Piezoelectric Sensor Frequency Stabilization via Reference Solution
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Solution Overview
Problem
Piezoelectric sensing devices require a lengthy stabilization period for oscillation frequency, making it difficult to accurately sense trace substances in fluids or gases, as the operator must wait for frequency stabilization before measurement, which can lead to reduced detection accuracy or increased measurement time.
Innovation Solution
A sensing device that uses a piezoelectric sensor with an absorption layer, where a reference solution is supplied to measure and stabilize the oscillation frequency at set intervals, allowing for accurate determination of frequency stability and enabling the output of a sample solution supply signal when stability meets a tolerance value, ensuring high accuracy in substance detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the oscillation frequency of the piezoelectric piece is allowed to stabilize naturally before measurement, then the measurement accuracy is improved, but the measurement time is significantly increased
Solution Approach 1:
The patent applies preliminary action by supplying a reference solution before the actual sample solution to pre-stabilize the oscillation frequency in liquid phase. This preliminary stabilization process occurs during the reference solution supply period, so when the sample solution is supplied, the frequency is already stable, eliminating the need for additional waiting time and enabling immediate accurate measurement.
Solution Approach 2:
The system uses itself to stabilize the frequency by circulating the reference solution through the measurement cell during the reference period. The piezoelectric piece oscillates in the reference solution, and the system automatically adjusts and stabilizes the frequency without external intervention, making the stabilization process self-contained and efficient.
2Measurement precision
If a long waiting period is provided for frequency stabilization, then the detection accuracy is improved, but the productivity is reduced
Solution Approach 1:
The reference solution supply phase serves as a preliminary action period where the system pre-stabilizes the oscillation frequency. This preliminary stabilization is performed once at the beginning, and subsequent sample measurements can proceed immediately without repeated stabilization waits, thereby improving throughput while maintaining accuracy.
Solution Approach 2:
The patent maintains continuous useful action by ensuring that the piezoelectric piece remains in oscillation throughout both the reference solution supply and sample solution supply phases. The frequency stabilization achieved during the reference phase continues to benefit subsequent measurements, eliminating idle waiting time and maintaining continuous productive operation.
3Measurement precision
If the operator manually monitors frequency stabilization, then the measurement accuracy can be maintained, but the device complexity and operational difficulty are increased
Solution Approach 1:
The system incorporates automatic feedback control by continuously monitoring the oscillation frequency during the reference solution supply phase and comparing it against stabilization criteria. When the frequency meets the stabilization conditions, the system automatically transitions to sample measurement mode, eliminating the need for manual operator judgment and reducing operational complexity while maintaining high accuracy.
Solution Approach 2:
The measurement system performs self-monitoring and self-judgment of frequency stabilization through automated algorithms that evaluate frequency data during the reference phase. This self-service capability removes the burden of manual monitoring from the operator and simplifies the control interface while ensuring consistent accuracy standards are met.
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 easy and accurate sensing of substances by stabilizing the oscillation frequency of the piezoelectric sensor using a reference solution, ensuring that the measurement is initiated only when the frequency is stable, thereby improving detection accuracy and reducing measurement time.
Implementation Method 1
a piezoelectric sensor which is structured by forming an absorption layer on an electrode provided on a piezoelectric piece 41, 633 and senses, by making the absorption layer 46 adsorb a substance to be sensed in a sample fluid 9, 100, the substance to be sensed based on a variation in natural frequency of the piezoelectric piece
Implementation Method 2
making the adsorption layer formed on an electrode provided on a piezoelectric piece adsorb a substance to be sensed in a sample fluid
Data Source
AI summary
To provide a sensing device capable of easily sensing a substance to be sensed with high accuracy. When sensing, by supplying a sample solution to an absorption layer 46 while oscillating a quartz-crystal resonator 4 to make the absorption layer absorb a substance to be sensed in the sample solution, the substance to be sensed based on an amount of variation in an oscillation frequency of the quartz-crystal resonator 4 after an absorption time elapses, the quartz-crystal resonator 4 is oscillated, before supplying the sample solution to the absorption layer 46, to measure the oscillation frequency of the quartz-crystal resonator 4 at a predetermined measurement interval, for instance, at every one second, and the oscillation frequency of the quartz-crystal resonator 4 is stabilized for the same period of time as a measuring time 19 until the measurement result becomes equal to or less than a frequency tolerance value 19b previously set based on a measurement sensitivity of the substance to be sensed.