A system (200) and method for performing an internal inspection on a rotor blade (16) of a wind turbine are disclosed. The system includes a sensing device (202), a cable (210) for raising and lowering the sensing device within the rotor blade, and a positioning device (206) attached to at least one of the sensing device and the cable. The positioning device can be configured to space the sensing device apart from an interior surface (208) of the rotor blade as the sensing device is raised and lowered within the rotor blade.