Computed Radiography with Ir-192, Co-60, Se-75, X-rays (CR can also be performed with SCAR/CPR system)
PHASED ARRAY TESTING
The PA probe consists of many small ultrasonic transducers, each of which can be pulsed independently. By varying the timing, for instance by pulsing the elements one by one in sequence along a row, a pattern of constructive interference is set up that results in a beam at a set angle. In other words, the beam can be focused and steered electronically. The beam is swept like a search-light through the tissue or object being examined, and the data from multiple beams are put together to make a visual image showing a slice through the object.
This course follows the ASNT – Level II Phased Array syllabus and is designed to take the experienced NDT technician though the fundamentals of Phased Arrays, including Principles, Digitization and History of Phases Arrays, supported by a series of lab applications that will have the end user proficient with the Phased Array process, encoding scans, compiling groups and basic interpretation.
We can provide Phased Array Training courses and examinations suitable for the following certification scheme.
TIME OF FLIGHT DIFFRACTION
Measuring the amplitude of reflected signal is a relatively unreliable method of sizing defects because the amplitude strongly depends on the orientation of the crack. Instead of amplitude, TOFD uses the time of flight of an ultrasonic pulse to determine the position and size of a reflector.
In a TOFD system, a pair of ultrasonic probes sits on opposite sides of a weld. One of the probes, the transmitter, emits an ultrasonic pulse that is picked up by the probe on the other side, the receiver. In undamaged pipes, the signals picked up by the receiver probe are from two waves: one that travels along the surface and one that reflects off the far wall. When a crack is present, there is a diffraction of the ultrasonic wave from the tip(s) of the crack. Using the measured time of flight of the pulse, the depth of a crack tips can be calculated automatically by simple trigonometry.
This course is designed to take the advanced NDT technician through the Time of Flight Diffraction Technique and its ability to perform flaw detection, location and sizing. Considerable time is spent in the collection and analysis of Time of Flight Diffraction data and the comparison to traditional Pulse -Echo technique.
We can provide TOFD Training courses and examinations.