Multi-Sensor Particle Counter for Wide-Range Air Quality Monitoring
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Solution Overview
Problem
Existing particle counters are limited in their ability to detect a wide range of particle sizes, are difficult to calibrate, and lack means for detecting equipment failure.
Innovation Solution
A system with multiple sensor blocks and a common counter board that allows for detection of a wide range of particle sizes, includes redundancy for failure notification, calibration notification, and enhanced dynamic range, and can be integrated into portable devices for personal air quality monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional particle counters with hardware-based pulse discrimination are used, then noise rejection is achieved, but the scope of detectable particle sizes is limited and calibration becomes difficult
Solution Approach 1:
The system divides particle detection into multiple discrete size bins (e.g., 0.3-0.5 microns, 0.5-1.0 microns, 1.0-2.0 microns, etc.), with each bin having dedicated pulse height thresholds. This segmentation allows the system to detect a wide range of particle sizes using simple hardware comparisons rather than complex algorithms, resolving the contradiction between detection range and calibration complexity.
Solution Approach 2:
The system changes the discrimination parameter from continuous pulse analysis to discrete pulse height bins with fixed thresholds. Each size bin has predetermined minimum and maximum pulse heights, transforming the calibration problem into setting fixed parameters rather than complex curves, thereby simplifying calibration while expanding detectable particle size range.
2Adaptability or versatility
If multiple sensor blocks are added to expand detection range, then particle size coverage improves, but device complexity increases
Solution Approach 1:
Multiple sensor blocks (e.g., Sensor Block 1, Sensor Block 2, Sensor Block 3) are merged into a single integrated counter board that processes all sensors simultaneously. The counter board uses a unified pulse height discrimination system with shared size bins, combining multiple detection capabilities without proportionally increasing overall system complexity.
Solution Approach 2:
The counter board is designed with universal functionality to handle multiple sensor blocks and multiple particle size ranges simultaneously. A single counter board can process signals from different sensor types and configurations, making the system adaptable to various particle size detection needs without requiring separate dedicated circuits for each function.
3Reliability
If redundancy is implemented for failure detection, then system reliability improves, but device complexity increases
Solution Approach 1:
The system implements feedback mechanisms where the counter board continuously monitors sensor signals and provides failure notifications when anomalies are detected. The feedback loop compares expected signal patterns against actual readings, automatically identifying sensor failures without requiring complex external monitoring equipment.
Solution Approach 2:
The counter board performs self-diagnosis by monitoring its own sensor inputs and detecting failures autonomously. The system uses built-in redundancy where each sensor's performance is evaluated against predefined criteria, allowing the system to self-identify problematic components without external intervention, thereby improving reliability with minimal added complexity.
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 easy calibration and detection of a wide range of particle sizes, provides failure notification, and allows for real-time personal air quality monitoring, potentially preventing health issues by alerting users to worsening air quality.
Implementation Method 1
A particle counter has at least one size channel and popular counters can have 6 or more channels. Typically these size channels discriminate pulses based on the pulse height of the incoming signal.
Implementation Method 2
The pulse height refers to the peak voltage of the signal. Sometimes there is also rudimentary discrimination of pulse width, often in hardware.
Implementation Method 3
U.S. Non-Provisional application Ser. No. 14/214,903, filed herewith on Mar. 15, 2014, titled MIXED-MODE PHOTO-AMPLIFIER FOR PARTICLE COUNTER by inventors David Pariseau and Ivan Horban
Data Source
AI summary
An airborne, gas, or liquid particle sensor with multiple particle sensor blocks in a single particle counter. Each sensor would sample a portion of the incoming airstream, or possibly a separate airstream. The various counters could be used separately or in concert.