초록 ▼

A fire sensing system utilizing fiber optics to extend the physical range of radiation sensing elements into areas and environments which are physically inaccessible to, and/or destructive of, such sensors and their associated electronic circuitry. The fiber optics are combined with signal processin

A fire sensing system utilizing fiber optics to extend the physical range of radiation sensing elements into areas and environments which are physically inaccessible to, and/or destructive of, such sensors and their associated electronic circuitry. The fiber optics are combined with signal processing circuitry to achieve reliable fire sensing systems which present particular advantages in special applications.

대표청구항 ▼

A dual channel fire sensor system utilizing fiber optics comprising: a first detector for generating an electrical signal in response to short wavelength radiation incident upon the first detector; a second detector for generating an electrical signal in response to long wavelength radiation inciden

A dual channel fire sensor system utilizing fiber optics comprising: a first detector for generating an electrical signal in response to short wavelength radiation incident upon the first detector; a second detector for generating an electrical signal in response to long wavelength radiation incident upon the second detector; a plurality of optical fibers extending from the vicinity of said first and second detectors to remote locations to be monitored for the presence of fire or explosion; means for coupling radiation transmitted along said optical fibers to said detectors; first and second signal channels coupled respectively to said first and second detectors for processing signals from said detectors and developing an output signal indicative of a small fire upon the correlation within a predetermined range of signals from said first and second detectors; and a third signal channel coupled to only a selected one of said detectors and including means for developing an immediate output signal indicative of a fire in response to a predetermined large amplitude signal from the selected detector.