4
TN_EE-BA-e-2020
1.3 Measuring principle
The Ultrasonic Digital Material Thickness Gauge measures the thickness of a part or
structure by accurately measuring the time taken for a short ultrasonic pulse to pass
through the thickness of a material, controlled by a transducer, then reflected from the
back or inner surface and returned to the transducer.
This measured two-way transmission time is divided by 2 (representing the outward
and return paths), and then multiplied by the sound velocity of the corresponding
material. The result is expressed by the following formula:
2
t
v
H
=
H = Material thickness of the test object
V = sound velocity of the corresponding material
t = the measured transit time for the sound
1.4 Configuration
No
Element
Qu
ant
ity
Comment
Standard
configuration
1
Unit- Main body
1
2
Sensor P5EE,
5 MHz, Ø 10 mm
1
3
Coupling means
1
4
Measuring instrument bag
1
5
Operating instructions
1
6
Alkaline batteries
2
AA
Optional configuration
7
Software for data storage
(ATU-04)
1
8
Sensor 2.5 MHz, Ø 14 mm:
ATU-US01
1
Only in pulse-
echo mode
9
Sensor 7 MHz, Ø 6 mm:
ATU-US02
1
Only in pulse-
echo mode
10
Sensor 5 MHz, Ø 10 mm:
ATU-US09
1
Only in pulse-
echo mode
11
Sensor 5 MHz, Ø 10 mm:
ATU-US10, with 90° angle
1
Only in pulse-
echo mode
