Everything Couplant (1)

Question 1

What is Couplant used for?

Answer 1

Main function is to eliminate air between the probe and the surface of test material.

• Fill irregularities
• Protect probe
• Aid in probe movement

Question 2

Couplants Must

Answer 2

• not harm the part
• completely contact both the probe and test surface
• be free of air bubbles
• have an Acoustic Impedance between the crystal and test specimen to minimize reflection
• be easy to apply and remove
• uniform in thickness and composition

Question 3

Typical Couplants

Answer 3

• Water
• Gels
• Pastes
• Grease
• Some solids (rubber)