Patent ID: 8294782
Filing Date: 2012-10-23
Classification: G01R,H04N

Abstract:
1. An electromagnetic field high speed imaging apparatus including: a lighting unit capable of outputting modulated light amplitude-modulated with a modulation frequency fLO; a probe unit comprising an electrooptic element or magnetooptic element whose birefringence characteristic locally changes due to the electric field or the magnetic field of a subject frequency fRF emitted from a subject that is a measurement subject, thereby causing a local polarization state to occur in the modulated light irradiated thereon from said lighting unit and which has said modulated light further modulated by a near electromagnetic field of the subject frequency fRF for frequency mixing so as to produce detection light containing a difference frequency component Δf between the modulation frequency fLO of said modulated light and the subject frequency fRF; an optical unit that converts the local polarization state in the detection light produced by said probe unit into local intensity of light and image-forms the detection light subjected to the local intensity conversion; an imaging unit comprising an image sensor having an imaging surface located at a position where said detection light is image-formed by said optical unit and formed of a plurality of pixels, which sensor photoelectric-converts said detection light; and a processing unit that analyzes electric signals from the image sensor of said imaging unit and generates information containing a two-dimensional image of distribution of the near electromagnetic field emitted from said subject, wherein each of the pixels of the image sensor of said imaging unit comprises a photoelectric conversion element for converting said detection light from said optical unit into an electric charge, a plurality of charge storages, and a charge splitting part for dividing the electric charge generated in the photoelectric conversion element between said plurality of charge storages.