Electric heating – Microwave heating – With control system
Patent
1993-10-15
1995-06-13
Leung, Philip H.
Electric heating
Microwave heating
With control system
219704, 219709, 219736, 34260, H05B 668
Patent
active
054245150
ABSTRACT:
The present invention features a UV tube detector for sensing a resonant arcing condition in a microwave environment. Where clothing or fabric is being dried in a magnetron-powered, microwave chamber, the UV tube detector is placed in proximity to the fabric. The UV tube detector senses a possible resonant arcing condition related to small metal objects hidden in the material. Upon the sensing of arcing, the UV tube provides a signal for shutting down the magnetron power. In conjunction with UV detection, the moisture condition can be monitored during the drying cycle. At a point in the microwave heating cycle consistent with an "end of microwave heating cycle" or "near dryness", the power output of the magnetrons is reduced or terminated. The moist fabric can then be dried via reduced microwave heating and/or by normal heating methods, including, but not limited to, electrical radiant heating and convection techniques. In this manner, it is possible to bring the fabric to a state of dryness, despite the presence of resonant arc-producing objects.
REFERENCES:
patent: 3439431 (1969-04-01), Heidtmann
patent: 4351013 (1982-09-01), Matsko et al.
patent: 4523387 (1985-06-01), Mahan
patent: 4765066 (1988-08-01), Yoon
patent: 4795871 (1989-01-01), Strattan et al.
patent: 5270509 (1993-12-01), Gerling
Leung Philip H.
Micro Dry Inc.
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