Definitions for "NEAR FIELD"
Antenna patterns measured with too short a transmission length contain errors, because the fields in "near field" are curved rather than planar.
Pertains to that range of listening distances in which the sounds reaching the ears are predominantly direct. See "far field," "critical distance."
The near field is the region within one wavelength of an antenna, where the electric and magnetic fields are not related to each other solely by the characteristic impedance of free space. Non-ionising radiation Radiation that does not break chemical bonds in matter. When non-ionising radiation passes through body tissues, it does not have sufficient energy to damage DNA directly.
Within a certain distance (approximately one-sixth of a wavelength) from an emitting source.
The zone where the beam width is approximately the same as the transducer diameter, resulting in optimal resolution.
Refers to parts having and interface less then a 1/4" from the contact surface of the ultrasonic horn.