Surface Acoustic Wave Sensor With Multi-Resonance Measurement
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Solution Overview
Problem
Conventional surface acoustic wave-based material measurement sensors are limited by single resonance frequency, leading to restricted measurement of inherent physical properties and reduced sensing reliability due to temperature and humidity sensitivity, especially with water-containing particles.
Innovation Solution
A particle material measuring device with multiple pairs of comb-shaped electrodes and temperature control units (heating and cooling) to generate surface acoustic waves with multiple resonance frequencies, allowing precise measurement of physical properties like size, mass, and shape, while maintaining consistent temperature and moisture-free conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional material measurement sensor uses only one resonance frequency, then the device structure remains simple, but the measurement of inherent physical properties of materials is limited
Solution Approach 1:
The sensor is divided into multiple electrode modules (first electrode module, second electrode module, third electrode module, etc.), where each module contains comb electrodes with different gap widths. This segmentation allows each module to generate surface acoustic waves at different resonance frequencies, enabling multi-frequency measurement capability while maintaining a modular and manageable device structure
Solution Approach 2:
The sensor structure is designed to perform multiple functions simultaneously: it can measure different inherent physical properties of materials (density, stiffness, elasticity, viscosity) at different resonance frequencies using the same piezoelectric substrate and electrode configuration, making the device universally applicable for comprehensive material characterization
2Measurement precision
If temperature changes occur in the measurement environment, then the physical property values of chemical materials change, but measurement reliability is degraded
Solution Approach 1:
The sensor utilizes changes in resonance frequencies at different temperatures to compensate for temperature effects. By measuring at multiple resonance frequencies and analyzing the frequency shifts, the system can distinguish between temperature-induced frequency changes and those caused by material property changes, thereby maintaining measurement accuracy across varying temperatures
Solution Approach 2:
The system employs feedback mechanisms where the measured frequency data from multiple electrode modules is processed to detect temperature variations. This information is then used to compensate for temperature effects on material measurements, ensuring reliable sensing results even in temperature-varying environments
3Measurement precision
If particles containing water contact the piezoelectric substrate surface, then surface acoustic wave attenuation occurs, but sensing reliability decreases
Solution Approach 1:
The sensor uses surface acoustic waves (mechanical vibrations) that propagate along the piezoelectric substrate surface. By operating at multiple resonance frequencies, the system can detect material properties through vibrational characteristics while being less susceptible to attenuation from water-containing particles, as different frequencies interact differently with the particles
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
Accurate and reliable measurement of various physical properties by generating multi-resonant waves, enhancing sensing reliability and precision, especially for temperature-dependent materials.
Implementation Method 1
the piezoelectric substrate is formed of a piezoelectric material that is excited by the first to n-th electrode modules to generate a surface acoustic wave
Implementation Method 2
generate a surface acoustic wave (where n is a natural number greater than 1)
Implementation Method 3
when an AC signal is applied to a pair of crossed comb-shaped electrodes, an electric field is formed by a piezoelectric material between another pair of comb-shaped electrodes
Data Source
AI summary
The present invention relates to a surface acoustic wave-based material measuring device, material measuring system, and material measuring method, and more particularly, to a technique of accurately and reliably measuring various inherent physical properties of temperature and frequency-dependent materials by generating multiple resonant waves.