Frequency Measuring Device with Dynamic Oscillator Control
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Solution Overview
Problem
Existing odor sensors using quartz crystal microbalance (QCM) devices face challenges in selectively adsorbing target substances due to non-selective adsorption films and the 'drawing effect' between oscillation circuits, which affects frequency measurement accuracy and requires sorting of resonators with different frequencies, leading to inefficiencies and surplus resonators.
Innovation Solution
A frequency measuring device with multiple resonators and oscillation circuits, each with a frequency regulator, a measuring circuit, and a control circuit that adjusts frequency differences between oscillation signals to prevent the drawing effect, eliminating the need for pre-sorting resonators and reducing surplus, while maintaining high accuracy and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple resonators with different resonance frequencies are used to identify a large number of odorous substances, then the identification capability is improved, but the drawing effect occurs between oscillation circuits causing frequency measurement errors
Solution Approach 1:
The patent applies preliminary action by pre-setting frequency differences between oscillation circuits before operation. The control circuit is configured to maintain predetermined frequency differences between multiple oscillation circuits, preventing the drawing effect from occurring in the first place rather than correcting it after it occurs.
Solution Approach 2:
The patent utilizes parameter changes by dynamically adjusting the resonance frequencies of oscillation circuits. The control circuit changes the frequency parameters of oscillation circuits to maintain a predetermined frequency difference, thereby preventing the drawing effect while allowing multiple resonators to operate simultaneously for enhanced identification capability.
2Measurement precision
If resonators are sorted in advance to prevent the drawing effect, then frequency measurement accuracy is improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent applies self-service by enabling the control circuit to automatically manage and adjust the frequencies of oscillation circuits. The system self-regulates the frequency differences between circuits without requiring external sorting or manual intervention, thereby maintaining measurement accuracy while reducing device complexity and manufacturing costs.
3Reliability
If resonators are sorted to eliminate frequency overlap, then the drawing effect is prevented, but surplus resonators are generated leading to increased loss of substance
Solution Approach 1:
The patent applies dynamics by making the frequency allocation dynamic rather than static. The control circuit actively manages and adjusts the frequencies of oscillation circuits in real-time, allowing all resonators to be utilized effectively without requiring pre-sorting or discarding of surplus components. This dynamic frequency management prevents the drawing effect while maximizing the utilization of available resonators.
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
Prevents the drawing effect, enhances measurement accuracy, reduces power consumption, and simplifies the configuration of the frequency measuring device by dynamically adjusting frequency differences between oscillation signals, thereby improving the identification of odorous substances without the need for extensive resonator sorting.
Implementation Method 1
a resonator having an adsorption film and an oscillation circuit connected to the resonator
Implementation Method 2
when a substance contained in a surrounding medium is attached to the surface of a quartz crystal resonator under a resonant condition, the resonance frequency changes
Implementation Method 3
an oscillation circuit connected to the resonator
Data Source
AI summary
A frequency measuring device according to an embodiment of the invention includes a first resonator provided with a first adsorption film, a second resonator provided with a second adsorption film, a first oscillation circuit which is connected to the first resonator and is provided with a first frequency regulator that can regulate the frequency of a first oscillation signal and output the first oscillation signal, a second oscillation circuit which is connected to the second resonator and is provided with a second frequency regulator that can regulate the frequency of a second oscillation signal and output the second oscillation signal, a measuring circuit which can measure the frequencies of the first oscillation signal and the second oscillation signal, and a control circuit which can control the first frequency regulator and the second frequency regulator.