QCM Sensor Corrosion Measurement Humidity Interference
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Solution Overview
Problem
Existing environment monitoring devices face challenges in accurately measuring corrosive gas levels due to interference from humidity and particle adhesion, which complicates the determination of corrosion rates in electronic equipment environments.
Innovation Solution
The device employs a combination of measuring and reference QCM sensors, along with a humidity sensor and a control unit, to differentiate between corrosion and humidity-induced mass changes by using a correction coefficient to account for particle adhesion differences between sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a QCM sensor with a corrosive metal electrode is used to detect corrosive gas, then measurement sensitivity and response speed are improved, but measurement precision deteriorates due to interference from humidity and particle adhesion
Solution Approach 1:
The measurement system is segmented into two separate QCM sensors: a measurement QCM sensor with a corrosive metal electrode that responds to both corrosive gas and humidity/particles, and a reference QCM sensor with a corrosion-resistant electrode that responds only to humidity and particles. By separating the measurement functions, the system can isolate and subtract the humidity interference component, thereby resolving the contradiction between rapid response and measurement precision.
Solution Approach 2:
The reference QCM sensor acts as an intermediary that measures the environmental interference (humidity and particle adhesion) separately. Its output is used as a correction signal to compensate for the interference in the measurement QCM sensor's reading, enabling accurate determination of corrosion rate despite the presence of humidity and particles.
2Device complexity
If a single QCM sensor is used for monitoring, then device complexity is reduced, but measurement precision deteriorates due to inability to differentiate corrosion from humidity effects
Solution Approach 1:
The monitoring system is divided into functionally distinct segments: a measurement QCM sensor for detecting total mass change (corrosion + humidity/particles) and a reference QCM sensor for detecting interference (humidity/particles only). This segmentation enables the system to maintain simplicity while achieving precise corrosion measurement through differential calculation.
Solution Approach 2:
The system changes the material parameter of the electrode between the two sensors - using a corrosive metal for the measurement sensor and a corrosion-resistant metal for the reference sensor. This parameter change creates different response characteristics that can be mathematically processed to extract pure corrosion information from the combined signals.
3Measurement precision
If correction for humidity interference is implemented, then measurement precision is improved, but device complexity increases due to additional sensors and processing
Solution Approach 1:
The measurement QCM sensor and reference QCM sensor are merged into a single integrated monitoring system with unified control and processing. The control unit simultaneously processes signals from both sensors and performs differential calculation to extract corrosion rate, combining the functions of corrosion detection and humidity compensation into one cohesive system that minimizes overall complexity.
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 precise measurement of corrosion rates in electronic equipment environments, effectively isolating the impact of humidity and particle adhesion, thereby improving the accuracy of corrosive gas monitoring.
Implementation Method 1
The QCM sensor is a mass sensor that has a quartz oscillator and an electrode formed on the surface of the quartz oscillator. The QCM sensor uses a phenomenon in which when the mass of the electrode increases due to corrosion, the oscillation frequency of the quartz oscillator is reduced according to the amount of corrosion.
Implementation Method 2
a humidity sensor, which detects humidity in the atmosphere and outputs a humidity signal indicating the detected humidity
Data Source
AI summary
An environment measuring device 1 has a measuring QCM sensor 10, a reference QCM sensor 20, a measurement oscillation circuit 15, a reference oscillation circuit 25, a frequency counter 31, a humidity sensor 51, a control unit 40, and a storage unit 41. The measuring QCM sensor 10 has an oscillator and an electrode formed by a corrosive metal on the surface of the oscillator, and the reference QCM sensor 20 has an oscillator and an electrode formed by a corrosion-resistant metal on the surface of the oscillator. The storage unit 41 stores the measurement count signal, the reference count signal, and the humidity signal which are associated with a measurement time. The control unit 40 determines an amount of increase in mass due to the corrosion of the electrode of the measuring QCM sensor by using the measurement count signal and the reference count signal.