Design Of The Flaw Detector - NOVOTEST UD3701 Operation Manual

Operation manual
Ultrasonic Flaw Detector NOVOTEST UD3701
Flaw detector implements shadow, echo and mirror-shadow methods of UT testing.
As for structure, flaw detector consists of functional finished blocks (electronic plates). Electronic
blocks are connected via detachable sockets (ports) (Figure 1.7).
Battery
Piezoelectric converter
Structurally flaw detector consists of display panel, central processing unit (CPU), DA converter,
AC converter, analog board, memory and recharging battery.
Display panel is a 7-inch touch screen display with resolution of 800х480 pixels and dimensions
of 155х85 mm.
Central processing unit (CPU) is made on the base of high-performance digital signal processor
(DSP), which supports all control function of the flaw detector and signal processing.
Also, central panel contains elements of the device electro-acoustic tract: digital-analog converter
(DA converter) and analog-digital converter (AD converter).
Analog board includes generator of probing impulse and amplifier.
Under DSP command, generator sends electric probing impulse to piezoelectric converter (UT
probe) through transmitter port on the device. UT probe signal (UT wave) is sending inside the tested
object. Reflected UT wave is converted in UT probe into electric impulse and through receiver port on
the device comes to in-port of amplifier. Amplifier coefficient is set by DSP through DA converter of
time varied gain. Multiplied electric impulse comes to in-port of AD converter. From out-port of AD
converter digital signal comes to DSP for further processing and displaying.

1.6.1 Design of the flaw detector

The flaw detector consists of:
а) housing with keyboard, USB port (for PC connection and battery charging), ports for connector
cables UT probe/electronic block;
b) touch screen display;
c) electronic board.
All the control keys for operating are placed on the front device panel. Side panel has USB port
for PC connection and battery charging. Upper panel contains port for connector cables UT
probe/electronic block.
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Keyboard
Central
processing unit
(CPU)
Generator
Figure 1.7 – Structural scheme of the flaw detector
Display panel
DA
conv.
AD
conv.
Amplifier