－
27
－
Example of Couplants on the Market.
Company name
Magnaflux company
Registered trademark
ULTRAGEL II , HIGH Z , SONO
5-5. Measurement Principle
When the ultrasonic wave is transmitted from the transmitter element
of the transducer, the ultrasonic wave pulse "
T
pulse" is inputted into
the material, and the ultrasonic wave pulse "Echo
B
" is reflected at the
bottom, and is received at the receiver element which is then amplified
as an electric signal. The ultrasonic thickness gage measures the time
length between "
T
pulse" and "Echo
B
", and deducts a delay time of
the delay material, and allows the thickness to be converted and
displayed. The calculation formulas are as follows:
H
: The thickness of the material
v
: The sound velocity of the material
t
: The time between inputting the ultrasonic wave and
reflecting it at the bottom and receiving it as a echo.
H
=
v
x
t
2
Transducer
Acoustic barrier "Gap"
Material
Receiver element
to convert the ultrasonic wave to
an electric signal.
Echo
B
Pulse
T
Thickness
H
Transmitter element
to convert the electric signal to
an ultrasonic wave.
Delay material
