Portable Air Quality Sensor Using Light Scattering Analysis
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for assessing air quality are limited in providing real-time, localized data, often relying on regional and time-specific measurements that may not accurately reflect individual exposure to air pollutants like fine dust, formaldehyde, and bacteria, leading to health issues such as sick building syndrome.
Innovation Solution
A portable apparatus that uses a light source unit to emit incident light of a predetermined wavelength, scattering off air particles to generate scattered light, which is detected and analyzed using equations involving variables like wavelength, refractive index, and angle to provide air quality indicator information on particle size and concentration, integrated with a control and display unit for user-friendly output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If regional and time-specific measurements are used for air quality assessment, then measurement coverage is simplified, but measurement precision and real-time localized data accuracy deteriorate
Solution Approach 1:
The patent replaces complex mechanical sampling and laboratory analysis systems with optical detection methods. A light source emits light through the air sample, and a photodetector measures light scattering and absorption to determine particle concentration and size, eliminating the need for complex mechanical air sampling equipment while achieving real-time localized measurements
Solution Approach 2:
The patent changes the measurement parameter from direct particle mass measurement to optical property measurement (light scattering and absorption). By measuring how particles affect light transmission and scattering at different wavelengths, the system derives particle concentration and size information optically, enabling real-time measurements with simpler equipment
2Loss of time
If portable apparatus with light source and detection units is used, then real-time localized air quality data is obtained, but device complexity increases
Solution Approach 1:
The patent divides the air quality measurement function into separate modular units: a light source unit, a detection unit with photodetectors, and a control unit. These modules can be independently configured and combined, allowing the system to achieve real-time measurement capability while maintaining manageable device complexity through functional segmentation
Solution Approach 2:
The patent designs the portable apparatus to perform multiple measurement functions using a single integrated system. The same light source and detection units measure both particle concentration and size distribution by analyzing light scattering at different angles and wavelengths, eliminating the need for separate measurement devices and reducing overall system 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 direct and easy measurement of air quality around the user, providing accurate and timely data on particle sizes and concentrations, addressing the limitations of existing methods by offering personalized and real-time air pollution information.
Implementation Method 1
The emitted incident light is scattered by particles in the air to generate scattered light
Data Source
AI summary
A portable apparatus for estimating air quality is provided. The portable apparatus includes a light source unit suitable for emitting incident light having a predetermined wavelength toward air to generate scattered light which is reflected by particles in the air, a light detection unit suitable for collecting information on the scattered light, and an arithmetic unit suitable for analyzing the information on the scattered light which is collected by the light detection unit. The arithmetic unit generates information on a size and a concentration of the particles in the air. Related methods are also provided.