Passive Microwave Fire Detection via Black Body Emission
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Solution Overview
Problem
Current fire and intrusion detection systems often suffer from false alarms and delayed responses due to their reliance on active microwave radiation and limited ability to penetrate smoke or non-metallic materials, making them inefficient in detecting fires and intruders, especially in smoky or optically dense conditions.
Innovation Solution
A passive microwave detection system utilizing directional antennae and low noise receivers operating within internationally protected frequency bands to detect thermal radiation from fires and living bodies, allowing for rapid and accurate identification of thermal signatures through black body emission and spectral line analysis, even in smoky or misty conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Difficulty of detecting and measuring
If active microwave radiation is used for detection, then detection capability is improved, but false alarm rate increases and system reliability deteriorates
Solution Approach 1:
The patent inverts the conventional active detection approach by using passive microwave reception instead. The system receives naturally emitted microwave radiation from targets (fires, intruders, animals) without transmitting any microwave energy. This reversal eliminates false alarms caused by active transmission while maintaining detection capability through sensitive reception of thermal radiation in the 2-20 GHz range.
Solution Approach 2:
The system utilizes the target's own emitted microwave radiation for detection. Fires, living bodies, and animals naturally emit thermal radiation in the microwave frequency range, and the patent's passive receivers detect these self-emitted signals. This self-service approach eliminates the need for active transmission and the associated false alarm problems.
2Speed
If conventional detection methods are used, then detection speed is improved, but ability to penetrate smoke and non-metallic materials deteriorates
Solution Approach 1:
The patent changes the operational parameter from optical/infrared detection to microwave frequency detection (2-20 GHz). Microwave radiation has different interaction properties with smoke and non-metallic materials compared to optical methods. The system detects thermal radiation emitted by targets through smoke and non-metallic barriers, achieving both rapid detection and penetration capability that optical methods cannot provide.
3Reliability
If passive microwave reception is used, then false alarm rate is reduced and reliability is improved, but detection precision may deteriorate
Solution Approach 1:
The patent employs a multi-functional passive microwave detection system that simultaneously performs multiple detection tasks: fire detection, intruder detection, and animal detection. The system uses broadband receivers covering 2-20 GHz to detect thermal radiation from various target types, achieving reliable operation across diverse applications while maintaining sufficient detection precision through spectral analysis of emitted radiation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system achieves high performance with low false alarm rates, enabling quick detection of fires and intruders, including those hidden by smoke or behind non-metallic walls, and can pinpoint the location of individuals in need of rescue, thus enhancing fire safety and security.
Implementation Method 1
detect thermal radiation from fires and living bodies, allowing for rapid and accurate identification of thermal signatures through black body emission and spectral line analysis
Implementation Method 2
spectral emission at the hydrogen, hydroxyl and hydrogen chloride lines
Data Source
AI summary
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 arrays can be used to provide a plurality of frequency ranges that can be detected. In an interior installation, one or more receiver arrays can be placed inside a wall made of non-metallic substance and capable of passively receiving frequencies at less than 3 GHz. 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 via black box or spectral line emission at hydrogen, hydroxyl radical or HCl spectral line emission where an HCl spectral line detector may be mounted on a wall or pole and have line-of-sight view of an intruder or fire.