Definitions for "Far Field"
The zone beyond the near field in front of the transducer in which signal amplitude decreases monotonically in proportion to distance from the transducer. Also called the Fraunhofer zone.
Pertains to that range of listening distances in which the predominant sounds reaching the ears are reflections from room boundaries.
The region where Antenna patterns and RCS patterns need to be measured with adequate transmission distance (in terms of wavelength) or they will not be typical of the patterns expected in typical use over long distances. Measurements made over short distances (near field) contain errors because the fields are curved rather than planar.
Refers to parts having an interface more then 1/4" from the contact surface of the ultrasonic horn.
The region where the ultrasound beam diverges and resolution decreases.