Light Guide Distributes Illumination for Photometric Analyzer
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Solution Overview
Problem
Existing photometric particle analyzers face challenges in maximizing operational runtime while minimizing size and weight, particularly in portable instruments used for monitoring health effects of air pollution, where power consumption and size optimization are critical.
Innovation Solution
The apparatus features a substrate holding assembly with a movable housing system that secures a substrate and uses a light guide with multiple branches to distribute light evenly across the substrate, allowing for efficient analyte characterization and extended operational runtime with reduced power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple LED emitters are used to illuminate the filter, then the optical stability and measurement precision are improved, but the power consumption and device weight increase
Solution Approach 1:
Multiple LED emitters are merged into a single integrated lighting assembly that illuminates multiple portions of the filter simultaneously. This combining approach maintains the measurement precision benefits of multi-point illumination while reducing overall power consumption compared to using separate lighting systems for each measurement location.
Solution Approach 2:
The lighting assembly serves multiple functions: it illuminates both the analytical area and the reference area of the filter, and can illuminate multiple portions of the filter at once. This multi-functionality allows a single light source to perform what would traditionally require multiple separate light sources, thereby reducing power consumption while maintaining measurement precision.
2Measurement precision
If multiple LED emitters are used to illuminate the filter, then the optical stability and measurement precision are improved, but the device size and weight increase
Solution Approach 1:
Multiple LED emitters are merged into a single integrated lighting assembly that illuminates multiple portions of the filter simultaneously. This combining approach maintains the measurement precision benefits of multi-point illumination while reducing overall device weight compared to using separate lighting systems for each measurement location.
Solution Approach 2:
The lighting assembly serves multiple functions: it illuminates both the analytical area and the reference area of the filter, and can illuminate multiple portions of the filter at once. This multi-functionality allows a single light source to perform what would traditionally require multiple separate light sources, thereby reducing device weight while maintaining measurement precision.
3Productivity
If a roll of filter material is used that can be moved to a clean portion when heavily loaded, then the productivity and continuous operation capability are improved, but the device complexity and size increase
Solution Approach 1:
The filter holder is designed to dynamically advance the filter roll as particles accumulate, moving the measurement area to a clean portion of the filter. This dynamic adjustment allows continuous operation and maintains productivity without requiring complex automatic filter replacement mechanisms, thereby achieving high productivity with moderate device complexity.
4Ease of operation
If the instrument is miniaturized for personal exposure monitoring, then the portability and ease of operation are improved, but the power consumption and measurement precision may worsen
Solution Approach 1:
The filter is divided into multiple independent measurement portions, each with its own reference area. This segmentation allows the instrument to perform multiple measurements across different filter sections, maintaining measurement precision even in a miniaturized design by distributing the measurement function across multiple small zones rather than requiring a single large measurement area.
Solution Approach 2:
The lighting assembly serves multiple functions: it illuminates both the analytical area and the reference area of the filter, and can illuminate multiple portions of the filter at once. This multi-functionality allows a single light source to perform what would traditionally require multiple separate light sources, thereby reducing power consumption while maintaining measurement precision in a compact design.
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
This design enables smaller, lighter, and more portable photometric particle analyzers with improved optical stability and extended operational periods, facilitating automatic and unattended use for monitoring air pollutants like black carbon.
Implementation Method 1
The light guide includes a light guide body, a first branch protruding from the body, and a second branch protruding from the body
Implementation Method 2
detecting the amount of light that passes through the filter using a photo-sensitive detector on the opposite side
Implementation Method 3
collect particles in an air stream by drawing the air through a porous filter which then separates and collects particles in and on the filter structure
Implementation Method 4
If optically absorbing particles are present in the air stream they will accumulate on and in the filter and the optical transmission will change as a portion of the emitted light will be absorbed by these particles
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
An apparatus (12) for receiving an analyte comprises two opposing housings (16, 18) that clamp onto a substrate (14). One of the housings (18) includes passageways that deliver the analyte and optical signals to the substrate (14). Another one of the housings (16) includes passageways that allow optical signals, which have passed through the substrate (14), to travel to photometric sensors (88) which may be used to study the analyte or its effects. The apparatus (12) may include a light guide (74) that uniformly distributes light from a plurality of point emitters to multiple areas of the substrate (14). The apparatus (12) may include an actuator assembly (20) that opens and closes the two housing (16, 18) to allow for installation and removal of the substrate (14). The substrate (14) may be carried in a cartridge (160) that is removable from the two housings (16, 18).