Transducer Coupling
A probe coupling is a mechanism that provides fluid contact between a probe and a component to minimize the air gap and ensure sound transmission.
Physical-Chemical Mechanism of Action
A probe coupling uses a fluid medium (like water or oil) injected into the space between the probe and the workpiece. This liquid medium ensures there are no air bubbles between the two surfaces, which improves sound transmission.
Metallurgical Relevance & Welding Risks
Poor contact or too large an air gap can distort the sound signal, leading to incorrect test results. This can cause quality assurance failures and let potential defects slip through.
Workshop Practice & Action Instructions
Make sure the fluid medium is fully injected and all air bubbles are removed. The volume of the medium should be chosen so it covers the entire contact area. Regularly check the integrity of the coupling and watch for any leaks or cracks in the system.