Optical Detection System Light-Guide Sensitivity
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Solution Overview
Problem
Current point-of-care (POC) testing devices face limitations in transferring the sensitivity of laboratory-based microscopy and spectroscopy to small, low-cost mobile devices due to low light collection efficiency from fluorescent samples, requiring high-power and expensive components like photomultiplier tubes.
Innovation Solution
A high sensitivity optical detection system design featuring a vessel with a light-guide separated from the analytes, excitation and emission filters, and low-cost optical components like LEDs and photodiodes, which enhances light excitation and emission efficiency while isolating noise, allowing for quantitative analysis with low-cost, small-form-factor components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If standard fluorescent detection devices are used, then detection sensitivity can be achieved, but the device size and cost increase significantly
Solution Approach 1:
The patent replaces expensive, complex photomultiplier tubes with inexpensive photodiodes and LEDs. The light-guide structure is designed to be simple and disposable, enabling high-sensitivity detection without requiring costly laboratory-grade components. This allows the system to achieve clinical-grade sensitivity in a low-cost, portable format.
Solution Approach 2:
The patent substitutes complex mechanical optical systems with a streamlined design using light-guides and simple optical components. Instead of complex lens systems and alignment mechanisms, the invention uses total internal reflection in light-guides to direct light, eliminating the need for precise mechanical alignment and reducing overall system complexity.
2Measurement precision
If high power light sources are used to amplify weak signals, then detection sensitivity improves, but device cost and power consumption increase
Solution Approach 1:
The patent converts the typically harmful effect of light scattering and absorption in liquid solutions into a beneficial signal enhancement mechanism. By positioning the light-guide in direct contact with the sample and using total internal reflection, the system captures photons that would otherwise be lost, achieving high signal-to-noise ratios with low-power LED light sources.
Solution Approach 2:
The light-guide acts as an intermediary between the LED light source and the fluorescent analytes. It efficiently couples the excitation light to the sample and collects the emitted fluorescence, maximizing the utility of each photon and enabling sensitive detection with minimal power consumption from the LED source.
3Measurement precision
If sophisticated optical systems from laboratory are transferred to mobile devices, then detection sensitivity can be maintained, but device size and complexity increase
Solution Approach 1:
The patent transitions from three-dimensional complex optical paths to a two-dimensional planar light-guide structure. The light-guide provides a defined optical path within the plane of the device, eliminating the need for complex three-dimensional lens systems and alignment mechanisms, thereby reducing device volume while maintaining sensitivity.
Solution Approach 2:
The optical system is segmented into distinct functional zones: excitation light delivery through the light-guide, sample interaction zone, and emission collection path. This segmentation allows each component to be optimized independently and packaged in a compact arrangement, reducing overall device size while maintaining performance.
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 achieves a high signal-to-noise ratio and sensitivity comparable to commercial fluorometers and ELISA plate readers, enabling clinical-level diagnosis in an inexpensive mobile POC format, potentially broadening POC adoption for various disease detections.
Implementation Method 1
The high sensitivity comes from the effective light excitation of the materials, the highly efficient emission guided to the detector by the light-guide
Implementation Method 2
one or more excitation filters between the excitation light sources and the vessel, one or more emission filters between the vessel and the detector
Implementation Method 3
Fluorescent labeling is widely used for biochemical analysis and disease diagnosis
Data Source
AI summary
A high sensitivity optical system for detection of chemical and biological analytes is disclosed comprising a vessel containing the chemical and biological analytes, a light-guide inside the vessel but separated from the vessel by the chemical and biological analytes, one or more excitation light sources at one end of the vessel, a detector at another end of the vessel, one or more excitation filters between the excitation light sources and the vessel, one or more emission filters between the vessel and the detector, and light directing components. The novel optical system is secured in a housing and connected to devices extrinsically or intrinsically for data input, process, display, storage, and communication. This optical system could enable clinical level diagnosis of a wide range of diseases in an inexpensive mobile point-of-care format. Furthermore, the form factor of the optical system can be significantly reduced to form a highly integrated lab-on-a-chip system.