Manufacturing a wind turbine blade shell part

A method for manufacturing a wind turbine blade part, the method comprising:

• laying up fibre material on a mould surface of a mould to form a fibre material layup having a first surface facing the mould surface, wherein one or more wind turbine blade components includes a wind turbine blade component comprising a fibre material element (11), wherein the fibre material element (11) comprises the fibre material layup;
• providing an electrically conductive element (41) and a magnetic field generator (42) for generating an Eddy current in the electrically conductive element;
• arranging the electrically conductive element, the magnetic field generator, and the fibre material element such that at least a part of the fibre material element is positioned between the electrically conductive element and the magnetic field generator;
• embedding or partly embedding the electrically conductive element in the fibre material layup proximate to a second surface of the fibre material layup opposite the first surface of the fibre material layup;
• generating an Eddy current in the electrically conductive element using the magnetic field generator;
• generating, using a magnetic sensor (42), a signal representing a magnetic field induced by the generated Eddy current, wherein the magnetic sensor (42) is arranged at the first surface of the fibre material layup opposite the electrically conductive element;
• and
• forming the wind turbine blade part by assembling the wind turbine blade components.