用的一项研究[Biosens Bioelectron,2007,22(11):2471-2477]。该研究采用DNA修饰的玻璃样炭电极以及恒流电位测定法和微脉冲伏安法加以测定。通过测定不同电位时枸橼酸西地那非(万艾可)与DNA的相互作用来阐明二者的结合机制,以鸟嘌呤氧化峰面积或蜂曲线的下降程度作为0.2M乙酰缓冲(pH5)体系中二者相互作用程度的指示。所得的恒流电位测定法和微脉冲伏安法的结合常数(K)分别为(2.01±0.05)×10^5和(1.97±0.01)×10^5M^-1。[第一段]

关键词： 光纤光学   传感器技术   光纤传感器   光纤光栅   可调谐FFP   振动  

摘要： 结合基于3×3耦合器的光纤Mach-Zehnder干涉仪和可调谐光纤Fabry-Perot滤波器(Fiber-Fabry-Perot,FFP),提出了一种分时复用光纤光栅振动传感器的技术.用FFP对串联在一根光纤上的光纤光栅的波长进行轮流扫描,让光栅的反射光按波长顺序依次通过FFP.而对于每一光纤光栅上外加的振动信号,用光纤Mach-Zehnder干涉仪进行测量.实际测量结果显示,FFP结合Mach-Zehnder能够对每一只光栅上的振动信号进行分时测量.

关键词： SCA103T   倾斜仪   水平仪   MSP430单片机  

摘要： 本文介绍了一种新型的数字倾角仪。把微机电系统(MEMS)技术的高精度倾角传感器和微处理器有机结合,借助智能算法,设计了一种高性能的倾角测量仪,缩小了仪器体积,提高了仪器精度和抗震性;研究结果表明:该数字倾角仪测量范围可达±15°,分辨力达到0.01°,可广泛应用于建筑、石油、煤矿和地质勘探等各种需要测量倾角的场合。

关键词： 技术发展趋势   数控技术   自动控制技术   机电一体化产品   机械制造技术   伺服驱动技术   数控装备   传感器技术  

摘要： 数控技术是用数字信息对机械运动和工作过程进行控制的技术，数控装备是以数控技术为代表的新技术对传统制造产业和新兴制造业的渗透形成的机电一体化产品，即所谓的数字化装备，其技术范围覆盖很多领域：（1）机械制造技术；（2）信息处理、加工、传输技术：（3）自动控制技术：（4）伺服驱动技术；（5）传感器技术：（6）软件技术等。

关键词： biosensor   telomerase   electrochemical detection   biocatalytic labels   TRAP assay  

摘要： Measuring telomerase activity has proven successful for the determination of cancer in malignant somatic cells. Early conventional methods for the detection of telomerase activity include in vitro analysis via a primer extension assay, and the telomeric repeat amplification protocol (TRAP) assay. TRAP incorporates the polymerase chain reaction (PCR) step to increase the sensitivity of a given sample. However, research suggests that the TRAP technique suffers from false negative results, caused by failure of its PCR step. Other limitations of TRAP include the post-PCR steps involving polyacrylamide gel electrophoresis which are time inefficient. Thus, various efforts have been made to eliminate the PCR step of TRAP by using a variety of biosensor detection devices. This review mainly focuses on these alternatives including: optical, electrochemical, magnetic, and nanowire conductive signaling techniques to measure the telomerase activity produced via label free biosensor assay-via biocatalytic labels involving beacons, DNAzyme, ferrocenyl-naphthalene diimides, avidin-alkaline phosphatase and semiconductor quantum dots (QDs). These biosensor techniques are sensitive and provide precise and rapid results in the detection of telomerase activity.

关键词： Fingerprint recognition   Quality measurement   Sensors   Sensor technology   Image quality  

摘要： Although many image quality measures have been proposed for fingerprints, few works have taken into account how differences among capture devices impact the image quality. Several representative measures for assessing the quality of fingerprint images are compared using an optical and a capacitive sensor. We implement and test a representative set of measures that rely on different fingerprint image features for quality assessment. The capability to discriminate between images of different quality and the relationship with the verification performance are studied. For our verification experiments, we use minutiae- and ridge-based matchers, which are the most common approaches for fingerprint recognition. We report differences depending on the sensor, and interesting relationships between sensor technology and features used for quality assessment are also pointed out. (C) 2008 SPIE and IS&T.

关键词： LIGHT -- Wave-length   LIGHT sources   DETECTORS   PHOTONICS   WAVEGUIDES  

摘要： The article discusses advances and future strategies for miniaturizing mid-infrared (MIR) sensor technology. It considers each MIR sensing system comprising four main components such as light source, wave guides, wavelength selection device and detector. It then looks at future trends in mid-infrared sensors based on integrated photonics.

关键词： biomedical sensors   tissue engineering   noninvasive monitoring   engineered tissue  

摘要： Research in regenerative medicine has necessitated the need for advanced sensing technologies to monitor and evaluate the quality of engineered tissues. Several sensing schemes have been developed to sense specific analytes that enable researchers to assess tissue morphology, growth, and function. In addition to microscopy and staining techniques, tissue engineers are presented with an array of optical, chemical, and biological sensor technologies, which provide them with an opportunity to monitor variables, such as oxygen concentration, pH value, carbon dioxide, and glucose concentration in a noninvasive or minimally invasive manner. The article presents a short description on the core technologies and research reviews on the use of sensors employed in tissue engineering over the past decade. The article concludes by presenting some of the challenges to the further development of these technologies that are capable of real time measurement of tissue structure, composition, and function both for in-vitro and in-vivo analysis.

关键词： oil spill surveillance   disaster management   contingency planning   remote sensing   space-borne sensors   airborne sensors  

摘要： Reducing the risk of oil spill disasters is essential for protecting the environment and reducing economic losses. Oil spill surveillance constitutes an important component of oil spill disaster management. Advances in remote sensing technologies can help to identify parties potentially responsible for pollution and to identify minor spills before they cause widespread damage. Due to the large number of sensors currently available for oil spill surveillance, there is a need for a comprehensive overview and comparison of existing sensors. Specifically, this paper examines the characteristics and applications of different sensors. A better understanding of the strengths and weaknesses of oil spill surveillance sensors will improve the operational use of these sensors for oil spill response and contingency planning. Laser fluorosensors were found to be the best available sensor for oil spill detection since they not only detect and classify oil on all surfaces but also operate in either the day or night. For example, the Scanning Laser Environmental Airborne Fluorosensor (SLEAF) sensor was identified to be a valuable tool for oil spill surveillance. However, no single sensor was able to provide all information required for oil spill contingency planning. Hence, combinations of sensors are currently used for oil spill surveillance. Specifically, satellite sensors are used for preliminary oil spill assessment while airborne sensors are used for detailed oil spill analysis. While satellite remote sensing is not suitable for tactical oil spill planning it can provide a synoptic coverage of the affected area.

关键词： 光纤加速度传感器   Michelson干涉仪   积分效应   LabVIEW  

摘要： 目前利用光纤作为敏感元件可以用来测量位移、速度、加速度、压力、水声、温度、电场、磁场等各种物理量,具有极高的灵敏度、安全性、抗电磁干扰、绝缘性、质量轻、易于成阵,便于实现传感、传输的一体化合成等诸多优点,正在广泛的应用于现代测量领域。 光纤加速度传感器是其中重要的应用之一。结合目前国内外光纤加速度传感器的研究现状,以及在光纤加速度传感器实用化进程中遇到的问题,对光纤加速度传感器的结构、检测原理进行了理论分析与实验,对实验中出现的一些问题进行了研究并提出了相应的解决方案。 采用带法拉第旋转镜(FRM)的1310nm Michelson干涉仪作为测量机构,详细阐述了干涉型光纤加速度传感器的基本原理和零差检测技术,对基于DSP的光纤加速度传感器数字化检测系统中出现的“积分效应”问题进行了分析,并提出了解决方案,利用基于LabVIEW的数字化检测平台对方案的可行性进行了验证。在研究过程中,完成了以LabVIEW为核心的光纤加速度传感器数字化检测平台的构建,并利用网络技术添加了相应的网络功能,所设计的平台可以方便的完成光纤加速度传感器检测系统的实验,对于分析光纤加速度传感器的关键技术具有很大的帮助,对加快光纤加速度计传感器实用化进程起到了积极的作用。