Field calibration method for the reflection type polarization maintain optic fiber temperature sensor
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Abstract
Areflectiontypepolarizationmaintainopticalfibertemperaturesensorwasdesigned.The
operationprinciplewasintroducedandthesensingequationwasgiven.Analysisindicatedthatthe
propagationlossvarietywasthemainfactorwhichmadesensingequationparameterschange.So,inthe
applicationfieldwheretheopticalpathstructureofsensormightbere-assembled,theparameters
calibrationwasnecessary.Basedonthecharacteristicandtherelationofsensoropticalsectionoutput
signalandthesensingequationparameters,thepropagationlosscouldbeseparatedfromthesensor
initializationparametersandasimpleandpracticalfieldcalibrationmethod,withwhichthewholesensing
equationparameterscouldbecalibratedwhenthetemperatureatthesensorprobewasgiven,was
proposedandthecalculationequationwasestablished.Anexperimentalsensorsystemwasbuiltandthe
calibrationexperimentsweremadebychangingthepropagationloss.Thedateobtainedwereanalyzed
andcomparedwithpolynomialfittingandmodelcalculation.Theresultprovesthefieldcalibration
technologyandthesensingtemperatureprecisioncanbebetterthanupanddown0.5℃beforeandaftercalibration.
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