Method for manufacturing seven-core fiber grating micro-scale measurement probe based on self-assembly principle

The invention provides a method for manufacturing a seven-core fiber grating micro-scale measurement probe based on a self-assembly principle, and belongs to the technical field of precision instrument manufacture. The method is that the diameter of single-die optical fibers subjected to engraving of a fiber grating is reduced by a mechanical processing or hydrofluoric acid fiber corroding method; seven diameter-reduced single-mode fibers subjected to engraving of the fiber grating pass through fine tubes with inner taper angles, and the lower ends of the single-mode fibers are immersed into low-viscosity UV gel; self-assembly is performed according to the capillary phenomenon to form the most compact regular hexagonal structure; the seven diameter-reduced and self-assembled single-mode fibers subjected to engraving of the fiber grating are subjected to UV glue solidifying to obtain a seven-core fiber grating; the end surface of the seven-core fiber grating is ground through a fiber grinding machine; a spherical needle point is processed at the grinded end of the seven-core fiber grating by a fused fiber method or a microsphere installation method, so as to finish the processing of the seven-core fiber grating probe. The fiber grating is free of signal crosstalk, low in cost and low in loss.