Triangular Capillary Depth Gauge for High-Contrast Readings
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional capillary depth gauges face challenges in readability due to low contrast between air and water, leading to inaccurate depth measurements, especially when water drops form inside the tube, causing pressure differences and optical effects that hinder precise reading.
Innovation Solution
A capillary depth gauge with an isosceles triangular section and strategically positioned reflection faces, optimized with an angle of 50-55 degrees and a narrowest tube width less than 1.5 mm, ensures even pressure distribution and enhances optical effects for improved readability, featuring multiple capillary tubes for redundancy and enhanced visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional round capillary tube is used, then the structure is simple, but the contrast between air and water is low making reading difficult
Solution Approach 1:
The patent applies asymmetry by changing the capillary tube cross-section from a conventional round shape to an isosceles triangular shape with specific angles (50-55 degrees). This asymmetric geometry creates favorable optical conditions for total internal reflection at the capillary walls when filled with air, significantly enhancing the contrast between the air-filled and water-filled states. The triangular profile with optimized angles ensures that light reflects off the capillary walls at angles that maximize visibility of the air-water interface, directly resolving the low contrast problem while maintaining manufacturing feasibility.
Solution Approach 2:
The patent applies parameter changes by optimizing specific geometric parameters of the triangular capillary tube - the base angles are set between 50-55 degrees and the width at the narrowest point is limited to less than 1.5 mm. These parameter optimizations create the ideal conditions for total internal reflection to occur at the capillary walls when air is present, while preventing excessive capillary pressure that would cause water droplet formation. By carefully controlling these parameters, the patent achieves high contrast readability without the harmful effects of water droplet accumulation.
2Illumination intensity
If the capillary tube width is increased, then the optical effect is enhanced, but water drops form due to capillary pressure differences
Solution Approach 1:
The patent applies parameter changes by establishing an optimal range for the capillary tube dimensions - the base angles are specified as 50-55 degrees and the width at the narrowest point is constrained to less than 1.5 mm. These parameter choices create a balance: the triangular geometry with these specific parameters generates sufficient optical effect through total internal reflection while the limited width prevents excessive capillary pressure that would cause water droplet formation. The parameter optimization ensures both optical performance and reliability.
Solution Approach 2:
The patent converts the potentially harmful capillary pressure effect into a beneficial one. By using a triangular cross-section with specific angles and limited width, the capillary pressure that would normally cause water droplet formation is transformed into a uniform distributing force along the three sides of the triangle. This uniform distribution prevents localized pressure concentrations that lead to droplet formation, while the triangular geometry itself enhances the optical reflection effect. The design turns what could be a harmful pressure concentration into a beneficial uniform pressure distribution.
3Stability of the object's composition
If an equilateral triangular section is used, then pressure is distributed evenly, but the optical effect may be reduced
Solution Approach 1:
The patent applies parameter changes by deviating from the equilateral triangle (60-degree angles) and instead using isosceles triangles with base angles of 50-55 degrees. This parameter modification optimizes both pressure distribution and optical effect. The slightly smaller base angles compared to an equilateral triangle create more favorable conditions for total internal reflection at the capillary walls, enhancing the optical effect. Simultaneously, the triangular geometry maintains even pressure distribution along its three sides, preventing localized stress concentrations. The optimized parameters achieve a superior balance between structural stability and optical performance.
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 triangular configuration and optimized dimensions enhance the optical contrast, providing clear and precise depth readings by distributing pressure evenly and maintaining visibility through total internal reflection, reducing the occurrence of water drops and improving the overall performance of the depth gauge.
Implementation Method 1
When the tube is full of air, under certain angle of incidence conditions, the difference in refractive index between the air and the material of the capillary produces total reflection of light.
Implementation Method 2
water drops are formed in the capillary tube, since the pressure difference due to the capillary effect at the air-water interface is not uniform.
Data Source
Figure 1~2
Figure 3a~3b
Figure 4
AI summary
The gauge (1) has a capillary tube of triangular section that is arranged against a background opposite to an observation surface and visible by transparency from the observation surface. A tubular section is filled with water and a reflection surface is visible by reflection from the observation surface. The capillary tube forms an isosceles triangle whose equal angles having an angular value between 48-60[deg] . The reflection surface is arranged opposite on the sides of isosceles triangle. An independent claim is included for watch.