This　paper　proposes　a　linear　optical　current　transducer　based　on　a　crystal　wedge　imaging　detection.　It　converts　the　Faraday　magneto-optical　rotation　to　the　horizontal　displacement　of　the　light　and　dark　interference　fringes　by　using　the　crystal　wedge,　and　then　uses　a　dual-quadrant　detector　to　locate　the　fringes　to　achieve　a　real-time　measurement　of　current.　Compared　with　the　usual　light　intensity　detection　method　it　has　the　outstanding　advantages　of　no　optical　power　dependency,　very　low　temperature　drift,　and　simple　algorithm　and　linear　measurement.　In　addition,　a　magneto-optical　film　is　employed　to　replace　the　magneto-optical　crystal　to　cut　down　the　optical　path　and　the　linear　birefringence.　The　dual-quadrant　detector　is　employed　to　achieve　low　cost,　high　resolution,　and　high　precision.　The　experimental　results　show　that　the　transducer　meets　the　accuracy　class　0.2　S.　©　2001-2012　IEEE.