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4.5.5
TOFD (BW) – Time Of Flight Diffraction
4.5.5.1 Initializing TOFD Mode
The instrument shall be set to the TR MODE
DUAL
–
see
4.1.4.
TR
MODE
–
Transmitter/Receiver Mode.
A-scan display shall be switched to
RF
mode – see 4.1. Basic Menu.
In order to switch ON the TOFD (Time Of
Flight Diffraction mode, switch the BSCAN
MODE to TOFD (BW) in the
SETTING
>
DISPLAY
menu – see 4.5.2. BSCAN Modes.
After depressing the
TOFD
execution key,
measured signal amplitudes will be shown
as a grey scale palette B-scan, with A-scan
presentation in the bottom part of the
screen.
4.5.5.2 Basic Settings For TOFD Technique
1) Set the TOFD (BW) – go to SETTING >
DISPLAY > BSCAN MODE.
2) For use with encoder (IRC), depress the
key and set MULTI MODE = IRC A,B & C,
then go to SETTING > DISPLAY > IRC ON.
Set the IRC RES according to the encoder.
3) Switch the A-scan display to the RF signal,
ten switch on TOFD (internally i tis a B-scan
with BW palette, where Gate1 position has
no effect on the grey scale mapping).
4) Set the actual distance between indexes of
both probes TOFD DIST 2S=xxx mm.
5) Set the materiál thickness and probe angle for the bottom reflection at chosen
probe distance
?
probe
movement
initial
pulse
