How to calibrate ultrasonic thickness gauge？

Ultrasonic thickness gauges work by producing an ultrasonic signal and precisely timing the signal at the transmitting and receiving sites to determine the thickness of a test sample. However, the thickness gauge must be set up for the test sample's sound velocity in order to provide an entirely correct result. Additionally, all necessary zero offsets for the instrument, echo shape, and transducer type are put up along with this setup.

So, to put it briefly, calibration is the process of determining the accuracy of an ultrasonic measuring tool and correcting it. Since various materials require different calibrations, the thickness gauge's memory may store and retrieve the calibration values for each material as needed.

For a number of reasons, ultrasonic thickness gauges need to be calibrated. The most crucial of these justifications is to make sure that the readings' accuracy complies with acknowledged and acceptable criteria. But this is only the very top of the iceberg.

The accuracy of ultrasonic thickness gauges is dependent on a number of characteristics, therefore if the measurements are inaccurate, the parameters will also be inaccurate. Numerous ultrasonic examinations frequently take into consideration certain factors, such as density, angle, shape, size, connection, etc. Additionally, by sending and receiving high-frequency sound waves through the test material, ultrasonic equipment may detect corrosion and erosion of test materials. Consequently, it's possible that uncalibrated ultrasonic thickness gauges can't detect these material decreases.

During the calibration process of the ultrasonic thickness gauge, the following issues should be paid attention to:

• Before calibration, check whether the numbers on the host display are clear to avoid shortages, hidden lights, etc.;

• Keep the appearance of the standard block clean, without any appearance defects that affect the accuracy, such as rust;

• The use of couplant, pay attention to the couplant should not be too small, it needs to cover the probe area;

• During the calibration process, keep the probe tightly attached to the standard block and keep it still to ensure the accuracy of the data.

Standards generally refer to absolute references against which other measurements can be compared. This is no different than ultrasonic thickness gauges as they need to be compared to some standard or absolute value to determine their correctness and consistency.

Therefore, ultrasonic thickness gauge calibration standards are essential tools for accurate calibration operations. These standards come in different shapes and sizes, and they also depend on the application, shape and structure of the object being evaluated. A key requirement is that the standard material must be identical to the material being tested. 

This will help determine the accuracy of the calibration and the defects you intend to detect, including corrosion, wear or erosion. Nonetheless, there are many calibration standards that conform to recognized authorities, documents or specifications that are commonly used for the calibration of thickness gauges in general. However, specially designed standards can also exist to meet specific calibration needs.

In summary, measurement systems and equipment must be calibrated to make precise and accurate measurements or readings. Without arguing whether measurements can still not be taken without calibration, readings may be slightly inaccurate and analysis will still be limited if not calibrated.

Finally, ultrasonic thickness gauge standards and charts are also necessary for the calibration process, and different standards apply to different calibration measures. But here's the truth: the material of the standard used must match the material being inspected.

With this wealth of information at your disposal, the calibration of an ultrasonic thickness gauge should not cause you any headaches.