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基于FBG磁场传感方案的研究 总被引:1,自引:0,他引:1
光纤Bragg光栅(FBG)传感技术较其它光纤传感技术有独特的优点,因此更具有研究的价值.本文基于光纤Bragg光栅的应变敏感性和磁性材料的磁致伸缩效应,提出了将光纤Bragg光栅应用于磁场传感测量的方案,并论证了其可行性. 相似文献
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光纤Bragg光栅与长周期光纤光栅比较及传感应用 总被引:2,自引:0,他引:2
阐述了光纤Bragg光栅(FBG)与长周期光纤光栅(LPFG)的常用制作方法、原理、特性,并对它们进行了比较,介绍了目前国内外光纤光栅的最新应用,特别是在传感领域的新应用。对今后的研究方向做了预测,适合于不同用途光纤光栅的写入技术有待于进一步提高,通过减小包层直径来改变光纤光栅特性的方法有待于进一步研究和利用,在折射率传感领域光纤光栅会有更广阔的天地。 相似文献
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为了满足机器人与外界环境、对象发生接触及交互作用时的触觉感知需求,提出了一种基于光纤布拉格光栅(FBG)的柔性触觉传感器.该传感器采用3×3 FBG阵列作为柔性传感元件,聚二甲基硅氧烷(PDMS)材料构成双层柔性基体.介绍了传感器的传感原理并采用有限元方法对其弹性体进行力学仿真分析,基于标定实验平台完成该传感器的静态标定实验.传感器的空间分辨率为25mm,在10mm×10mm载荷施加单元下,对力的感知范围为0~7N,且传感器具有较好的线性度和灵敏度,重复性和一致性良好,力灵敏度为0.16nm/N.实验结果和分析研究都证明了柔性触觉传感器的可行性.该传感器与人体皮肤触感及结构极为相似,且布线简单、抗干扰能力强. 相似文献
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光纤生化传感器因具有不受电磁干扰、绝缘性好、安全防爆、损耗低和耐腐蚀等优点,在人体健康防护领 域表现出了良好的应用价值:及时且有效地监测污染物可为环境污染物的有效控制提供数据支撑,从源头上减少疾病的发生;准确且灵敏地检测疾病标志物可诊断人体疾病的情况,从而使得疾病的预防和早期治疗成为可能.对应用于人体健康防护中的光纤生化传感器进行全方位地概述:首先,介绍其使用的光纤传感原理;然后,总结并分析应用于气体和水质污染物监测的光纤生化传感技术;接着,总结并分析应用于人体呼出气体和生物体液检测的光纤生化传感技术;最后,讨论光纤生化传感器在人体健康防护领域实际应用的一些限制因素以及未来的发展方向. 相似文献
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通过对光纤传感器进行设计,提出了一种基于变宽度悬臂梁的光纤(Bragg)光栅(FBG)流速传感器.传感部分由不锈钢材质的悬臂梁和粘贴在其特定位置上的FBG构成,悬臂梁采用等腰梯形和矩形相结合的外形结构设计,传感头两部分之间的衔接不需要用销子固定,整个传感头浑然一体,无额外附加重量,制作方法简易,且实验设置参考光栅,实验结果不受温度变化的影响.实验表明:传感器的Bragg波长漂移量与流速变化有很好的线性关系,传感器的灵敏度为0.025 m/s.可测流速范围为0~2 m/s,传感器不仅实现了对温度的补偿,而且提高了测量精度、灵敏度. 相似文献
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触觉是机器人感知外部环境的重要信息来源。近10年来,随着触觉感知技术和交互技术的广泛应用,机器人触觉传感技术得到了机器人研发人员的高度关注。首先简要回顾了近50年来机器人触觉传感器技术研究的发展情况,特别是我国在机器人触觉传感器技术领域的研究历程;然后,对现有机器人触觉传感技术进行了分类总结;接着,对当前触觉传感技术研发的前沿即电子触觉皮肤的研究做了分析和阐述,指出了机器人触觉传感技术研发亟待解决的关键问题,并对未来的发展趋势提出了一些见解。 相似文献
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光纤传感技术是近年来测量领域的热点之一。由于测量环境的恶劣和限制,使得在某些工业环境中,光纤传感技术的抗电磁干扰、耐腐蚀、防燃防爆等优势得以发挥,得到广泛的应用。本文研究了光纤温度传感的原理,并介绍了一种新型的光纤高温传感器。 相似文献
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G. ScandurraAuthor VitaeA. ArenaAuthor Vitae C. CiofiAuthor VitaeA. GambadoroAuthor Vitae F. BarrecaAuthor VitaeG. SaittaAuthor Vitae G. NeriAuthor Vitae 《Sensors and actuators. B, Chemical》2011,157(2):473-481
Transparency sheets, coated with copper on both sides by means of thermal evaporation in vacuum, are patterned by direct chemical etching to realize sensing platforms having copper heaters on the backside, and resistances having calibrated temperature coefficient on the topside. The mechanical and thermal stability of these structures was demonstrated up to 70 °C. Bending tests also show that the metallic patterns do maintain unaltered performances after more than 104 bending cycles. Resistance measurements show that the resistance on the patterned copper structures linearly increases with the temperature in the range between room temperature and 70 °C, while above this temperature an irreversible damage occurs. Experimental investigations demonstrate that the heaters on the backside of the sensing platforms allow to obtain a quite uniform temperature distribution on the top side over an area larger than 1 cm2.Coating the flexible sensing platform by doped polyaniline and carbon nanotubes embedded in a polymer host, a chemoresistive system operating at low temperature is developed, which allows to perform tests at constant temperature, with the temperature being set and monitored by using the heater and the patterned resistance, respectively. The sensing performances of the films are evaluated by means of electrical measurements performed while exposing the samples to different relative humidity levels, and to calibrate ammonia pulses. 相似文献
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汽车用氧传感器de研究与进展 总被引:2,自引:1,他引:1
汽车尾气中的有害物主要有CO、HC、NOx、SOx以及一些微粒物质,给人类赖以生存的大气环境带来了严重的危害.用氧传感器对汽车发动机的空燃比进行调节,控制发动机中的燃烧过程,可以达到减少污染和节约能源的双重目的.目前适用于汽车空燃比控制的传感器主要有三种:氧化物半导体型(TiO2传感器)、浓差电池型(ZrO2氧传感器)、极限电流型.本文在介绍了这三种汽车用氧传感器的原理、结构的基础上,重点介绍了一种新型极限电流型氧传感器一致密扩散障碍层极限电流型氧传感器,并简要分析了其发展趋势. 相似文献
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For many applications, the detection of water content in an oily base liquid is of crucial importance. Typical examples are automotive oils, e.g. engine and transmission oils, where water content in the order of a few percent needs to be detected. In this contribution, we analyze the suitability of permittivity and viscosity sensors for this application. It turns out, that permittivity sensors yield a clear indication of the water content in the oil being moreover to first order independent of the exact permittivity of the contaminating water. On the other hand, the output of microacoustic viscosity sensors, in contrast to conventional rotational rheometers, is hardly influenced by the water content as long as the droplet size is larger than the penetration depth of the evanescent microacoustic wave. Thus, they can be used for continued monitoring of the base oil’s viscosity even in case of an apparent water contamination. 相似文献
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LaFEO3 and CaxLa1−xFeO3 ceramic powders have been prepared by the coprecipitation method from La(NO3)3, Fe(NO3)3 and Ca(NO3)2 aqueous solutions. The orthorhombic perovskite phases of LaFeO3 and CaxLa1−xFeO3 are characterized by X-ray diffraction patterns. The sensors fabricated with those powders have high sensitivity to alcohol. Partial substitution of La3+ in LaFeO3 with Ca2+ can enhance the sensitivity of the materials to reducing gases. The resistance of an LaFeO3 sensor in air, vacuum and alcohol-containing air has been measured. Complex impedance spectroscopy has been used to try and analyse the gas-sensing mechanism. According to the experimental results, it can be deduced that the surface adsorptive and lattice oxygen govern the sensing properties of LaFeO3 and CaxLa1−xFeO3 ceramics. 相似文献
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《Sensors and actuators. A, Physical》1995,50(3):183-186
High thermoelectric power (S300 μV K−1;ρ10−4 Ω m) has been achieved for germanium layers doped with gold deposited by evaporation. The relative simplicity and good reproducibility of the method seems to be promising for thermopiles in some types of microsensors. 相似文献
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CMOS fully digital integrated pressure sensors 总被引:2,自引:0,他引:2
M. -T. Chau D. Dominguez B. Bonvalot J. Suski 《Sensors and actuators. A, Physical》1997,60(1-3):86-89
Most commercially available silicon pressure transducers are based on a Wheatstone bridge configuration and given an analogue output signal. These devices are generally very sensitive to noise and require complicated circuits (by using passive components) for temperature and non-linearity compensation. This limits the transducer accuracy and increases the calibration cost. To overcome these problems, a new generation of pressure transducers with digital output, based on MOSFET ring oscillators, has been developed. A fully digital integrated pressure sensor and data-acquisition procedures will be presented. 相似文献