Homodyne interferometer and method of sensing material
摘要
Faults, dimensions and other characteristics of a material or structure are sensed by a coherent beam's reflection from the material during ultrasonic or very fast vibration. The reflected beam acquires a phase substantially different from its original phase and from the phase of a reference beam split from the common source beam. The reflected beam and the reference beam are superimposed by diffraction in a multiple quantum well adaptive holographic beamsplitter, and the superimposed beams are detected by a photodetector capable of detecting small interference changes from ultrasonic surface displacements or perturbations. An apparatus and method defining an improved homodyne interferometer for performing the method is described.
申请公布号
US5900935(A)
申请公布日期
1999.05.04
申请号
US19970995655
申请日期
1997.12.22
申请人
KLEIN, MARVIN B.;BACHER, G. DAVID;NOLTE, DAVID D.;LAHIRI, INDRAJIT
发明人
KLEIN, MARVIN B.;BACHER, G. DAVID;NOLTE, DAVID D.;LAHIRI, INDRAJIT