Low-Cost Particle Sensor with Piezoelectric Microblower
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Solution Overview
Problem
Current particle monitoring technologies are expensive, labor-intensive, and lack the ability to provide accurate, real-time size segregated particle mass concentrations over a wide geographical area, with existing sensors requiring frequent calibration and being sensitive to environmental factors.
Innovation Solution
A low-cost, compact particle sensor system that incorporates a piezoelectric microblower and filter element for accurate low-concentration measurements, combined with a remote calibration method using a reference instrument to generate calibration factors, allowing for widespread deployment and simplified maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If expensive, traditional particle monitoring technologies are used, then measurement precision and reliability are improved, but device cost and operational expenses increase significantly
Solution Approach 1:
The patent employs low-cost, disposable particle sensors that can be frequently replaced rather than maintaining expensive, complex instrumentation. These inexpensive sensors enable widespread deployment across multiple locations without significant financial burden, trading sensor longevity for affordability and ease of replacement.
Solution Approach 2:
The patent uses multiple identical, low-cost sensor units deployed across different locations to replicate monitoring capabilities. Instead of relying on a single expensive instrument, the system creates a network of simplified sensor copies that collectively provide comprehensive coverage with comparable aggregate precision.
2Measurement precision
If frequent calibration is performed to maintain measurement accuracy, then measurement precision is improved, but labor requirements and operational complexity increase
Solution Approach 1:
The patent implements self-calibrating sensor systems that automatically adjust and maintain their own accuracy without requiring manual intervention. The sensors perform self-diagnosis and self-correction, eliminating the need for labor-intensive calibration procedures while maintaining measurement precision.
Solution Approach 2:
The patent incorporates factory pre-calibration and pre-adjustment of sensors before deployment. This preliminary calibration work is performed during manufacturing, so sensors arrive ready-to-use with accurate baseline calibration, eliminating or reducing the need for field calibration labor.
3Measurement precision
If manual calibration procedures are used, then measurement accuracy can be maintained, but productivity and deployment speed decrease
Solution Approach 1:
The patent replaces manual, mechanical calibration procedures with automated electronic calibration systems. Digital calibration data is transmitted and applied automatically, eliminating the need for physical adjustment mechanisms and manual intervention, thereby accelerating deployment while maintaining accuracy.
Solution Approach 2:
The patent uses software-based calibration parameter adjustments rather than physical modifications. Calibration involves changing digital parameters and lookup tables within the sensor firmware, which can be rapidly updated remotely without mechanical intervention, significantly improving deployment productivity.
4Device complexity
If a limited number of monitoring locations are used, then operational cost is reduced, but coverage area and data representativeness decrease
Solution Approach 1:
The patent divides the monitoring system into numerous independent, low-cost sensor nodes distributed across the target area. Instead of one or two expensive instruments, the system segments monitoring into many small, affordable units that collectively provide comprehensive geographical coverage while keeping individual and total costs manageable.
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 provides accurate, real-time particle mass concentration measurements across a wide geographical area at a lower cost, reducing operational expenses and enabling frequent calibration without the need for labor-intensive processes.
Implementation Method 1
a piezoelectric microblower adapted to periodically push air through the flow channel of the particle sensor
Implementation Method 2
The photometer is a device that produces an electrical signal that varies with the intensity of scattered light received from a particle or an ensemble of particles
Implementation Method 3
a filter element adapted to filter a sampled particle aerosol to provide filtered air
Data Source
AI summary
There is disclosed a field calibratable particle sensor solution in a low-cost, very compact form factor. This makes a low-cost sensor more accurate for low-concentration pollution measurements and decreases the cost of pollution measurement systems having a wide geographic coverage. In a related embodiment, the invention illustrates a method and system to remotely and automatically calibrate one or more of the low cost sensors disclosed herein as well as other commercially available sensors (such as optical particle counters, photometers etc.) against a reference instrument (such as a beta attenuation monitor) which may or may not be physically located in the same place as the individual sensors. The method may require minimum (or no) user interaction and the calibration period is adjustable periodically.