Optical Sensing Module With Segmented Filter Layer
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Solution Overview
Problem
Conventional fluorescence detection systems face sensitivity issues due to the filter layer, which filters both the exciting beam and the fluorescence, affecting the signal-noise ratio (SNR) and sensitivity of the sensing results.
Innovation Solution
An optical sensing module is designed with a light source, light guide plate, first cladding layer, light converging layer, and sensors, where the light converging layer provides a converging function and the filter layer offers a filtering function, while the noise-reduction layer includes filter elements and light shielding elements to enhance sensitivity and SNR, and prevent crosstalk between sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a filter layer is added to filter the exciting beam, then the exciting beam is prevented from affecting sensing results, but a portion of fluorescence is also filtered and sensitivity is reduced
Solution Approach 1:
The filter layer is divided into multiple regions with different filtering characteristics. Each region filters specific wavelength ranges differently, allowing the exciting beam to be blocked while minimizing filtering of the fluorescence signal. This segmented approach enables selective filtering that maintains sensitivity while ensuring reliable sensing results.
2Reliability
If the filter layer filters the exciting beam, then the sensing results are protected from interference, but the signal-noise ratio is affected
Solution Approach 1:
Different regions of the filter layer have different optical properties tailored to local requirements. Regions closer to the exciting beam source have stronger filtering characteristics, while regions in the fluorescence detection path have more transparent characteristics. This local quality variation protects against exciting beam interference while preserving the fluorescence signal and maintaining signal-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 optical sensing module achieves high sensitivity and SNR with a small thickness, effectively filtering the exciting beam and shielding unwanted light, thereby improving the accuracy and efficiency of light transmission and reducing crosstalk.
Implementation Method 1
After the exciting beam enters the light guide plate, at least one portion of the exciting beam is transmitted to the sample through the portion of the surface of the light guide plate exposed by the holes
Implementation Method 2
The sample is excited by the exciting beam to emit a fluorescent light
Implementation Method 3
the light converging layer provides a converging function
Implementation Method 4
a filter layer is additionally disposed in the fluorescence detection system in order to filter a portion of the exciting beam
Implementation Method 5
The fluorescent light from the sample is transmitted to a light sensor, and the light sensor converts the fluorescent light into electrical signals
Data Source
AI summary
An optical sensing module is configured to detect a characteristic of a sample. The optical sensing module includes a light source, a light guide plate, a first cladding layer, a light converging layer, a filter layer, and a plurality of sensors. The light source is configured to provide an exciting beam. Positions of the sensors correspond to positions of the holes. After the exciting beam enters the light guide plate, at least one portion of the exciting beam is transmitted to the sample through a portion of the surface of the light guide plate exposed by the holes, the sample is excited by the exciting beam to emit a signal beam, and the signal beam passes through the light converging layer and the filter layer in an order and travels to the sensors. Another optical sensing module is also provided.