Multi-Wavelength Light Sensor Layout for Low-Noise Intensity Detection
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Solution Overview
Problem
Existing light detection sensors face challenges in accurately detecting light intensity across different wavelength bands due to varying sensitivity of light receiving elements, leading to noise amplification and inaccurate readings, especially for low emission intensity light.
Innovation Solution
A light detection sensor with multiple detectors, each sensitive to different wavelength bands, and a controller to measure light intensity during extinction, using a light guide body to distribute light uniformly and adjust detector areas based on sensitivity to correct output variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If gain adjustment is applied to pixels with low sensitivity to equalize detection intensity, then detection intensity uniformity is improved, but noise is amplified
Solution Approach 1:
The patent applies local quality by assigning different light receiving areas to different pixels based on their sensitivity characteristics. Pixels with lower sensitivity are given larger light receiving areas, while pixels with higher sensitivity have smaller areas. This local differentiation compensates for sensitivity variations without requiring gain adjustment, thereby avoiding noise amplification while achieving uniform detection intensity across all pixels.
2Measurement precision
If light receiving area is increased for detectors with low sensitivity, then detection accuracy is improved, but detector uniformity is reduced
Solution Approach 1:
The patent deliberately introduces local quality variations in the light receiving areas of different detectors. Each detector is designed with a specific light receiving area tailored to its sensitivity characteristics, creating a non-uniform structure that achieves uniform detection performance. This resolves the contradiction by making the physical structure non-uniform to compensate for sensitivity differences, thereby achieving overall detection uniformity.
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 sensor effectively corrects output variations and suppresses noise, enabling accurate light intensity detection across varying wavelengths.
Implementation Method 1
a light receiver comprising a plurality of detectors for detecting the intensity of light from the detection object
Data Source
AI summary
A light detection sensor 10 comprises a light source 12 for radiating light to a detection object T and a light receiver 11 comprising a plurality of detectors for detecting intensity of light from the detection object T. The plurality of detectors comprises at least, a first detector 11a for detecting intensity of light of a first wavelength band, and a second detector 11b for detecting intensity of light of a second wavelength band different from the first wavelength band. Sensitivity of the first detector 11a to the light of the first wavelength band is lower than sensitivity of the second detector 11b to the light of the second wavelength band. A light receiving area of the first detector 11a is larger than a light receiving area of the second detector 11b.