Patent ID: 7667851
Filing Date: 2010-02-23
Classification: G01B,G01D,G01N

Abstract:
1. A system for testing a physical attribute of a manufactured object, the system comprising: a laser ultrasound generation system; a beam of coherent electromagnetic energy directed from the laser ultrasound generation system; a beam splitter in the path of the beam of coherent electromagnetic energy; a two wave mixing interferometer; a probe beam from the beam splitter directed at the manufactured object that reflects from the manufactured object with an altered wave characteristic thereby defining a resulting beam; a pump beam from the beam splitter directed at a wave characteristic adjusting device having an electro-optic polarizer in communication with a portion of the pump beam, a first electro-optic phase modulator in communication with a portion of the pump beam when the electro-optic polarizer operates in a first mode, and a second electro-optic phase modulator in communication with a portion of the pump beam when the electro-optic polarizer operates in a second mode, so that when the pump beam is communicated with the at least one of the first or second electro-optic phase modulators, the pump beam is frequency adjusted; a two wave mixing interferometer in communication with the resulting beam and the frequency adjusted pump beam and in communication with the wave characteristic adjusting device, so that the frequency adjustment of the pump beam is based on a comparison of the pump beam and the resulting beam that compensates for altered wave characterstics used by a scanning motion of the probe beam.