Combined Capillary Depth Gauge for Linear Scale
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Solution Overview
Problem
Capillary depth gauges, commonly used for diving, suffer from significant nonlinearity in their scales, particularly in deeper waters, limiting their accuracy.
Innovation Solution
A combined device with multiple capillary tubes, each designed for specific depth ranges, featuring two or three chambers to enhance measurement accuracy and linearity, allowing for more precise depth readings across a broader range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single capillary tube is used in a wristwatch-like device, then the device size is limited, but the measurement range and linearity are compromised
Solution Approach 1:
The single capillary tube is divided into multiple separate capillary tubes, each optimized for specific depth ranges. This segmentation allows each tube to maintain appropriate length for its measurement range while the combined system provides extended overall measurement capability with improved linearity across all ranges.
Solution Approach 2:
The patent transitions from a single-dimensional measurement approach (one tube) to a multi-dimensional approach by combining multiple tubes with different characteristics. Each tube operates in its optimal range, and their combined readings provide comprehensive depth measurement with improved precision across the full range.
2Measurement precision
If the capillary tube length is increased to extend measurement range, then deeper depths can be measured, but the scale becomes significantly nonlinear
Solution Approach 1:
The measurement function is segmented across multiple capillary tubes, each optimized for specific depth intervals. The first tube handles 0-30m with 90mm scale length, while subsequent tubes handle deeper ranges. This segmentation maintains scale linearity within each tube's optimal range while extending the overall measurement capability.
Solution Approach 2:
Each capillary tube is designed with local optimization for its specific depth range. The tubes have different lengths and chamber configurations suited to their respective measurement intervals, ensuring that each local segment operates with optimal linearity and precision for its intended purpose.
3Measurement precision
If multiple capillary tubes are combined in one housing, then measurement linearity and accuracy are improved, but the device complexity increases
Solution Approach 1:
Multiple capillary tubes with different functions are merged into a single integrated housing. The first tube with two chambers (measuring and absorbing) and subsequent tubes with three chambers (one measuring, two absorbing) work together as a unified system, sharing common housing and scale structures to reduce overall complexity.
Solution Approach 2:
The housing and scale structures serve multiple functions simultaneously, accommodating different tube configurations and providing unified reading mechanisms. The absorbing chambers in each tube serve dual purposes of pressure regulation and measurement reference, reducing the need for separate components.
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 solution provides a more accurate and linear measuring scale, enabling confident depth readings with improved precision up to 60 meters, compared to traditional single-tube gauges.
Implementation Method 1
The compression of the air space within the tube follows the general gas law: P1*V1/T1=P2*V2/T2
Implementation Method 2
Capillary depth gauges are well known. Capillary Depth Gauge (also known as a bubble depth gauge) is the simplest instrument designed for diving to measure the depth
Data Source
AI summary
Combining several capillary tubes in one depth gauge, which measure the depth in different ranges, will allow obtaining a measuring scale close to linear and eliminate the main disadvantage of a capillary depth gauge.