Lens-Free CMOS Optical Sensor Flow Channel Evaluation
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Solution Overview
Problem
Existing lens-free CMOS optical sensor package modules lack effective methods for evaluating fluid flow characteristics, which are crucial for ensuring the reliability and safety of fluidic systems in bio-photoreaction and diagnostic instruments.
Innovation Solution
A method that measures the propagation profile and flow velocity of fluids in the initial and normal states within the flow channel, calculates statistical parameters, and compares them to preset reference values to evaluate the flow channel's quality, improving reliability and safety by providing uniformity and stability assessments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fluid flow evaluation is performed without distinguishing between initial state and normal state, then the evaluation process is simple, but the reliability of the evaluation is reduced
Solution Approach 1:
The fluid flow evaluation process is segmented into two distinct phases: initial state flow evaluation and normal state flow evaluation. The initial state evaluation measures propagation profile and flow velocity to assess flow channel quality, while the normal state evaluation measures pixel output values to assess uniformity. This segmentation improves reliability by addressing different aspects of flow characteristics at appropriate times, while the modular structure keeps the complexity manageable.
2Measurement precision
If only single-state flow evaluation is performed, then the measurement process is simple, but the assessment of uniformity and safety is insufficient
Solution Approach 1:
The initial state flow evaluation is performed as a preliminary action before the normal state flow evaluation. By measuring propagation profile and flow velocity in the initial state, the system establishes baseline quality metrics for the flow channel. This preliminary assessment ensures that subsequent normal state measurements are performed on a properly functioning system, improving overall measurement precision without significantly increasing total evaluation time.
3Manufacturing precision
If propagation profile and flow velocity are not measured in initial state, then the setup is simpler, but the quality reference for flow channel is insufficient
Solution Approach 1:
The system uses optical detection methods to measure propagation profile and flow velocity, replacing more complex mechanical measurement systems. The optical sensor array captures light transmission patterns through the fluid, and flow velocity is calculated from these optical measurements. This substitution maintains manufacturing precision for flow channel quality assessment while avoiding the complexity of mechanical measurement apparatus.
Data Source
AI summary
Provided is a method for evaluating fluid flow characteristics of a lens-free complementary metal-oxide semiconductor (CMOS) optical sensor package module with a flow channel. The method includes: measuring a propagation profile and a flow velocity in an initial state flow of a fluid in the flow channel; calculating a first statistical parameter relating to flow characteristics of the fluid from the measured propagation profile and flow velocity; and comparing the calculated first statistical parameter with a preset reference value and evaluating quality of the flow channel according to the comparison result.