RF energy application based on absorption peaks
Methods and apparatuses for processing objects by RF energy are disclosed. In some embodiments the method may include grouping excitation setups into at least a first group corresponding to a first peak and a second group corresponding to a second peak. The method may further include applying RF energy such that an amount of RF energy absorbed at excitation setups of the first group is equal to an amount of RF energy absorbed at excitation setups of the second group. Apparatuses according to some embodiments may include a processor configured to carry out aspects of the method.
1. A method of applying RF energy to a cavity for heating an object in the cavity, the method comprising:
obtaining a value of an absorbability indicator (AI) at each of a plurality of excitation setups;
identifying peaks, each being a group of excitation setups from among the plurality of excitation setups that together exhibit a maximum in an AI vs. excitation setup curve, and each having a maximum and a local minimum; and
applying RF energy at excitation setups belonging to the peaks based on notability values of the corresponding peaks,
wherein the notability value that corresponds to a peak is a ratio between a value of the absorbability indicator at the maximum of the peak and a value of the absorbability indicator at the local minimum of the peak.
2. The method of claim 1 , wherein applying RF energy based on notability values comprises:
causing RF energy application only at excitation setups belonging to peaks having a notability value above a threshold.
3. The method of claim 1 , further comprising:
ranking each identified peak according to at least one property thereof; and
causing RF energy application to the cavity according to the rankings.
4. The method of claim 1 , further comprising:
ranking each identified peak according to at least one property thereof; and
causing RF energy application to the cavity according to the rankings, wherein the one or more properties include one or more of:
absorbability indicator at peak maximum;
peak notability value;
peak width; and
separation between the peak and its nearest neighbor peak.
5. The method of claim 4 , wherein the rankings include at least three different rankings.
6. The method of claim 1 , wherein causing RF energy application comprises causing RF energy application only at
(i) a predetermined portion of the identified peaks;
(ii) a predetermined number of peaks,
(iii) the smaller of (i) and (ii), or
(iv) the larger of (i) and (ii).
7. The method of claim 1 , comprising:
grouping peaks into at least two groups;
ranking the peaks within each group independently of peak rankings within other at least one group; and
causing application of RF energy at peaks of each group according to peak ranks within said each groups.
8. The method of claim 7 , wherein grouping peaks comprises grouping together peaks including excitation setups having a common value of at least one c-FAP.
9. The method of claim 1 , wherein applying RF energy comprises applying in such amounts, that the amount of RF energy absorbed at excitation setups belonging to a first peak is substantially the same as the amount of RF energy absorbed at excitation setups belonging to a second peak.