ISONIC 2008 Multi Channel Ultrasonic Flaw Detectors - Technical Data

Both time-based and true-to-location strip chart creating is available. For true-to-location strip chart forming it is used built-in incremental encoder interface.

Observation of A-Scan is possible for every channel whilst scanning. Strip accompanied with A-Scan is marked with . To observe A-Scan related to another strip it is necessary just to click on the strip selected

ADVANCED NDT LIMITED,
Orchard House, Orchard Close, Severn Stoke, Worcester, UK    WR8 9JJ
Telephone: 44 (0) 1905 371460        *** Fax:   44 (0) 1905 371477
E-Mail: sales@advanced-ndt.co.uk *** Website:   www.advanced-ndt.co.uk

Multi-Channel Pulsing Receiving

ISONIC 2008 comprises 8 identical UDS 3-6 pulsing-receiving channels. Most of parameters such as gain, filter settings, pulse duration, display mode, delay, range, ultrasound velocity, etc are individually calibrated per channel. Just firing level (the amplitude of initial pulse) and PRF (pulse repletion frequency) are common for all channels. Every channel may drive either single or dual element probe or probe pair through 2 probe terminals

Every channel has its own signal digitizer (A/D Converter)

Highest scanning speed may be achieved through simultaneous (parallel) pulsing, receiving, signal digitizing, and recording by up to 8 channels. Measures avoiding cross talking to be taken while placing simultaneously fired probes on the object under test – the probes must be well separated

Most compact probes placement on the object under test with complete avoiding of cross talking is provided through pulsing, receiving, signal digitizing, and recording channels separately in time in a sequence loop (sequentially). Sequential pulsing-receiving also saves battery life
Various color combinations may be used for each channel A-Scan. This provides easy distinguishing between channels for multiple A-Scan observations
Two types of calibration files created by ISONIC 2008 may contain settings either for single channel or for all 8 channels simultaneously

Multi-channel record includes few strips of the following types:

TOFD
Map
Amplitude/TOF Pulse Echo
Coupling

Strips may appear in any combination created by an operator in accordance with implemented inspection procedure. Positioning of the probes in the scanner relatively to each other – offset – to be keyed in at pre-scanning stage to align the strips

256 gray levels TOFD strip represents sequence of RF A-Scans whereas brightness of points for each horizontal line is modulated according to corresponding signal level.

Main use TOFD strip is recording of TOFD channels data for weld inspection. TOFD strip is also useful for recording CHIME inspection and for some applications where obtaining of RF B-Scan is necessary

256 Colors Palette Map Strip represents sequence of A-Scans whereas color of points for each horizontal line is coded according to corresponding signal level.

Main use Map Strip is recording of pulse echo inspections using either longitudinal, shear, surface, or guided waves

Amplitude / TOF Pulse Echo Strip represents peak amplitude and time of flight for signals matching with Gate and exceeding it’s threshold level

Position of Amplitude Line on the strip is proportional to the signal height. Echo amplitude equal or exceeding 100% of A-Scan height brings Amplitude Line trace to full strip width level

Width of gray Time of Flight (TOF) Rectangle is proportional to the signal position in the Gate. For signals, which’s time of flight measurement point matches with the Gate end width of gray Time of Flight (TOF) Rectangle is equal to the full strip width

For defects signals followed by strong geometry echoes Amplitude Line may represent either first or maximal signal amplitude depending on operator's choice while width of gray Time of Flight (TOF) Rectangle will represent position of the first signal crossing gate level

Amplitude / TOF Pulse Echo Strip may be used for thickness/corrosion profiling and for various flaw detection tasks

Coupling Strip is formed through comparing amplitude of reference signal with the gate threshold. Green Sufficient Coupling record is provided for signals exceeding gate threshold; red Insufficient Coupling record is provided in opposite case

Position of each probe along scanning line is taken into account while forming strip chart through use of appropriate offset values keyed in at pre-scanning stage. Thanks to such feature the same defect detected by different probes will be indicated in the same longitudinal position in each corresponding strip

Complete sequences of A-Scans for each strip are recorded during scanning making ISONIC 2008 inspection fully compatible with ASME 2235-9 Code Case for radiography replacement and other national and international codes. Upon scanning is completed strip charts accompanied with the entire raw data and instrument settings may be stored into a file

Varying Region of Interest (Gate) settings for every Amplitude / TOF Pulse Echo Strip

Marking defects and generating of Strip Chart Inspection Report

Postprocessing each strip individually using applicable technology either TOFD, CB-Scan, or Thickness Profile including full scope of suitable procedures such as defects sizing, snap-shoots, off-line Gain correction, filtering, etc