DETECTING ELEMENT FOR FIBRE-OPTIC ELECTRIC CURRENT AND MAGNETIC FIELD INTERFEROMETRIC SENSOR Russian patent published in 2011 - IPC G01R19/15 G01R33/32 

FIELD: physics.

SUBSTANCE: detecting element is in form of a piece of a quartz fibre light guide with internal linear double refraction placed on a circle. The fibre light guide has a structure with optical parameters which periodically recur along the fibre. The periodic structure is in form of a spiral structure with internal linear double refraction. The pitch L_tw of the spiral, beat length L_b of internal linear double refraction, temperature coefficient α_b of internal linear double refraction, radius R of the cirlce of the piece of fibre light guide, radius r of the cross-section of the fibre light guide, the operating wavelength λ of the interferometric sensor and refraction index n_o(λ) of the cladding of the fibre light guide are selected from the relationship

EFFECT: reduced dependency of measurement results on temperature.

9 dwg