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We present here the design of a sensitive Compact Faraday-modulator (CFM)based optical magnetometer for imaging the distribution of weak local magneticfields inside hysteretic magnetic materials. The system developed has a rootmean square (rms) noise level of 50 mG.Hz-1/2 at a full frame rate of 1 frameper second with each frame being of size 512 x 512 pixels. By measuring thelocal magnetic field distribution in different superconducting samples we showthat our magnetometer provides an order of magnitude improvement in the signalto noise (S/N) ratio at low fields as compared to ordinary magneto-opticalimaging technique. Moreover, it provides the required sensitivity for imagingthe weak magnetization response near a superconducting transition where anumber of other imaging techniques are practically unviable. An advantage ofour CFM design is that it can be scaled in size to fit into situations withtight space constraints.

High sensitivity differential Magneto-Optical Imaging with a compact Faradaymodulator