Flaw Detectors

OmniScan MX ECA

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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.

Overview
Specifications
Manual
PDF brochure

OmniScan MX

English - 6.2 MB Deutsch - 5.8 MB français - 1.0 MB Español - 1.9 MB 简体中文 - 6.3 MB 日本語 - 6.1 MB русский - 5.5 MB

Lithium-Ion Batteries for the OmniScan Maintenance Guide

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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.)
Weight	1.2 kg (2.6 lb)
Connectors	1 OmniScan® connector for eddy current array probes 1 19-pin Fischer® eddy current probe connector 1 BNC connector
Number of channels	32 channels with internal multiplexer 64 channels with external multiplexer
Probe recognition	Automatic probe recognition and setup

Generator
Number of generators	1 (with internal electronic reference)
Maximum voltage	12 Vp-p into 10 Ω
Operating frequency	20 Hz to 6 MHz
Bandwidth	8 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 receivers	1 to 4
Maximum input signal	1 Vp-p
Gain	28 dB to 68 dB

Internal multiplexer
Number of generators	32 (4 simultaneously on 8 time slots; up to 64 with external multiplexer)
Maximum voltage	12 Vp-p into 50 Ω
Number of receivers	4 differential receivers (8 time slots each)
Maximum input signal	1 Vp-p

Data acquisition
Digitizing frequency	40 MHz
Acquisition rate	1 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 resolution	16 bits

Data processing
Phase rotation	0° to 360° with increments of 0.1°
Filtering	FIR 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 processing	Mixing

Data storage
Maximum file size	Limited to available internal flash memory: 180 MB (or 300 MB optional)

Data synchronization
On internal clock	1 Hz to 15 kHz (single coil)
External pace	Yes
On encoder	On 1 or 2 axes

Alarms
Number of alarms	3
Alarm zone shape	Pie, inverted pie, box, inverted box, and ring
Output type	Visual, audio, and TTL signals
Analog outputs	1 (X or Y)

Eddy Current Array Inspection

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

Learn more about our eddy current array probes

Eddy Current Array Software

Simple Acquisition and Analysis Displays

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

Step-by-step process
All the channels of a group are calibrated simultaneously, each channel having its own gain and rotation.
Amplitude and phase can be set on different reference flaws.

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

Real-time data interpolation to improve the spatial representation of defects
When working with two frequencies, a MIX signal can be generated to remove unwanted signals (for example, lift-off, fastener signals, etc.).
Several filters can be applied to the data such as high-pass, low-pass, median, and averaging filters. The illustrations below represent an application where cracks are located at the edge of a lap-joint which has a sharp thickness variation. The filtered data may improve detection, especially for small cracks.