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Ultrasound Inspection |
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 |
| 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 WizardsAll 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 |
Overall dimensions
(W x H x D) | 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 | | Number of pulsers | 2, 4, or 8 | | Pulse output | 50 V, 100 V, 200 V, 300 V ±10 %
(variable pulse width) | | Pulse width | Adjustable from 30 ns to 1000 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 | | Number of receivers | 2, 4, or 8 | | Receiver gain range | 0 dB to 100 dB, by steps of 0.1 dB | | Maximum input signal | 20 Vp-p (screen at 128 %) | | Minimum sensitivity | 200 µVp-p (screen at 128 %) | | Noise referred to input | 160 µVp-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 MHz to 2.5 MHz, 2 MHz to 25 MHz BB | | System bandwidth | 0.25 MHz to 32 MHz (-3 dB) | | Rectifier | Both, positive, negative | | Mode | 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. | | 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 12 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 | 12 000 (A1, A2, A3, T1, T2, T3) (3 gates)
12 kHz
(lower frequency for corrosion mapping) | | Data visualization | | Refresh rate | 60 Hz | | Data synchronization | | On time | 1 Hz to 12 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 TOF of gate A or B |
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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 |
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