High-frequency treatment device

A high-frequency treatment device comprising:

• a heating chamber configured to accommodate a heating target;
• a high-frequency power generator operable to generate high-frequency power having a frequency selected from a predetermined frequency band;
• a feeder configured to supply incident microwave power corresponding to the high- frequency power to the heating chamber;
• a detector operable to detect at least one of the incident microwave power and reflected microwave power that is included in the incident microwave power and returns from the heating chamber to the feeder;
• a controller operable to control heating of the heating target by controlling the high- frequency power generator;
• and
• a storage operable to store, together with the frequency of the high-frequency power and time elapsed from a start of heating, information detected by the detector, wherein
• the controller is operable to cause the high-frequency power generator to repeatedly generate, on a per frequency basis, the high-frequency power having a plurality of frequencies for the heating,
• the controller is operable to determine a state of the heating target on the basis of one of temporal changes in the reflected microwave power at the plurality of frequencies, a temporal changes in a reflection ratio at the plurality of frequencies, and temporal changes in a microwave power difference at the plurality of frequencies, and control the heating, the reflection ratio being a ratio of the reflected microwave power to the incident microwave power, the microwave power difference being a difference between the incident microwave power and the reflected microwave power, and
• the temporal changes in the reflected microwave power at the plurality of frequencies, the temporal changes in the reflection ratio at the plurality of frequencies, and the temporal changes in the microwave power difference at the plurality of frequencies, are obtained based on information from the detector and the storage.