Single glass block Faraday effect current sensor with homogeneous isotropic closed optical circuit

Area of Science:

• Optoelectronics
• Sensor Technology
• Materials Science

Background:

• High-accuracy optical-current sensors require precise optical circuits.
• Existing designs may face limitations in achieving homogeneity and isotropy.
• Minimizing crosstalk is crucial for reliable current sensing.

Purpose of the Study:

• To propose a new scheme for a closed, homogeneous, and isotropic optical circuit.
• To enable high-accuracy optical-current sensing.
• To investigate and minimize crosstalk in optical current sensing.

Main Methods:

• Utilizing a single solid polygonal solid with reflection surfaces.
• Coating reflection surfaces with quarter-wavelength dielectric thin-film layers for the Faraday cell.
• Deriving the design principle and performing numerical simulations.
• Conducting theoretical and experimental investigations of crosstalk.

Main Results:

• The proposed scheme achieves a closed, homogeneous, and isotropic optical circuit.
• Numerical simulations demonstrate applicability across various Faraday materials.
• Experimental validation with SF57 Faraday material shows low crosstalk for nearby currents.
• The design principle is theoretically derived and numerically verified.

Conclusions:

• The proposed optical circuit scheme is effective for high-accuracy optical-current sensors.
• The use of a polygonal solid with thin-film coatings successfully minimizes crosstalk.
• This approach offers a promising solution for precise current measurement in various applications.