Integrating Sphere Optical Particle Counter
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Solution Overview
Problem
Traditional optical particle counters (OPCs) are expensive, bulky, and labor-intensive due to high-cost optical components and complex alignment processes, making them unsuitable for efficient micron-sized particulate matter (PM) measurement in a compact and cost-effective manner.
Innovation Solution
A compact optical particle counter design featuring an integrating sphere with a light source, photo-detector, and channels for air inlet and outlet, housed in injection-molded components, which eliminates the need for bulky optical elements and uses a heater for aerosol sample transit, allowing for accurate PM concentration measurement with reduced size and component costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional optical components and alignment processes are used in OPCs, then measurement precision is maintained, but device complexity and manufacturing cost increase significantly
Solution Approach 1:
The patent integrates the light source, integrating sphere, photo-detector, and heater into a single compact module, eliminating the need for separate bulky optical components and complex alignment procedures. This merging maintains measurement precision while significantly reducing device complexity and manufacturing cost.
Solution Approach 2:
The compact module serves multiple functions simultaneously: the light source provides illumination, the integrating sphere collects and distributes light, the photo-detector measures scattered light, and the heater maintains temperature. This multi-functionality reduces the number of separate components needed, simplifying the overall device while maintaining measurement accuracy.
2Measurement precision
If traditional optical components are used in OPCs, then measurement precision is maintained, but device size and weight increase
Solution Approach 1:
By combining all optical components into a single integrated module, the patent dramatically reduces the overall device weight while maintaining measurement precision. The compact design eliminates the need for multiple separate heavy optical elements and their associated mounting structures.
3Measurement precision
If traditional optical components and assembly processes are used, then measurement precision is maintained, but manufacturing cost increases
Solution Approach 1:
The integrated module design allows for simplified manufacturing processes with fewer assembly steps. By combining components into a single unit, the patent reduces labor-intensive alignment and calibration procedures, thereby lowering manufacturing costs while maintaining measurement precision.
Solution Approach 2:
The patent employs cost-effective materials and components in the integrated module, such as standard LED light sources and commercially available photo-detectors, replacing expensive specialized optical components. This approach maintains sufficient measurement precision while significantly reducing manufacturing costs.
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 solution provides a cost-effective, small-scale OPC capable of measuring PM concentration with high consistency, suitable for personal monitoring and integration into various devices, while maintaining low power requirements and production costs, enabling efficient air quality data logging and wireless communication.
Implementation Method 1
Particles suspended in the aerosol sample scatter light when hit by the laser beam. The light scattered by the particles hits a photo-detector that converts the scattered light into an electrical signal.
Implementation Method 2
The light scattered by the particles hits a photo-detector that converts the scattered light into an electrical signal.
Implementation Method 3
The heater is arranged to exert a convection force on the aerosol sample entering the integrating sphere and hence supporting its transit through the integrating sphere.
Data Source
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AI summary
An optical particle counter ( 100 ) includes a light source, an integrating sphere (104), a light stop (105), a photo-detector (106), a channel for air inlet ( 107 ), and a channel for air outlet (108). The light source is arranged to focus the light beam in the center of the integrating sphere (104), The light stop (105) is arranged to stop the light beam after exiting the integrating sphere (104 ). The channels for air inlet (107) and outlet ( 108 ) are configured to allow an aerosol sample to enter the integrating sphere ( 104 ), cross the light beam, and exit.