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1055 views Technical Discussions Divey Saini Divey Saini 02:28 Nov-01-2001 Utrasonic sensors Could someone suggest me which ultrasonic transducers would be suitable for me for inspection of metal panels with coatings to observe rayleigh waves propagation through it? Also where I could procure them?    Reply  Translate  Close   Dr. Patel R & D, Consultant to Universities/Industries Fallon Ultrasonics/McMaster University, Canada, Joined May 2001, 20 Dr. Patel R & D, Consultant to Universities/Industries Fallon Ultrasonics/McMaster University, Canada, Joined May 2001 20 06:45 Nov-01-2001 Re: Utrasonic sensors : Could someone suggest me which ultrasonic transducers would be suitable for me for inspection of metal panels with coatings to observe rayleigh waves propagation through it? Also where I could procure them? . We have made many cylindrical and spherical focus with almost zero aberation focused transducer for generating Rayliegh waves (20-30 MHz). We are using these transducers to obtain C-Scan images in terms of Rayleigh and Lcr Velocities for obtianing surface charectristics. If you are interested than we please contact us. There are simpler ways of obtianing Rayleigh wave or Lcr wave by using correct angle wedges. Regards Dr. Patel Fallon Ultrasonics Inc. 3 Benemar Court Hamilton, Ont Canada L8W 2R1 Email: fallon@netcom.ca    Reply  Translate  Close   Kelly Phelps Consultant, IT Manager/Marketing Manager NDT Engineering Corporation, USA, Joined Oct 2001, 6 Kelly Phelps Consultant, IT Manager/Marketing Manager NDT Engineering Corporation, USA, Joined Oct 2001 6 06:18 Nov-02-2001 Re: Utrasonic sensors : : Could someone suggest me which ultrasonic transducers would be suitable for me for inspection of metal panels with coatings to observe rayleigh waves propagation through it? Also where I could procure them? It is important to know what type of coatings you speak of as well as how thick. It the coating is to "soft" it most likely will attenuate the sound to the point where there will be no detectable wave. 1) What type of coating. 2) How thick is the coating. 3) What is the condition of the coating in terms of hardness. Kelly Phelps NDT Engineering Corp. Seattle, Wa. 253-872-3565 k.phelps@ndteng.com    Reply  Translate  Close   Ken Camplin , Joined , Ken Camplin , Joined 00:32 Nov-02-2001 Re: Utrasonic sensors : : : Could someone suggest me which ultrasonic transducers would be suitable for me for inspection of metal panels with coatings to observe rayleigh waves propagation through it? Also where I could procure them? . : It is important to know what type of coatings you speak of as well as how thick. It the coating is to "soft" it most likely will attenuate the sound to the point where there will be no detectable wave. . : 1) What type of coating. : 2) How thick is the coating. : 3) What is the condition of the coating in terms of hardness. . : Kelly Phelps : NDT Engineering Corp. : Seattle, Wa. : 253-872-3565 : k.phelps@ndteng.com . EMAT (Electro Magnetic Acoustic Transducers) may offer a solution. Since the ultrasonic wave is generated in the test piece, and not the probe, EMATs successfully generate ultrasound beneath coatings, with no attenuation effects from the coating. Certainly design of the EMAT will take into consideration the coating thickness andmaterial. We have fielded automated Rayleigh wave EMAT systems in excess of 10 MHz for very good sensitivity. You can learn more about EMAT systems at www.innerspec.com. Ken Camplin Innerspec® Technologies Tel: 434.948.1302 krcamplin@innerspec.com    Reply  Translate  Close   Divey Divey 01:21 Nov-03-2001 Re: Utrasonic sensors I am interested in finding the defects in metals and the coatings on it. The metal I am planning to use could be aluminum and an acrylic powder coating on it. The coating after cure will be about 100 µm. The defects could be due to cracks or corrosion pinholes. I would be obliged if you could tell me what approach should I use for my application. Ultrasonic looks as one of the viable solution. I plan to use phased array transducers and study the effect of beam through infected metal. Thanking you    Reply  Translate  Close   Ken Camplin , Joined , Ken Camplin , Joined 05:12 Nov-05-2001 Re: Utrasonic sensors : I am interested in finding the defects in metals and the coatings on it. The metal I am planning to use could be aluminum and an acrylic powder coating on it. The coating after cure will be about 100 µm. The defects could be due to cracks or corrosion pinholes. : I would be obliged if you could tell me what approach should I use for my application. Ultrasonic looks as one of the viable solution. I plan to use phased array transducers and study the effect of beam through infected metal. : Thanking you . Another option that would work well for your application is EMATs (Electro Magnetic Acoustic Transducers). EMAT is an ultrasonic inspection, but since the ultrasound is generated in the conducting test material itself, there are no attenuation effects from the coating, as well no couplant to complicate the test results. Depending on the exact application, you could generate shear, surface, lamb, etc waves for the appropriate level of sensitivity and best orientation for detection. You can learn more about EMAT systems at www.innerspec.com.    Reply  Translate  Close

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