Patterned Optical Analyte Sensors for Filter End-of-Service-Life Detection
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Solution Overview
Problem
Current filter systems lack an accurate and reliable method to indicate the end-of-service-life for filter media, particularly in hazardous environments, where exposure to volatile organic compounds poses risks, and existing solutions often rely on visual checks that can be unreliable or ineffective.
Innovation Solution
A filter system incorporating a patterned optical analyte sensor and an optical reader, where the sensor exhibits distinct responses to analytes of interest, allowing for accurate detection and monitoring of analytes like volatile organic compounds, and the optical reader uses multiple light sources and detectors to provide a precise end-of-service-life indication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If visual indicators are used to indicate filter saturation, then the device complexity is reduced, but the measurement precision and reliability of end-of-service-life detection deteriorates
Solution Approach 1:
The patent replaces visual color-change indicators with an optical detection system that uses light sources and detectors to measure optical properties of the filter medium. This substitution of mechanical/visual indicators with optical measurement systems improves detection accuracy while maintaining relatively simple device architecture through standardized optical components.
Solution Approach 2:
The patent utilizes optical property changes (including color changes) of the filter medium in response to analyte accumulation. By measuring these optical property changes with optical detectors, the system achieves precise quantification of filter saturation without requiring complex electronic sensors or complicated measurement systems.
2Measurement precision
If multiple light sources and detectors are used in the optical reader, then the measurement precision and analyte detection capability improve, but the device complexity increases
Solution Approach 1:
The optical reader is divided into multiple functional assemblies, each with dedicated light sources and detectors positioned to interrogate specific regions of the optical analyte sensor. This segmentation allows independent optimization of each detection channel and simplifies the overall system architecture by modularizing the complex optical measurement function.
Solution Approach 2:
Different regions of the optical analyte sensor are assigned different functions - some regions detect specific analytes while others serve as references or control zones. The light sources and detectors are strategically positioned to illuminate and detect from these different regions, enabling multiplexed analysis without requiring a single complex omnidirectional sensor.
3Adaptability or versatility
If patterned optical analyte sensors are used with multiple response regions, then the adaptability and analyte detection range improve, but the manufacturing precision requirements increase
Solution Approach 1:
The optical analyte sensor is divided into multiple distinct regions or zones, each designed to respond to specific analytes or serve specific detection functions. This segmentation can be achieved through standardized fabrication techniques such as photolithography and thin-film deposition, where each region is created as a separate layer or pattern that can be independently optimized for its intended analyte detection.
Solution Approach 2:
The patterned optical sensor structure is designed to perform multiple functions simultaneously - detecting different analytes, providing reference measurements, and enabling quantitative analysis all within a single integrated device. This multi-functionality is achieved through strategic placement of different materials and optical properties in different regions, allowing one sensor to replace multiple specialized sensors.
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 reliable and accurate indication of the filter's end-of-service-life, enhancing safety by ensuring timely replacement and reducing exposure to hazardous substances, while also detecting a wider range of analytes and concentrations.
Implementation Method 1
The optical analyte sensor includes a detection medium and is disposed within the housing such that the detection medium is in fluid communication with the filter medium. The optical reader includes at least one light source and at least one detector.
Implementation Method 2
at least a portion of light emitted by at least one light source of the first assembly is reflected from the first region of the optical analyte sensor and captured by at least one detector of the first assembly
Data Source
Figure 1~2
Figure 3A~3B
Figure 4~5A
AI summary
A filter system includes a housing, a filter medium disposed within the housing, an optical analyte sensor, and an optical reader. The optical analyte sensor is characterized by a first region that exhibit a first response to an analyte of interest and a second region that exhibit a second, different, response to an analyte of interest. The optical analyte sensor includes a detection medium and is disposed within the housing such that the detection medium is in fluid communication with the filter medium. The optical reader includes at least one light source and at least one detector.