Crystal Oscillator with Uneven Electrode for Density Viscosity Measurement
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Solution Overview
Problem
Conventional QCM methods face challenges in separately measuring solution density and viscosity due to frequency changes being correlated with the product of density and viscosity, making it difficult to determine these values simultaneously using a single detector, and existing multi-detector solutions are laborious and costly with low measurement accuracy.
Innovation Solution
A crystal oscillator with electrodes on both surfaces of a piezoelectric plate and an uneven surface on one electrode or detector, measuring frequency changes on an admittance circle diagram to isolate density and viscosity measurements using a single detector, allowing for independent or simultaneous measurement of solution density and viscosity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple detectors are provided for a single piezoelectric plate to measure solution density and viscosity separately, then measurement capability is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent divides the measurement function into two separate crystal oscillators, each with a single detector. One oscillator is dedicated to density measurement while the other is dedicated to viscosity measurement. This segmentation allows each oscillator to be optimized for its specific measurement task, avoiding the complexity of multiple detectors on a single plate while maintaining comprehensive measurement capability.
2Adaptability or versatility
If multiple detectors are provided for a single piezoelectric plate to measure solution density and viscosity separately, then measurement capability is improved, but manufacturing cost increases
Solution Approach 1:
The patent divides the measurement function into two separate crystal oscillators, each with a single detector. This segmentation simplifies the manufacturing process compared to creating multiple detectors on a single plate, as each oscillator can be produced using standard single-detector fabrication procedures, thereby reducing overall manufacturing cost while maintaining comprehensive measurement capability.
3Device complexity
If a single sensor is used to measure both density and viscosity, then device complexity is reduced, but measurement accuracy decreases due to correlation between density and viscosity in frequency changes
Solution Approach 1:
The patent segments the measurement function into two separate crystal oscillators, each dedicated to measuring one property (density or viscosity). This eliminates the correlation problem between density and viscosity that plagues single-sensor measurements, as each oscillator measures only its designated property independently, thereby maintaining high measurement accuracy while keeping device complexity manageable through modular design.
Solution Approach 2:
The patent creates a universal measurement system consisting of two crystal oscillators that can measure both density and viscosity. Each oscillator is designed with a single detector optimized for its specific measurement task, providing accurate measurements for both properties without the compromises of multi-functional single sensors.
4Measurement precision
If standard curve preparation requires multiple standard samples, then measurement accuracy is improved, but time consumption increases
Solution Approach 1:
The patent divides the measurement system into two separate crystal oscillators, each optimized for a specific measurement task. This segmentation allows for simplified standard curve preparation, as each oscillator can be calibrated independently with fewer standard samples, thereby reducing the time required for preparation while maintaining measurement accuracy.
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
Enables accurate measurement of solution density and viscosity using a single detector, overcoming the limitations of conventional QCM methods by providing a cost-effective and efficient solution with improved measurement accuracy.
Implementation Method 1
a crystal oscillator (3) including electrodes (2) formed on both surfaces of a piezoelectric plate (1)
Implementation Method 2
The QCM (Quartz Crystal Microbalance) method that utilizes the resonance phenomenon of a crystal oscillator allows for the detection of even very small mass changes
Data Source
AI summary
A crystal oscillator, and a measurement method using same are provided with which the density of a solution can be measured alone, or both the density and the viscosity of a solution can be measured at the same time using a single detector provided for the crystal oscillator. A material to be measured is contacted to the crystal oscillator, and the crystal oscillator that includes electrodes formed on both surfaces of a piezoelectric plate, and an uneven-surface formed either on one of the electrodes disposed on the side in contact with the material to be measured, or on a detector formed on the electrode is oscillated. An amount of change in frequency (f2) that corresponds to the high-frequency side of two frequencies that represent a half value of a conductance maximum value of the crystal oscillator is measured to measure a density of the material.