Chamberless Smoke Detector Using Infrared and Electromagnetic Fields
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Solution Overview
Problem
Existing smoke detectors face issues with false alarms due to unwanted airborne particles and require maintenance to maintain cleanliness, and they are limited by the time it takes for smoke particles to reach the sensor chamber, affecting detection efficiency.
Innovation Solution
A method and apparatus that use sensors emitting infrared light or electromagnetic fields to detect smoke plumes without a physical chamber, allowing for real-time monitoring and discrimination between smoke and other entities, reducing maintenance needs and enhancing detection speed by actively seeking out smoke particles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a chamber with controlled inlet dimensions is used to prevent entry of unwanted particles, then false alarms are reduced, but smoke particles take longer to diffuse into the chamber and maintenance is required to keep inlets clean
Solution Approach 1:
The patent removes the chamber structure entirely from the smoke detector design. Sensors are exposed directly to the monitored environment, eliminating the chamber and its inlets. This extraction of the chamber component resolves the contradiction by allowing immediate smoke detection without diffusion delays while maintaining false alarm reduction through selective sensor response to smoke characteristics.
Solution Approach 2:
The patent replaces the mechanical chamber-based particle filtration system with an optical/electromagnetic field-based detection system. Infrared sensors and electromagnetic fields detect smoke particles directly in the air without requiring physical inlets or chambers, substituting mechanical structures with field-based detection that achieves both rapid detection and false alarm reduction.
2Reliability
If a chamber with controlled inlet dimensions is used to prevent entry of unwanted particles, then false alarms are reduced, but maintenance is required to maintain inlet cleanliness
Solution Approach 1:
By removing the chamber and its inlets entirely, the patent eliminates the components that require maintenance. Sensors are positioned to detect smoke directly in the air without enclosed spaces where particles can accumulate, thereby eliminating the need for maintenance while maintaining reliability through direct environmental sensing.
Solution Approach 2:
The chamberless design allows the sensor environment to self-clean continuously as air flows freely around the sensors. There are no enclosed chambers where particles can settle and require manual cleaning, as the open design prevents particle accumulation while maintaining sensor functionality.
3Speed
If sensors without a chamber are used to detect smoke directly in the air, then detection speed is improved and maintenance is minimized, but discrimination between smoke and other entities requires additional processing
Solution Approach 1:
The patent replaces mechanical particle filtration with optical and electromagnetic field-based discrimination. Infrared sensors detect the thermal signature of smoke, while electromagnetic fields interact with smoke particles differently than other airborne particles. This substitution enables rapid detection with automated discrimination through physical property differences rather than mechanical separation.
Solution Approach 2:
The patent utilizes changes in optical and electromagnetic parameters to discriminate smoke from other entities. By monitoring specific wavelengths of infrared radiation and electromagnetic field interactions, the system distinguishes smoke based on its unique physical properties, enabling fast detection with processing based on physical parameter differences rather than complex mechanical separation.
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
This approach reduces false alarms, minimizes maintenance, and speeds up smoke detection by actively monitoring for smoke plumes, improving accuracy and reducing the impact of smoke transport dynamics on detection time.
Implementation Method 1
Smoke detectors, such as commercial smoke detectors, use infrared light scattering or ionization-based techniques
Implementation Method 2
the second plurality of signals includes infrared (IR) light
Implementation Method 3
Smoke detectors, such as commercial smoke detectors, use infrared light scattering or ionization-based techniques
Implementation Method 4
A method and apparatus that use sensors emitting infrared light or electromagnetic fields to detect smoke plumes
Data Source
AI summary
Open-chamber smoke detector and detection method. An elecromagnetic emitter emits radiation, a sensor receives the signal after it has travelled through the monitored area and analyses it to determine whether smoke is present by comparison with a reference signal representative of a smoke plume. An alarm condition is signaled when an evolution in the obtained data corresponds to the reference profile within a threshold amount.