What is the term for the sequence of operations that controls which phased array elements are pulsed at which time delay?

The sequence of operations that dictates which phased array elements are pulsed and the specific time delays associated with those pulses is known as the focal law. This terminology is essential in phased array systems, as the focal law directly influences how the ultrasound beams are constructed and directed. By controlling the timing of the excitation of different elements, the focal law allows the beams to be steered and focused at desired locations within the material being tested.

In a practical sense, the implementation of the focal law enables the operator to adjust the focal point of the beams, which is crucial for obtaining high-resolution images and accurate measurements of potential flaws or discontinuities within the test material. This capability to dynamically steer the beam and change its focus is one of the significant advantages of using phased array technology compared to conventional ultrasonic testing methods.

Furthermore, understanding focal laws is foundational to optimizing the performance of the phased array system and ensuring effective inspections, making this knowledge vital for technicians and engineers working within the field.