Pollen Sensor Array Using Humidity Detection
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Solution Overview
Problem
Existing pollen sensors are costly and inaccurate due to factors like surface characteristics and humidity effects, which complicate the differentiation between pollen and other particles based on size and size distribution.
Innovation Solution
A low-cost particle or pollen sensor using an array of relative humidity sensors and a processor to detect changes in humidity and identify pollen types based on hygroscopicity, size, and shape, with a cleaning mechanism involving a fan and vibrator for effective particle removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Difficulty of detecting and measuring
If optical scattering sensors are used to detect particle size and polarization signatures, then pollen detection capability is improved, but measurement precision deteriorates due to surface characteristics and humidity effects
Solution Approach 1:
The invention extracts and isolates the hygroscopicity characteristic of pollen from other particle properties. By using humidity sensors to specifically detect water uptake behavior, the system separates this key identifying feature from confounding factors like surface characteristics and size variations, enabling precise pollen detection independent of these interfering variables.
Solution Approach 2:
The invention changes the detection parameter from optical properties (scattering, polarization) to hygroscopic properties (water uptake). This parameter transformation allows detection of pollen based on its unique ability to absorb water vapor, which is not significantly affected by surface characteristics or ambient humidity variations, thereby improving measurement precision.
2Measurement precision
If professional size distribution sensors are used to accurately determine particle size, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The invention replaces complex mechanical or optical sizing systems with a simpler humidity-based detection system. Instead of using expensive particle image analyzers or optical scattering equipment, the system uses arrays of humidity sensors to detect water uptake patterns, achieving particle identification and size estimation through a less complex, more cost-effective mechanism.
Solution Approach 2:
The invention transforms the measurement approach from direct physical dimension measurement to indirect inference through hygroscopic behavior. By measuring water uptake characteristics rather than directly measuring particle dimensions, the system achieves size determination capability with simpler, lower-cost sensors.
3Measurement precision
If optical sensors account for surface characteristics and humidity effects, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The invention extracts and utilizes the humidity interaction property of pollen as the primary detection mechanism. By focusing solely on hygroscopicity rather than attempting to account for multiple factors (surface characteristics, size, shape) simultaneously, the system simplifies the detection approach while maintaining or improving precision through this isolated, dominant characteristic.
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 detection and differentiation of pollen types with improved cost-effectiveness and precision by utilizing relative humidity sensors to measure water uptake and size distribution, providing reliable particle size information and type identification.
Implementation Method 1
The invention is based on distinguishing the hygroscopicity or water content of pollen or other particles by making use of relative humidity sensors
Implementation Method 2
with a cleaning mechanism involving a fan and vibrator for effective particle removal
Data Source
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AI summary
A particle or pollen sensor comprises an array of relative humidity sensors. A change in relative humidity is representative of a particle or pollen in contact with one or more of the sensors. A size and/or shape of a particle or pollen in contact with one or more of the sensors is optionally also determined based on the number and/or configuration of sensors. From this information, a particle or pollen type is determined.