Detection and measurement system for micro-magnetic fields - has output from scanning electron microscope directed onto photodiode with electrode matrix

摘要

The detection system to measure the micromagnetic or electrical field generated by an object uses a scanning electron microscope. The deflected electron beam falls onto a fluorescent screen that is positioned in front of a window in the housing of the microscope. The transmitted light is focussed onto a photodiode (20). The photodiode has a pair of planar layers (21,22), one of which is a "p" type and the other an "n" type. The surfaces have electrodes (24,26) that are set at 90 degrees to each other on the surfaces. The surfaces are separated by an intrinsic intermediate layer. ADVANTAGE - Provides accurate measurement of micromagnetic field.