光纤比色测温传感器研制与稳定性研究

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1、内蒙古科技大学硕士学位论文摘要随着光导纤维技术的发展，出现了光纤传感器检测技术。同时采用光纤传感器与辐射测温方法相结合的测温技术日渐成熟并得到广泛应用，该种测温仪器具有高准确度、高精度、高灵敏度、抗干扰能力强、传感传输一体化、结构简单安装方便等特点，受到相关企业广泛重视。本论文目的是基于比色测温的原理，结合光纤传感技术研制一种新型光纤辐射测温传感器系统。本文根据比色测温方法的理论和光强度R(T)与温度T变化曲线，从测温曲线的动态范围、相对灵敏度、线性度方面研究传感器的两个工作波长的选取，确定选择范围在0.6~1.0μm，由滤光波长匹配

2、实验确定带通波长分别为0.66μm和0.72μm。应用透镜耦合原理设计了测温传感器采光系统；采用光纤导光，提高了测温传感器的抗干扰能力。选用PN502光电管作光电转换器与高增益低噪声MAX4206直流对数放大器，提高了测温传感器的精度，基于AT89C52芯片设计了单片机系统并进行了电路参数优化。实验结果表明，该系统线性度达到0.32％，相对误差小于±3℃。通过配置线性化前置放大电路解决了传感器信号输出非线性问题，采取有源低通滤波器抑制了系统噪声，从而提高了传感器稳定性能，实验结果表明，该系统重复性误差±5℃，示值波动小。关键词：光纤传

3、感器比色法滤波片稳定性-1-内蒙古科技大学硕士学位论文AFiber-opticalColorimetricRadiationSensorAnditsStabilityAbstractWiththedevelopmentofthefiber-opticaltechnology,anewthermometrictechniquebyfiber-opticalsensorcombinedradiationthermometryappearedandgotgraduallyextensiveapplicationinsmeltingproce

4、ss.Thisthermaldetectorhastheadvantagesofhighaccuracy,highsensitivityandstronganti-interferenceability.Besidesthesetheinstrumenthasthesimplestructure.Itcanbeinstalledeasilyandcanrealizeconductionandtransmissionintegrally.Becauseofthese,anewfiber-opticalsensorsystemontheb

5、asisofcolorimetrictheorywasstudied.CombinedthecolorimetricmeasuringtemperaturetheoryandR(T)-Tcurvewithnumericalanalysismethods.Twoofoperatingwavelengthinarangeof0.6µm-1.0µmisstudiedbasedonthedynamicrange,relativesensitiveness,linearitydegreefromtemperaturecurve.Accordin

6、gtomatchingfilterdetection,twowavelengthof0.66µmand0.72µmwereselectedrespectively.Intheprocessofdesigningofdetectorsystem,thecomponentswerechosenaccordingtotheoperatingprincipleandfunctionofeachpartofthethermaldetector.Amongthese,lightingsystemofthedetectorwasdesignedba

7、sedonlenscouplingtheory,andmulti-modefiberwaschosenasthetransmissionpath.TheDClogarithmamplifier-MAX4206wasusedassignalconditioncircuit.ThehardwaresystemwasdesignedaccordingtoAT89C52monolithicmachinesystemandparameterofitscircuitwasoptimized.Theexperimentresultsshowedth

8、atlinearityofthesensorsystemturntoreach0.32%andrelativeerrorissmallerthan±3℃.Thesignaloutputnonlinearityproble