Light Scattering Intensity Field Imaging Sensor for In Situ Aerosol Analysis

Area of Science:

• Atmospheric chemistry and physics
• Fuel combustion
• Human health
• Optical sensing technology

Background:

• Aerosols are crucial in diverse scientific fields, impacting atmospheric conditions, combustion processes, and human health.
• Existing particle sizing instruments are often bulky, expensive, or lack the necessary measurement channels for accurate size distribution analysis.
• There is a need for portable, cost-effective, and accurate aerosol characterization tools for field applications.

Purpose of the Study:

• To develop and validate a novel optical sensing method for analyzing aerosol particle size distribution.
• To design a portable and low-cost prototype sensor based on the proposed method.
• To assess the accuracy and potential of the developed sensor for routine field measurements.

Main Methods:

• Utilizing the light scattering intensity field (LSIF), which captures scattered light in all directions around particles.
• Employing the Tikhonov regularization algorithm to retrieve particle size distribution from LSIF data.
• Designing a prototype sensor that collects LSIF using a parabolic reflector and projects it onto an image sensor via telecentric lenses.

Main Results:

• The proposed optical sensing method effectively analyzes aerosol particle size distribution.
• Experimental tests with di-ethyl-hexyl-sebacate aerosols demonstrated a relative measurement error within ±10% for the LSIF.
• The developed prototype sensor integrates a cost-effective and portable design.

Conclusions:

• The developed optical sensing method and prototype sensor provide an accurate and efficient means for aerosol particle size distribution analysis.
• The system's portability, low cost, and demonstrated accuracy make it suitable for routine field measurements.
• This technology holds significant potential for advancing aerosol research and monitoring across various scientific disciplines.