{"id":290,"date":"2025-10-02T12:08:36","date_gmt":"2025-10-02T18:08:36","guid":{"rendered":"https:\/\/thesinewave.com\/home\/?page_id=290"},"modified":"2025-10-02T12:39:30","modified_gmt":"2025-10-02T18:39:30","slug":"the-probe","status":"publish","type":"page","link":"https:\/\/thesinewave.com\/home\/the-probe\/","title":{"rendered":"THE PROBE"},"content":{"rendered":"\n

There is a lot of discussion around the T-800 performing examinations on highly attenuative material, such as Cast Austenitic Stainless Steel (CASS). However, true to the nature of ultrasound, applications are generally solved with the transducer.<\/p>\n\n\n\n

CASS offers us a great example. This is due to the fact that it has been studied for over 50 years with no real solution presenting itself. There has been a great deal written about what works, and what doesn\u2019t, over the years. After decades of research, we have come to understand that to go deeper in thickness, for the 2.5\u201d to 3.5\u201d T being 28\u201d \u2013 34\u201d in diameter piping, the only probes that work are very large and low frequency. The ADAMS document ML19255J8141<\/sup> spells this out very clearly.<\/p>\n\n\n\n

Using what we know about the grain structure of this material, and no small amount of experience from close friends, who are probe designers and engineers, we started looking at the problem. Rather than just building huge probes and saying, \u201chere you go\u201d, we took the approach of looking at what it would take to get enough sound energy through the material and back to the receiver. There were a lot of questions that came to mind.<\/p>\n\n\n\n

The fact that it was going to be large and low frequency was a given. Once we settled on the size of 34mm x 64mm in 0.5MHz we realized that we probably didn\u2019t have enough energy required (i.e., pulser voltage) to efficiently drive a probe such as this.<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

To look into what we actually needed for this probe we took what we knew about current probes. Its arguable, but one of the most efficient probes available is a 0.5\u201d round 5MHz. So, we modeled one, scaling up in size, and down in frequency. It wasn\u2019t exactly science, but it didn\u2019t matter. We found out 3 things really fast:<\/p>\n\n\n\n

    \n
  1. In theory this probe can consume more energy that we can feed it, without breaking it.<\/li>\n\n\n\n
  2. 800V is about the practical limit. This is also due to heat generation and dissipation.<\/li>\n\n\n\n
  3. There wasn\u2019t an off-the-shelf instrument that can pulse that high of voltage and hold the pulse duration we were looking for. \u2013 especially in a negative square wave pulse.<\/li>\n<\/ol>\n\n\n\n

    This is how the T-800 was born. We actually had to make our own pulser that could accomplish what we needed it to do. There is no off-the-shelf equipment that can accomplish this. It works exactly as planned. We are now able to drive these probes, and it\u2019s a beautiful thing.<\/p>\n\n\n

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    \"\"<\/figure>\n<\/div>\n\n
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    \"\"<\/figure>\n<\/div>\n\n
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    \"\"<\/figure>\n<\/div>\n\n\n

    <\/p>\n","protected":false},"excerpt":{"rendered":"

    There is a lot of discussion around the T-800 performing examinations on highly attenuative material, such as Cast Austenitic Stainless Steel (CASS). However, true to the nature of ultrasound, applications are generally solved with the transducer. CASS offers us a great example. This is due to the fact that it has been studied for over … <\/p>\n

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