Passive microwave fire and intrusion detection system
First Claim
1. A method for detecting at least one of a fire and an intruder using passive reception of microwave radiation, comprising:
- passively receiving a first microwave radiation signal at a first receiver, said first receiver including a first antenna, a first frequency of said first passively received microwave radiation signal being indicative of a temperature of a source of said first passively received microwave radiation signal;
passively receiving a second microwave radiation signal at a second receiver, said second receiver including a second antenna, a second frequency of said second passively received microwave radiation signal being indicative of a temperature of a source of said second passively received microwave radiation signal, wherein said first and second frequencies are within a range of microwave frequencies protected from active transmission in a geographic area encompassing a location of said first and second receivers;
comparing said first frequency with said second frequency to determine a presence of at least one of a fire and an intruder; and
transmitting said first and second passively received microwave radiation signals to a signal processor;
said first passively received microwave radiation signal being converted to a first voltage signal;
said second passively received microwave radiation signal being converted to a second voltage signal;
said first voltage signal being subtracted from said second voltage signal to provide a resulting voltage signal; and
said presence of said at least one of said fire and said intruder being determined based on said resulting voltage signal.
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Accused Products
Abstract
A passive microwave receiver array, operating in the one meter to sub-millimeter wavelengths range and including an internationally protected range of frequencies of varying bandwidth, may be used for fire and intrusion detection. One or more receiver array can be used to provide a plurality of frequency ranges that can be detected. In an interior installation, one or more receiver array can be placed inside a wall. In other embodiments, the receiver and array can be in the form of a hand-held or wearable device. This method and apparatus achieves high performance by exploiting conventional low noise amplification block conversion circuits and provides the detection of thermal signals through clear, smoky, misty, or environmentally untenable conditions as well as the detection of fire and intrusion events through a non-metallic wall.
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Citations
20 Claims
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1. A method for detecting at least one of a fire and an intruder using passive reception of microwave radiation, comprising:
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passively receiving a first microwave radiation signal at a first receiver, said first receiver including a first antenna, a first frequency of said first passively received microwave radiation signal being indicative of a temperature of a source of said first passively received microwave radiation signal; passively receiving a second microwave radiation signal at a second receiver, said second receiver including a second antenna, a second frequency of said second passively received microwave radiation signal being indicative of a temperature of a source of said second passively received microwave radiation signal, wherein said first and second frequencies are within a range of microwave frequencies protected from active transmission in a geographic area encompassing a location of said first and second receivers; comparing said first frequency with said second frequency to determine a presence of at least one of a fire and an intruder; and transmitting said first and second passively received microwave radiation signals to a signal processor; said first passively received microwave radiation signal being converted to a first voltage signal; said second passively received microwave radiation signal being converted to a second voltage signal; said first voltage signal being subtracted from said second voltage signal to provide a resulting voltage signal; and said presence of said at least one of said fire and said intruder being determined based on said resulting voltage signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for detecting at least one of a fire and an intruder using passive reception of microwave radiation, comprising:
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passively receiving a first microwave radiation signal at a first receiver, said first receiver including a first antenna, a first frequency of said first passively received microwave radiation signal being indicative of a temperature of a source of said first microwave radiation signal; passively receiving a second microwave radiation signal at a second receiver, said second receiver including a second antenna, a second frequency of said second passively received microwave radiation signal being indicative of a temperature of a source of said second passively received microwave radiation signal, wherein said first and second frequencies are within a range of microwave frequencies protected from active transmission in a geographic area encompassing a location of said first and second receivers; and comparing said first frequency with said second frequency to determine a presence of at least one of a fire and an intruder, wherein at least one of said first and second frequencies is in a microwave range of frequencies from 300 MHz to 300 GHz, the method further comprising subtracting a known microwave radio frequency signal from said at least one of said first and second received frequencies, said known microwave radio frequency signal being from a predetermined source. - View Dependent Claims (9, 10)
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11. A system for passive microwave detection of at least one of a fire and an intruder, comprising:
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a first receiver configured to passively receive a first microwave radiation signal from a first source, a first frequency of said first passively received microwave radiation signal being indicative of a temperature of said first source; at least one second receiver configured to passively receive a second microwave radiation signal from a second source, a second frequency of said second passively received microwave radiation signal being indicative of a temperature of a source of said second passively received microwave radiation signal, wherein said first and second frequencies are within a range of frequencies protected from active microwave transmission in a geographic area encompassing a location of said first and second receivers; a signal processor, said signal processor being configured to receive said first and second passively received microwave radiation signals from said first and second receivers and being further configured to convert said first and second passively received microwave radiation signals to first and second voltages, respectively, said signal processor further being configured to subtract said second voltage signal from said first voltage signal to obtain a resulting voltage signal; wherein a presence of a fire can be determined if said resulting voltage signal is positive; and wherein a presence of a living being can be determined if said resulting voltage signal is negative. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification