Personal Air Quality Particle Counter With Segmented Sensing
Find Innovative SolutionsGenerate Solutions
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 the detection of a wide range of particle sizes, includes redundancy for failure notification, and enables easy calibration through count uniformity checks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional particle counters with hardware-based pulse discrimination are used, then the system provides simple go/no-go qualification for particles, but the system is limited in detecting a wide range of particle sizes and is difficult to calibrate
Solution Approach 1:
The patent divides the particle detection system into multiple sensor blocks, each with its own photo-amplifier and counter board. Each sensor block can independently detect particles within a specific size range, allowing the system to cover a wide detection range by combining multiple segmented sensors rather than using a single complex sensor
Solution Approach 2:
The counter board is designed with universal functionality to handle multiple sensor blocks and process signals from different particle size ranges. The system can be configured to detect various particle sizes by adjusting software parameters rather than requiring different hardware configurations, achieving multi-functionality through a unified platform
2Ease of operation
If hardware-based pulse discrimination with fixed thresholds is used, then the system provides simple noise rejection, but the system lacks flexibility for calibration and failure detection
Solution Approach 1:
The system implements feedback mechanisms where the counter board continuously monitors particle counts from multiple sensor blocks and compares them against expected uniformity patterns. This feedback allows the system to automatically detect calibration drift or sensor failures by identifying anomalies in count uniformity across different size ranges
Solution Approach 2:
The system performs preliminary calibration checks by analyzing count uniformity across multiple sensor blocks before actual particle detection begins. This preliminary action establishes baseline performance metrics that enable easy recalibration and failure detection during operation without requiring complex external calibration procedures
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 of a wide range of particle sizes with enhanced sensitivity and reliability, providing real-time monitoring and early warning of air quality changes.
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.
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.