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干涉技术在光纤传感器设计中的应用 总被引:6,自引:0,他引:6
介绍了干涉型光纤传感器的基本原理,结合实例阐述了各种干涉型光纤传感器的设计方法与实现技术,讨论了光纤传感器所用光源的选择,举例说明了干涉仪在大规模、长距离传感系统中的应用方法,并展望了这类光纤传感器的发展前景。 相似文献
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《中国激光》2016,(9)
干涉型光纤传感器是一种高灵敏度的传感器,在许多领域都具有重要应用价值,而偏振衰落是这种传感器中需要解决的一个重要问题。提出采用脉冲正交偏振切换及基于相位生成载波(PGC)的信号合成算法来实现抗偏振衰落。阐述了正交偏振切换方法的基本理论,分析了以PGC解调为基础的正交偏振切换合成算法的原理,搭建了实验系统进行实验研究。结果表明,当光纤中偏振态受到扰动时,通过正交偏振切换及合成算法,合成的结果等效干涉度可以稳定在0.93~0.94之间;解调结果的噪声可以达到四路偏振通道噪声的最低水平。该方法可以消除传输光纤中偏振扰动所造成的低频相位漂移,使解调结果不受传输光纤中偏振态扰动的影响。长时间的噪声监测结果表明,PGC调制频率为8kHz时,系统噪声达到了-96dB/槡Hz(1kHz),与同一系统中采用法拉第旋镜作为反射镜测得的本底噪声相当。该方法为解决干涉型光纤传感器时分复用阵列,特别是基于光纤光栅的干涉型准分布式光纤传感器和分布式传感系统中的偏振衰落问题提供了一种可行的途径。 相似文献
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声发射光纤检测方法的研究 总被引:2,自引:0,他引:2
给出了Michelson干涉式光纤声发射(AE)传感器、Fabery-Perot干涉式光纤(AE)传感器、Mach-Zehnder干涉式光纤AE传感器、Sagnac干涉式光纤声发射传感器的检测原理。同时给出基于以上干涉式光纤声发射传感器的检测技术在一些领域的应用。最后给出声发射光纤检测技术不足及其发展趋势。 相似文献
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椭圆芯型多模光纤多模光纤在干涉传感器、参考信号传输系统和非线性光学装置的应用前景决定了对其偏振性质研究的迫切性。对短轴对称多模光纤的研究表明[1],它们拥有低双折射(~10-6)。多模光纤导光芯型低双折射的存在能沿它们传输线偏振辐射,其偏振面与多模光... 相似文献
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基于光子晶体光纤环镜的光纤传感器的研究及进展 总被引:3,自引:3,他引:0
对国内外已报道的基于光子晶体光纤环镜的光纤传感器进行了综述。总结了多种基于光子晶体光纤环镜的光纤传感器,包括应力、温度、微弯、扭曲和气压传感器。介绍了各种传感器的原理和优势,并对基于光子晶体光纤环镜的光纤传感器的发展进行了展望。 相似文献
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A large class of sensors has nonlinear input-output characteristics; the task of addressing their dynamic behavior is very interesting. These sensors include magnetic field sensors (fluxgate sensors), SQUID devices, ferroelectric sensors, and mechanical sensors made of piezoelectric materials. Over the past few years there has been increasing interest in the sensing properties of ferroelectric devices based on piezoelectric, dielectric, and conduction phenomena. The principal types of sensors are infrared sensors, pressure sensors, force and motion sensors, flow sensors, hydrophones, ultrasonic transducers for medical imaging, and material testing and temperature sensors. Several application fields are automotive, aerospace, communications, and environmental monitoring. Nonvolatile random access memories are another field of application. A conceptual understanding of switching dynamics for these devices is of scientific and technological interest and requires experiments to observe their static and dynamic behavior and to develop suitable models. In the field of measurement devices, for example, the design of sensors and actuators requires the use of efficient models. This emphasizes the need for both models and user friendly experimental setup allowing for the characterization of such classes of devices. Following sections describe the behavior of a ferroelectric device and an innovative analytical model aimed to predict its dynamics. 相似文献
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与传统的硅阻型压力传感器、陶瓷型压力传感器相比,石墨烯压力传感器具有测量灵敏度更高、测量范围更广的优点。对几种石墨烯压力传感器的研究进展进行综述。根据制作工艺的不同,将石墨烯压力传感器分为单层型和多层型。根据两大类型,列举最近六种石墨烯压力传感器的基本制作过程和测量范围、检测灵敏度等特性。根据六种石墨烯压力传感器的对比结果,得到单层型与多层型石墨烯压力传感器的不同工作特性及应用环境。针对单层型和多层型石墨烯传感器,分别提出提高性能的可行方案,对此类传感器的实际应用与推广具有一定的指导意义。 相似文献
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This paper reviews the work carried out in the recent years on sensors which exploit optical fibre nanotapers (OFN). After a brief introduction on the morphology, fabrication and properties of OFN, this paper will review the various OFN sensors. This type of sensors are extremely compact and relatively robust, are usually unperturbed by electromagnetic interference and can be interrogated remotely. In this review sensors will be grouped in three categories according to their morphology: linear sensors, resonant sensors and tip sensors. While linear and resonant sensors exploit the fraction of power propagating in the evanescent field (outside the nanotaper physical boundary), tip sensors exploit light confined within the nanotaper to excite/detect variations within a very limited area. 相似文献
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Recently developed micro- and nano-structured optical fiber sensors, with particular reference to surface plasmon resonance (SPR) fiber sensors and photonic crystal fiber (PCF) sensors are reviewed. SPR fiber sensors can have diverse structures such as D-shape, cladding-off, fiber tip or tapered fiber structures. Some of the recently developed novel structures include the use of various types of fiber gratings in SPR fiber sensors. PCF sensors cover diverse recent developments on photonic-bandgap fiber, holey fiber, hole-assisted fiber and Bragg fiber sensors. Major applications of these include gas sensors and bio-sensors. These micro- and nano-structured fiber sensors have attracted considerable research and development interest, because of their distinct advantages, which include high sensitivity, small sensor head footprint and the flexibility of the optical fibers. They are also of academic interest, and many novel ideas are continuously developed. 相似文献
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Hybrid Sensor Calibration Scheme for Mobile Crowdsensing–Based City‐Scale Environmental Measurements
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In this paper, we propose a hybrid sensor calibration scheme for mobile crowdsensing applications. As the number of newly produced mobile devices containing embedded sensors continues to rise, the potential to use mobile devices as a sensor data source increases. However, because mobile device sensors are generally of a lower performance and cost than dedicated sensors, sensor calibration is crucial. To enable more accurate measurements of natural phenomena through the use of mobile device sensors, we propose a hybrid sensor calibration scheme for such sensors; the scheme makes use of mobile device sensors and existing sensing infrastructure, such as weather stations, to obtain dense data. Simulation results show that the proposed scheme supports low mean square errors. As a practical application of our proposed scheme, we built a temperature map of a city using six mobile phone sensors and six reference sensors. Thanks to the mobility of the sensors and the proposed scheme, our map presents more detailed information than infrastructure‐based measurements. 相似文献
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简述了传感器在臭氧技术产品中的应用。对臭氧技术产品中使用最多的温度传感器、光传感器和红外遥控技术的工作原理进行了详述。进一步对应用于臭氧技术产品中的传感器进行了分类,并对压力式温度传感器、热敏传感器、双金属热保护器、热聚合开关、光敏二极管和红外遥控技术的工作原理、使用场所进行了逐一介绍。设计了几个使用这些传感器来对臭氧产品进行控制的控制电路。 相似文献
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Spivak A. Belenky A. Fish A. Yadid-Pecht O. 《Electron Devices, IEEE Transactions on》2009,56(11):2446-2461
A large variety of solutions for widening the dynamic range (DR) of CMOS image sensors has been proposed throughout the years. We propose a set of criteria upon which an effective comparative analysis of the performance of wide-DR (WDR) sensors can be done. Sensors for WDR are divided into seven categories: 1) companding sensors; 2) multimode sensors; 3) clipping sensors; 4) frequency-based sensors; 5) time-to-saturation (time-to-first spike) sensors; 6) global-control-over-the-integration-time sensors; and 7) autonomous-control-over-the-integration-time sensors. The comparative analysis for each category is based upon the quantitative assessments of the following parameters: signal-to-noise ratio, DR extension, noise floor, minimal transistor count, and sensitivity. These parameters are assessed using consistent assumptions and definitions, which are common to all WDR sensor categories. The advantages and disadvantages of each category in the sense of power consumption and data rate are discussed qualitatively. The influence of technology advancements on the proposed set of criteria is discussed as well. 相似文献