[MICROACOUSTIC INSTRUMENTS Inc.]

Micromachined Air-Coupled Capacitance Transducer
Technical Publications

Refereed Journal Publications

D.W. Schindel, D.A. Hutchins, L. Zou and M. Sayer, "The Design and Characterization of Micromachined Air-Coupled Capacitance Transducers," IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, 42(1), pp.42-50, 1995.

D.W. Schindel and D.A. Hutchins, "Applications of Micromachined Capacitance Transducers in Air-Coupled Ultrasonics and Non-Destructive Evaluation," IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, 42(1), pp.51-58, 1995.

D.W. Schindel and D.A. Hutchins, "Through-thickness characterization of solids by wideband air-coupled ultrasound," Ultrasonics, 33(1), pp.11-17, 1995.

W.M.D. Wright, D.W. Schindel and D.A. Hutchins, "Studies of Laser-Generated Ultrasound using a Micromachined Silicon Electrostatic Transducer in Air," Journal of the Acoustical Society of America, 95(5), Pt.1, pp.2567-2575, May 1994.

D.A. Hutchins, W.M.D. Wright and D.W. Schindel, "Ultrasonic measurements in polymeric materials using air-coupled capacitance transducers," Journal of the Acoustical Society of America, 96(3), pp.1634-1642, September 1994.

B. Hosten, D.A. Hutchins and D.W. Schindel, "Measurement of elastic constants in composite materials using air-coupled ultrasonic bulk waves," Journal of the Acoustical Society of America, 99(4) Pt.1, pp.2116-2123, May 1996.

A.G. Bashford, D.A. Hutchins and D.W. Schindel, "Radiated fields of an air-coupled ultrasonic capacitance transducer," Ultrasonics 34(2-5), pp.169-172, 1996.

D.W. Schindel, D.A. Hutchins and W.A. Grandia, "Capacitive and piezoelectric air-coupled transducers for resonant ultrasonic inspection," Ultrasonics, 34(6), pp.621-627, 1996.

A.G. Bashford, D.W. Schindel, D.A. Hutchins and W.M.D. Wright, "Field characterization of an air-coupled micromachined ultrasonic capacitance transducer," Journal of the Acoustical Society of America, vol.101, no.1, pp.315-322, January 1997.

W.M.D. Wright, D.A. Hutchins, D.P. Jansen and D.W. Schindel, "Air-coupled Lamb wave tomography," IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, vol.44, no.1, pp.53-59, January 1997.

D.W. Schindel, D.S. Forsyth, D.A. Hutchins and A. Fahr, "Air-coupled ultrasonic NDE of bonded aluminum lap-joints," Ultrasonics, vol. 35, no.1 pp.1-6, February 1997.

D.W. Schindel, "Air-coupled generation and detection of ultrasonic bulk waves in metals using micromachined capacitance transducers," Ultrasonics, vol. 35, no.2 pp.179-181, March 1997.

D.W. Schindel, A.G. Bashford and D.A. Hutchins, "Focussing of ultrasonic waves in air using a micromachined Fresnel zone-plate," Ultrasonics, vol.35, no.4, pps.275-286, September 1997.

A.G. Bashford, D.W. Schindel and D.A. Hutchins, "Micromachined ultrasonic capacitance transducers for immersion applications," IEEE.UFFC., vol.45, no.2, pp.367-375, March 1998.

D.W. Schindel, "Ultrasonic imaging of solid surfaces using a focussed air-coupled capacitance transducer," Ultrasonics, vol.35, no.8, pp.587-594, March 1998.

D.A. Hutchins, D.W. Schindel, A.G. Bashford and W.M.D. Wright, "Advances in ultrasonic electrostatic transduction," Ultrasonics, vol. 36, nos.1-5, pp.1-6 (1998)

T.J. Robertson, D.A. Hutchins, D.R. Billson, J.H. Rakels and D.W. Schindel, "Surface metrology using reflected ultrasonic signals in air," (to be published).

T.H. Gan, D.A. Hutchins, D.R. Billson and D.W. Schindel, "The use of broadband acoustic transducers and pulse compression techniques for air-coupled ultrasonic imaging," Ultrasonics, (accepted, to be published)

D.W. Schindel, "Air-coupled ultrasonic measurements of adhesively-bonded multi-layer structures," Ultrasonics, 37(3) pp.185-200, March 1999.

D.W. Schindel, A.G. Bashford and D.A. Hutchins, "Chromatic aberration of an air-coupled ultrasonic Fresnel zone-plate," IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, 46(1), pp.242-246, January 1999.

W.M.D. Wright, D.W. Schindel, D.A. Hutchins, D.P. Jansen and P.W. Carpenter, "Ultrasonic tomographic imaging of temperature- and flow- fields in gases using air-coupled capacitance transducers," Journal of the Acoustical Society of America, 104(6), pp. 3446-3455, Dec.1998.

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Conference Publications / Presentations

L. Sun, D.W. Schindel and M. Sayer, "Self-reciprocal calibration of micromachined capacitance transducers in Air," Proceedings of the IEEE 1999 Ultrasonics Symposium, Lake Tahoe, CA, October 18-20, 1999.

D.W. Schindel, "Broadband micromachined capacitance transducers for ultrasonic applications in fluids," Ultrasonics International ’99 joint with 1999 World Congress on Ultrasonics, Technical University of Denmark, Copenhagen, Denmark, June 28-July 1, 1999. (Invited Paper).

C.S. McIntyre, D.A. Hutchins and D.W. Schindel, "Recent developments in air-coupled ultrasonic capacitive transducers for use with NDE experiments," ASA meeting, Seattle WA, USA, 1998.

D.A. Hutchins, W.M.D. Wright, D.W. Schindel and P.W. Carpenter, "Ultrasonic Capacitance Transducers for Imaging Flow and Temperature Fields in Air," ASA meeting, Seattle WA, USA, 1998..

P. Ingleby, T.J. Robertson, D.A. Hutchins and D.W. Schindel, "Ultrasonic air-coupled capacitance transducers using thin mica films," ASA meeting, Seattle WA, USA, 1998..

D.W. Schindel, "Non-contact ultrasonic inspection of aerospace materials using micromachined air-coupled capacitance transducers," Ultrasonics International '97, Delft, The Netherlands, July 4 1997.

D.A. Hutchins, D.W. Schindel and A.G. Bashford, "Advances in ultrasonic electrostatic transduction," Ultrasonics International '97, Delft, The Netherlands, July 2 1997. (Invited Talk)

W.M.D. Wright, D.A. Hutchins, and D.W. Schindel, "Ultrasonic tomographic imaging in air," Ultrasonics International '97, Delft, The Netherlands, July 2 1997.

D.A. Hutchins, A.G. Bashford, W.M.D. Wright, D.W. Schindel and A. Kumar, "Air-coupled ultrasonic capacitance transducers for NDT," World NDT Conference, New Delhi, December, 1996.

B. Hosten, D.A. Hutchins and D.W. Schindel "Air-coupled ultrasonic bulk waves to measure elastic constants in composite materials." Rev. Prog. Quant. Nondestr. Eval., 15A, pps.1075-1082, July 30 - Aug.4, Seattle (1996).

D.W. Schindel, "Air-Coupled Ultrasonic Transducers," an invited talk given at the Ultrasonics International Conference '95, Edinburgh, Scotland, July 1995.

W. Lauriks, B. Castagnede, J. Thoen, W. Wright, D.A. Hutchins and D.W. Schindel, "Determinations of the Tortuosity of porous materials using new air-coupled ultrasonic transducers," 11th International FASE Symposium, pp.11-14, Valencia, November 1994.

D.A. Hutchins and D.W. Schindel, "Advances in Non-contact and Air-coupled Transducers," Proceedings of the IEEE 1994 Ultrasonics Symposium, October 1994.

D.A. Hutchins, W.M.D. Wright, L.P. Scudder and D.W. Schindel, "Air-coupled ultrasonic NDT," p.15, NDT '94 Conference, York, England, 13-15 September, 1994.

D.A. Hutchins, W.M.D. Wright, L.P. Scudder, J.T. Mottram and D.W. Schindel, "Air-Coupled Ultrasonic Testing of Composites," Conference on 'Inspection of structural composites', 9-10 June 1994, University College, London, England.

W.M.D. Wright, D.A. Hutchins and D.W. Schindel, "Ultrasonic evaluation of polymers and composites using air-coupled capacitance transducers," Rev.Prog.Quant.Nondestr.Eval., 14B, pp.1399-1406, July 31 - Aug.5, Snowmass Village, Colorado, 1994.

D.A. Hutchins, A.G. Bashford, W.M.D. Wright and D.W. Schindel, "Characterization of the field of an air-coupled ultrasonic silicon capacitance transducer," Rev.Prog.Quant. Nondestr.Eval., July 31 - Aug. 5, Snowmass Village, Colorado, 1994.

D.W. Schindel, D.A. Hutchins, L. Zou and M. Sayer, "Micromachined Capacitance Transducers for Air-Borne Ultrasonics," Ultrasonics International Conference Proceedings '93, pp.675-678, Vienna, Austria, July 6-8, 1993.

D.W. Schindel, D.A. Hutchins, L. Zou and M. Sayer, "Capacitance Transducers for Generating Ultrasonic Fields in Liquids and Gases," Proceedings of the IEE Conference on 'Acoustic Sensing and Imaging', pp.7-12, conf.publ.#369, London, UK, 29-30 March, 1993.

M. Sayer, D. Barrow, L. Zou, C.V.R. Vasant Kumar, R. Noteboom, D.A. Knapik, D.W. Schindel and D.A. Hutchins, "Piezoelectric and Capacitive Microactuators and Devices," Materials Research Society Symposia Proceedings, vol.310, p.37-39, 1993.

D.W. Schindel, D.A. Hutchins, L. Zou and M. Sayer, "Capacitance Devices for the Generation of Air-Borne Ultrasonic Fields," Proceedings of the IEEE 1992 Ultrasonics Symposium, pp.843-846, Tucson, Arizona, October 20-23, 1992.

D.W. Schindel and D.A. Hutchins, "Capacitive Devices for the Efficient Transduction of Ultrasonic Fields in Air," The 124th Meeting of the Acoustical Society of America, New Orleans, LA, Oct.31 - Nov.4, 1992.

D.W. Schindel and D.A. Hutchins, "Capacitance Devices for the Controlled Generation of Ultrasonic Fields in Liquids," Proceedings of the IEEE 1991 Ultrasonics Symposium, pp.301-304, Lake Buena Vista, Florida, December 1991.

A.G. Bashford, D.W. Schindel and D.A. Hutchins, "Characteristics of Ultrasonic Micromachined Capacitance Transducers in Water," Proceedings of the IEEE 1996 Ultrasonics Symposium, November 1996.

C.S. McIntyre, D.A. Hutchins and D.W. Schindel, "Recent developments in air-coupled ultrasonic capacitive transducers for use with NDE experiments," ASA meeting, Seattle, July 1998.

D.A. Hutchins, W.M.D. Wright, D.W. Schindel and P.W. Carpenter, "Ultrasonic Capacitance Transducers for Imaging Flow and Temperature Fields in Air," ASA meeting, Seattle, July 1998.

P. Ingleby, T.J. Robertson, D.A. Hutchins and D.W. Schindel, "Ultrasonic air-coupled capacitance transducers using thin mica films," ASA meeting, Seattle, July 1998.

M. Sayer, L. Sun and D.W. Schindel, "Modelling and experiments of micromachined air-coupled capacitance transducers," 95th Annual Meeting and Convention of the Canadian Ceramic Society, Montreal, February 23-25, 1997.

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Patents

D.W. Schindel and D.A. Hutchins, "Air-Coupled Ultrasonic Transducer," United States Patent #5,287,331, February 15, 1994.

D.W. Schindel and D.A. Hutchins, "Air-Coupled Ultrasonic Transducer," Canadian Patent #2,105,647, December 14, 1999.

D.W. Schindel and D.A. Hutchins, "Non-Contact Characterization and Inspection of Materials using Wideband Air-Coupled Ultrasound," United States Patent #5,824,908, October 20, 1998.

D.W. Schindel and D.A. Hutchins, "Non-Contact Characterization and Inspection of Materials using Wideband Air-Coupled Ultrasound," Canadian Patent Application #2,169,307, filed February 12, 1996. 

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