If you want to know the working principle of ultrasonic thickness gauge, you will know why coupling agent is used. Ultrasonic thickness gauge measures thickness based on the principle of ultrasonic pulse reflection. When the ultrasonic pulse emitted by the probe passes through the When the measured object reaches the material interface, the pulse is reflected back to the probe to determine the thickness of the material being measured by accurately measuring the time it takes for the ultrasonic wave to propagate in the material.

Ultrasonic waves will attenuate rapidly when encountering air. In order to discharge the air between the ultrasonic probe and the workpiece, ultrasonic coupling agent is used to remove it.

Coupling agent is used to transmit high-frequency ultrasonic energy between the ultrasonic thickness gauge probe and the material being measured. If you choose the type or use it improperly, it may cause errors or the coupling mark will flash, making it impossible to measure the value. Coupling agent should be used in appropriate amounts and applied evenly. It is important to choose the appropriate type of coupling agent. When used on smooth material surfaces, low viscosity coupling agents (such as randomly configured coupling agents, light engine oil, etc.) are very suitable. When used on rough material surfaces, or vertical surfaces When reaching the top surface, a coupling agent with a higher viscosity (such as glycerin paste, butter, grease, etc.) can be used. When measuring high-temperature workpieces, use high-temperature probes and corresponding high-temperature couplant. Beijing Kaida Instrument