Ultrasonic thickness gauge is a widely used non-destructive testing technology, used in petroleum, chemical, metallurgy, shipbuilding, aviation, aerospace and other various fields.

1, general measurement methods:
(1) at a point with a probe for two thickness measurement, in the two measurements in the probe's split surface to each other 90 degree , take the smaller value for the measured thickness of the workpiece value.

(2) 30mm multi-point measurement method: when the measured value is not stable, a measurement point as the centre, in a circle of about 30mm in diameter for a number of measurements, take the * small value for the measured thickness of the workpiece value.

2,Precision Measurement Method: Increase the number of measurements around the specified measurement point, and the thickness change is indicated by the equal thickness line.

3, continuous measurement method: single-point measurement method along the specified route for continuous measurement, the interval is not more than 5mm.

4, grid measurement method: in the specified area on the grid, according to the point thickness measurement record. This method is widely used in high-pressure equipment, stainless steel lining corrosion monitoring.