电桥电路
电桥电路BRIDGECIRCUITSSECTION2BRIDGECIRCUITSWaltKesterINTRODUCTIONThissectiondiscussesthefundamentalconceptsofbridgecircuits,andisfollowedbyasectiononprecisionopamps(Section3).Section4focusesonthedetailedapplicationcircuitsrelatingtostraingage-basedsensors.Sections2and4canbereadsequentiallyifthereaderalreadyunderstandsthedesignissuesrelatingtoopampswhicharecoveredinSection3.Resistiveelementsaresomeofthemostcommonsensors.Theyareinexpensivetomanufactureandrelativelyeasytointerfacewithsignalconditioningcircuits.Resistiveelementscanbemadesensitivetotemperature,strain(bypressureorbyflex),andlight.Usingthesebasicelements,ma
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