Ultrasonic Thickness Gauge
A Ultrasonic Thickness Gauge is a device that measures the thickness of a layer with ultrasonic waves. Ultrasonic waves are imparted into the layer being measured via a piezoelectric transducer. The waves travel through the layer at a material dependent, but constant speed. When the wave reaches the layer interface, it is reflected back towards the transducer. Once calibrated, layer thickness corresponds to the time it takes for the wave to travel through the layer and return to the transducer. Ultrasonic thickness gauges are non-destructive and only require access to one side of the layer being measured.
