Lens with Custom Incident Surfaces for Uniform Light Distribution
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Solution Overview
Problem
Non-invasive methods for measuring blood glucose levels face challenges in accuracy due to varying optical path lengths when light of different wavelengths is incident at different distances from a photodetector, leading to reduced estimation accuracy.
Innovation Solution
A light source device comprising aligned light sources and a lens with specific waveguides and incident surfaces, ensuring uniform light distribution and minimizing differences in optical path lengths, which is used in conjunction with a photodetector and processor to estimate analyte concentrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple light sources are used to illuminate the measurement area, then the light intensity is improved, but the uniformity of light distribution deteriorates due to varying optical path lengths
Solution Approach 1:
The patent applies local quality by designing different incident surfaces for different light sources based on their specific positions and optical path characteristics. Each light source has a customized incident surface geometry that compensates for its unique optical path length, ensuring that light from all sources achieves uniform distribution at the measurement point despite varying distances and angles.
Solution Approach 2:
The patent employs parameter changes by systematically adjusting the incident surface parameters (such as surface normal vectors, curvature radii, and surface orientations) for each light source. These parameter modifications are calculated to compensate for variations in optical path lengths, allowing multiple light sources to contribute uniformly to the illumination at the measurement area.
2Device complexity
If light sources are positioned at different distances from the photodetector, then the device complexity is reduced, but the measurement precision deteriorates due to varying optical path lengths
Solution Approach 1:
The patent applies local quality by designing different incident surfaces for different light sources based on their specific positions and optical path characteristics. Each light source has a customized incident surface geometry that compensates for its unique optical path length, ensuring that light from all sources achieves uniform distribution at the measurement point despite varying distances and angles.
Solution Approach 2:
The patent employs parameter changes by systematically adjusting the incident surface parameters (such as surface normal vectors, curvature radii, and surface orientations) for each light source. These parameter modifications are calculated to compensate for variations in optical path lengths, allowing multiple light sources to contribute uniformly to the illumination at the measurement area.
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 solution achieves accurate and uniform light distribution, enhancing the accuracy of blood glucose level estimation by minimizing the impact of varying optical path lengths, thereby improving the reliability of non-invasive glucose monitoring.
Implementation Method 1
a lens with a plurality of incident surfaces corresponding to the plurality of light sources, each incident surface having a different curvature radius, the optical axis of each light source passing through a vertex of the corresponding incident surface
Data Source
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AI summary
Provide is a lens which outputs light, emitted by a plurality of light sources, with uniform light distribution. The lens includes a lens body having a first surface which is flat and has an incident hole formed therein, and a second surface which is convex and opposite the first surface; and a plurality of incident surfaces which are recessed from the incident hole toward the second surface, each of the plurality of incident surfaces corresponding to a light source of the plurality of light.