Ultrasonic imaging of solid surfaces using a focussed air-coupled capacitance transducer

Ultrasonics

Volumn 35, Issue 8, 1998, Pages 587-594

  Schindel, D W ^a  

^a NATIONAL RESEARCH COUNCIL CANADA   (Canada)

Author keywords

Air coupled; Capacitance transducer; Fresnel zone plate; Imaging; Ultrasound

Indexed keywords

SURFACES; ULTRASONIC TRANSDUCERS; ULTRASONIC WAVES; ULTRASONICS;

CAPACITANCE TRANSDUCER; FRESNEL ZONE PLATE;

ULTRASONIC IMAGING;

EID: 0031700462     PISSN: 0041624X     EISSN: None     Source Type: Journal    
DOI: 10.1016/S0041-624X(97)00094-2     Document Type: Article

References (26)

1. R. Hickling, S.P. Marin, The use of ultrasonics for gauging and proximity sensing in air, J. Acoust. Soc. Am. 79 (4) (1986) 1151.
2. R.W. Smith, R. Walters, J. Carlson, R. Harris, High-frequency acoustic systems for robotic applications, Mat. Eval. 46 (1988) 1262.
3. W.A. Grandia, C.M. Fortunko, NDE applications of air-coupled ultrasonic transducers, Proc. IEEE Ultrason. Symp., 1995, p. 697.
4. L. Capineri, A.S. Fiorillo, L., Masotti, S. Rocchi, Piezo-polymer transducers for ultrasonic imaging in air, IEEE Trans. Ultrason. Ferro. Freq. Contr. 44 (1) (1997) 36.
5. J.S. Shoenwald, Strategies for robotic sensing using acoustics, Proc. IEEE. Ultrason. Symp., 1985, p. 472.
6. 2 transducers for acoustic ranging and imaging in air, Proc. IEEE. Ultrason. Symp., 1983, p. 577.
7. S. Kuroda, A. Jitsumori, T. Inari, Ultrasonic imaging system for robots using an electronic scanning method, Robotica 2 (1984) 47.
8. J. Loschberger, V. Magori, Ultrasonic robotic sensor with lateral resolution, Proc. IEEE. Ultrason. Symp., 1987, p. 547.
9. R. Breeuwer, Ultrasonic scanning, imaging and recognition of bottles, Proc. IEEE Ultrason. Symp., 1989, p. 635.
10. N. Sundstrom, P.O. Borjesson, N.-G. Holmer, L. Olsson. H.W. Persson, Registration of surface structures using airborne focused ultrasound, Ultrasound in Med. & Biol. 17 (5) (1991) 513.
11. L. Mauritzson, J. Ilver, G. Benoni, K. Lindstrom, S. Willner, Two-dimensional airborne ultrasound real-time linear array scanner - applied to screening for scoliosis, Ultrasound in Med. & Biol. 17 (5) (1991) 519.
12. K. Lindstrom, L. Mauritzson, G. Benoni. P. Svedman, S. Willner. Application of air-borne ultrasound to biomedical measurements. Med. & Biol. Eng. & Comput. 20 (1982) 393.
13. T. Gudra, Z. Kojro, M. Schmachtl, C. Lier, M. Schubert, W. Grill, Scanning acoustic air microscope, Ultrasonics 34 (1996) 711.
14. J.D. Fox, G.S. Kino, B.T. Khuri-Yakub, Acoustic microscopy in air at 2 MHz, Appl. Phys. Lett. 47 (5) (1985) 465.
15. C.M. Fortunko, W.P. Dube, J.D. McColskey, Gas-coupled acoustic microscopy in the pulse-echo mode, Proc. IEEE Ultrason. Symp., 1993, p. 667.
16. S.K. Yang, V.V. Varadan, V.K. Varadan, Noncontact thickness measurement of wet-dry paint coatings using an air-coupled transducer, Mat. Eval. 48 (1990) 471.
17. T. Yano, M. Tone, A. Fukumoto, Range finding and surface characterization using high-frequency air transducers, IEEE Trans. Ultrason. Ferro. Freq. Contr. 34 (2) (1987) 232.
18. M. Tone, T. Yano, A. Fukumoto, High-frequency ultrasonic transducer operating in air, Jap. J. Appl. Phys. 23 (6) (1984) L436.
19. C.R. Petts, H.K. Wickramasinghe, Acoustic microscopy in gases. Elect. Lett. 16 (1) (1980) 9.
20. H.K. Wickramasinghe. C.R. Petts, Gas medium acoustic microscopy, in: E.A. Ash (Ed.), Scanned Image Microscopy. Academic Press, London, 1980, p. 57.
21. H.E. Bass, L.C. Sutherland, J. Piercy, L. Evans. Absorption of sound by the atmosphere, Physical Acoustics XVII (1984) 145.
22. D.W. Schindel, D.A. Hutchins, L. Zou, M. Sayer, The design and characterization of micromachined air-coupled capacitance transducers, IEEE Trans. Ultrason. Ferro. Freq. Contr. 42 (1) (1995) 42.
23. D.W. Schindel, D.A. Hutchins, Applications of micromachined capacitance transducers in air-coupled ultrasonics and non-destructive evaluation. IEEE Trans. Ultrason. Ferro. Freq. Contr. 42 (1) (1995) 51.
24. D.W. Schindel, D.A. Hutchins, Air-Coupled Ultrasonic Transducer, U.S. Patent #5 287 331, February 1994.
25. D.W. Schindel, A.G. Bashford, D.A. Hutchins, Focussing of ultrasonic waves in air using a micromachined Fresnel zone-plate. Ultrasonics 35 (4) (1997) 275.
26. D.W. Schindel, A.G. Bashford. D.A. Hutchins, Chromatic aberration of an air-coupled ultrasonic Fresnel zone-plate, IEEE Trans. Ultrason. Ferro. Freq. Contr. (1997) submitted.