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far field

[yuǎn chǎng]
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yuǎn chǎng
farfield；distantfield
1. On Pulsar Of Radius of light speed Outside the field (such as magnetic field ， field of gravity ) 。
2. Distance transmitter 5 wavelength Or farther away electromagnetic field , here Radial electric field Negligible. Occurred by antenna Power flux density An approximate field that is inversely proportional to the square of the distance.
3. On Diffractive optics The far field can be defined as: Incident light wave Is a plane wave , via lens After meeting Focal spot Within the front and back half Rayleigh length light field It is called far field. In general, Fraunhofer diffraction Can be regarded as a Far-field diffraction 。
4. Refers to Radioactive waste repository Surroundings are not affected by this Repository Natural influence Geological system , it is blocking Radionuclide migration The most important barrier. Far-field temperature 、 Chemistry Features and Hydrogeology Features are in a relatively stable state, and their changes follow geology The normal rate of evolution. Far-field control groundwater get into near field At the same time, block the Radionuclide And dilute its concentration. stay performance evaluation Medium, far field biosphere The release amount of radiation dosage Source item for.
Chinese name
far field
Foreign name
farfield；distantfield
Pinyin
yuǎn chǎng
Definition
stay Pulsar Of Radius of light speed Field outside
far field
explicate
1. On Pulsar Of Radius of light speed Outside the field (such as magnetic field ， field of gravity ) 。
2. Distance transmitter 5 wavelength Or farther away electromagnetic field , here Radial electric field Negligible. Power flux generated by antenna density An approximate field that is inversely proportional to the square of the distance.
3. On Diffractive optics The far field can be defined as: Incident light wave Is a plane wave , via lens After meeting Focal spot Within the front and back half Rayleigh length light field It is called far field. In general, Fraunhofer diffraction Can be regarded as a Far-field diffraction 。
4. Refers to Radioactive waste repository Surroundings are not affected by this Repository Natural influence Geological system , it is blocking Radionuclide The most important barrier for migration. Far-field temperature 、 Chemistry Features and Hydrogeology Features are in a relatively stable state, and their changes follow geology The normal rate of evolution. Far-field control groundwater get into near field At the same time, block the Radionuclide And dilute its concentration. stay performance evaluation Medium, far field biosphere The release amount of radiation dosage Source item for.
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