The present application provides a cooling hole location system for locating a cooling hole in a gas turbine component, wherein the cooling hole is covered by a thermal barrier coating. The cooling hole location system may include a light source positioned on a first side of the gas turbine component and an optical detector positioned on a second side of the gas turbine component. The optical detector detects light from the light source visible through the thermal barrier coating covering the cooling hole.

A substrate evaluation method includes: a measurement operation of measuring an absorbance spectrum in a wavenumber range including a peak of at least one of a LO (Longitudinal Optical) phonon or a TO (Transverse Optical) phonon by analyzing a substrate having an anisotropic structure formed thereon with an infrared spectroscopy analysis; and a derivation operation of deriving evaluation information about the anisotropic structure from the measured absorbance spectrum.