TOFD is a technique that uses two probes in pitch-and-catch mode. TOFD detects and records signals diffracted from defect tips for both detection and sizing. The TOFD data is displayed in a grayscale B-scan view. TOFD offers wide coverage and amplitude-independent sizing compliant with the ASME‑2235 code.

One-line scan for full-volume inspection
Setup independent of weld configuration
Very sensitive to all kinds of defects and unaffected by defect orientation

Time-of-Flight Diffraction (TOFD) and Pulse-Echo Testing

While TOFD is a very powerful and efficient technique, it suffers from limited coverage resulting from two dead inspection zones: one dead zone is near the surface, the other is at the backwall.
OmniScan UT allows inspections simultaneously combining TOFD with conventional pulse echo. Pulse echo complements TOFD and covers the dead zones.

TOFD inspection
45º pulse-echo for weld cap inspection on either sides of the weld
60º pulse-echo for weld root inspection on either sides of the weld

0‑Degree Testing (Corrosion and Composite)

The 0-degree testing measures time-of-flight and amplitude of ultrasonic echoes reflecting from the part into gates in order to detect and measure defects.

C‑scan imaging
Full A‑scan recording with C‑scan postprocessing

Ultrasound Software

Full-Featured C‑Scan

Monitors amplitude, peak position, crossing level position, and thickness on each gate
Automatic gate synchronizes from previous gate for higher dynamic range of thickness.
A‑scan data storage and C‑scan postprocessing capabilities
Optional IF gate for surface following synchronization or measurement gate or TCG/DAC curves
Either positive or negative gate on RF signal (independent for each gate)
Eight alarms completely configurable on single gate events or multiple gate events, filter for n occurrences from one or multiple channels
Customizable color palette for amplitude and thickness C‑scan
Adjustable 256-level color palette
2‑axis mechanical encoder with data acquisition synchronization on mechanical movement
Optional data library to access A‑scan and/or C‑scan on PC for custom processing

Full-Featured B‑Scan

Easy-to-interpret cross-sectional view of inspected part
Excellent display of corrosion mapping of boilers, pipes, and storage tanks
Visual identification of the thickness values acquired
Encoded TOFD capability for amplitude-independant defect sizing

Full-Featured A‑Scan

Color‑selectable A‑scan display
Reject mode
Hollow mode
Peak-hold mode (always keeps the signal that shows the maximum amplitude in gate A)
Gate threshold level crossing (changes the color of the curve that is over the gate level)
60 Hz A‑scan refresh rate with overlays of envelope and peak inside the gate

Step-by-Step calibration Wizards

All calibration procedures are guided using step-by-step wizards.

Sound velocity calibration
Wedge delay calibration
TOFD calibration
TCG calibration
Encoder calibration

TOFD Option

B-scan encoded data imaging and storage
Adjustable for brightness and contrast grayscale color palette
100 MHz A‑scan digitizing
TOFD calibration wizard online and offline
Hyperbolic cursor and reading for TOFD sizing
Lateral wave resynchronization

Ultrasound Module Specifications*

Overall dimensions	244 mm x 182 mm x 57 mm (9.6 in. x 7.1 in. x 2.1 in.)
Weight	1 kg (2.2 lb)
Connectors	LEMO® 00 (2, 4 or 8)
Pulser/Receiver
Number of pulsers/receivers	2, 4 or 8
Pulser
Pulse output	50 V, 100 V, 200 V, 300 V ±10% (variable pulse width)
Pulse width	Adjustable from 30 ns to 500 ns ±10%, resolution of 2.5 ns
Fall time	Less than 7 ns
Pulse shape	Negative square wave
Output impedance	Less than 7 Ω
Receiver
Receiver gain range	0-100 dB, by steps of 0.1 dB
Maximum input signal	20 V p-p (screen at 128%)
Minimum sensibility	200 µV p-p (screen at 128%)
Noise referred to input	160 µV p-p (26 µV RMS) (128%)
Input impedance	50 Ω
Input filter (100% bandwidth)	Centered at 1 MHz (1.5 MHz), centered at 2 MHz (2.25 MHz), centered at 5 MHz (4 MHz), centered at 10 MHz (12 MHz), centered at 15 MHz, centered at 20 MHz, 0.25-2.5 MHz, 2-25 MHz BB
Bandwidth of the system	0.25-35 MHz (-3 dB)
Rectifier	Both, positive, negative
Mode	PE (pulse-echo), PC (pitch-and-catch), TT (through-transmission). In P-C mode the maximum of number of pulsers equals the number of channels/2
Smoothing	Digital
DAC
Number of points	16
DAC range	Up to 40 dB
Maximum gain slope	20 dB/µs
Data acquisition
A-scan acquisition rate	6000 A-scans/s (512-point A-scan)
Maximum pulsing rate	1 channel at 10 kHz (C-scan)
Data processing
Real-time averaging	2, 4, 8, 16
Gates
Quantity	3: I (synchro), A and B (measure)
Synchronization	I, A, B referenced on main bang, A and B referenced on gate I (post-synchronization)
Data storage
A-scan recording (TOFD)	6000 A-scans/s (512-point A-scan) (3 MB/s transfer rate)
C-scan type data recording	10,000 (A1, A2, A3, T1, T2, T3) (3 gates) 10 kHz (lower frequency for corrosion mapping)
Data visualization
Refresh rate	60 Hz
Data synchronization
On time	1 HZ-10 kHz
On encoder	On 1 or 2 axes divided into 1 to 65,536 steps
Alarms
Number	3
Conditions	Any logical combination of gates
Signal	Amplitude or time of flight of gate A or B

Single-Axis Encoded B-Scan Inspection

Introducing the OmniScan 2-channel UT B-Scan Corrosion Mapping Kit.

This kit includes the OmniScan MX UT, the manual Remote Scan B-scan position encoder, TomoView Lite software, and a dual-UT probe. This kit addresses your B-scan inspection needs-for spot checks and one-line scans on ferrous steel structures, plates, pipes, and more.

Remote Scan, B-scan position encoder

OmniScan MX UT (2 channels)

TomoView Lite for postprocessing

Supporting Data

Questions?

Contact an Olympus NDT Specialist