Harmonic Analysis of Porous Media for Fast Pore Size Measurement
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Solution Overview
Problem
Current methods for measuring pore size distribution in porous media are inefficient, costly, and potentially damaging to samples, with risks of environmental pollution.
Innovation Solution
A device and method utilizing harmonic analysis with a sample and fluid storage container, incorporating pressure sensors and displacement sensors, and employing Newtonian fluid to measure pore sizes through harmonic analysis components, including low-frequency and high-frequency analysis for different pore sizes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If mercury intrusion method is used to measure pore size distribution, then measurement accuracy is improved, but measurement duration becomes too long and sample damage risk increases
Solution Approach 1:
The patent replaces traditional mechanical/chemical intrusion methods with acoustic wave propagation methods. By measuring the attenuation and phase shift of acoustic waves at different frequencies, the system determines pore size distribution without physical intrusion, thereby reducing measurement time and eliminating sample damage while maintaining accuracy
Solution Approach 2:
The patent changes the measurement parameter from pressure-based intrusion to frequency-based acoustic wave analysis. By sweeping through a range of frequencies and analyzing the corresponding attenuation and phase shift characteristics, the system efficiently extracts pore size distribution information in a non-destructive manner
2Measurement precision
If gas adsorption method is used to measure pore size distribution, then measurement accuracy is improved, but instrument cost increases and environmental pollution occurs
Solution Approach 1:
The patent substitutes chemical adsorption processes with physical acoustic wave measurements. The acoustic wave method uses sound propagation characteristics through the porous medium to infer pore structure, eliminating the need for hazardous adsorbate gases and their associated environmental concerns while preserving measurement precision
Solution Approach 2:
The patent employs acoustic waves as an inert, non-polluting probe that interacts with the porous medium without introducing harmful substances. The measurement process occurs in a clean environment using only acoustic energy, thereby eliminating environmental pollution while maintaining accurate pore size distribution measurement
3Productivity
If thermal porosity method is used to measure pore size distribution, then measurement speed is improved, but measurement accuracy deteriorates and sample damage risk increases
Solution Approach 1:
The patent replaces thermal methods with acoustic wave-based measurement. By analyzing frequency-dependent attenuation and phase shift of acoustic waves, the system achieves both rapid measurement and high precision in pore size distribution characterization without the sample damage associated with thermal methods
Solution Approach 2:
The patent employs periodic acoustic wave excitation at multiple frequencies to efficiently extract pore size distribution information. By sweeping through a frequency range and analyzing the periodic response characteristics, the system achieves rapid yet accurate measurements that avoid sample damage
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
Accurately measures pore size distribution safely and efficiently, overcoming the limitations of existing methods by providing a cost-effective and environmentally friendly solution.
Implementation Method 1
The upstream chamber 1 and the downstream chamber 4 are respectively connected with two detection ends of a pressure sensor 34
Implementation Method 2
a displacement sensor, and the displacement sensor and the pressure sensor are respectively connected with two independent transfer function analyzers 44
Implementation Method 3
the displacement sensor and the pressure sensor are respectively connected with two independent transfer function analyzers 44
Data Source
AI summary
Provided are a device and a method for measuring pore size distribution of porous media through a harmonic analysis. The device includes a signal application system, instruments for measuring pressure and displacement, a signal processing instrument and a sample and fluid storage container. According to the disclosure, an oscillating flow is applied to a sample through the signal application system, pressure and displacement signals are collected by the signal processing instrument, a harmonic analysis is performed on the signals, and a frequency response of admittances of the porous media is calculated according to harmonic analysis results of the signals, so that the pore size distribution is obtained.