共查询到19条相似文献,搜索用时 140 毫秒
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通过对该传感器温度检测原理和探头结构的分析,提出了光纤温敏探头的优化设计。应用微机化信号处理系统,使该传感器的温度分辨率及自动测控功能得到提高。 相似文献
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一种用于MEMS检测的无耦合六维力传感器的研制 总被引:2,自引:0,他引:2
提出了一种用于MEMS检测试验平台中力学量测量的无耦合六维力/力矩传感器的设计。对传感器的结构形式、测量原理作了介绍,进行了试验验证并给出了从8路输出电压到六维力/力矩的传递矩阵。该传感器通过采用巧妙的结构形式和特定的电阻应变片布片方案实现了六维力解耦,大大简化了后置信号处理电路的设计且在各轴都具有较好的测量分辨率。实验证明,该传感器具有无耦合、测量分辨率高、线性度好、标定简单、贴片方便、制造成本低的优点,满足了预计的设计要求。 相似文献
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高性能低成本电子秤的参考设计 总被引:1,自引:0,他引:1
ColmSlattery MariahNie 《世界电子元器件》2006,(5):59-61,64
引言
电子秤向提高精度和降低成本方向发展的趋势引起了对低成本、高性能模拟信号处理器件需求的增加.大多数电子秤是以1:3,000或1:10,000的分辨率输出最终的称重值,使用12bit~14bit的模数转换器很容易慢足要求.然而,高精密检测的电子秤表明要达到这种分辨率,ADC的精度需要接近于20 bit.本文将讨论一些电子秤系统的技术指标以及设计和构建一个电子秤系统所需考虑的问题.设计中主要考虑峰峰值(PP)噪声分辨率、ADC的动态范围、增益漂移和滤波.我们使用作为评估板的电子秤参考设计,将来自实际称重传感器(又称作负荷传感器)的测量结果与来自稳定参考电压源的输入进行对比. 相似文献
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同步脑电-功能磁共振(EEG-fMRI)整合了脑电的高时间分辨率和功能磁共振的高空间分辨率,是无创的大脑观测技术。但目前,该技术仍然存在信噪比过低、受试者舒适性差和数据融合困难等问题。本综述在介绍同步EEG-fMRI硬件系统的基础上,从EEG伪迹去除、同步EEG-fMRI信号融合、同步EEG-fMRI的应用、未来研究前景四个方面,综述该领域的最新进展,特别是在信号处理方面的新突破。本文介绍了一个对强磁场环境下脑电的信号处理的技术分级框架,为此新技术的应用分流和推广提供了重要参考。 相似文献
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匹配光栅解调的传感器 总被引:1,自引:0,他引:1
介绍了匹配光纤布拉格光栅解调的基本原理,对采用此解调方法的传感器系统的参数进行了测试,并对系统进行定标。通过改进电路设计,检测极值点附近的对称点,提高了检测的精度。估算了系统的分辨率,温度分辨率为0.25℃,应变分辨率为2.07με。该系统具有结构简单、成本低、抗干扰能力强等特点。 相似文献
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A research on passive optical fiber current sensor based on magneto-optical crystal and a new design of light path of the sensor head are presented. Both methods of dual-channel optical detection of the polarization state of the output light and signal processing are proposed. Signal processing can obtain the linear output of the current measurement of the wire more conveniently. Theoretical analysis on the magnetooptical fiber current sensor is given, followed by experiments. After that, further analysis is made according to the results, which leads to clarifying the exiting problems and their placements. 相似文献
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King J. Smith D. Richards K. Timson P. Epworth R. Wright S. 《Lightwave Technology, Journal of》1987,5(4):616-624
Optical time domain reflectometry (OTDR) is a commonly used technique for characterization and fault location of optical fiber transmission systems. It involves measuring the fraction of a probe pulse that is scattered back (by Rayleigh scattering) from a silica fiber. Because of the very small levels of backscatter in single-mode fiber at long wavelengths, very sensitive optical detection is necessary to achieve adequate range performance. This paper gives the principles of operation and performance of a coherent OTDR system designed for use at 1.3 μm and its realization as a robust field-portable instrument with a specified performance of better than 24-dB one-way range, and 0.2-dB fault loss resolution. Coherent detection gives ultimate receiver sensitivity and also reduces the dynamic range requirements of the electronic signal processing. To realize these advantages, a novel technique is used to provide the necessary highly coherent source from a semiconductor laser. Sophisticated Signal processing techniques are employed both pre- and post-detection to integrate the signal out of the noise and also to reduce coherent fading effects. The various components of the system and their development into a robust instrument are described, and the performance of the system over long lengths of fiber both in the laboratory and more importantly on installed transmission links is presented in detail, showing achieved performance considerably better than this specified minimum. 相似文献
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设计了一种以单片机和光纤传感器为基础构成的表面粗糙度测量系统。该系统由光纤传感器、信号检测电路、单片机处理电路和显示装置组成。其特点是系统性能稳定、适应性强、精度高,可以对不同加工方法的工件实现非接触和在线测量。重点给出了该系统的主要硬件和软件及实现方法。 相似文献
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The development and performance of a high-temperature optical fiber point sensor based on fluorescence decay time of a chromium-doped material are reported. The device exploits a novel digital signal processing scheme for decay time measurement. It is based on a modified phase-sensitive-detection technique with the phase locked to a fixed value and the modulation frequency tracking the measured decay time. The sensor was calibrated in the temperature range from -25 to 500°C with a 0.1°C resolution. Remarkable features are the system immunity to fluorescent intensity losses and the long-term stability, showing a maximum drift of 0.3°C over more than 600 h 相似文献
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各种蒸发光学薄膜都存在内应力,其性质和大小直接影响光学薄膜性能与质量。因此,薄膜内应力的精确检测具有重大的实用意义。本文介绍以高灵敏度的光纤传感器为变换器,以高分辨率的 CCD 为光信号检测器的内应力检测系统,具有灵活、结构小巧、精度高、实时测量等优点,实践证明是有效的。 相似文献
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针对基于SPR效应的两类典型光纤型传感器:传统型包层腐蚀的镀金属多模光纤传感器、新型镀金属单模光纤光栅传感器,指出其不同的SPR模型处理方法及传感特性。首先,根据传统型SPR光纤传感器的结构特点,利用平板SPR理论给出反射谱特性,同时指出并证明薄膜光学理论在平板SPR结构中与平板SPR理论的等价性。其次,针对新型SPR光纤光栅传感器结构特点,依据模式耦合思想,结合SPW模式特征,提出了光纤光栅SPR结构的理论处理方法,得到了镀金膜三包层LPFG结构的透射谱。最后,对基于SPR效应的两类典型光纤型传感器的传感特性进行了比较分析,结果表明,两类传感器对环境折射率均具有较高的分辨率,但新型光纤光栅SPR传感器的分辨率高出传统SPR光纤传感器3个数量级。 相似文献