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Ultrasound Inspection
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Time-of-Flight Diffraction Testing 
Time-of-flight diffraction (TOFD) is a technique that uses two probes in pitch-catch mode. TOFD detects and records signals diffracted from defect tips allowing both detection and sizing. The TOFD data is displayed in a grayscale B-scan view. TOFD offers wide coverage and amplitude-independent sizing complying 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
TOFD and Pulse-Echo Testing
While TOFD is a very powerful and efficient technique, its coverage is limited as a result of two inspection dead zones: one dead zone is near the surface, the other is at the backwall.
The OmniScan® UT allows inspections that simultaneously combine TOFD with conventional pulse echo. Pulse echo complements TOFD, covering the dead zones.
- TOFD inspection
- 45º pulse echo for weld cap inspection on either side of the weld
- 60º pulse echo for weld root inspection on either side of the weld
0‑Degree Testing (Corrosion and Composite)
0-degree testing measures the 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
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Ultrasound Software
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| 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
- Positive or negative gate on RF signal (independent for each gate)
- Eight completely configurable alarms 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‑scans
- Adjustable 256-level color palette
- 2‑axis mechanical encoding with data-acquisition synchronization on mechanical movement
- Optional data library to access A‑scans and/or C‑scans on PCs for custom processing
Full-Featured B‑Scan- Easy-to-interpret cross-sectional view of inspected part
- Excellent display of corrosion mapping for boilers, pipes, and storage tanks
- Visual identification of acquired thickness values
- 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
- Grayscale color palette, adjustable for brightness and contrast
- 100-MHz A‑scan digitizing
- TOFD calibration wizard, online and offline
- Hyperbolic cursor and reading for TOFD sizing
- Lateral wave resynchronization
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Ultrasound Module Specifications
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Overall dimensions
(W x H x D)
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244 mm x 182 mm x 57 mm
(9.6 in. x 7.1 in. x 2.1 in.)
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Weight
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1 kg (2.2 lb)
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Connectors
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LEMO® 00 (2, 4, or 8)
| | Pulser | |
Number of pulsers
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2, 4, or 8
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Pulse output
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50 V, 100 V, 200 V, 300 V ±10 %
(variable pulse width)
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Pulse width
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Adjustable from 30 ns to 1000 ns ±10 %, resolution of 2.5 ns
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Fall time
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Less than 7 ns
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Pulse shape
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Negative square wave
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Output impedance
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Less than 7 Ω
| | Receiver | |
Number of receivers
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2, 4, or 8
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Receiver gain range
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0 dB to 100 dB, by steps of 0.1 dB
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Maximum input signal
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20 Vp-p (screen at 128 %)
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Minimum sensitivity
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200 µVp-p (screen at 128 %)
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Noise referred to input
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160 µVp-p (26 µV RMS) (128 %)
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Input impedance
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50 Ω
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Input filter
(100 % bandwidth)
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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 MHz to 2.5 MHz, 2 MHz to 25 MHz BB
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System bandwidth
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0.25 MHz to 32 MHz (-3 dB)
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Rectifier
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Both, positive, negative
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Mode
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PE (pulse-echo), PC (pitch-catch), TT (through-transmission). In PC mode the maximum number of pulsers equals the number of channels divided by 2.
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Smoothing
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Digital
| | DAC | |
Number of points
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16
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DAC range
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Up to 40 dB
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Maximum gain slope
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20 dB/µs
| | Data acquisition | |
A-scan acquisition rate
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6000 A-scans/s (512-point A-scan)
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Maximum pulsing rate
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1 channel at 12 kHz (C-scan)
| | Data processing | |
Real-time averaging
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2, 4, 8, 16
| | Gates | |
Quantity
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3: I (synchro), A and B (measure)
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Synchronization
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I, A, B referenced on main bang; A and B referenced on gate I (post-synchronization)
| | Data storage | |
A-scan recording (TOFD)
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6000 A-scans/s (512-point A-scan)
(3 MB/s transfer rate)
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C-scan type data recording
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12 000 (A1, A2, A3, T1, T2, T3) (3 gates)
12 kHz
(lower frequency for corrosion mapping)
| | Data visualization | |
Refresh rate
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60 Hz
| | Data synchronization | |
On time
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1 Hz to 12 kHz
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On encoder
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On 1 or 2 axes divided into 1 to 65 536 steps
| | Alarms | |
Number
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3
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Conditions
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Any logical combination of gates
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Signal
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Amplitude or TOF of gate A or B
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Single-Axis Encoded B-Scan Inspection
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 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.
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Remote Scan, B-scan position encoder
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OmniScan MX UT (2 channels)
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TomoView Lite for postprocessing
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