分析了多模光纤强度型微弯传感器中多模光纤的弯曲损耗。提供了弯曲半径为1mm^8mm和10mm^26mm,光源波长为0.633μm、0.780μm、0.830μm G raded Index多模光纤的弯曲损耗特性的测试结果。首次观察到了多模光纤弯曲损耗随着弯曲半径的...分析了多模光纤强度型微弯传感器中多模光纤的弯曲损耗。提供了弯曲半径为1mm^8mm和10mm^26mm,光源波长为0.633μm、0.780μm、0.830μm G raded Index多模光纤的弯曲损耗特性的测试结果。首次观察到了多模光纤弯曲损耗随着弯曲半径的减小而增大的趋势,以及在弯曲半径为10mm^26mm范围内损耗特性的不平滑性,并利用传播常数和W G模理论对此现象进行了解释。展开更多
研制了一种光纤微弯气压传感器,提出了一种利用梯形弹簧的压力非线性特性补偿光纤微弯传感器非线性的方法,并提出了利用差动检测克服光路损耗不稳定的方法。介绍了梯形弹簧光纤微弯传感器工作原理,对梯形弹簧变形量压力响应曲线进行非...研制了一种光纤微弯气压传感器,提出了一种利用梯形弹簧的压力非线性特性补偿光纤微弯传感器非线性的方法,并提出了利用差动检测克服光路损耗不稳定的方法。介绍了梯形弹簧光纤微弯传感器工作原理,对梯形弹簧变形量压力响应曲线进行非线性拟合,得到二次拟合曲线。实验测试了0～0.1 MPa范围的气压传感特性。结果表明,光纤气压传感器的输出电压信号与气压值具有良好的线性关系,得到气压测量灵敏度系数约为2000 m V/MPa,能够满足气象及飞行器高度监测中对气压测量的要求。展开更多
The distributed strain sensor has significant application in real time measurement of strain status for large and important engineering structures such as aircraft, bridge and dam. In this paper, a quasi distributed...The distributed strain sensor has significant application in real time measurement of strain status for large and important engineering structures such as aircraft, bridge and dam. In this paper, a quasi distributed optical fiber strain sensor system is set up using optical time domain reflect technique. The local strain sensors based on a novel microbend configuration are designed and applied to measure local strains along the optical fiber. As the result of the experimental research, the microbend sensors show high sensitivity, good linearity and repeatability in certain operation range.展开更多
文摘分析了多模光纤强度型微弯传感器中多模光纤的弯曲损耗。提供了弯曲半径为1mm^8mm和10mm^26mm,光源波长为0.633μm、0.780μm、0.830μm G raded Index多模光纤的弯曲损耗特性的测试结果。首次观察到了多模光纤弯曲损耗随着弯曲半径的减小而增大的趋势,以及在弯曲半径为10mm^26mm范围内损耗特性的不平滑性,并利用传播常数和W G模理论对此现象进行了解释。
文摘研制了一种光纤微弯气压传感器,提出了一种利用梯形弹簧的压力非线性特性补偿光纤微弯传感器非线性的方法,并提出了利用差动检测克服光路损耗不稳定的方法。介绍了梯形弹簧光纤微弯传感器工作原理,对梯形弹簧变形量压力响应曲线进行非线性拟合,得到二次拟合曲线。实验测试了0～0.1 MPa范围的气压传感特性。结果表明,光纤气压传感器的输出电压信号与气压值具有良好的线性关系,得到气压测量灵敏度系数约为2000 m V/MPa,能够满足气象及飞行器高度监测中对气压测量的要求。
文摘The distributed strain sensor has significant application in real time measurement of strain status for large and important engineering structures such as aircraft, bridge and dam. In this paper, a quasi distributed optical fiber strain sensor system is set up using optical time domain reflect technique. The local strain sensors based on a novel microbend configuration are designed and applied to measure local strains along the optical fiber. As the result of the experimental research, the microbend sensors show high sensitivity, good linearity and repeatability in certain operation range.
