Patent ID: 8269979
Filing Date: 2012-09-18
Classification: G01H,G01N,G01V

Abstract:
1. A device for detecting a defect in an attachment between a flip chip and a substrate, comprising: a generation laser providing a generation laser beam that impinges the top surface of the flip chip at a predetermined generation spot and generates an acoustic wave within the flip chip; a detection laser providing a detection laser beam that impinges the top surface of the flip chip at a detection spot having a predetermined spatial relationship to the predetermined generation spot; an interferometer providing an acoustic waveform of the temporal displacement of the top surface of the flip chip at the detection spot based on the magnitude of a portion of the detection laser beam reflected from the top surface of the flip chip; and an analyzer that compares the acoustic waveforms for a plurality of predetermined generation and detection spots on the top surface of the flip chip to detect the defect in the attachment between the flip chip and the substrate.