光纤传感技术

《光纤传感技术》由会员上传分享，免费在线阅读，更多相关内容在工程资料-天天文库。

1、光纤传感技术Fiberopticsensorshavetwomaintypes:sensorandlightThesensorcanbedividedintolightstressandphasemodulationDifferentformsofmodulation,polarizationmodulationandwavelengthmodulationaredifferentThesensor1fiber-opticfabry-perotsensorThefibrefabry-perot(f-p)senso

2、risanFmadeofopticalfiberThe-pinterferometer,thef-pcavityisthecoreofthesensor・Fiberopticf-psensingThedeviceismainlycomposedoftwoterminalsparallelandcoated,andtightlycoaxialandtightlysealedincylindricalknotsThefabricofthefabric・Theincidentlightreflectsandoccurs

3、separatelyonbothendsItisareflectionofthewavelengthofincidentlightandthematerialofthecavityRate・WhentheexternalactioncausesthecavitylengthLtochange,itcanbepassedThevariationofthephasephaseisassociatedwiththegreatereffectofthereflectedlightSmall.Thefiberopticf-

4、psensor1fiberSagnacsensorsFiberopticSagnacsensorsarebasedontheSagnacinterferenceprinciple,laserTwobeamsoflightenterthefiberringsfromtheendsandentertheprobeatoneendSensors・Thenon-reciprocallightdifferencebetweenthetwopathsintheopticalfiberringPerpendiculartoth

5、efiberopticringplane,theangularvelocityofinertiaspace!Therelationshipis:.ThephasedifferenceistrueTherotationofthefixedfiberringrelativetotheinertialspace・2fiberopticgratingsensorBragggratingsensors3fiberopticmicrobendsensorsThe5-lightstronglycoupleddisplaceme

6、ntsensor6fiberopticfluorescencesensorsThetemperaturecharacteristicoffluorescentmaterialisthebasisoftemperaturemeasurement,tracerareearthphosphorusThecompoundcanbemixedwithopticalfiber,whichmakesuptheprobeandisstimulatedtofluorescence・fluorsparTheintensityorli

7、feofthelightvarieswiththetemperature,detectingthevariationofthelightThepurposeoftemperaturemeasurement・ThethermalradiationeffectlightemphasizestheopticalfibertemperaturesensingThedevicebelongstopassivelighttoemphasizethesensor,whichisusedforhightemperaturemea

8、surementThespectralpowerdensityoftheopticalfiberblackcoelageprobecanbeusedbyPlankTheexpressionmeansthatthetemperatureisdeterminedbythechangeinthedetectionofenergy,givenbytheopticalfiberTh