Movable probe carrying optical waveguides with electro-optic or magneto-optic material for measuring electric or magnetic fields

US4147979A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Peter Baues · Krailling, DE
• Hans Mahlein · Unterhaching, DE
• Peter Moeckel · Munich, DE
• Achim Reichelt · Unterhaching, DE
• Gerhard Winzer · Munich, DE

Key dates

• Filing date: Dec 13, 1977
• Grant date: Apr 3, 1979
• Expiry date: Dec 13, 1997

Classification

• Technology area (CPC G): Physics
• CPC primary: G01R33/032
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A probe for the non-contact measurement of electric or magnetic field strengths has two wave guides provided on a substrate. One of the wave guides has a measurement portion consisting of an electro-optical material or a magneto-optical material in a region of a measurement zone. A magnetic or electric field changes the index of refraction of the measuring portion and the intensity of a light wave traveling through this portion of the wave guide is reduced. Comparison is then made between a standard intensity in the other wave guide and a reduced intensity in the light traveling through the wave guide measuring portion.