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couplant

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couplant [′kəp·lənt]
(engineering)
A substance such as water, oil, grease, or paste used to avoid the retarding of sound transmission by air between the transducer and the test piece during ultrasonic examination.
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A high-resolution linear array transducer of 7-13 MHz with a relatively small footprint is ideal, using acoustic gel as the couplant, but such transducers have only 4-5 cm depth of penetration.
Ultrasound--first imaging modality in the detection of parathyroid ... by Ahmed, R.; Khan, N.; Ellemdin, S.; Gayaparsad, Keshree / South African Journal of Radiology
The first reflection is from the interface between the water couplant and top surface of the PEM.
Simultaneous acoustic imaging and surface mapping: combining the ... by Adams, Tom / Circuits Assembly
Pulse-echo In the contact method (also known as the pulse-echo method), an ultrasonic probe (transducer) is pressed against the casting surface with a couplant to maintain a good contact between the casting and the transducer, which sends and receives sound signals.
Sound advice for nodularity testing by Alagarsamy, Al / Modern Casting
 
 
 
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