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ID:36327056
大小:2.08 MB
页数:45页
时间:2019-05-09
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1、检测技术光电开关光电开关漫反射式光电开关镜反射式光电开关对射式光电开关槽式光电开关光纤式光电开关光电开关光电开关-工作原理光电开关(光电传感器)是利用被检测物体对光束的遮光或反射,由同步回路选通而检测物体的有无,所检测的物体不限于金属,对所有能反射光线的物体均可检测。光电开关-工作原理PrincipleofPhotoelectricSensorPrincipleofPhotoelectricSensorEmittingmethodPulse-modulatedMostofthephotoelectricsensorsemitabe
2、amwhichispulse-modulated.Inthismethod,astrongopticalsignaloffixedwidthisemittedatafixedtimeinterval.Thishelpsthereceivertodistinguishthesignalfromextraneouslightandtoachievealongsensingrange.PrincipleofPhotoelectricSensorPrincipleofPhotoelectricSensorUnmodulatedThehig
3、h-speedfibersensorFX2-A3RandthecolormarksensorLX-12Nseriesuseanunmodulatedbeam.Inthismethod,thebeamisemittedconstantlyatafixedintensity.Thisenableshigh-speedresponse,althoughthesensorsarealittlesusceptibletoextraneouslightascomparedtothesensorsusingamodulatedbeam.Prin
4、cipleofPhotoelectricSensor光电开关-漫反射式光电开关漫反射光电开关是一种集发射器和接收器于一体的传感器,当有被检测物体经过时,将光电开关发射器发射的足够量的光线反射到接收器,于是光电开关就产生了开关信号。当被检测物体的表面光亮或其反光率极高时,漫反射式的光电开关是首选的检测模式。光电开关-漫反射式光电开关漫反射式光电开关引起理想漫反射的光度分布局部较强漫反射时的光度分布Reflectivetype光电开关-对射式光电开关对射式光电开关的发射器和接收器是分离的,发射器发出的光线直接进入接收器。当被检测物体经
5、过发射器和接收器之间且阻断光线时,光电开关就产生了开关信号。当检测物体是不透明时,对射式光电开关是最可靠的检测模式。Thru-beamtypeGeneraluse光电开关-槽式光电开关槽式光电开关通常是标准的U字型结构,其发射器和接收器分别位于U型槽的两边,并形成一光轴,当被检测物体经过U型槽且阻断光轴时,光电开关就产生了检测到的开关量信号。槽式光电开关比较安全可靠,适合检测高速变化,分辨透明与半透明物体。U-shaped光电开关-镜反射式光电开关镜反射式光电开关是集发射器与接收器于一体,光电开关发射器发出的光线经过反射镜,反射回
6、接收器,当被检测物体经过且完全阻断光线时,光电开关就产生了检测开关信号。RetroreflectivetypeGeneraluseWithpolarizingfiltersWithpolarizingfiltersWithpolarizingfiltersWithpolarizingfiltersOppositetypesofpolarizingfiltersareplacedinfrontoftheemittingandreceivingelements.Ahorizontalpolarizingfilterplacedinfr
7、ontoftheemittingelementpassesonlyhorizontallypolarizedlightandaverticalpolarizingfilterplacedinfrontofthereceiverensuresthatonlyverticallypolarizedlightisreceived.Usingthisconfiguration,evenspecularobjectscanbereliablydetected.Withpolarizingfilters1Normalunpolarizedbe
8、amemittedfromtheLEDoscillatesinarandommanner.Asitpassesthroughthehorizontalpolarizingfilter,theoscillationisalignedhorizonta
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