title: An earth-isolated optically coupled wideband high voltage probe powered by ambient light.
abstract: 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.
authors.affiliation: Thomas J. Watson Sr. Laboratories of Applied Physics, California Institute of Technology, Pasadena, California 91125, USA. xzhai@caltech.edu
authors.forename: Xiang
authors.initials: X
authors.lastname: Zhai
authors.forename: Paul M
authors.initials: PM
authors.lastname: Bellan