Laser induced ultrasonic phased array using full matrix capture data acquisition and total focusing method.

Laser ultrasonics is a technique where lasers are employed to generate and detect ultrasound. A data collection method (full matrix capture) and a post processing imaging algorithm, the total focusing method, both developed for ultrasonic arrays, are modified and used in order to enhance the capabilities of laser ultrasonics for nondestructive testing by improving defect detectability and increasing spatial resolution. In this way, a laser induced ultrasonic phased array is synthesized. A model is developed and compared with experimental results from aluminum samples with side drilled holes and slots at depths of 5 20 mm from the surface. c © 2016 Optical Society of America OCIS codes: (280.3375) Laser induced ultrasonics; (110.5100) Phased-array imaging systems; (120.0280) Remote sensing and sensors; (120.4290 ) Nondestructive testing; (110.7170) Ultrasound. References and links 1. S. J. Davies, C. Edwards, G. S. Taylor, and S. B. Palmer, “Laser generated ultrasound: its properties, mechanisms and multifarious applications,” J. Phys. D Appl. Phys. 26, 329–348 (1993). 2. C. B. Scruby and L. E. Drain, Laser Ultrasonics, Techniques and Applications (Adam Hilger, 1990). 3. P. A. Doyle, “On optical waveform for laser-generated ultrasound,” J. Phys. D Appl. Phys. 19, 1613–1623 (1986). 4. K. L. Telschow and R. J. Conant, “Optical and thermal parameter effects on laser-generated ultrasound,” J. Acoust. Soc. Am. 88, 1494–1502 (1990). 5. L. R. F. Rose, “Point-source representation for laser-generated ultrasound,” J. Acoust. Soc. Am. 75, 723–732 (1984). 6. J. P. Monchalin, “Optical detection of ultrasound,” IEEE T. Ultrason. Ferr. 33, 485–499 (1986). 7. L. S. Wang, J. S. Steckenrider, and J. D. Achenbach, “A fiber-based laser ultrasonic system for remote inspection of limited access components,” in Review of Progress in Quantitative Nondestructive Evaluation, vol. 16 (Plenum, 1997), pp. 507–514. 8. M. Dubois, M. Militzer, A. Moreau, and J. F. Bussiere, “A new technique for the quantitative real-time monitoring of austenite grain growth in steel,” Scripta Mater. 42, 867–874 (2000). 9. K. R. Yawn, M. A. Osterkamp, D. Kaiser, and C. Barina, “Improved laser ultrasonic systems for industry,” in Review of Progress in Quantitative Nondestructive Evaluation, vol. 1581 (AIP, 2014), pp. 397–404. 10. R. E. Lee and R. M. White, “Excitation of surface elastic waves by transient surface heating,” Appl. Phys. Lett. 12, 12–14 (1968). 11. M. Clark, S. D. Sharples, and M. G. Somekh, “Diffractive acoustic elements for laser ultrasonics,” J. Acoust. Soc. Am. 107, 3179–3185 (2000). 12. S. D. Sharples, M. Clark, and M. G. Somekh, “All-optical adaptive scanning acoustic microscope,” Ultrasonics 41, 295–299 (2003). 13. T. Stratoudaki, M. Clark, and M. G. Somekh, “Cheap optical transducers (CHOTS) for generation and detection of longitudinal waves,” in 2012 IEEE International Ultrasonics Symposium (IEEE, 2012), pp. 961–964. 14. A. J. A. Bruinsma and J. A. Vogel, “Ultrasonic noncontact inspection system with optical fiber,” Appl. Optics 27, 4690–4695 (1988). 15. J. Jarzynski and Y. H. Berthelot, “The use of optical fibers to enhance the laser generation of ultrasonic waves,” J. Acoust. Soc. Am. 8, 158–162 (1989). 16. S. N. Hopko, I. C. Ume, and D. S. Erdahl, “Development of a flexible laser ultrasonic probe,” J. Manuf. Sci. E. T. ASME 124, 351–357 (2002). 17. B. Mi and C. Ume, “Real-time weld penetration depth monitoring with laser ultrasonic sensing system,” J. Manuf. Sci. E. T. ASME 128, 280–286 (2006). Vol. 24, No. 19 | 19 Sep 2016 | OPTICS EXPRESS 21921 #268686 http://dx.doi.org/10.1364/OE.24.021921 Journal © 2016 Received 17 Jun 2016; revised 21 Jul 2016; accepted 9 Aug 2016; published 12 Sep 2016 18. C. Pei, K. Demachi, T. Fukuchi, K. Koyama, and M. Uesaka, “Cracks measurement using fiber-phased array laser ultrasound generation,” J. Appl. Phys. 113, 163101 (2013). 19. J. S. Steckenrider, T. W. Murray, J. B. D. Jr., and J. W. Wagner, “Sensitivity enhancement in laser ultrasonics using a versatile laser array system,” J. Acoust. Soc. Am. 97, 273–279 (1995). 20. J. T. W. Murray, J. B. Deaton and J. W. Wagner, “Experimental evaluation of enhanced generation of ultrasonic waves using an array of laser sources,” Ultrasonics 34, 69–77 (1996). 21. M.-H. Noroy, D. Royer, and M. Fink, “The laser-generated ultrasonic phased array: Analysis and experiments,” J. Acoust. Soc. Am. 94, 1934–1943 (1993). 22. M.-H. Noroy, D. Royer, and M. Fink, “Shear-wave focusing with a laser-ultrasound phased-array,” IEEE T. Ultrason. Ferr. 42, 981–988 (1995). 23. A. Blouin, D. Levesque, C. Neron, D. Drolet, and J.-P. Monchalin, “Improved resolution and signal-to-noise ratio in laser-ultrasonics by saft processing,” Opt. Express 2, 531–539 (1998). 24. D. Levesque, A. Blouin, C. Neron, and J.-P. Monchalin, “Performance of laser-ultrasonic F-SAFT imaging,” Ultrasonics 40, 1057âĂŞ1063 (2002). 25. P. D. W. C. Holmes, B. W. Drinkwater, “Post-processing of the full matrix of ultrasonic transmitâĂŞreceive array data for non-destructive evaluation,” NDT&E Int. 38, 701âĂŞ711 (2005). 26. P. D. W. C. Holmes, B. W. Drinkwater, “Advanced post-processing for scanned ultrasonic arrays: Application to defect detection and classification in non-destructive evaluation,” Ultrasonics 48, 636âĂŞ642 (2008). 27. R. M. White, “Generation of elastic waves by transient surface heating,” J. Appl. Phys. 34, 3559–3567 (1963). 28. J. R. Bernstein and J. B. Spicer, “Line source representation for laser-generated ultrasound in aluminum,” J. Acoust. Soc. Am. 107, 1352–1357 (2000). 29. G. F. Miller and H. Pursey, “The field and radiation impedance of mechanical radiators on the free surface of a semi-infinite isotropic solid,” in Proceedings of the Royal Society of London. Series A, Mathematical and Physical Sciences, vol. 223 (Royal Society, 1954), pp. 521–542. 30. J. Zhang, B. W. Drinkwater, and P. D. Wilcox, “Defect characterization using an ultrasonic array to measure the scattering coefïňĄcient matrix,” IEEE T. Ultrason. Ferr. 55, 2254–2265 (2008). 31. A. L. Lopez-Sanchez, H. J. Kim, L. W. Schmerr, and A. Sedov, “Measurement models and scattering models for predicting the ultrasonic pulse-echo response from side-drilled holes,” J. Nondestruct. Eval. 24, 83–96 (2005). 32. E. Glushkov, N. Glushkova, A. Ekhlakov, and E. Shapar, “An analytically based computer model for surface measurements in ultrasonic crack detection,” Wave Motion 43, 458–473 (2006). 33. C. Li, D. Pain, P. D. Wilcox, and B. W. Drinkwater, “Imaging composite material using ultrasonic arrays,” NDT&E Int. 53, 8–17 (2013). 34. S. Raetz, T. Dehoux, and B. Audoin, “Effect of laser beam incidence angle on the thermoelastic generation in semi-transparent materials,” J. Acoust. Soc. Am. 130, 3691âĂŞ3697 (2011). 35. E. Palik, Handbook of Optical Constants of Solids (Academic, 1998). 36. S. C. Wooh and Y. Shi, “Optimum beam steering of linear phased arrays,” Wave Motion 29, 245–265 (1999). 37. G. Rousseau and A. Blouin, “Hadamard multiplexing in laser ultrasonics,” Opt. Express 20, 25798–25816 (2012). 38. J. Davies, F. Simonetti, M. Lowe, and P. Cawley, “Review of synthetically focused guided wave imaging techniques with application to defect sizing,” in Review of Progress in Quantitative Nondestructive Evaluation, vol. 25 (Plenum, 2006), pp. 142–149. 39. P. D. Wilcox, “Ultrasonic arrays in nde: Beyond the b-scan,” in Review of Progress in Quantitative Nondestructive Evaluation, vol. 1151 (AIP, 2013), pp. 33–50. 40. Y.-J. Chen, “Relationship between ultrasonic characteristics and relative porosity in Al and Al-XSi alloys,” Mater. Trans. 50, 2308–2313 (2009). 41. J. Wagner and J. Spicer, “Theoretical noise-limited sensitivity of classical interferometry,” J. Opt. Soc. Am. 4, 1316–1326 (1987). 42. A. M. Aindow, R. J. Dewhurst, D. A. Hutchins, and S. B. Palmer, “Laser-generated ultrasonic pulses at free metal surfaces,” J. Acoust. Soc. Am. 69, 449–455 (1981). 43. J. Wagner, “Breaking the sensitivity barrier: the challenge for laser ultrasonics,” in Proceedings of IEEE Ultrasonics Symposium, vol. 1 and 2 (IEEE, 1992), pp. 791–800. 44. J. P. Monchalin, “Progress towards the application of laser-ultrasonics in industry,” in Review of Progress in Quantitative Nondestructive Evaluation, vol. 11 (Plenum, 1993), pp. 495–506. 45. J. P. Monchalin and R. Heon, “Broadband optical detection of ultrasound by sideband stripping with a confocal Fabry-Pérot,” Appl. Phys. Lett. 55, 1612–1614 (1989). 46. P. Delaye, A. Blouin, D. Drolet, L. A. deMontmorillon, G. Roosen, and J. P. Monchalin, “Detection of ultrasonic motion of a scattering surface by photorefractive inp:fe under an applied dc field,” J. Opt. Soc. Am. 14, 1723–1734 (1997). 47. P. V. Mitchell, G. J. Dunning, S. W. McCahon, M. B. Klein, T. R. OâĂŹMeara, and D. M. Pepper, “Compensated high-bandwidth laser ultrasonic detector based on photo-induced emf in GaAs,” in Review of Progress in Quantitative Nondestructive Evaluation, vol. 15 (Plenum, 1996), pp. 2149–2155. 48. T. W. Murray and S. Krishnaswamy, “Multiplexed interferometer for ultrasonic imaging applications,” Opt. Eng. 40, 1321–1328 (2001). 49. A. I. Bowler, B. W. Drinkwater, and P. D. Wilcox, “An investigation into the feasibility of internal strain measurement Vol. 24, No. 19 | 19 Sep 2016 | OPTICS EXPRESS 21922