Which type of scanning uses the same focal law that is multiplexed across a group of active elements?

The concept of multiplexing focal laws across a group of active elements is a key feature of electronic scanning. This method allows for the simultaneous activation of multiple elements while maintaining the same focal law, which enhances the flexibility and efficiency of the scanning process. By using electronic scanning, an array can rapidly change the direction of the ultrasound beam without the need for mechanical movement, resulting in improved speed and accuracy in inspections.

In electronic scanning, the software manipulates the timing and intensity of the signals emitted from the array, enabling the beam to focus at different depths and angles. This capability is particularly advantageous in phased array ultrasonic testing as it allows for quick adjustments to accommodate various inspection scenarios while maintaining the integrity and quality of the data gathered.

Other scanning methods, such as sectorial scanning, azimuthal scanning, and raster scanning, do not utilize the multiplexing of the same focal law across multiple elements in the same way. Sectorial scanning typically focuses on a pie-shaped sector and might require different focal laws as the angle changes. Azimuthal and raster scanning approaches tend to involve different patterns of scanning or movement that do not inherently include the multiplexing feature that characterizes electronic scanning.