Optical Flow Detection in Groundwater via Pre-Scattering
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Solution Overview
Problem
Current methods for detecting groundwater flow movements are limited by indirect measurements that lack precision and resolution, especially in non-correlatable water levels, extensive networks, or shallow gradients, and direct methods are restricted by high variance and limited data, requiring artificial tracers which are uneconomical.
Innovation Solution
The method employs optical detection using pre-light scattering, where a light beam penetrates the measurement area but is directed past the optical path, allowing scattered light to be guided to a camera for image evaluation, enabling the determination of flow velocity and direction without artificial markers, suitable for a wide range of velocities from 10^-8 m/s to 10^-3 m/s.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If indirect measurement methods using well gauges are used to determine groundwater flow direction and velocity, then the measurement can be performed over large areas, but the measurement precision and resolution are insufficient, particularly in cases of non-correlable water table levels, widely spaced gauge networks, insufficient number of gauges, or shallow groundwater gradients
Solution Approach 1:
The patent replaces the mechanical well gauge measurement system with an optical measurement system. The optical device uses light scattering by suspended particles to directly measure flow velocity and direction, eliminating the need for complex gauge networks and water table correlation calculations. This substitution of measurement physics enables high-precision local flow measurements without the infrastructure complexity of traditional indirect methods.
2Measurement precision
If direct flow motion measurements are performed at individual well gauges, then the measurement provides detailed local flow information, but the method is limited to single measurements with high variance and cannot record flow behavior changes online
Solution Approach 1:
The patent implements continuous online measurement capability through the optical device that can continuously track particle movement in the groundwater flow. The system records flow behavior changes over time, providing a time series of velocity and direction data. This continuous measurement approach eliminates the single-point measurement limitation and enables statistical evaluation of flow patterns.
Solution Approach 2:
The patent uses naturally occurring suspended particles in groundwater as flow tracers, copying the function of artificial tracers without requiring their introduction. These particles are illuminated and optically detected to represent flow motion, providing continuous measurement data without the costs and regulatory requirements of artificial tracer methods.
3Reliability
If artificial tracers are introduced for measuring groundwater flow, then the flow can be tracked and measured, but the setup and measurement time are high and the method is uneconomical
Solution Approach 1:
The patent employs naturally occurring suspended particles in groundwater as flow indicators, allowing the groundwater itself to provide the measurement tracers. This self-service approach eliminates the need for external tracer introduction, reducing setup time and costs while maintaining measurement reliability. The method leverages existing particles that are already present in the groundwater.
Solution Approach 2:
The optical measurement device is designed to work with any suspended particles naturally present in groundwater, making the method universally applicable without requiring specific tracer materials. The system can measure flow in various groundwater conditions using the same basic approach, eliminating the need for method adjustments or additional equipment for different flow scenarios.
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 approach provides continuous, high-resolution monitoring of groundwater flow movements with reduced measurement errors, eliminating the need for artificial tracers and on-site calibration, and is economically viable, offering improved data validity and flow geometry reconstruction.
Implementation Method 1
The invention utilizes the pre-light scattering of particles under investigation to examine their motion profile (speed, possibly change in speed and flow direction, and possibly change in flow direction)
Data Source
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AI summary
The invention relates to a method and the apparatus for optically detecting flow movements in liquid and/or gaseous media. According to said method, a measuring volume (36) is defined in a medium and at least one measuring plane (32) is defined within the measuring volume (36), particles which move in the extent of the measuring plane (32) being optically detected. The measuring plane (32) is lighted and trans-illuminated from one side of the measuring plane (32), that is to say from an illumination side, in at least one detection area (34) by means of a beam (42) of parallel light rays emitted by an illumination unit (38), and scattered light (56) is produced by particles inside the detection area (34) of the measuring plane (32). Scattered light (56), which is emitted on a pre-scattering side opposite the illumination side, or at least a part of said light is passed, in the form of pre-scattered light, to an image recording plane (66) of a camera (68) by at least one optical light-guiding element (26). A sequence of images of the detection area (34) is recorded by the camera (68). A motion vector with respect to at least one particle is determined by means of image evaluation using the image sequence.