Method and system for inspecting a surface of an object with las

Details Method and system for inspecting a surface of an object with las Method and system for inspecting a surface of an object with las

1996-07-26

1998-06-02

Font, Frank G.

Optics: measuring and testing

By polarized light examination

With birefringent element

356432T, 356345, G01B 902

Patent

active

057609047

ABSTRACT:
The present invention discloses a method and system for inspecting a surface of an object with laser ultrasound. In the present invention, the surface is scanned with a source laser emitting a laser beam at a plurality of scanning positions. The emitted laser beam generates surface or Lamb waves at the plurality of scanning positions and transmits the waves throughout the surface. The surface of the object is scanned with a detector laser emitting a laser beam onto the object surface at the plurality of scanning positions. Surface displacement produced by the waves reflected from the surface is detected with a detector at each scanning position. The detected displacement at each scanning position contains signals representing a laser ultrasound waveform data set corresponding to a two-dimensional surface region along the object. The laser ultrasound waveform data sets at each scanning position are processed with a synthetic aperture focusing technique in order to generate high resolution images. The images are then inspected for defects that include cracks, disbonds, and corrosion.

REFERENCES:
patent: 5546187 (1996-08-01), Pepper et al.
"Air-Coupled Piezoelectric Detection of Laser-Generated Ultrasound" by DA Hutchins, et al, IEEE Trans. On Ultrasonics, Ferroelectrics, & Frequency Control, vol. 41, No. 6, Nov. 1994 pp. 796-805.
"Differential Fibre-Optic Sensing of Laser-Generated Ultrasound" by BA Williams, et al, Electronic Letters, vol.31, No. 5, Mar. 1995 pp. 391-392.
"Laser-Based Ultrasound Arrays for Generation and Detection of Narrowband, Single Mode Lamb Waves", by RC Addison, Jr., et al, 1994 Ultrasonics Symposium, pp. 1201-1204.
"Lamb Wave Tomography" by DP Jansen, et al, 1990 Ultrasonics Symposium, pp. 1017-1020.
"Non-Contact Lamb Wave Tomography" by DA Hutchins, et al, 1992 Ultrasonics Symposium, pp. 883-886.
"Characterization and Imaging with Lamb Wave Lens at Gigahertz Frequencies" by A. Bozkurt, et al, 1994 Ultrasonics Symposium, pp. 1417-1420.
"Advances in Air Coupled NDE for Rapid Scanning Applications" by R. Farlow, et al, 1994 Ultrasonics Symposium, pp. 1099-1102.
"Three Dimensional Ultrasonic Imaging Employing a Time-Domain Synthetic Aperture Focusing Technique" by J. Waszak, et al, IEEE Transactions On Instrumentation and Measurement, vol. 39, No. 2, Apr. 1990, pp. 441-444.
"Improved Imaging with Multi-Saft" by M. Lorenz, et al, 1990 Ultrasonics Symposium, pp. 1123-1128.
U.S. Patent Application, "Method and System for Laser Ultrasonic Imaging of an Object" by Peter W. Lorraine, et al, Ser. No. 08/627670 (Attorney Docket RD-24,725) Filed Apr. 1, 1996.

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