Heating apparatus with piezoelectric device sensor

Details Heating apparatus with piezoelectric device sensor Heating apparatus with piezoelectric device sensor

1986-04-11

1987-06-09

Leung, Philip H.

Electric heating

Heating devices

With power supply and voltage or current regulation or...

219 1055B, 219 1055R, 733365, 324 61QL, H05B 668, G01R 2726

Patent

active

046721800

ABSTRACT:
In an exhaust passage (37) of a heating apparatus, a piezoelectric device sensor (26) is provided for detecting the heating condition of a heated object (32), such as food in a microwave open heating chamber (31). A piezoelectric device of the sensor may be contained within a metal casing (53) and be hermetically sealed. An output signal from the piezoelectric device sensor is processed by circuitry including an amplifier (27) having a predetermined frequency response so that only particular frequency components lower than that of a conventional a.c. supply are amplified and then compared with a threshold to detect whether a sufficient amount of moisture of hot steam is emitted from the object in the heating chamber of the heating apparatus. The invention may be applied to prevent overheating of food in a microwave oven, temperature control of chemical processes, or the like, to control heating time.

REFERENCES:
patent: 3102183 (1963-08-01), Harrison
patent: 3467804 (1969-09-01), Smith
patent: 3838248 (1974-09-01), Uchida et al.
patent: 3839616 (1974-10-01), Risman
patent: 4210795 (1980-07-01), Lentz
patent: 4221129 (1980-09-01), Sidebottom et al.

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