Method for preparing sensitive coil of reflection type optical fiber current sensor

Abstract

The invention relates a method for making a sensor coil of a reflective optical fiber current sensor. A groove which takes the shape of the spiral of Archimedes is processed on a ring-shaped metallic framework, and sensitive fiber is wound in the groove; after filled with fiber paste and fixed, the groove is sealed; finally, the stress on the sensitive fiber is released by temperature ictus and vibration, thus causing the state of the sensitive fiber to be stable. The method of the invention can ensure that the sensitive fiber coil has good stability even under certain perturbation and can guarantee the ideal measuring precision; meanwhile, in the method of the invention, the metallic framework is adopted, so as to reduce the making difficulty and cost and realize the consistency of winding easily with respect to the technique.

Description

technical field [0001] The invention relates to a reflective optical fiber current sensor, in particular to a sensitive optical fiber coil for the reflective optical fiber current sensor. Background technique [0002] The fiber optic current sensor is a photoelectric sensor based on the Faraday effect and sensitive to the current passing in the conductor. Because of its advantages of high voltage insulation, high safety and reliability, and low maintenance costs, it has a good market prospect, especially The reflective fiber optic current sensor has better performance due to its better reciprocity. [0003] In the reflective fiber optic current sensor, the left-handed and right-handed circularly polarized light transmitted in the sensitive coil will induce different phase changes after the magnetic field generated by the current to be measured, and then by demodulating the phase difference between the left-handed and right-handed circularly polarized light waves Get the mag...

AI Technical Summary

Problems solved by technology

The sensitive coil described in this method needs to be annealed for optical fiber stress relief, and the optical fiber cannot be completely fixed in the capillary, so the stress it receives will change with changes in external conditions

[0005] In addition, the stress generated by the sensitive optical fiber coil with temperature changes can be compensated by temperature control, while the sensitive coil skeleton is affected by temperature changes, and the stress caused by structural deformation depends on the material of the skeleton structure. The greater the material expansion rate, The more severe the deformation of the skeleton structure, the greater the stress it may cause on the sensitive fiber, resulting in nonlinearities that are difficult to compensate

Metal materials have good processability and low cost, but the coefficient of linear expansion is large, so the coil bobbin made of it is easily affected by stress

Images