| 摘要 |
A threat field sensor has a hollow metal enclosure with imperforate side walls except for a single aperture that is small as compared with the wavelength of interfering electromagnetic energy. A coaxial conductor is located in the enclosure cavity and has separate sets of leads interconnected to each conductor end. Electric signals induced in the coaxial conductor and present at the conductor ends by the external electromagnetic fields passing through the enclosure aperture are converted to two corresponding light signals. The light signals are transmitted to remotely located processing apparatus by an optical fiber link where the light signals are converted once again to electric signal counterparts. Summing and differencing these electric signals provides two final signals representative of the electric and magnetic field, respectively. The electric field being normal to the coaxial conductor is uniquely defined by one such measurement; however, since the magnetic field is parallel to the sensor coaxial conductor, two orthogonal measurements must be taken to resolve the magnetic field.
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