In-Liquid Particle Detection with Stray Light Suppression
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Solution Overview
Problem
Existing in-liquid fine particle detection devices face challenges in real-time measurement due to the absence of an outlet port in vials, leading to reduced commercialization and increased costs, and suffer from decreased detection precision due to stray light reflection from internal surfaces.
Innovation Solution
The device incorporates a flow channel with an optical shielding, a light source, a stray light prevention structure, and a scattering detector, where the stray light prevention structure is designed to absorb or reflect light emitted by the light source, preventing stray light and enhancing detection precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a vial without an outlet port is used for light scattering measurement, then the device structure is simplified, but real-time measurement capability is lost
Solution Approach 1:
The measurement system is segmented into multiple functional components: a flow channel for liquid passage, an optical shielding for light control, a light source for illumination, a stray light prevention structure for noise reduction, and a scattering detector for measurement. This segmentation enables real-time measurement while maintaining structural efficiency.
Solution Approach 2:
A flow channel is introduced as an intermediary component between the liquid sample and the optical system. This flow channel enables continuous liquid flow through the measurement zone, providing real-time measurement capability while maintaining a compact device structure suitable for home appliances.
2Measurement precision
If light is directed onto the lower end portion of the vial with the detector on the lateral portion, then scattered light detection is achieved, but product commercialization costs increase and assimilability decreases
Solution Approach 1:
The optical shielding structure serves multiple functions simultaneously: it directs light onto the flow channel, blocks external light from interfering with measurements, and provides structural support. This multi-functionality reduces the number of separate components needed, lowering manufacturing costs and improving ease of production while maintaining effective scattered light detection.
3Measurement precision
If the detector is arranged on the lateral portion of the vial, then scattered light can be detected, but stray light from internal surface reflection increases
Solution Approach 1:
The stray light prevention structure is designed to intercept and redirect stray light that would otherwise reach the detector. By converting the harmful stray light into a controlled optical path or absorbing it, the structure maintains the lateral detector configuration for scattered light detection while eliminating the harmful interference, thereby improving measurement precision without increasing costs.
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
Enables real-time measurement of fine particles with high detection precision by effectively suppressing stray light, allowing for compact, cost-effective, and efficient operation in home appliances.
Implementation Method 1
an optical shielding surrounding the flow channel and configured to block external light
Implementation Method 2
a light source arranged on one side of the optical shielding and configured to emit light into the inside of the optical shielding
Implementation Method 3
a stray light prevention structure arranged on the opposite side of the optical shielding and configured to remove light emitted by the light source and propagating through the flow channel
Implementation Method 4
the wall surface of the stray light prevention structure can include a first wall surface formed at a first angle with respect to the inlet end, thereby absorbing or reflecting light
Implementation Method 5
a scattering detector arranged between the light source and the stray light prevention structure and configured to detect scattered light, resulting from the emitted light reacting with fine particles
Data Source
AI summary
An in-liquid fine particle detection device including a flow channel through which a solution flows; an optical shielding surrounding the flow channel; a light source arranged on a light input side of the optical shielding and configured to emit light into an inside of the optical shielding surrounding the flow channel; a stray light prevention structure arranged on a light output side of the optical shielding and configured to remove light emitted by the light source and propagated through the flow channel; and a scattering detector arranged between the light source and the stray light prevention structure and configured to detect scattered light, resulting from the emitted light scattered by fine particles included in the solution flowing in the flow channel.