Air Pollution Sensor System for Ultra Fine Particle Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current air pollution sensor systems fail to effectively detect and mitigate ultra-fine particles (UFPs) in enclosed spaces, such as vehicles, which pose significant health hazards due to their small size and carcinogenic nature, and are often masked by other pollutants or ventilation modes.
Innovation Solution
An air pollution sensor system incorporating UFP sensors that charge particles using unipolar ions or electric fields, allowing for precise detection and filtration, and an air handling system that adjusts operations based on UFP concentrations, including electrostatically augmented filters and Faraday cages to enhance filtration efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional air pollution sensors are used to detect airborne pollutants, then general air quality can be monitored, but ultra fine particles cannot be effectively detected due to their small size and masking by other pollutants
Solution Approach 1:
The patent changes the detection parameter from direct optical or chemical sensing to electrostatic charging and electrical current measurement. By charging UFPs with unipolar ions and measuring the resulting electrical current in the Faraday cage, the system achieves precise detection of particles as small as 5-2500 nm that conventional sensors cannot detect.
Solution Approach 2:
The patent introduces unipolar ions as an intermediary substance to charge the ultra fine particles before detection. This charging process creates a measurable electrical signal from the otherwise undetectable particles, enabling precise measurement through the Faraday cage current meter while conventional sensors fail.
2Ease of operation
If the air handling system continuously draws outside air into the vehicle cabin, then ventilation and air exchange are maintained, but UFP concentrations inside the cabin increase due to polluted outside air
Solution Approach 1:
The patent implements a feedback control system where the UFP sensor continuously monitors particle concentrations inside the cabin and provides signals to the air handling control unit. Based on this feedback, the system automatically adjusts damper positions and fan speeds to minimize UFP intake while maintaining acceptable ventilation, resolving the contradiction between continuous air exchange and UFP exposure reduction.
3Object-affected harmful factors
If the air handling system operates in recirculation mode to reduce outside air intake, then UFP exposure is minimized, but air quality deteriorates due to accumulated pollutants inside the cabin
Solution Approach 1:
The patent employs dynamic operation of the air handling system, continuously adjusting between fresh air intake and recirculation modes based on real-time UFP concentration measurements. The control unit dynamically modulates damper positions and fan speeds, allowing the system to optimize the balance between minimizing UFP exposure and maintaining acceptable air quality through controlled air exchange.
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 effectively detects UFP concentrations both inside and outside the enclosure, enabling automatic adjustments to reduce inhaled pollutant levels, improving air quality and protecting human health by enhancing UFP filtration efficiency and air cleaning capabilities.
Implementation Method 1
a sensor unit (21) comprising a particle charging section (201), for charging airborne particles, in particular airborne UFPs, with unipolar ions or in an electric field
Implementation Method 2
a particle precipitation section (202), for electrostatically precipitating the charged particles onto an electrode surface, in particular onto a current meter electrode surface (219), which is connected via a sensitive current meter (221) to earth potential
Implementation Method 3
The UFP sensor comprises a Faraday cage, inside which a fibrous dust filter is suspended, said Faraday cage being connected via a sensitive current meter to earth potential
Implementation Method 4
an air cleaning unit (13), for cleaning air passing said air cleaning unit (13), in particular for removing airborne UFPs from air in an air stream
Data Source
AI summary
The disclosure relates to an air pollution sensor system incorporated in an enclosure, the enclosure including an air handling system inside an air duct, the air duct enabling a communication between air inside the enclosure and air outside the enclosure. The air duct including an air inlet for receiving air and an air outlet for releasing handled air inside the enclosure. The air pollution sensor system includes at least one ultra fine particle sensor capable of sensing particles with a diameter in a range of approximately 5-2500 nm, preferably in a range of approximately 5-1000 nm and more preferably in a range of approximately 5-500 nm inside the enclosure and providing a pollution information signal in response to the sensing of the particles. The disclosure further relates to various types of ultra fine particle sensors and air handling systems.