Low Angle Sensitive Optical Filter for Analyte Sensor Accuracy
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Solution Overview
Problem
Existing optical filtering systems in analyte sensors are sensitive to high angles of incidence, leading to reduced accuracy due to the transmission of unwanted light, which degrades the sensor's ability to accurately detect analytes in a living animal.
Innovation Solution
The implementation of low angle sensitive (LAS) optical filters that reduce transmission efficiency as the angle of incidence increases, preventing light outside the band pass region from reaching the photodetector while allowing light within the band pass region to pass through, thereby enhancing the sensor's accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional optical filters are used in the sensor, then the sensor can detect analytes, but the sensor becomes sensitive to high angle of incidence light which reduces measurement accuracy
Solution Approach 1:
The patent modifies the optical filter's transmission characteristics by changing its design parameters to create a low angle sensitive (LAS) filter. This filter maintains high transmission for normal incidence light while blocking high angle of incidence light, thereby resolving the contradiction between analyte detection capability and sensitivity to oblique light
Solution Approach 2:
The patent applies different angular sensitivity characteristics to different parts of the optical filter's function. The LAS filter is designed to have angle-dependent transmission properties where it selectively transmits light based on its angle of incidence, allowing desired analyte signal detection while rejecting unwanted oblique light
2Use of energy by moving object
If the optical filter allows all wavelengths to pass through, then more light reaches the photodetector, but unwanted wavelengths increase noise and reduce signal-to-noise ratio
Solution Approach 1:
The optical filter spectrum is segmented into desired and undesired wavelength regions. The LAS filter is designed to transmit specific wavelength bands corresponding to analyte signals while blocking other wavelengths that would contribute to noise, achieving both efficient light utilization and 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
The LAS optical filters significantly improve the sensor's accuracy by minimizing the impact of high angle incidence light, ensuring that only intended wavelengths reach the photodetector, resulting in a higher signal-to-noise ratio and more precise analyte detection.
Implementation Method 1
The LAS optical filter may be configured to prevent light having a wavelength outside a band pass region from reaching the photodetector and to pass light having a wavelength within the band pass region to the photodetector
Implementation Method 2
The percentage of light passing through the LAS optical filter may decrease as the angle of incidence of the light increases
Implementation Method 3
The photodetector may be configured to convert received light into current indicative of the intensity of the received light
Data Source
AI summary
Apparatuses and methods for improving the accuracy of an analyte sensor are disclosed. The sensor may include a photodetector and a low angle sensitive (LAS) optical filter. The photodetector may be configured to convert received light into current indicative of the intensity of the received light. The LAS optical filter may be configured to prevent light having a wavelength outside a band pass region from reaching the photodetector and to pass light having a wavelength within the band pass region to the photodetector. The percentage of light passing through the LAS optical filter may decrease as the angle of incidence of the light increases.