Optical Waveguide Capillary Matrix Potential Sensor
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Solution Overview
Problem
Current methods for measuring matrix potential and vapor pressure in mediums, such as soils, food, and pharmaceuticals, face limitations in accuracy and measurement time, and are not economically efficient.
Innovation Solution
A device utilizing an optical waveguide with a narrow gap that causes a capillary effect, connected to the medium via a semi-permeable membrane, where light intensity changes are measured to determine matrix potential and vapor pressure, using a light source and photodiode to calculate these parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional tensiometers or optical measurement techniques are used to measure matrix potential and vapor pressure, then measurement can be performed, but measurement time is prolonged and accuracy is insufficient
Solution Approach 1:
The patent replaces conventional mechanical tensiometers with an optical measurement system. An optical fiber is inserted into the medium, and light transmission through the fiber is measured to determine matrix potential and vapor pressure. This optical substitution eliminates the need for complex mechanical pressure sensing components, enabling faster and more accurate measurements.
Solution Approach 2:
The patent utilizes changes in light transmission parameters (intensity, attenuation) through the optical fiber as indicators of matrix potential and vapor pressure. By measuring optical parameters rather than direct mechanical pressure, the system achieves both speed and accuracy improvements in the measurement process.
2Measurement precision
If conventional measurement devices are used, then matrix potential and vapor pressure can be measured, but the devices are complex and economically inefficient
Solution Approach 1:
The patent extracts the essential measurement function from complex tensiometer systems and implements it through a simple optical fiber. By removing unnecessary mechanical components and focusing solely on light transmission measurement, the device complexity is dramatically reduced while maintaining measurement capability.
Solution Approach 2:
Replacing mechanical pressure sensing systems with optical measurement systems simplifies the device architecture. The optical fiber-based system requires fewer components, is easier to manufacture, and reduces overall system complexity while providing accurate measurements.
3Measurement precision
If traditional measurement methods are applied, then data can be obtained, but energy consumption is high and maintenance requirements increase
Solution Approach 1:
The optical measurement system consumes significantly less energy compared to mechanical tensiometers that require power-driven pressure sensors, displays, and processing systems. The optical fiber passive measurement approach minimizes energy consumption while maintaining data acquisition capability.
Solution Approach 2:
The optical fiber measurement system is inherently low-maintenance as it has no moving parts, no power requirements for sensing, and no calibration procedures. The system performs self-diagnostic capabilities through the optical signal itself, eliminating maintenance requirements associated with mechanical 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
This solution enhances measurement accuracy and speed while being economically viable, allowing for minimally invasive, low-maintenance, and energy-efficient monitoring of matrix potential and vapor pressure, suitable for remote IoT applications.
Implementation Method 1
an optical waveguide in which a narrow slit is formed, suitable for inducing a capillary effect in liquids
Data Source
Figure 1a~1b
Figure 2a~2b
Figure 3a~3b
AI summary
A device (100) for measuring a matrix potential and/or a vapor pressure in a medium (190) to be investigated is provided. The device (100) comprises an optical waveguide (120) in which a capillary (126) is formed, which can be brought into contact with the medium (190) to be investigated, wherein the capillary (126) has a water level (128) that depends on the matrix potential and/or vapor pressure in the medium (190) to be investigated; a light source (140) for introducing light with an input intensity into the optical waveguide (120) such that the light is transmitted through the capillary (126); and a measuring device (160) for measuring an output intensity of the light at a location in the optical waveguide (120) where the light has transmitted through the capillary (126) at least once. and a computing device to determine the matrix potential and/or vapor pressure in the medium under investigation (190).Furthermore, a chip laboratory (700) and a process (800) are provided in which the device (100) is used.