Micro-droplet Fluorescence Detection via Movable Optical Path
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Solution Overview
Problem
Current micro-droplet fluorescence detection methods face challenges in achieving high throughput and sensitivity due to limitations in detection rate, stability, and susceptibility to contamination, with existing systems either being bottlenecked by micro-droplet flow velocity, requiring complex image processing, or being prone to environmental pollution.
Innovation Solution
A micro-droplet fluorescence detection system comprising a microfluidic chip with a channel for single-layer micro-droplet storage, an optical path device for excitation and collection, and a movement control system that allows for relative movement between the chip and optical path, enabling rapid and precise detection while maintaining a closed environment to prevent contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If micro-droplets are separated by sheath flow and sequentially pass through the detection zone, then detection precision and sensitivity are improved, but detection rate is limited to about 3,000 micro-droplets per second
Solution Approach 1:
The invention makes the optical path movable instead of fixed, allowing the detection system to dynamically scan across multiple micro-droplets in parallel. The optical path can move relative to the micro-droplet stream, enabling simultaneous detection of multiple droplets at different positions, thus breaking the sequential detection bottleneck while maintaining detection precision
Solution Approach 2:
The invention transitions from one-dimensional sequential detection (single optical path fixed at one position) to two-dimensional parallel detection by introducing spatial movement of the optical path. Multiple detection zones are accessed along the micro-droplet flow direction, effectively increasing the detection throughput by utilizing the spatial dimension
2Productivity
If fluorescence imaging is used to capture multiple micro-droplets at once, then detection rate is improved, but image processing complexity and computational requirements increase
Solution Approach 1:
The invention extracts and utilizes the natural spatial separation of micro-droplets in the flow stream. Instead of capturing all droplets in a single complex image requiring heavy processing, the system selectively detects individual droplets or small groups at different spatial positions using a movable optical path, reducing the complexity of signal processing while maintaining high detection rates
Solution Approach 2:
The invention replaces the complex computational image processing system with a simpler optical scanning approach. By physically moving the optical path to scan through the micro-droplet stream, the system achieves parallel detection capability without requiring complex algorithms to separate and identify individual droplets from a single large image
3Productivity
If micro-droplets are placed in a rotating cylindrical container for high-speed detection, then detection rate reaches approximately 100,000 micro-droplets per second, but the open detection environment is prone to contamination
Solution Approach 1:
The invention integrates multiple functions into a single microfluidic chip structure: it provides both a closed containment environment to prevent contamination and a controlled flow system to enable high-speed detection. The chip serves as both the reaction vessel and the detection interface, eliminating the need for open container systems while maintaining high detection rates through optimized microfluidic flow and integrated optical scanning
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 system achieves a high detection rate of over 50,000 micro-droplets per second with improved sensitivity and data quality by ensuring uniform fluorescence excitation and reducing background noise, while maintaining a closed environment to prevent cross-contamination.
Implementation Method 1
the fluorescent excitation part causes the micro-droplets containing the fluorescent substance to be fluorescent in an excitation zone
Implementation Method 2
the micro-droplet position detecting part utilizes an oil phase and a water phase of the micro-droplets to be different in light refractive index for realizing determination of the micro-droplet position of the detection zone
Data Source
AI summary
A micro-droplet fluorescence detection system, comprising a microfluidic chip (1), an optical path device, and a movement control device for controlling the chip (1) and an optical path device to move, so that the chip (1) moves relative to the optical path device during a fluorescence scanning detection process of micro-droplets in the chip (1), and the micro-droplets inside the chip (1) remains stationary relative to the chip (1). The micro-droplet fluorescence detection system has advantages of avoiding cross contamination due to closed detection, high detection rate, high throughput and high sensitivity.