Li-Fi-based all-optical transmission magnetic field detection system

Abstract

The present invention provides a Li-Fi-based all-optical transmission magnetic field detection system and relates to the technical field of optical fiber sensors. The system of the invention includesan optical fiber directional coupler, an LD light source, a magnetic field sensor, a matching liquid and a Li-Fi module. The optical fiber directional coupler is configured as a 2*2 optical fiber directional coupler and is provided with a first port, a second port, a third port and a fourth port. The LD light source is used to emit the modulated laser of a preset frequency to the magnetic field detection system. The output end of the LD light source is connected with the first port. The magnetic field sensor is connected with the second port through a y-type optical fiber body and is used fordetecting the strength of the magnetic field. The Li-Fi module comprises a Li-Fi transmitting unit and a Li-Fi receiving unit. The Li-Fi transmitting unit is connected with the third port through a matched grating. The Li-Fi receiving unit is connected with a photoelectric detector. In this way, a wireless transmission network between the magnetic field sensor and the photoelectric detector is established. According to the invention, in the full-light excitation mode, a to-be-tested magnetic field is not influenced at all. The system is small in size, and is suitable for being used in a narrowspace.

Description

technical field [0001] The invention relates to the technical field of optical fiber sensors, in particular to a Li-Fi-based all-optical transmission magnetic field detection system. Background technique [0002] The current magnetic field sensors are mainly based on mechanisms such as Hall effect, magnetoresistance effect, fluxgate effect, tunnel effect and nuclear magnetic resonance effect. Interference is generated, thereby limiting the further improvement of the sensor detection accuracy. Traditional magnetic field sensors are bulky and difficult to detect magnetic fields in narrow spaces. The optical fiber magnetic field sensor does not affect the electromagnetic field to be measured, and has the advantages of corrosion resistance, light weight, small size, etc., which is beneficial to the application in aviation and aerospace fields and narrow spaces. The optical fiber cantilever beam magnetic field sensor combines the characteristics of the optical fiber magnetic fi...

AI Technical Summary

Problems solved by technology

[0002] The current magnetic field sensors are mainly based on mechanisms such as Hall effect, magnetoresistance effect, fluxgate effect, tunnel effect and nuclear magnetic resonance effect. Interference, which limits the further improvement of sensor detection accuracy

Traditional magnetic field sensors are bulky and difficult to detect magnetic fields in narrow spaces

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