When phased array waves subtract in a manner such that the amplitude decreases, it is known as?

The phenomenon where phased array waves combine in such a way that the amplitude decreases is referred to as destructive interference. This occurs when two or more waves overlap in a manner that causes their peaks to align with the troughs of others, leading to a reduction in the overall amplitude of the resulting wave. In practical terms, this means that certain frequencies or signals can be effectively canceled out, which is particularly useful in various applications, including non-destructive testing.

Understanding destructive interference is crucial in phased array systems, as it allows for control over how signals are manipulated and perceived. This knowledge aids operators in optimizing their inspection techniques or ensuring clearer signals by minimizing noise or unwanted reflections. Recognizing the conditions under which destructive interference occurs can help technicians to refine their methods when analyzing the test results.

Other options mention constructive interference, where waves add together to increase amplitude, or phase reversal, which involves changes in the wave's phase. While formation of wave fronts describes the arrangement of waves, it does not specifically correlate to the decrease in amplitude that characterizes destructive interference. Hence, the focus on destructive interference is crucial to grasping how waves behave in phased array systems.