Thanks to the fully parallel architecture the FMC/TFM protocols of data acquisition, processing and imaging are implementable in all ISONIC series portable PA ultrasonic flaw detectors (ISONIC 3510, ISONIC 2010, ISONIC 2009) and in the platform for the high speed automatic inspection ISONIC PA AUT from Sonotron NDT. Starting from the next software release scheduled to July, 2017 and all next releases the FMC/TFM protocol becomes available as the standard feature for all suitable modes of operation.
It is important that the ISONIC series PA instruments are featured with 100% raw data storage for all inspections performed: for every focal law implemented with the use of some coverage strategy, such as S-Scan, Linear Scan, 3D-Scan, etc or a combination of them the resulting A-Scan is formed as the outcome of superimposing with the corresponding phase shifts of several of primary A-Scans produced by each element of the receiving aperture. As the primary A-Scans are stored as raw data the TFM image may be reconstructed even for the files created using the S-, Linear-, or 3D-Scan, etc in past.
The exemplary videos below illustrate the reconstruction of TFM image from the pure S-Scan files, which were obtained with no angle gain compensation and DAC normalization (or TCG), and comparison of TFM images with the EquPAS S-Scan coverage results: the EquPAS (Equalized Phased Array Inspection Sensitivity) approach is based on the simultaneous use of two independent mechanisms equalizing the inspection sensitivity over entire insonified part of the material, namely Angle Gain Compensation and DAC (TCG) normalization. All compared results were obtained with the same probe situated at the same position on the material:
As it is clear from the videos the TFM protocol and EquPAS S-Scan improve the coverage and sharpness of ultrasonic imaging significantly comparing to the pure S-Scan. The detectability and imaging of the planar reflectors, which’s echo amplitudes strongly depend on the insonification direction have been improved very significantly as well.
On the other hand comparing to FMC/TFM the EquPAS S-Scan allows using of smaller footprint probes; moreover the significantly less number of focal laws (pulsing/receiving cycles) should be implemented in order to cover the same portion of the material so generally speaking the EquPAS S-Scan coverage allows scanning with the higher speed requiring the smaller area to be cleaned on the surface of the material prior to the probe manipulation.
The availability of both complimentary approaches, namely FMC/TFM and EquPAS in the same instrument will allow the inspection organization in finding the optimal solutions in their daily practice