Microprocessor-controlled fire sensor
First Claim
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1. A microprocessor controlled fire sensor system comprising:
- a first detector for generating electrical signals in response to incident radiation within a predetermined first spectral band;
a second detector for generating electrical signals from incident radiation within a predetermined second spectral band;
first and second amplifiers respectively connected to the first and second detector for amplifying said signals from the first and second detectors, respectively, to levels compatible with microprocessor inputs;
a microprocessor including a central processing unit with memory (CPU) coupled to receive signals corresponding to the outputs of said amplifiers and process said signals in accordance with a pre-established computer program;
a multiplexer and an A/D converter connected in series between the amplifiers and the CPU to sequentially apply to the CPU digital signals corresponding to analog signals derived from the first and second detectors; and
means within the microprocessor for comparing the received signals with at least one preselected threshold stored in the memory, with said means generating an output signal for initiating release of fire suppressant when at least one of the received signals exceeds said one preselected threshold.
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Abstract
A fire sensor that can perform a sophisticated analysis of the outputs of radiant energy detectors, while minimizing size, weight, and cost, by employing a microprocessor to analyze the detector outputs. In one embodiment, an Intel 2920 Signal Processor is utilized as the microprocessor. An alternative embodiment incorporates an RCA 1802 microprocessor to achieve fire sensing while discriminating against false signal radiation.
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20 Claims
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1. A microprocessor controlled fire sensor system comprising:
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a first detector for generating electrical signals in response to incident radiation within a predetermined first spectral band; a second detector for generating electrical signals from incident radiation within a predetermined second spectral band; first and second amplifiers respectively connected to the first and second detector for amplifying said signals from the first and second detectors, respectively, to levels compatible with microprocessor inputs; a microprocessor including a central processing unit with memory (CPU) coupled to receive signals corresponding to the outputs of said amplifiers and process said signals in accordance with a pre-established computer program; a multiplexer and an A/D converter connected in series between the amplifiers and the CPU to sequentially apply to the CPU digital signals corresponding to analog signals derived from the first and second detectors; and means within the microprocessor for comparing the received signals with at least one preselected threshold stored in the memory, with said means generating an output signal for initiating release of fire suppressant when at least one of the received signals exceeds said one preselected threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification