US Patent 7409313 Method and apparatus for nondestructive evaluation of insulative coating

An apparatus is provided for determining thickness and thermal conductivity for an insulative coating disposed on a substrate in an object. The apparatus includes a source for rapidly applying a multiple optical pulses on a surface of the object, where the surface comprises the insulative coating. The system further includes a recording system configured to collect data representative of the propagation of the optical pulses in the object. The apparatus further includes a processor coupled to the recording system and configured to receive the data from the recording system and configured to determine a thickness value and a thermal conductivity value for the insulative coating.