| Popis: |
Polarization modulation of light from a 633 nm He-Ne laser, using the Pockels and Faraday effects in appropriate materials, can serve as an electrometer and magnetometer with sensitivities to 0.06 volt/cm and 0.03 gauss or better. With the sensor material placed in the field and the laser illuminator and receiver mounted remotely, this technique can be used for precise, wideband measurement of transient effects and power flow in substation environments where high fields prohibit direct measurements. This paper describes the performance of these devices used in prototype systems for voltage transient monitoring and also for precise voltage and current metering. The latter system requires thermal sensing as well, with an accuracy of 0.1°C; optical methods for accomplishing this will be described.© (1976) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only. |
