Suspension Particle Sensor with Aperture Segmentation for PM2.5 Accuracy
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Solution Overview
Problem
Current suspension particle sensing apparatuses fail to accurately distinguish particles with different diameters, particularly PM 2.5, leading to difficulties in detecting concentration within specific diameter ranges.
Innovation Solution
A suspension particle sensing apparatus comprising a flow channel, a concentration sensor, and a filtering assembly with a suspension particle filtering structure having through holes of specific apertures, along with a concentration compensation system to calibrate detection values based on airflow rate and concentration variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a suspension particle concentration sensor is used to detect particles in the atmosphere, then the concentration of suspension particles can be measured, but the sensor cannot accurately distinguish particles with different diameters
Solution Approach 1:
The patent divides the particle detection function into multiple segments by introducing filtering assemblies with different aperture sizes (first filtering assembly with first aperture, second filtering assembly with second aperture). Each filtering assembly allows particles of specific size ranges to pass through to the sensor, enabling the sensor to measure different particle size segments separately. This segmentation approach transforms the inability to distinguish particle sizes into a systematic method for measuring different size ranges.
Solution Approach 2:
The filtering assemblies act as intermediaries between the atmosphere and the concentration sensor. These filters with specific apertures selectively allow particles of certain sizes to reach the sensor while blocking others. The intermediary filtering structure enables the sensor to indirectly detect particle size distribution by measuring concentrations at different filter stages, solving the sensor's inherent limitation in size discrimination.
2Measurement precision
If a filtering assembly with specific aperture is introduced to filter particles, then particle size selection is improved, but the filtering structure may become jammed by larger particles
Solution Approach 1:
The patent segments the filtering function into multiple independent filtering assemblies with different aperture sizes arranged in sequence. The first filtering assembly with larger aperture handles coarse particle filtration, while the second filtering assembly with smaller aperture handles fine particle filtration. This segmentation prevents any single filter from becoming completely blocked, as each filter only needs to handle particles within its size range, maintaining system reliability.
Solution Approach 2:
The filtering assemblies are arranged in a preliminary action sequence where the first filtering assembly with larger aperture is positioned before the second filtering assembly with smaller aperture. This preliminary filtration removes larger particles that would otherwise clog the finer filter, ensuring the second filter maintains its reliability and detection accuracy over extended operation periods.
3Adaptability or versatility
If multiple filtering assemblies with different apertures are used to detect different particle sizes, then particle size discrimination capability is improved, but the device complexity increases
Solution Approach 1:
The patent makes the filtering assembly a multi-functional component that serves both filtration and particle size classification functions. By designing filters with specific aperture sizes that correspond to PM2.5 and PM10 standards, the same filtering structure simultaneously removes particles and enables the sensor to distinguish different particle size ranges. This universality reduces the need for separate classification mechanisms, controlling device complexity.
Solution Approach 2:
The filtering assemblies are arranged in a nested configuration where the first filtering assembly with larger aperture encompasses the second filtering assembly with smaller aperture. This nesting allows multiple particle size detection functions to be integrated within a compact structure, enabling the detection of different particle size ranges without proportionally increasing the overall device volume and 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
The apparatus effectively filters and measures PM 2.5 concentrations with improved accuracy, enhancing detection precision and maintaining apparatus functionality by preventing jamming through compensation and removal of larger particles.
Implementation Method 1
a suspension particle filtering structure (120). The second opening (P2) is covered by the suspension particle filtering structure (120)
Implementation Method 2
a suspension particle concentration sensor (100)
Data Source
AI summary
A suspension particle sensing apparatus includes a first flow channel, a suspension particle concentration sensor and a suspension particle filtering assembly. The first flow channel has a first entrance and a first exit. The suspension particle concentration sensor is disposed in the first flow channel, and is located between the first entrance and the first exit. The suspension particle filtering assembly is disposed at the first entrance, and includes a casing and a suspension particle filtering structure. The casing has a first opening and a second opening. The first opening is communicated with the first entrance of the first flow channel. The suspension particle filtering structure covers the second opening.