Apparatus for measuring lightning current to monitoring wind turbine blade

The present invention by measuring the lightning current of a turbine blade using a fiber optic current sensors, to a lightning current measuring device for wind power blades monitor capable of monitoring the amount of damage the blade. To this end, the present invention is that the output light from the light source is incident to the optical sensor head, and then the polarization of incident light through the first polarizer in the optical sensor head, the polarized light in the optical sensor head passes through the ferrimagnetic garnet since due to the magnetic field generated by the lightning current is polarization is changed through the second polarizing plate and vary the light intensity, light reception monitor wind power blade to measure lightning current in the blade by converting the optical signal into an electrical signal It provides for lightning current measuring device. The optical sensor head is characterized in that by using the time difference of the lightning current detected according to the installed location number along the longitudinal direction of the blade, through a respective optical sensor head to know the location of the lightning strike blade. Wind power, a blade, a lightning stroke, an optical sensor head, a polarizing plate, a ferrimagnetic garnet