Mirrored Cavity Fluorescence Sensor for Uniform Excitation
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Solution Overview
Problem
Conventional sensors for environmental monitoring, particularly for pH, pCO2, and pO2 levels, face challenges such as high costs, calibration requirements, and reduced sensitivity due to inefficient light distribution and scattering issues, which hinder effective monitoring of pollution and global warming effects in aquatic environments.
Innovation Solution
The development of fluorescence-based sensors with mirrored cavities and reflective surfaces to enhance light uniformity and reduce scattered light, allowing for sensitive, low-cost, and calibration-free measurements of pH, pCO2, and pO2 levels, utilizing a fluorescence-based sensing medium within a recessed cavity with reflective sides and a transparent bottom for improved excitation and emission light management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional sensors are used for environmental monitoring, then they can measure pH, pCO2, and pO2 levels, but they suffer from reduced sensitivity due to inefficient light distribution and scattering issues
Solution Approach 1:
The patent employs a curved reflective surface (mirror) within the sensor cavity to redirect excitation light. This curvature enables the light to uniformly illuminate the fluorescence sensing medium from multiple angles, transforming inefficient direct illumination into distributed uniform lighting, thereby enhancing measurement sensitivity without adding complex optical components
Solution Approach 2:
The invention introduces a spatial dimension by incorporating a three-dimensional reflective cavity structure. The mirror creates multiple light paths through reflection, effectively adding dimensional complexity to the light distribution pattern, which improves uniformity across the sensing medium while maintaining a relatively simple overall device structure
2Measurement precision
If conventional sensors are used for environmental monitoring, then they can detect environmental parameters, but they require frequent calibration which increases operational complexity
Solution Approach 1:
The sensor incorporates a built-in reference fluorescence standard within the sensing medium that does not require external calibration. This self-reference mechanism allows the sensor to automatically compensate for drift and maintain accurate measurements over time, eliminating the need for frequent manual calibration operations while preserving measurement precision
Solution Approach 2:
The patent implements an internal feedback mechanism where the ratio of sample fluorescence intensity to reference fluorescence intensity is measured. This ratiometric approach provides self-correcting feedback that compensates for variations in excitation light intensity and detector sensitivity, maintaining measurement accuracy without requiring external calibration inputs
3Measurement precision
If conventional sensors are used for environmental monitoring, then they can monitor pollution levels, but they have high costs that hinder widespread deployment
Solution Approach 1:
The patent employs a disposable sensor design where the fluorescence sensing medium is contained in a single-use cartridge or integrated into an inexpensive substrate. This approach allows low-cost manufacturing of individual sensor units that can be deployed widely, with each unit maintaining high detection precision during its service life before being replaced rather than recalibrated or repaired
Solution Approach 2:
The invention separates the expensive optical detection components from the sensing medium, allowing the sensing portion to be manufactured cheaply and disposed of, while the expensive detector and light source are reused across multiple sensor units. This extraction of the costly elements enables widespread deployment of precision sensors at low per-unit cost
4Measurement precision
If conventional sensors are used for environmental monitoring, then they can measure environmental parameters, but they produce scattered light that reduces measurement precision
Solution Approach 1:
The patent converts the potentially harmful scattered light into a beneficial effect by using a reflective mirror to redirect it. The scattered excitation light that would normally be lost is instead reflected onto the sensing medium, enhancing fluorescence excitation uniformity. The measurement geometry is designed so that scattered excitation light does not reach the detector, transforming what would be noise into useful signal while maintaining high signal-to-noise ratio
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 approach enables the creation of small, low-cost, and highly sensitive sensors capable of monitoring ocean acidification and other environmental parameters with increased precision and reduced noise, facilitating widespread deployment for real-time data collection and minimizing the impact of temperature fluctuations and biofouling.
Implementation Method 1
a reflective surface adjacent to the at least one side surface of the fluorescence based sensing medium, wherein the reflective surface is positioned to reflect excitation light that enters the fluorescence based sensing medium through the at least one side surface
Implementation Method 2
a detector positioned to detect fluorescence emissions that exit through one of either the bottom or top surface of the fluorescence based sensing medium
Data Source
AI summary
A fluorescence based sensor system that provides improved signal-to-noise over prior systems is provided. The system includes a fluorescence based sensing medium that is contained a recessed cavity with reflective sides that allow for more uniform excitation of the fluorescence based sensing medium by the excitation light.