Patent ID: 6370288
Filing Date: 2002-04-09
Classification: G01R,G02B

Abstract:
An optical magnetic field sensor probe for detecting a magnetic field, comprising:an input optical fiber for inputting light into the optical magnetic field sensor probe, a first drum lens, a polarizer, a magneto-optical device, an analyzer, a second drum lens, an output optical fiber for emitting light from the optical magnetic field sensor probe, and one lens holder disposed to hold both the first drum lens and the second drum lens, the input optical fiber, the first drum lens, the polarizer, the magneto-optical device, the analyzer, the second drum lens and the output optical fiber being arranged in order along a light path such that the input optical fiber, the first drum lens, the magneto-optical device, the second drum lens and the output optical fiber together form a confocal optical system, the analyzer has transmission and polarization directions that are different than the polarizer, and the first drum lens and the polarizer are axially symetrical about an axis through the magneto-optical device with the second drum lens and the analyzer, and wherein the lens holder has first and second holes therein with the first hole receiving the first drum lens and the input optical fiber so that an optical axis of the first drum lens coincides with an optical axis of the input optical fiber, and the second hole receiving the second drum lens and the output optical fiber so that an optical axis of the second drum lens coincides with an optical axis of the output optical fiber.