Method for measuring magnetic induction intensity of magnetic field using short cavity fiber laser

US8896302B1 · kind B1 · utility

Assignee

• Beijing information Science & Technology University · CN

Inventors

• Lianqing Zhu · Beijing, CN
• Fei Luo · Somerville, US
• Yinmin Zhang · Beijing, CN
• Wei He · Beijing, CN
• Mingli Dong · Beijing, CN
• Xiaoping Lou · Beijing, CN
• Yudong Jia · Beijing, CN

Key dates

• Filing date: Oct 9, 2013
• Grant date: Nov 25, 2014
• Expiry date: Oct 9, 2033

Classification

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

Abstract

A method for measuring magnetic induction intensity of a magnetic field using a short cavity fiber laser, includes the steps of: a) arranging the short cavity fiber laser, where the short cavity laser has sequentially coupled laser diode pumping source, a wavelength division multiplexer, a fiber Bragg grating, an active optical fiber and a loop mirror; b) fixing the short cavity fiber laser on a magnetostrictive material; c) disposing the short cavity fiber laser and the magnetostrictive material in the magnetic field to be measured, and matching the stretching direction of the magnetostrictive material with the direction of the magnetic field to be measured; d) measuring the drift amount of longitudinal mode output by the short cavity fiber laser; and e) calculating the magnetic induction intensity of the magnetic field to be measured.