There is somebody know a ultrasonic system/device to scan the internal structure of a ceramic body (slip, green body or fired body) in Vitreous China or Fine Fireclay to search crack or air bubbles?
I don't think any of these state that they are specifically for ceramic but I have a few links to ultrasonic flaw detectors that should work for what you need.
You may need to create a free account to see this, but you can see the products by specs, there are 23 products listed.
You can also search by google I would search under "ultrasonic flaw detector" but you will basically get the same companies you get from the link above.
Below are some links to a few other companies that sell the product you are looking for.