Refractometer Light Direction Inversion for Critical Angle Accuracy
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Solution Overview
Problem
Existing refractometers face inaccuracies in measuring the critical angle due to a non-vertical borderline between light and shadow in the optical image, and are not suitable for demanding process conditions as they require a sensitive light source that is difficult to position.
Innovation Solution
A refractometer design where the beam of rays from the light source is directed to the interface between the process liquid and the optical window from the side of the process liquid, allowing for a steeper borderline between light and shadow, simplifying image analysis and enabling operation in challenging conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If light is directed through the optical window to the interface (from the window side), then the measurement avoids interference from liquid color, particles and bubbles, but the borderline between light and shadow becomes non-vertical reducing measurement precision
Solution Approach 1:
The patent inverts the conventional light direction by directing light from the liquid side to the optical window interface instead of from the window side through the liquid. This inversion creates a vertical borderline between light and shadow areas, enabling direct reading of the critical angle without mathematical processing while maintaining immunity to liquid interference.
2Measurement precision
If a sensitive light source is positioned close to the optical window for accurate measurement, then measurement precision improves, but the device complexity and difficulty of positioning increase
Solution Approach 1:
By inverting the light direction to originate from the liquid side, the patent eliminates the need for complex positioning of sensitive light sources near the optical window. The light source can be positioned more freely in the liquid while still achieving accurate critical angle measurement through the vertical borderline it creates.
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 design enhances measurement accuracy by creating a steeper borderline between light and dark areas, simplifying image analysis and allowing the refractometer to function effectively in demanding process conditions, while maintaining the advantages of previous principles.
Implementation Method 1
means for directing a beam of rays from the light source to an interface between the process liquid and the optical window and leading back part of the beam of rays refracted from the interface to the inside of the optical window
Implementation Method 2
measurement of the critical angle of total reflection at the interface between the optical window and the liquid
Data Source
AI summary
A refractometer is disclosed having a light source and an optical window to be positioned in a process liquid. A beam of rays is directed from the light source to an interface (RP) between the process liquid and the optical window and leading back part of the beam of rays refracted from the interface to the inside of the optical window. An image formed in the above manner is observed. The beam of rays from the light source is directed to the interface (RP) between the process liquid and the optical window from the side of the process liquid and in the direction of the interface.