Air-Coupled Water Level Meter for Slender Tubes
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional methods for measuring the depth to a water table are ineffective in slender tubes due to adhesion issues and require large diameters or electrical connections, which are not feasible in all scenarios, especially in deep or angled wells.
Innovation Solution
An air-coupled water level meter system that injects a measured quantity of gas into a sealed tube, using pressure transducers to calculate the depth by measuring pressure changes, allowing for accurate water level determination in slender tubes without the need for traditional measurement devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional measurement devices are used in slender tubes, then measurement can be performed, but the tube diameter must be sufficiently large to accept the device
Solution Approach 1:
The patent replaces mechanical measurement devices (electrical water level meters, tapes, cables) with a pneumatic system that uses gas injection and pressure sensing. The air-coupled transducer system measures water level by detecting pressure changes in an air column rather than using physical contact methods, enabling measurement in tubes too slender for traditional devices.
Solution Approach 2:
The invention uses a pneumatic approach by injecting a measured quantity of gas into the sealed tube and measuring pressure changes with a transducer. This pneumatic system allows water level measurement in slender tubes by utilizing gas pressure rather than mechanical contact, resolving the contradiction between measurement capability and tube diameter constraints.
2Measurement precision
If cable or tape is lowered into deep wells, then water level can be measured, but adhesion to the wall produces strong bond preventing withdrawal
Solution Approach 1:
The patent eliminates the mechanical cable/tape system that suffers from adhesion forces by replacing it with a pneumatic measurement system. The air-coupled transducer measures water level through pressure detection in a sealed air column, completely avoiding the adhesion problem that prevents cable withdrawal from deep or angled wells.
Solution Approach 2:
The invention introduces a sealed air column as an intermediary medium between the measurement system and the water level. By measuring pressure changes in this air column rather than using direct mechanical contact with water or cables, the system avoids adhesion forces while still accurately determining water level depth.
3Ease of operation
If electrical water level meter is used, then measurement is straightforward, but the method requires access large enough to accept the device
Solution Approach 1:
The patent replaces electrical measurement devices with a pneumatic system that uses gas injection and pressure sensing. This substitution maintains ease of operation through automated pressure measurement while dramatically reducing the required tube diameter, as the pneumatic system can function in much slenderer tubes than electrical meters.
Solution Approach 2:
The invention changes the fundamental measurement parameter from electrical contact detection to pneumatic pressure detection. By measuring pressure changes in a sealed air column rather than detecting electrical contact with water, the system achieves both ease of operation and compatibility with slender tube diameters.
4Measurement precision
If pressure transducer is lowered to beneath water table, then water level can be measured, but the transducers are relatively expensive
Solution Approach 1:
The patent performs preliminary action by sealing a known volume of air above the water level before measurement. By pre-establishing this sealed air column and knowing its initial volume, the system can measure water level changes through pressure changes without requiring expensive in-situ transducers at the water table depth.
Solution Approach 2:
The invention uses a sealed air column as an intermediary that transmits pressure information from the water level to a transducer located at the surface. This intermediary approach allows the use of less expensive surface-mounted transducers rather than requiring expensive deep-bore transducers to be lowered to beneath the water table.
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 precise measurement of water table depth in tubes with diameters as small as 0.25 inches, overcoming adhesion and access limitations, and is suitable for both shallow and deep water tables, including those where electrical methods fail.
Implementation Method 1
using pressure transducers to calculate the depth by measuring pressure changes
Implementation Method 2
injection of a measured quantity of gas (air) into a sealed volume, while recording the pressure change in that volume
Data Source
AI summary
A method and system for determining the depth to a water level, particularly depth to a ground water table below Earth's surface. The method can be used to measure the depth to a water table when the only access to the aquifer is a slender tube. A measured quantity of gas is injected into a sealed volume, while recording the pressure change in that volume, allowing a deduction of the size of the sealed volume. Using measurements of the sealed volume and the dimension of the tube containing that volume, the depth to the water level can be calculated.