共查询到18条相似文献,搜索用时 171 毫秒
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现有零件表面粗糙度测量大都是接触式测量,或者操作复杂,专业性强.针对这些问题,提出了利用光纤传感器实现表面粗糙度的现场非接触式测量.首先介绍了光纤位移传感器的工作原理,为了消除环境光和电源波动、噪声干扰对测试结果的影响,采用了双通道光纤传感器,介绍了双通道光纤传感器的原理,并设计了光纤传感器的尺寸和电路.最后对光纤传感器的性能进行了验证试验,试验结果证明该双通道光纤传感器用于测量零件的表面粗糙度是完全可行的. 相似文献
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噪声光源、测量距离、表面粗糙度等主要参数都极大地影响了光纤粗糙度传感器的测量精度,为此提出了采用延时发生器和取样保持放大器来减小噪声源影响的改进表面粗糙度光纤传感器,得出最佳采样时间间隔为0.6514s,最后通过Origin的曲线拟合求出近似方程,由方程得到粗糙度参数R_z. 相似文献
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针对现有零件表面粗糙度测量仪器专业性强、操作复杂、现场测量能力差的问题,基于单片机和光纤传感器设计了一套便携式的表面粗糙度测试仪;首先介绍了光纤位移传感器和测试仪的的工作原理,然后对便携式表面粗糙度测试系统的硬件电路和软件进行了分析设计;该系统为零件表面粗糙度的现场测量提供了新途径. 相似文献
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光纤表面等离体激元共振传感器是一种易于小型化的SPR传感器,常用于开发便携式传感检测设备,也可用于远距离实时在线检测.在本研究中,采用特制光纤作为导光介质来制作一种新的光纤SPR传感器.由于光纤中光传播相当复杂.仅凭过往经验来设计传感器将不能保证其检测精度.因此,针对本研究中光纤的特点,建立了光纤中光传播模型,并结合菲涅耳公式推导出该类光纤SPR传感器中光总反射系数与光波长的关系,最终绘制出理论SPR曲线并计算出共振波长.研究结果为该类光纤SPR传感器的设计及光谱分析提供了重要理论依据. 相似文献
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非接触式微位移光纤传感器 总被引:1,自引:0,他引:1
本文描述了用于装配电子枪时控制阴极与第一栅极间距的光纤传感器的结构及其测量系统.传感器的测量范围为10~160μm,精度可达3.8%.讨论了影响传感器特性的若干因素,如制作工艺、表面粗糙度、倾斜度、环境温度和LED的光谱特性. 相似文献
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光纤表面等离子体共振传感器研究进展 总被引:4,自引:0,他引:4
以光纤传输技术的表面等离子体共振技术有机结合的光纤表面等离子体共振传感器,是实现微量生物和化学活性物质定量测定的重要技术之一。介绍了表面等离子体共振的基本原理,表面等离子体共振光纤传感器的制作及应用的研究进展。 相似文献
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光纤表面等离子体共振(Surface plasmon resonance,SPR)传感器是一种将光纤纤芯作为激发SPR效应基体的新型传感器.本篇论文基于LabVIEW搭建虚拟仿真设计平台,依照材料参数与组件结构做理论计算,可即时改变尺寸及材料参数,了解SPR组件参数对感测效果的影响,找到最佳参数.以PMMA塑料光纤虚拟仿真结果显示,镀银薄膜40nm于光纤研磨表面上,能够制造出一个较佳的光纤SPR传感器;最后,以不同折射率的待测物进行仿真计算,得到共振波长与折射率关系. 相似文献
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在光纤式叶尖间隙测量系统中,光源波动、光纤弯曲损耗、反射面粗糙度和反射面形状因子会降低测量精度,为此从光纤传感器端面结构入手分析了双圈型和三圈型端面结构对这些影响因素的消除作用。通过建立带反射面形状因子的单光纤对接收光功率函数模型,发现双圈型端面结构可以通过接收光功率的比值消除光源波动、光纤弯曲损耗以及粗糙度的影响。然而双圈型接收光功率的比值同时与间隙和反射面形状因子有关,因此单个比值无法消除反射面形状因子的影响,但可通过采用三圈型端面结构,用两组比值来消除反射面形状因子的影响。三圈型端面结构可以进一步消除双圈型端面结构不能消除的反射面形状因子影响,因此具有更为广泛的适应性。 相似文献
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In this paper, an optical absorption based fiber optic surface plasmon resonance (SPR) sensor has been studied theoretically. The theoretical treatment is based on Kretschmann’s SPR theory and the Lorentz model that expresses a damped harmonic oscillator is included in the treatment for optical absorption in the sensing layer. The optical source considered is an un-polarized collimated beam. The light is coupled to the fiber using a microscope objective that focuses the beam at the center of the input face of the fiber. The effects of the parameters related to the sensing region, the light source and the optical fiber on the sensitivity and the operating range of the SPR sensor have been studied with the help of numerical calculations and computer simulations. It has been found that the excitation frequency in absorption-based fiber optic SPR sensor is an important parameter. The sensitivity is better for the lower off-resonance excitation frequency. The sensitivity and the operating range of the sensor are better for large value of the core diameter. The optimization of numerical aperture of the fiber, film thickness and the length of the sensing region is required to achieve the maximum sensitivity. Further, the increase in the extinction coefficient of the sample increases the sensitivity of the sensor while the decrease in the width of its absorption spectrum increases the sensitivity. The sensitivity and the operating range of the sensor are better for small values of the refractive index of the absorbing sample. 相似文献
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P. Biswas S. Bandyopadhyay K. Kesavan S. Parivallal B. Arun Sundaram K. Ravisankar K. Dasgupta 《Sensors and actuators. A, Physical》2010,157(1):77-83
The paper covers detailed investigation on encapsulation and packaging of fiber Bragg grating (FBG) for strain sensing of concrete structures in embeddable form. Non-uniform strain distribution due to imperfect curing of the epoxy and its effect on the FBG spectrum has been studied experimentally and correlated with theoretical simulation. For a specific package, an optimal curing condition has been found and shown to have good repeatability. The successfully packaged sensor has been embedded in a concrete structure and the response has been found to be linear. Response of the sensor under static loading condition is compared with surface mountable electrical resistance strain gauge (ERSG) and embeddable type EFPI (extrinsic Fabry Perot interferometer) fiber optic sensor. The sensor has also been tested under dynamic loading of the structure. 相似文献