How to Document Focused Beam Alignment for Thin-Wall Metal Tubes

https://blogfreely.net/galdurjbvz/pulse-echo-method-choice-for-curved-metal-housings-an-immersion-ut-guide

How to Document Focused Beam Alignment for Thin-Wall Metal Tubes Thin tubes have close front and back surfaces and curved entry paths. A focused transducer can improve response from a limited region when aligned well