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Study on Displacement Measurement Technique Using Fiber Optic Sensors

Author: ZhangYi
Tutor: ZhouZhaoFei
School: Sichuan University
Course: Measurement Technology and Instruments
Keywords: Displacemnt measurement Fiber optic sensor The intensity modulation type The mask type
CLC: TP212
Type: Master's thesis
Year: 2002
Downloads: 891
Quote: 8
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Abstract


In environmefit test, lotS of conveniional disPlaeement tusducers aren’tsuitable, esPecially aimed tO measure the displacement in the itherlayer strUctUre ofweaPon, because the volume of sensor is too large tO install, or the test plane ofnarrow interlayer mwt be dealed with .So we chOose fiber optic sensors to measurethe disPlacement.In order tO avoid using exPensive optical systCm, reduce the complexity indebugging, we choose the intensity modulation tyPe of fiber optic sensors, whosestrUctUre is simple and reliable. There are two schemes, one is the mask type and theother is the reflective tyPe. The reflective tyPe can be used in uncontacted test, but ithas some shortcoming on our condition. For examPle, high quality is asked for theWrial and curvwt of reflective plane, the sensor sthers frOm the interference ofbackgrOund ligh, mmpfactUre of probe is comPlicated,we need tO design theaPProPriative hOlder in tes’ the span is only about l00mp, to extend the dynamicrange we must increase a set of oPtical lens on the end of oPtic fiber, but consurnedlyincrease the probe’s volume. Because of all above reason, the possibility of this kindof method aPplied tO actual work is little, so technical dePchent decides to chOosethe second methed tO develop the system using fiber optic sensors tO measure thediSPlacement, Which is more reliable and easier tO produce. It is comPosed of threepnd, Which are the fiber oPtic sensor, the circult of displacement measurement andcompUteL By the aPpropriative softwar, it can measure the disPlacement and displayit in real time. The stwthe of sensor is compact, the debugging of system is simple,meanwhile the sPan is lnnn and the resoluton is 0.5mp, so it can rePlaceconventional disPlaeemeni sensors in the environment tCSt required by taSk. msIIIpaper comPrises sevend partS as follows.In the first chaPer as preface, this paPer sunnnarizes the actUality anddevelopment of displacement measurements. It shOws tha the necessity andadvantae using the mask tyPe of displaeement measurend in environment test,comParing the excellence and defect of several tyPical measurements.On the basis of analyzing the distribution of light field of fiber thcoretically, thepaper deduces the math model of modulation function of the mask tyPe ofmeasurement in the second chaPterIn the third chaPtr, thes pape summarizes the operation ~iple of system, andcomPares several different measurement projeets. The Proect put forwar by thispaper may extend span not tO deerease the resolution. The particular light Way andsensor stfUCture are innovative on the research of displaeemellt measurements usingthe mask tyPe of fiber oPtic sensof, and we hav not seen releVan reportedliteratos.The paPer mainly illtrOduCes some designs of chief circuitS. At present, thiscireuit gathering faint input signal and the anti-interference tecboquCs can aPPly tOW new sensors, so it is a tyPical circuit design.’In the fiffe chaPtr, the pape intrOduces the ifor of softwar and listSrelevan Propos of clyef fhaotions.In the sixth chaPter, this pape recomrnnds the calibration device and verifiesthe aCademic modulation boon by measurement. The experimellt indicates thatreferenced chaImls can reduce the intefference in favOr of using it in engineering.MWle, the prOject advanced by us to extend SPan with fiber oPtic bind not onlydOes so, bu also grcaly imProves the liwi of the operaion curv.

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CLC: > Industrial Technology > Automation technology,computer technology > Automation technology and equipment > Automation components,parts > Transmitter ( converter),the sensor
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