DMTA-20073-01EN, Rev. C, November 2015
Preparing the RollerFORM Liquid Chamber
47
Figure 3-5 Measuring the gap between the acoustic wheel flange and the surface
3.2 Removing Air Bubbles from the Liquid Chamber
If one or more bubbles appears in the liquid chamber during inspection, the
RollerFORM’s acoustic wheel is equipped with a trap that conceals bubbles. The
bubble trap is located in the flange on the probe-cable side.
When scanning a surface with the RollerFORM held upside down, it is mandatory to
remove all air bubbles from the liquid chamber. Any free bubbles will gather together
in the upper part of the chamber between the probe elements and the surface to
inspect, which will interfere with the propagation of ultrasound waves, thus
preventing proper operation of the probe.
2 mm to 3 mm gap (0.08 in. to 0.12 in.)
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