ACS A1212 MASTER, Operation Manual

Page: 15 / 64

Ultrasonic flaw detector А1212 MASTER
Operation Manual
15
ACOUSTIC
CONTROL
SYSTEMS
2
echo, echo-mirror, mirror-through-transmission (echo-shadow) and through-transmission. Different transducers are used in
the instrument to realize these inspection methods: straight beam, angle beam, single crystal and double-crystal PTs with
operating frequencies from 0.5 to 15.0 MHz.used;
Straight beam single crystal
PTs are used for non-destructive inspection and thickness
measurement of the objects of big thickness.
The maximum testing depth depends on the operational frequency of the transducer, diameter of
its working surface and attenuation of ultrasonic waves in the material of the tested object. The dead
area at that is defined by damping the quality of the ultrasonic transducer.
Straight beam single crystal
PTs provide high wear resistance due to ceramic protector.
These transducers are well suited for thickness measurement of the objects made of polymer mate-
rials due to their electroacoustic properties.
Straight beam double-crystal PTs are used for inspection of objects of moderate thickness with
greatest possible sensitivity. Typically, these transducers are used to inspect thicknesses from 0.8
to 50.0 mm.
Angle beam
PTs are used for non-destructive testing of the objects and their segments at the
spots with no access to the surface above the inspection area.
Angle beam transducers with an angle of incident from 400 to 900 and operational frequency
from 1 to 5 MHz can be as well used depending on the geometrical dimensions of the object, the most
probable position and direction of the flaw, acoustic properties of the material and testing procedure.
Table 3 contains general recommendations for choosing values of frequency, angle of incident
and other parameters of the angle beam transducers used for testing of the carbon steel welding
seams of various thicknesses.