English to Hebrew Tech/Engineering Materials (Plastics, Ceramics, etc.) Ultrasonic Testing

A couplant is a material that serves as a medium for the transmission of sound waves. Usually, couplant gel is a form of water-based substance, or a paste composed of oils or grease-like chemicals. It is placed in physical contact with a transducer that receives audio signals in the air and then coverts them to electrical impulses for transmission.