Measuring and testing – Vibration – By mechanical waves
Patent
1990-10-15
1992-03-31
Williams, Hezron E.
Measuring and testing
Vibration
By mechanical waves
73643, G01N 2900
Patent
active
050996932
ABSTRACT:
An apparatus for investigating a sample with ultrasound has a probe head formed by a casing, a transducer element of piezoelectric plastics material, and a source for applying a high frequency pulse to the sample. The source is preferably one end of an optical fibre, which fibre extends to a laser remote from the probe head. The transducer element is connected to the sample by an acoustic coupling medium, e.g. water. Thus, the probe head can be moved relative to the sample, and a compact, but efficient, structure is achieved.
REFERENCES:
patent: 4137991 (1979-02-01), Melcher et al.
patent: 4379409 (1983-04-01), Primbsch et al.
patent: 4683750 (1987-08-01), Kino et al.
"Laser Generation of Directional SAW Pulses in Metals", by Aindow et al., Optics Communications, vol. 42, No. 2, Jun. 1982.
Aindow, A. M. et al., The Efficient Production of Acoustic Pulses at Free Metal Surfaces by Q-Switched Lasers, Proc. of the 4th Nat. Quant. Electronics Conf., 19-21 Sep. 1979, pp. 255-258.
Hutchins, D. A. et al., Laser Generation of Longitudinal and Shear Pulses in Metals, Proc. of the Inst. of Acoustics, 8-11 Apr., 1980, pp. 281-285.
Aindow, A. M. et al., The Laser-Generation of Surface Elastic Waves at Free Metal Surfaces, Porc. of the Inst. of Acoustics, 8-11, Apr. 1980, pp. 277-280.
Scruby, C. B. et al., Quantitative Studies of Thermally-Generated Elastic Waves in Laser-Irradiated Metals, J. Appl. Phys., 51, pp. 6210-6216, 1980.
Aindow, A. M. et al., Characteristics of a Laser-Generated Acoustic Source in Metals, Proc. of 1980 Euro. Conf. on Optical Systems and Applications, SPIE, vol. 236, pp. 478-485, 1980.
Aindow, A. M. et al., Laser-Generated Ultrasonic Pulses at Free Metal Surfaces, J. Acoust. Soc. Amer., 69, pp. 449-455, 1981.
Scruby, C. B. et al., A Laser-Generated Standard Acoustic Emission Source, Materials Evaluation, 39, pp. 1250-1254, 1981.
Hutchins D. A. et al., Estimation of Liquid Depth by Laser Generation of Ultrasound, Acoustic Letters, 4, pp. 96-99, 1980.
Hutchins, D. A. et al., Laser Generation as a Standard Acoustic Source in Metals, Appl. Phys. Lett., 38, pp. 677-679, 1981.
Hutchins, D. A. et al., Mechanisms of Laser-Generated Ultrasound by Directivity Pattern Measurements, Proc. of Ultrasonics, 1981, 30 Jun.-2 Jul., pp. 20-25.
Scruby, C. B. et al., Quantitative Studies of Laser-Generated Acoustic Waveforms, Proc. of Ultrasonics, 1981, 30 Jun.-2 Jul., pp. 129-134.
Dewhurst, R. J. et al., Quantitative Measurements of Laser-Generated Acoustic Waveforms, J. Appl. Phys., 53, pp. 4064-4071, 1982.
Hutchins, D. A. et al., Some Applications of Laser-Generated Ultrasound in Metals, Proc. IEEE, 1981, Ultrasonic Symposium, pp. 798-801.
Hutchins, D. A. et al., Directivity Patterns of Laser-Generated Ultrasound in Aluminum, J. Acoustic, Soc. Amer., 70, pp. 1362-1369, 1982.
Aindow, A. M. et al., Laser-Generation of Directional Surface Acoustic Wave Pulses in Metals, Opt. Comm., 42, pp. 116-120, 1982.
Scruby, C. B. et al., Laser-Generation of Ultrasound in Metals, Research Techniques in Non-Destructive Testing, vol. v, Chp. 8, pp. 284-327, Academic Press, 1982.
Aindow, A. M. et al., The Physics of Laser-Generated Surface Acoustic Waves in Metals, Quantum Elevtronics and Electro-Optics, ed. P. L. Knight, John Wiley, pp. 427-430, 1983.
Dewhurst, R. J. et al., The Performance of Thick Piezoelectric Transducers as Wideband Ultrasonic Detectors, Ultrasonics, 21, pp. 79-84, 1984.
Aindow, A. M. et al., Crack Depth Estimation Using Wideband Laser Generated Surface Acoustic Waves, Proc. of Ultrasonics International '83, (Halifax, Canada), pp. 20-24.
Dewhurst, R. J., A Hand-Held Laser-Generator of Ultrasonic Pulses, Non-Destructive Testing Communications, 1, pp. 93-104, 1983.
Aindow, A. M. et al., Laser-Based Non-Destructive Testing Techniques for the Ultrasonic Characterisation of Sub-Surface Flaws, NDT International, 17, pp. 329-335, 1984.
Cooper, J. A. et al., The Application of Laser-Generated Ultrasound to the Remote Testing of Laminar Defects, Proc. of Ultrasonics International '85 (Brighton, UK), pp. 207-212.
Crosbie, R. A. et al., Flexural Resonance Measurements of Clamped and Partially Clamped Discs, Excited by Nanosecond Laser Pulses, J. Appl. Phys. 59, pp. 1843-1848, 1986.
Cooper, J. A. et al., Characterisation of Surface Breaking Defects in Metals Using Laser-Generated Ultrasound, Phil. Trans. Roy. Soc. London, Series A, 320, pp. 319-328, 1986.
Cooper, J. A. et al., Surface Acoustic Wave Interactions With Cracks and Slots: A Noncontacting Study Using Lasers, IEEE Trans. in Ultrasonics, Ferroelectrics and Frequency Control, UFFC-33, pp. 462-470, 1986.
Dewhurst, R. J. et al., Further Evidence for Two-Component Surface Acoustic Wave Reflections from Surface-Breaking Slots, Appl. Phys. Lett., 49, pp. 1694-1695, 1986.
Dewhurst, R. J. et al., Non-Contact Detection of Surface-Breaking Cracks Using a Laser Acoustic Source and An Electromagnetic Acoustic Receiver, Appl. Phys. Lett., 49, pp. 374-376, 1986.
Dewhurst Richard J.
Payne Peter A.
Arana Louis M.
Cogent Limited
Williams Hezron E.
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