Loss profile analysis
Apparatuses and methods are disclosed for applying radio frequency (RF) energy to an object in an energy application zone. At least one processor may be configured to cause RF energy to be applied at a plurality of electromagnetic field patterns to the object in the energy application zone. The processor may be further configured to determine an amount of power dissipated in the energy application zone, for each of the plurality of field patterns. The processor may also be configured to determine a spatial distribution of energy absorption characteristics across at least a portion of the energy application zone based on the amounts of power dissipated when the plurality of field patterns are applied to the energy application zone.
1. A method of applying radio frequency (RF) energy to an object in a cavity, the method comprising:
discretizing the cavity into a plurality of regions, the plurality of regions overlapping with at least a portion of the object;
controlling at least one of frequency, phase, or relative amplitude of electromagnetic waves generated by a source of RF energy to apply RF energy to the cavity to excite a plurality of electromagnetic field patterns in the cavity, wherein each of the plurality of electromagnetic field patterns is spatially mapped to the plurality of regions;
for each of the plurality of electromagnetic field patterns, determining an amount of RF power dissipated in the cavity; and
determining a spatial distribution of energy absorption characteristics across at least a portion of the plurality of regions based on the amounts of RF power, each corresponding to one of the plurality of electromagnetic field patterns.
2. The method according to claim 1 , wherein the spatial distribution of energy absorption characteristics is determined based on an electromagnetic field intensity distribution associated with each of the plurality of electromagnetic field patterns, and the amount of RF power dissipated in the cavity at each of the plurality of electromagnetic field patterns.
3. The method according to claim 1 , further comprising determining a location of the object based on the spatial distribution of energy absorption characteristics.
4. The method according to claim 1 , further comprising recurringly determining the spatial distribution of energy absorption characteristics.
5. The method of claim 4 , wherein a time lapse between two determinations of the spatial distribution of energy absorption characteristics is a function of a magnitude of a difference between two determined spatial distributions of energy absorption characteristics.
6. The method of claim 4 , wherein a time lapse between two determinations of the spatial distribution of energy absorption characteristics is a function of characteristics of the object.
7. The method according to claim 1 , further comprising causing differing amounts of RF energy to be applied to differing portions of the cavity based on the spatial distribution of energy absorption characteristics.
8. The method according to claim 1 , further comprising causing controlled amounts of energy to be absorbed at differing regions in the object.
9. The method according to claim 1 , further comprising storing the spatial distribution of energy absorption characteristics as a look-up table.
10. The method according to claim 1 , further comprising displaying the spatial distribution of energy absorption characteristics in at least one portion of the cavity as an image.
11. The method according to claim 1 , wherein the method further comprises:
determining the spatial distribution of energy absorption characteristics based on the spatial mapping of the plurality of electromagnetic field patterns to the plurality of regions.