Transmitted Light Intensity Measurement Unit for Fluid Concentration
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Solution Overview
Problem
Conventional fluid concentration measuring devices face difficulties in obtaining sufficient transmitted light due to scattering and attenuation between the light source and the light receiving element, resulting in reduced measuring accuracy.
Innovation Solution
A transmitted light intensity measurement unit is designed with a light-transmissive member, such as a ball lens, that closely contacts the duct wall, eliminating air layers and surface irregularities, ensuring efficient light transmission between the light source and the light receiving element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If light is supplied from the light source through the duct wall to the light receiving element, then fluid concentration can be measured based on the Beer-Lambert law, but light attenuates due to scattering between the light supply part and the light source and/or between the light receiving part and the light receiving element, resulting in insufficient light quantity reaching the light receiving element
Solution Approach 1:
A light-transmissive member is introduced as an intermediary component between the light source and the duct wall, and between the light receiving element and the duct wall. This member serves as a mediator to improve light transmission efficiency by closely contacting the duct wall through elastic deformation, thereby reducing the air layer and minimizing light scattering and attenuation.
Solution Approach 2:
The light-transmissive member changes the physical parameters of the light path by eliminating air gaps and reducing surface irregularities through elastic deformation. This parameter change in the medium between the light source/receiving element and the duct wall reduces light scattering and improves transmission efficiency.
2Loss of energy
If a light-transmissive member is introduced to reduce light attenuation, then more light reaches the light receiving element, but the device structure becomes more complex
Solution Approach 1:
The light-transmissive member is designed as a flexible component that can elastically deform to closely contact the duct wall. This flexible design allows the member to adapt to the duct's shape and movement while maintaining optimal light transmission, reducing the need for complex rigid mounting structures.
Solution Approach 2:
The light-transmissive member utilizes its own elastic deformation capability to automatically adjust and maintain close contact with the duct wall. This self-adjusting mechanism eliminates the need for additional complex positioning or fastening structures, allowing the component to serve itself in maintaining optimal light transmission conditions.
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
This configuration significantly reduces light attenuation, allowing for an adequate amount of light to reach the light receiving element, thereby enhancing the measuring accuracy of fluid concentration.
Implementation Method 1
a light-transmissive member disposed on at least one light path among a light pass between the light source and the light supply part and a light pass between the light receiving element and the light receiving part
Implementation Method 2
the light attenuates due to scattering etc. between the light supply part on the surface of the duct and the light source and/or between the light receiving part on the surface of the duct and the light receiving element
Implementation Method 3
a fluid concentration measuring device which measures a concentration of a fluid flowing through a duct having a light-transmissive and deformable duct wall based on the Beer-Lambert law
Data Source
AI summary
A transmitted light intensity measurement unit for measuring a concentration of fluid flowing through a duct comprises: a light source for supplying light into the duct from a light supply part on a surface of the duct; a light receiving element for receiving the light, which has been passed from the light supply part through the duct wall and the fluid inside the duct, at a light receiving part located on an opposite side in a diametrical direction of the duct relative to the light supply part, and outputs a signal indicating an intensity of the light; and a light-transmissive member disposed on at least one light path among a light pass between the light source and the light supply part and a light pass between the light receiving element and the light receiving part, abutting and closely contacting the duct wall by an elastic deformation of the duct wall.