Temperature responsive optical switch

Details Temperature responsive optical switch Temperature responsive optical switch

1979-06-04

1981-04-14

Yeung, James C.

Stoves and furnaces

Tool having fluid fuel burner

Soldering iron

126422, 126417, 350267, 350353, 136246, F24J 302

Patent

active

042613310

ABSTRACT:
An optical switching device for reflecting incident light at or above a predetermined temperature comprises a layer of a metal sulfate salt solution in thermal contact with a source of heat. The solution is characterized as having decreasing salt solubility with increasing temperature. When the heat source exceeds a predetermined temperature, the solution precipitates a light scattering layer, substantially reflecting incident light.
Embodied in a solar panel, the present invention provides automatic over-temperature control, reflecting light from the energy converter whenever panel temperature exceeds a predetermined limit.

REFERENCES:
patent: 2501418 (1950-03-01), Snowden, Jr.
patent: 3169163 (1965-02-01), Nassenstein
patent: 3384324 (1968-05-01), O'Sullivan, Jr.
patent: 3470049 (1969-09-01), Reusch
patent: 3580079 (1971-05-01), Crites
patent: 3723349 (1973-03-01), Heseltine et al.
patent: 3790250 (1974-02-01), Mitchell et al.
patent: 4167934 (1979-09-01), Miles
patent: 4169661 (1979-10-01), Yamada et al.

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