Berlin 2001 – wissenschaftliches Programm
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K: Kurzzeitphysik
K 1: Short time-scale dynamics and diagnostics
K 1.7: Vortrag
Montag, 2. April 2001, 18:05–18:20, EB107
Fiber-Optic Sensor for Transient Current Measurement — •Christian Helmig1, Dirk Peier1, and Volker Aust2 — 1Institute of High Voltage Engineering, University of Dortmund, Emil-Figge-Strasse 66, 44227 Dortmund — 2Fraunhofer EMI, Freiburg i. Br.
Both the pulse shape and amplitude of transient currents are important criteria for the technical design and optimization of pulse-based systems. Therefore, a large bandwidth and high accuracy are required for adequate current measurement systems. Conventional transient current measurement systems, such as shunts or Rogowski coils, are assembled partially very bulky dependent on the measured current and lack a potential separation, which excludes the use in some applications.
The fiber optic current sensor presented here overcomes the limitations of earlier devices. In addition to the inherent potential separation, it has further advantages. For example, it enables a more compact design and is free of saturation effects. Moreover, since the measuring principle is based on the Faraday effect, the attainable bandwidth is only limited by the speed of light and the length of the sensing fiber coil. Therefore, pulse currents having rise times of nanoseconds can be measured. when high-speed photo detectors are used.
The novel fiber-optic current sensor uses a specially designed flint glass fiber as the probing element. Reliable operation is demonstrated by recordings of a great variety of pulse shapes stemming from various pulse-current generators and proven by reference tests.