Dual Wavelength Detector for Particle Differentiation
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Solution Overview
Problem
Conventional life safety devices, such as smoke detectors, often fail to distinguish between hazardous conditions and nuisance conditions like dust or steam, leading to frequent false alarms due to light scattering principles used for detection.
Innovation Solution
A detection apparatus employing a control system with a light source emitting multiple wavelengths of light, such as visible and infrared, and a light sensing device to measure refracted light, processed by a control device to differentiate between hazardous and nuisance particles based on refraction patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If light scattering detection is used to detect hazardous conditions, then detection sensitivity is improved, but false alarm rate increases due to inability to distinguish nuisance particles
Solution Approach 1:
The patent applies parameter changes by using multiple light wavelengths (e.g., 850nm infrared and 650nm visible red) to probe particle properties. Different particle types (smoke vs. dust/steam) exhibit different scattering characteristics at different wavelengths, enabling differentiation between hazardous and nuisance particles while maintaining detection sensitivity
Solution Approach 2:
The patent introduces an intermediary classification mechanism that uses the light scattering patterns at multiple wavelengths as intermediate data to distinguish particle types. This intermediary step between detection and alarm generation allows the system to filter out false alarms from nuisance particles while maintaining sensitivity to hazardous particles
2Device complexity
If single wavelength light detection is used, then device complexity is reduced, but particle type differentiation capability is lost
Solution Approach 1:
The patent implements multi-functionality by using a single light source that emits multiple wavelengths (e.g., dual LED or laser source) to perform both simple detection and particle classification functions. This universal approach allows one detection system to accomplish multiple tasks: detecting particle presence, identifying particle type, and triggering appropriate alarms, thereby maintaining simplicity while gaining differentiation capability
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
Enables accurate differentiation between hazardous and nuisance particles, reducing false alarms and improving the reliability of detection systems by determining the type of particles present in the monitored area.
Implementation Method 1
measuring a refracted portion of the first light and measure a refracted portion of the second light
Data Source
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AI summary
A control system of a detection apparatus for monitoring a condition of an area, the control system including at least one light source operable to selectively emit at least one of a first light having a first wavelength and a second light having a second wavelength. At least one light sensing device is operable to measure a refracted portion of the first light and measure a refracted portion of the second light to determine a type of particle present within the area.