Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1980-10-27
1983-04-05
Caldwell, Sr., John W.
Communications: electrical
Condition responsive indicating system
Specific condition
250381, 340636, 34081531, G08B 1710
Patent
active
043792901
ABSTRACT:
In an alarm installation containing a central evaluation unit and alarm devices arranged remotely therefrom, the transmission of energy from a radiation source and the reporting back of the signal occurs exclusively according to optical principles by means of radiation conducting elements, so-called light guides or conductors, by means of which the alarm devices are connected with the evaluation device. The alarm devices contain a preferably high-ohm sensor element, for instance a smoke-sensitive ionization chamber, whose operating voltage is infed by means of a solar cell which is irradiated by a light guide and whose output signal is fed back to the evaluation device by means of a high-ohm electrical transducer and a light guide. Such type alarm installation preferably is used for fire detection purposes, for gas, smoke temperature detection or intrusion protection, and is particularly suitable for use in an explosion-endangered environment or one subjected to electrical disturbances.
REFERENCES:
patent: 3619612 (1971-11-01), Belke et al.
patent: 3805006 (1974-04-01), Chijuma et al.
patent: 4071753 (1978-01-01), Fulenwider et al.
patent: 4075512 (1978-02-01), Rast, Jr. et al.
patent: 4158144 (1979-06-01), Krause
patent: 4290146 (1981-09-01), Adolfsson et al.
The Bell System Technical Journal, vol. 58, No. 7, Sep. 1979, the Article of R. C. Miller et al., Entitled "Optically Powered Speech Communication Over a Fiber Lightguide", pp. 1735-1741.
Muggli Jurg
Pfister Gustav
Caldwell Sr. John W.
Cerberus AG
Kleeman Werner W.
Myer Daniel
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