Usually the purpose of choosing the coupling agent is:
First, fill the tiny gaps between the contact surfaces, so that the trace air between these gaps does not affect the penetration of ultrasound;
Secondly, through the "transition" effect of the coupling agent, the acoustic impedance difference between the probe and the workpiece is reduced, thereby reducing the reflection loss of ultrasonic energy at this interface;
In addition, it also plays a role of "lubrication" to reduce the friction between the probe surface and the workpiece, so that the probe can flexibly slide and probe.
Under normal temperature conditions, it is very easy to measure the wall thickness and ultrasonic flaw detection of the pipeline with appropriate instruments, but under high temperature conditions, such as measuring high temperature thermal oil, simply use ultrasonic flowmeter for ultrasonic thickness measurement and ultrasonic flaw detection. Becomes very difficult. In the case of high temperature detection, the detection time is very short. The high temperature probe can only stay for a while on the surface of the high temperature measurement workpiece, otherwise there will be a danger of burning the probe, so under such harsh working conditions, there must be a coupling agent that can measure high temperature. To achieve a good coupling between the probe and the workpiece.
The FLEXIM high temperature coupling agent imported from Germany is divided into colloidal and liquid. Its biggest features are: high temperature can be measured at 450 degrees, it is not easy to melt under high temperature, and it slowly dry out. Its ultrasonic sound guiding performance is strong, and its ability to resist noise interference is strong. Corrosive, wash off with clean water after skin contact.
When the high-temperature workpiece is coated with FLEXIM high-temperature coupling agent, not only can the acoustic energy of the workpiece change, but also the sound pressure at a certain depth in the high-temperature workpiece. Therefore, the appropriate high-temperature coupling agent can play a good coupling effect, reduce clutter interference, and improve the accuracy of the ultrasonic flowmeter.
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