OmniScan MX ECA


OmniScan MX ECA

Performs eddy current array testing inspections. The test configuration supports 32 sensor coils (up to 64 with an external multiplexer) working in bridge or transmit-receive mode. The operating frequency ranges from 20 Hz to 6 MHz with the option of using multiple frequencies in the same acquisition.

Eddy Current Array Technology
Eddy current array (ECA) technology provides the ability to electronically drive and read several eddy current sensors positioned side by side in the same probe assembly. Data acquisition is made possible through the use of multiplexing, which avoids mutual inductance between individual coils.

The OmniScan® ECA test configuration supports 32 sensor coils (up to 64 with an external multiplexer) working in bridge or transmit-receive mode. The operating frequency ranges from 20 Hz to 6 MHz with the option of using multiple frequencies in the same acquisition.

Benefits of Eddy Current Arrays
Compared to single-channel eddy current technology, eddy current array technology provides the following benefits:

  • Dramatically reduces inspection time.
  • Covers a large area in a single pass.
  • Reduces the complexity of mechanical and robotic scanning systems.
  • Provides real-time cartography of the inspected region, facilitating data interpretation.
  • Is well suited to complex part geometry.
  • Improves reliability and probability of detection (POD).

Eddy Current Array Probes
Olympus manufactures ECA probes for a wide range of applications. Probes can be designed to detect a specific type of flaw or to follow the shape of the part being inspected. Standard designs are available to detect defects such as cracks and pitting, and subsurface defects such as cracks in multilayer structures, as well as corrosion.


Multiplexing principle between elements. Coils are shown for illustration purposes only.


Eddy current array probes can replace one axis of a two-axis scan and offer greater flexibility in the eddy current setup.

Probes can be made in different shapes and sizes to follow, with ease, the contour of the part under inspection.


Transmit-receive probe for corrosion detection down to 6 mm (0.25 in.) in aluminum


Transmit-receive probe for surface-crack detection shown with optional encoder

Absolute probe for surface crack detection

Eddy Current Array Software

Simple Acquisition and Analysis Displays

Acquisition DisplayAnalysis Display
  • Data acquisition in a C-scan view for quick and efficient defect detection
  • Data selection in Analysis mode to review the signal in the impedance plane and strip charts
  • Amplitude, phase, and position measurement
  • Adjustable color palette
  • Large impedance plane and strip chart views to accommodate conventional single-channel ECT probe inspection

Calibration Wizard

Alarms

  • Three alarm outputs can combine LED, buzzer, and TTL output.
  • Various alarm zone shapes can be defined in the impedance plane (sectorial, rectangular, ring, etc.).

Automatic Probe Detection and Configuration

  • C-scan parameters and multiplexing sequence are automatically set when the probe is connected.
  • Frequency range protection to avoid probe damage

Subtraction Tools in Analysis Mode

This function can be used to remove the lift-off variation that is shown between adjacent channels.

Advanced Real-Time Data Processing

Acquisition DisplayAnalysis Display
Acquisition DisplayAnalysis Display

Eddy Current Modules Specifications

General
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.)
Weight1.2 kg (2.6 lb)
Connectors1 OmniScan® connector for eddy current array probes
1 19-pin Fischer® eddy current probe connector
1 BNC connector
Number of channels32 channels with internal multiplexer
64 channels with external multiplexer
Probe recognitionAutomatic probe recognition and setup
Generator
Number of generators1 (with internal electronic reference)
Maximum voltage12 Vp-p into 10 Ω
Operating frequency20 Hz to 6 MHz
Bandwidth8 Hz to 5 kHz (in single coil). Inversely proportional to the time-slot duration and set by the instrument in multiplexed mode.
Receiver
Number of receivers1 to 4
Maximum input signal1 Vp-p
Gain28 dB to 68 dB
Internal multiplexer
Number of generators32 (4 simultaneously on 8 time slots; up to 64 with external multiplexer)
Maximum voltage12 Vp-p into 50 Ω
Number of receivers4 differential receivers (8 time slots each)
Maximum input signal1 Vp-p
Data acquisition
Digitizing frequency40 MHz
Acquisition rate1 Hz to 15 kHz (in single coil). The rate can be limited by the instrument’s processing capabilities or by delays set by the multiplexed excitation mode.
A/D resolution16 bits
Data processing
Phase rotation0° to 360° with increments of 0.1°
FilteringFIR low-pass, FIR high-pass, FIR band-pass, FIR band-stop (adjustable cutoff frequency), median filter (variable from 2 points to 200 points), mean filter (variable from 2 points to 200 points)
Channel processingMixing
Data storage
Maximum file sizeLimited to available internal flash memory: 180 MB (or 300 MB optional)
Data synchronization
On internal clock1 Hz to 15 kHz (single coil)
External paceYes
On encoderOn 1 or 2 axes
Alarms
Number of alarms3
Alarm zone shapePie, inverted pie, box, inverted box, and ring
Output typeVisual, audio, and TTL signals
Analog outputs1 (X or Y)
Lithium-Ion Batteries for the OmniScan Maintenance Guide
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