Particle Detector Photo-Responsive Material Scattering
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Solution Overview
Problem
Current bioaerosol detection technologies are costly, complex, and require precision optics, making them expensive and difficult to deploy in dense sensor networks for real-time monitoring of aerosol and bioaerosol concentrations, particularly in environments like hospitals and manufacturing facilities.
Innovation Solution
A particle detector system that uses a flexible photo-responsive material surrounding a detection cavity to collect measurement light from particles at multiple angles, reducing the need for precision optics and increasing sensitivity through a large-area detection approach, while also incorporating beam shaping optics and light traps to enhance signal-to-noise ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If precision optics are used to collect and focus scattered light, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent transitions from point-detector measurement to an imaging detector that captures light scattering information across a two-dimensional spatial domain. The imaging detector records the angular distribution of scattered light, converting a complex optical focusing problem into a direct spatial measurement problem that eliminates the need for precision optics.
Solution Approach 2:
The patent replaces the mechanical/optical system of lenses and mirrors with a computational approach. The imaging detector captures the raw spatial distribution of scattered light, and image processing algorithms reconstruct particle size and concentration information, substituting physical optical precision requirements with computational analysis.
2Measurement precision
If precision optics are used to focus scattered light, then measurement precision is improved, but manufacturing cost increases
Solution Approach 1:
The patent employs inexpensive imaging detectors (such as CMOS or CCD cameras) that can be mass-produced using standard semiconductor manufacturing processes, replacing expensive specialized photodetectors. These imaging detectors are significantly cheaper while maintaining sufficient measurement capability through computational image processing.
Solution Approach 2:
The patent substitutes expensive precision optical components with a simpler detector arrangement that relies on computational methods. The imaging detector captures scattered light patterns, and algorithms extract particle information, eliminating the need for costly optical benches, alignment mechanisms, and precision lenses.
3Measurement precision
If a single particle counter with focused light stream is used, then measurement precision is improved, but device complexity and deployment difficulty increase
Solution Approach 1:
The patent divides the detection task into two independent components: (1) an imaging detector that captures the spatial distribution of scattered light, and (2) computational algorithms that process the images to extract particle information. This segmentation allows the hardware to be simple and easy to deploy, while the computational processing handles the measurement complexity.
Solution Approach 2:
The patent replaces complex optical focusing and particle stream manipulation with a field-of-view approach. The imaging detector captures scattered light from particles within its field of view without requiring precise optical focusing or particle stream confinement, making the device easier to implement and deploy in sensor networks.
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 a cost-effective and simplified method for detecting aerosol and bioaerosol concentrations with improved sensitivity and reduced noise, enabling more widespread and efficient monitoring of airborne particles.
Implementation Method 1
measurement of light scattering and autofluorescence
Implementation Method 2
autofluorescence (or intrinsic fluorescence) excited by ultraviolet (UV) and blue light
Implementation Method 3
The photon detectors are made from silicon or photocathode materials (e.g., indium gallium arsenide) that undergo the photoelectric effect (convert photons to electrons)
Data Source
AI summary
A particle detector includes a housing, a light source, and a photo-responsive material. The housing includes a sample inlet and a sample outlet, and encloses a detection cavity. The light source directs irradiating light along a longitudinal axis to particles of a sample fluid flowing in the detection cavity. The photo-responsive material surrounds at least a portion of the detection cavity, and receives measurement light propagating from the particles in a plurality of measurement light paths angled relative to the longitudinal axis. The particle detector may be utilized to measure scattered light and/or light emitted due to autofluorescence. Fluids sampled may include aerosols, bio-aerosols, and liquids.