An earth-isolated optically coupled wideband high voltage probe powered by ambient light
An earth-isolated optically-coupled wideband high voltage probe has been developed for pulsed power applications. The probe uses a capacitive voltage divider coupled to a fast light-emitting diode that converts high voltage into an amplitude-modulated optical signal, which is then conveyed to a receiver via an optical fiber. A solar cell array, powered by ambient laboratory lighting, charges a capacitor that, when triggered, acts as a short-duration power supply for an on-board amplifier in the probe. The entire system has a noise level ≤0.03 kV, a DC-5 MHz bandwidth, and a measurement range from −6 to 2 kV; this range can be conveniently adjusted.
© 2012 American Institute of Physics. Received 8 July 2012; accepted 17 September 2012; published online 9 October 2012. The authors thank D. D. Felt for his suggestion on the trigger system. This work was supported by the U.S. Department of Energy (DOE).
Published - RevSciInstrum_83_104703.pdf