Microwave heating method and apparatus

Abstract

It is intended to suppress local heating peculiar to microwave heating to ensure uniform heating of a heating subject so as to provide improved results of heating. A microwave heating method for heating a heating subject by supplying microwaves to a heating chamber (11) having the heating subject carried therein, the method comprising the steps of supplying microwaves into the heating chamber (11) to heat the heating subject, measuring the temperature of the heating subject to detect whether or not a predetermined temperature difference is produced in the temperature distribution of the heating subject, and supplying fine particles of water into the heating chamber (11) when a predetermined temperature difference is produced so as to change the dielectric constant distribution state in the heating chamber (11), thereby changing the electric field distribution produced by the microwaves supplied into the heating chamber (11).

Description

technical field

[0001] The invention relates to a microwave heating method and device for high-frequency heating (dielectrically heating) objects to be heated. Background technique

[0002] In a microwave oven as a representative microwave heating device, microwaves radiated from a magnetron are transmitted into a heating chamber via a waveguide to form a standing wave in the heating chamber. According to the electric field component of the standing wave and the dielectric loss of the object to be heated, Items to be heated generate heat. Energy P[W / m] absorbed by the item to be heated per unit volume 3 ] can be expressed by the following equation:

[0003] That is, P=(5 / 9)εr·tanδ·f·E 2 ×10 -10 [W / m 3 ], where E[V / m] represents the applied electric field strength, f[Hz] represents the frequency, εr represents the relative permittivity of the object to be heated (the real part of the dielectric constant), and tanδ represents the dielectric constant of the object to be he...

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