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关键词： 交通安全设施   交通标志   物联网技术   信息集成   传感器技术  

摘要： 道路交通标志利用颜色、形状、字符、图形向交通参与者传递信息,但是目前的交通标志牌显示信息单一,信息不能及时变换、更新,从而带来交通隐患。基于物联网技术的智能交通标志,利用气象感应器及无线传输的方式,可将多种警告标志通过LED点阵的合理布设,合并在同一块标志板上,并利用感应器采集的信息,通过Zigbee无线模块通讯传输到控制标志牌的单片机系统,经过接收分析后,控制标志牌上相应LED点阵图形,在同一块标志牌上及时变换警示、提醒、限制等信息。实现多种道路信息集成化以及道路信息的智能化。

关键词： Multispectral imaging   Amorphous silicon   Photonics   Optical sensing   Material recognition   Civil security applications  

摘要： In this paper we describe the development of four different amorphous silicon based pi(x)n multispectral photodetectors and discuss their optical characteristics as a result of extensive bandgap engineering. Upcoming from a sensor structure providing narrow band absorption peaks between 450 nm and 540 nm with a maximum applied bias of -12 V, we developed bias optimized detectors with increased bandwidth by changing the composition and thickness of the absorbing material. By applying just -2.5 V, one sensor obtains almost a Gaussian spectral response with peaks ranging from 420 nm to 580 nm. We present a specific algorithm to simulate color recognition probabilities for 20 different whitish powders by using two similar detectors. For the sensor providing sensitivity maxima reaching from 450 nm to 600 nm with sampling peaks in the range between 400 nm and 670 nm, the simulation discloses enhanced recognition probabilities of more than 70.2%, requiring a readout time of at least 15.5 ms. As assumed, the competetive sensor structure providing just a sampling bandwidth between 420 nm and 630 nm achieves recognition probabilities of 62.5% with a reduced readout time of only 6.1 ms. Possible sensor applications may exist in fields of fluorescence and spectrophotometric measurements, in chemical analysis, medical diagnostics or in colorimetric and multispectral imagery. (C) 2014 Elsevier B.V. All rights reserved.

关键词： X-ray detectors   Hybrid detectors   Inspection with x-rays  

摘要： Silicon sensor technologies with reduced dead area at the sensor's perimeter are under development at a number of institutes. Several fabrication methods for sensors which are sensitive close to the physical edge of the device are under investigation utilising techniques such as active-edges, passivated edges and current-terminating rings. Such technologies offer the goal of a seamlessly tiled detection surface with minimum dead space between the individual modules. In order to quantify the performance of different geometries and different bulk and implant types, characterisation of several sensors fabricated using active-edge technology were performed at the B 16 beam line of the Diamond Light Source. The sensors were fabricated by VTT and bump-bonded to Timepix ROICs. They were 100 and 200 mu m thick sensors, with the last pixel-to-edge distance of either 50 or 100 mu m. The sensors were fabricated as either n-on-n or n-on-p type devices. Using 15 keV monochromatic X-rays with a beam spot of 2.5 mu m, the performance at the outer edge and corners pixels of the sensors was evaluated at three bias voltages. The results indicate a significant change in the charge collection properties between the edge and 5th (up to 275 mu m) from edge pixel for the 200 mu m thick n-on-n sensor. The edge pixel performance of the 100 mu m thick n-on-p sensors is affected only for the last two pixels (up to 110 mu m) subject to biasing conditions. Imaging characteristics of all sensor types investigated are stable over time and the non-uniformities can be minimised by flat-field corrections. The results from the synchrotron tests combined with lab measurements are presented along with an explanation of the observed effects.

关键词： Pesticides   Biosensors   Acetylcholinesterase (AChE)   Oragnophosphate (OP)   Aptamers   Transducers  

摘要： Pesticides, due to their lucrative outcomes, are majorly implicated in agricultural fields for crop production enhancement. Due to their pest removal properties, pesticides of various classes have been designed to persist in the environment over a longer duration after their application to achieve maximum effectiveness. Apart from their recalcitrant structure and agricultural benefits, pesticides also impose acute toxicological effects onto the other various life forms. Their accumulation in the living system may prove to be detrimental if established in higher concentrations. Thus, their prompt and accurate analysis is a crucial matter of concern. Conventional techniques like chromatographic techniques (HPLC, GC, etc.) used for pesticides detection are associated with various limitations like stumpy sensitivity and efficiency, time consumption, laboriousity, requirement of expensive equipments and highly trained technicians, and many more. So there is a need to recruit the methods which can detect these neurotoxic compounds sensitively, selectively, rapidly, and easily in the field. Present work is a brief review of the pesticide effects, their current usage scenario, permissible limits in various food stuffs and 21st century advancements of biosensor technology for pesticide detection. Due to their exceptional performance capabilities, easiness in operation and on-site working, numerous biosensors have been developed for bio-monitoring of various environmental samples for pesticide evaluation immensely throughout the globe. Till date, based on sensing element (enzyme based, antibody based, etc.) and type of detection method used (Electrochemical, optical, and piezoelectric, etc.), a number of biosensors have been developed for pesticide detection. In present communication, authors have summarized 21st century's approaches of biosensor technology for pesticide detection such as enzyme-based biosensors, immunosensors, aptamers, molecularly imprinted polymers, and bi

关键词： MEMS sensor technologies   human centred applications   research activity in Italy   healthcare   rehabilitation   physical activities   sport science   safety   environmental sensing  

摘要： Over the past few decades the increased level of public awareness concerning healthcare, physical activities, safety and environmental sensing has created an emerging need for smart sensor technologies and monitoring devices able to sense, classify, and provide feedbacks to users' health status and physical activities, as well as to evaluate environmental and safety conditions in a pervasive, accurate and reliable fashion. Monitoring and precisely quantifying users' physical activity with inertial measurement unit-based devices, for instance, has also proven to be important in health management of patients affected by chronic diseases, e.g., Parkinson's disease, many of which are becoming highly prevalent in Italy and in the Western world. This review paper will focus on MEMS sensor technologies developed in Italy in the last three years describing research achievements for healthcare and physical activity, safety and environmental sensing, in addition to smart systems integration. Innovative and smart integrated solutions for sensing devices, pursued and implemented in Italian research centres, will be highlighted, together with specific applications of such technologies. Finally, the paper will depict the future perspective of sensor technologies and corresponding exploitation opportunities, again with a specific focus on Italy.

关键词： 传感器   微机电系统   检测技术   农业  

摘要： 简要介绍了传感器的概念及技术特点,并举例阐述了在农业生产中各关键环节对传感器技术的需求和应用现状,同时分析预测了未来农业领域中传感器技术的发展趋势,认为微机电系统(MEMS)微传感器、光电传感器、仿生传感器、无线网络传感器等新型传感器及新兴检测技术将成为未来农业传感器技术的主流发展方向。

关键词： 红外传感器   夜视功能   石墨   信息技术   传感器技术   高新技术   航空航天   可替代  

摘要： 随着现在信息技术的革新与更迭换代越来越快，更多的高新技术与新兴事物在我们的周围拔地而起，红外传感器技术作为近年来发展最快的技术之一，目前己广泛应用于航空航天、天文、气象、军事、工业和民用等众多领域，起着不可替代的重要作用。

关键词： 传感器技术   监测系统   光谱偏移   光纤布喇格光栅  

摘要： 基于新型微结构光纤,采用光纤环形激光器,设计了一个新型超声波传感监测系统。进行了理论分析和实验验证,取得了超声波导致光纤布喇格光栅的相对光谱偏移数据,从激光强度变化对冷腔损耗调制的响应进行检测。

关键词： 微机械   传感器技术   应用与展望  

摘要： 微机械惯性传感器的发展已有20多年,微机械惯性传感器应用于各个行业,进而也促进了各行各业的发展,在社会科技快速发展以来,应对微机械惯性传感器技术进行不断的改进,这样才能赶上西方发达国家的水平,对微机械惯性传感器的发展以及诸多行业的发展有着深远的影响。

关键词： Stiction  

摘要： In this paper, the existing Hertz-Mindlin model is modified and an improved tangential force model is introduced. Since the maximum static friction force is larger than the sliding friction force, it is unreasonable to assume that the friction force remains the same no matter if particle sliding occurs. Therefore, the static friction coefficient during sliding process in Hertz-Mindlin model is reassigned in the improved model and the tangential friction force is depicted by piecewise functions. Besides, discrete element analysis and simulations are carried out in EDEM to prove the rationality of the improved theoretical model. From the simulation results, it can be seen that tangential force under the improved model shows an obvious change when particle sliding occurs while tangential force under the existing Hertz-Mindlin model remains unchanged during the whole loading process, which means the improved friction model can simulate the particle sliding a lot more reasonable than the existing Hertz-Mindlin model. Copyright © 2015 American Scientific Publishers All rights reserved.