Optical fiber vector magnetic field sensor and polarization detection method based on polarization-maintaining optical fiber transmission

Abstract

The invention discloses an optical fiber vector magnetic field sensor based on polarization-maintaining optical fiber transmission, comprising: a sensing probe, a first polarization-maintaining optical fiber polarization detection optical circuit unit, a second polarization-maintaining optical fiber polarization detection optical circuit unit, and a third polarization-maintaining optical fiber polarization detection optical circuit unit , the first input optical fiber unit, and the second input optical fiber unit; the present invention also discloses a method for analyzing the polarization of an optical fiber vector magnetic field sensor based on polarization-maintaining optical fiber transmission. After passing through the optical fiber detector polarization optical path unit, it enters the photoelectric detection and demodulation system for photoelectric demodulation, and uses the Faraday rotation optical effect and Jones matrix principle to obtain the magnetic field intensity; the present invention provides high sensitivity, high New application requirements such as integration, high detection accuracy, wearable, low cost, miniaturization, and three-dimensional vector sensing.

Description

technical field [0001] The invention relates to the technical field of optical fiber sensors, in particular to an optical fiber vector magnetic field sensor and a polarization detection method based on polarization-maintaining optical fiber transmission. Background technique [0002] Magnetic field sensors have important application values ​​in geophysical surveying, navigation, military equipment applications, biomedical sensing, and aerospace fields. With the development of application fields such as human-computer exchange, biological imaging, unmanned monitoring, and industrial intelligent manufacturing, high sensitivity, high integration, high monitoring accuracy, wearable, low cost, miniaturization, and three-dimensional vector sensor have been proposed for magnetic field sensors. Sense and other new application requirements. [0003] Various types of optical fiber sensors have the advantages of simple fabrication, low cost, high sensitivity, small size, compact and l...

AI Technical Summary

Problems solved by technology

However, in the current vector sensor, the sensor probe and its associated demodulation system are not highly integrated, have low error tolerance and high cost, especially for the polarization analysis system for intensity demodulation, the cost of the analyzer is relatively high. The mechanical failure of the demodulation system interface is difficult to detect and repair, and it is easy to cause the error of the intensity demodulation result caused by the polarization error

Images