Study on Charge Oscillation-Induced Low-Frequency Electric Field
Electric field induced by charge oscillation has been investigated by simulation of the electric field distribution using the finite-difference frequency-domain method. In addition, the electric field was induced by spatial oscillation of a sample to which a DC voltage was applied. The simulation and evaluation of the electric field verified that the efficiency for inducing the electric field has a proportional relationship with the amplitude displacement of a charged object, and detecting the electric field from the top to the side of the object is possible. Keywords—static electricity; charge oscillation; electric field; low frequency
64-Parallel Electro-Optic Data Acquisition System for Real-Time Monitoring of RF Near-Fields Images
Demonstrated for the first time is a system for real-time monitoring of electromagnetic near-field distributions over devices/circuits at a specific radio frequency. It is based on the electro-optic heterodyne detection with the photonic parallelism employed; 8 x 8 pixel data are acquired simultaneously via arrays of photodiodes and mixers. The highest frame rate is 10 Hz, which provides even real-time display of motion pictures. Reported are its applications to a patch antenna and a moving RF emitter.
Kerr effect in gas and its application to noncontact measurement of electric field
A noncontact measurement of electric field is proposed based on the Kerr effect in gases. With the Kerr sensing technique, the electric field can be measured without causing any field disturbance. Kerr constants of gases are, however, very small compared with those of liquids, and this ideal technique has not been applied to electric field measurement in gas. In this study, a system is developed for a highly sensitive measurement of the small phase retardation caused by the Kerr electro-optic effect in gases. An optical phase modulation technique is effectively adopted to improve the sensitivity of the system. With this optical system, (i) dc stressed uniform electric fields in sulfur hexafluoride, nitrogen, and carbon dioxide gases at the pressure of 0.2–0.5 MPa and (ii) ac stressed uniform electric fields in atmospheric air are measured.