In immersion testing, what is the term for the accessory equipment to which the search cable and the search unit are attached?

• A. Crystal collimator
• B. Scrubber
• C. Jet stream unit
• D. Search tube or scanning tube

Answer: (D)

In immersion testing, the transducer and its search cable are mounted in a dedicated tube that guides and supports the probe as you scan. This accessory is called the search tube, also known as the scanning tube. It provides the water path and stable mounting needed for consistent coupling, standoff, and alignment while moving the probe over the test surface. The other items listed aren’t used to attach or guide the search cable and unit in immersion UT.