This article presents the ultrasound tightening measurement technique
We will be looking at the main principles of the process as well as its numerous industrial applications.
The measurement principle is very simple.
It involves measuring the elongation of the screw or bolt under the effect of the tension applied during tightening. This elongation is proportional to the tension (for the moment let’s imagine the screws stay in elastic domain, we can then calculate the tension by simply applying a coefficient.
The ultrasound sensor is placed on the screw or bolt head and will :
- First function as a sender which transforms the electrical impulse sent by the measurement system into an ultra-sound wave which will propagate lengthwise through the material.
- Then it will function as a receiver which collects the weakened ultrasound wave reflected by the end of the screw and then transform it into an electrical signal which will then be processed by the measurement system.
For each emission, the system will measure the time elapsed between the emission of the impulse and the reception of the echo.