Thus, we need to be selective in choosing a couplant
when high frequency response is sought.
By tapping a hole at the end of the sticker, we were able to screw in the bolt with grease couplant
on the end, and lock it in place.
In the contact method (also known as the pulse-echo method), an ultrasonic probe (transducer) is pressed against the casting surface with a couplant
to maintain a good contact between the casting and the transducer, which sends and receives sound signals.
The method was fast, simple, and did not require a liquid couplant
to transmit the waves.
Each model includes a transducer assembly, interconnecting cable, couplant
, rechargeable battery pack, universal mains supply, metal case, and instruction manual.
But ultrasonic tools cannot be used at all because of the absence of couplant
in the pipeline.
Using water as a couplant
, the ultrasonic, nondestructive tool "looks under the skin" of aircraft fuselages and wings for corrosion, bonding failures, and other defects.
Some of the topics covered included the relative cost-effectiveness of viscosity-reducing surface treatments on alumina trihydrate (ATH) of different particle sizes; effectiveness of different grafted polyolefins in coupling glass and PP; surface-treated microspheres as polymer blend compatibilizers; reground thermosets as low-cost fillers in polyolefins; property enhancement through coupling of natural cellulose-derived fillers in thermoplastics-including recycled materials; and a simple, new method of calculating how much couplant
is just enough.
Namely, [[beta]'.sub.E0] > [[beta]'.sub.p0], compared with what constitutes the two relative nonlinear coefficients, it is the contact nonlinearity (the influence of couplant
and rough surface) which mainly causes the decrease in relative nonlinear coefficients.
Vaseline petroleum gel was used as couplant
. In the following, we present the Choi-Williams transform applied on the KRN sensor output for each waveguide examined.
The UT pig was then propelled using base oil which serves as a couplant
in ultrasonic testing.