Prototype Electric Field Sensor System.
Technical rept. Jul 67-Nov 69,
EG AND G INC BEDFORD MA
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The time history of the electric field generated in simulators at EMP simulation facilities such as ALECS and ARES is measured by sensor platforms which are electrically connected to recording systems. Sensor platforms which are directly wired are not desirable because of the high voltages induced in the cables during a test. The purpose of Phase II of this project was to fabricate, test and deliver a prototype electric-field sensor system utilizing a linearized Kerr cell. A sensor system was built in which a sensor head converts the time-varying electric field into a corresponding time-varying light signal. The conversion is accomplished by sensing the electric field with a dipole antenna whose output is applied to a quarter wavelength biased Kerr cell. Light from a tungsten lamp is focused by a lens system, passed through a polarizer, modulated by the Kerr cell, passed through an analyzer, and is then focused on the end of a fiber-optic light pipe. The light pipe conveys the optical signal to a detector unit located outside of the EMP simulator. Sensor system tests were performed with the prototype Kerr cell sensor system. Measurements were made of frequency response, electric-field intensity capability, dynamic range, measurement accuracy, directionality, magnetic isolation and temperature. Theoretical and actual results of the tests are reported.
- Test Facilities, Equipment and Methods
- Electricity and Magnetism