Quartz Oscillator Frequency Analysis for Load Separation
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Solution Overview
Problem
Conventional QCM methods fail to measure mass load, viscous load, and viscoelasticity separately due to their effects on resonance frequency, making it difficult to accurately determine the properties of substances interacting with a quartz oscillator.
Innovation Solution
The method involves using specific formulas to differentiate between mass load, viscous load, and viscoelasticity by analyzing changes in resonance frequency across different overtone modes, specifically using the fundamental and third overtone frequencies to separate these loads, and applying models like the Voight model for viscoelasticity analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If resonance frequency measurement is used to determine substance properties, then measurement capability is provided, but mass load, viscous load, and viscoelasticity cannot be measured separately
Solution Approach 1:
The patent segments the measurement process by utilizing multiple overtone modes (fundamental mode and third overtone mode) to separately measure mass load, viscous load, and viscoelasticity. By dividing the frequency measurement into different harmonic components, each load type can be independently determined through specific calculation formulas.
Solution Approach 2:
The patent transitions from single-frequency measurement to multi-frequency measurement by incorporating both fundamental and third overtone modes. This dimensional expansion in the frequency domain enables the separation and independent measurement of different load components that cannot be distinguished in single-frequency measurements.
2Measurement precision
If conventional QCM measurement is used, then resonance frequency can be measured, but the effects of mass load, viscosity, and viscoelasticity cannot be differentiated
Solution Approach 1:
The patent uses the third overtone mode as a complementary measurement channel to the fundamental mode. By copying the measurement approach at a different harmonic frequency, the system gains additional information without requiring a completely different measurement device, thus differentiating load components while maintaining system simplicity.
3Measurement precision
If multiple overtone modes are used for measurement, then separate measurement of mass load, viscous load, and viscoelasticity becomes possible, but measurement complexity increases
Solution Approach 1:
The patent changes the operating frequency parameter from a single fundamental mode to include the third overtone mode. This parameter change enables the system to differentiate between mass load, viscous load, and viscoelasticity by utilizing the different responses of these load types at different overtone frequencies, with results calculated through specific formulas.
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 allows for the accurate measurement of mass load, viscous load, and viscoelasticity of substances by determining the variable C and subsequently calculating the respective terms, enabling correct characterization of substances interacting with a quartz oscillator.
Implementation Method 1
a quartz oscillator (7) comprising a crystal plate (8)
Implementation Method 2
changes in resonance frequency F s are measured
Data Source
AI summary
An object of the present invention is that any of mass load, viscous load and viscoelasticity load is measured separately from other load whereby properties of the substance to be measured are able to be measured correctly. The characteristic feature of the present invention is that, in a method where property of a substance contacting to a quartz oscillator equipped with electrodes on both sides of a quartz plate is measured on the basis of the changes in frequency of the above quartz oscillator, the property of the above substance is measured using at least two frequencies among the n-th overtone mode frequency (n = 1, 3, 5, ... (n = 2k + 1)) of quartz oscillator when voltage is applied between the above electrodes and using frequencies F1, F2 (F1 < F2) giving one half of the maximum value of conductance near the resonant point by each frequency.