Optics: measuring and testing – By polarized light examination – With birefringent element
Patent
1991-07-08
1993-07-20
Turner, Samuel A.
Optics: measuring and testing
By polarized light examination
With birefringent element
356358, 356352, 73655, 73657, G01B 1116
Patent
active
052298329
ABSTRACT:
A dual-interferometer apparatus for simultaneously measuring in-plane and out-of-plane ultrasonic displacements of the surface of materials comprising a single laser source, optical fibers, optical couplers and dividers, a phase-conjugate mirror, and a path length stabilizing system including a piezoelectric compensator. The present invention is unique in providing for the automatic alignment of the beams of the two interferometers, thus eliminating the need for time-consuming alignment procedures. The automatic alignment of the interferometers is achieved because a phase conjugate mirror is used to generate a counterpropagating beam used by both interferometers, and because the beams for the out-of-plane interferometer are derived from the beams used for the in-plane interferometer.
REFERENCES:
patent: 4928527 (1990-05-01), Burger et al.
patent: 4966459 (1990-10-01), Monchalin
patent: 5080491 (1992-01-01), Monchalin et al.
J. P. Monchalin, "Optical Detection of Ultrasound," 1986, pp. 485-499, IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, UFFC-33.
J. P. Monchalin, "Measurement of In-plane and Out-of-Plane Ultrasonic Displacements by Optical Heterodyne Interferometry," 1989, pp. 1-28, Journal of Nondestructive Evaluation, Special Issue on Optical Methods.
M. Paul, B. Betz and W. Arnold, "Interferometric Detection of Ultrasound at Rough Surfaces Using Optical Phase Conjugation," 1987, pp. 1569-1571, Applied Physics Letters.
J. W. Wagner and J. B. Spicer, "Theoretical Noise-limited Sensitivity of Classical Interferometry," 1987, pp. 1316-1326, Journal of the Optical Society of America B, vol. 4.
A. Kersey, F. Buchholtz and A. Dandridge, "New Nonlinear Phase Transduction Method for DC Measurand Interferometric Fibre Sensors," 1986, pp. 75-76, Electronics Letters, vol. 22.
C. D. Butter and G. B. Hocker, "Fiber Optics Strain Gauge," 1978, pp. 2867-2969, Applied Optics, vol. 17.
Y. Hirose and Y. Tsuzuki, "Measurement Method of VHF Elastic Vibrations by Optical Fiber Interferometric Sensing," 1989, pp. 360, 362, 364, 43rd Annual IEEE Symposium on Frequency Control.
Ultra Optec, Inc.'s Instructions Manual OP-35-I/O, "Optical Probe for Ultrasound Detection".
J. Feinberg, "Optical Phase Conjugation in Photorefractive Materials," 1983, pp. 417-443, Chapter 11, Academic Press.
A. D. W. McKie and J. W. Wagner, "Optical Sensing of In-Plane Ultrasonic Transients," 1988, pp. 1043-1044, Applied Physics Letters, vol. 53.
T. D. Dudderar, C. P. Burger, J. A. Gilbert, J. A. Smith and B. R. Peters, "Fiber Optic Sensing for Ultrasonic NDE," 1987, pp. 135-146, Journal of Nondestructive Evaluation, vol. 6.
Industrial Quality, Inc.
Keesee La Charles
Turner Samuel A.
LandOfFree
Optical ultrasonic material characterization apparatus and metho does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Optical ultrasonic material characterization apparatus and metho, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical ultrasonic material characterization apparatus and metho will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1764566