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Commercial and Custom Quartz Tuning Forks for Quartz Enhanced Photoacoustic Spectroscopy: Stability under Humidity

Diba Ayache¹, Roman Rousseau¹, Elena Kniazeva^1,2

¹IES, CNRS, University Montpellier, 34095 Montpellier, France.

Sensors (Basel, Switzerland)

|March 30, 2023

Summary

Commercial quartz tuning forks (QTF) are suitable for Quartz Enhanced Photoacoustic Spectroscopy (QEPAS) under controlled humidity. However, custom QTFs show stable performance, while commercial ones become unpredictable at higher humidity levels.

Keywords:

QEPAS Quartz tuning forks sensing spectroscopy

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Area of Science:

Physics
Materials Science
Analytical Chemistry

Background:

Quartz tuning forks (QTF) are crucial components in Quartz Enhanced Photoacoustic Spectroscopy (QEPAS) sensors.
Understanding QTF behavior under varying environmental conditions, particularly humidity, is essential for reliable sensor performance.
Previous studies have not comprehensively evaluated the impact of humidity on both commercial and custom QTFs for QEPAS applications.

Purpose of the Study:

To investigate the influence of humidity variations on the performance of commercial and custom quartz tuning forks (QTF).
To determine the humidity levels at which QTF parameter deviations cause significant theoretical errors in Quartz Enhanced Photoacoustic Spectroscopy (QEPAS) signals.
To assess the suitability of commercial QTFs for QEPAS applications under varying humidity conditions.

Main Methods:

QTFs were subjected to controlled humidity variations within a specialized chamber.
Resonance tracking was employed to measure key QTF parameters: resonance frequency and quality factor.
The theoretical error threshold for QEPAS signals was defined at 1% deviation due to parameter changes.

Main Results:

Both commercial and custom QTFs exhibited similar performance at controlled, lower humidity levels.
Custom QTFs demonstrated stable parameter variations within acceptable limits as humidity increased from 30% to 90% RH.
Commercial QTFs displayed unpredictable behavior and significant parameter deviations at higher humidity levels (30-90% RH).

Conclusions:

Commercial QTFs are viable and cost-effective for QEPAS under stable humidity conditions.
Custom QTFs offer superior performance stability and reliability in environments with fluctuating humidity.
Further research may be needed to mitigate the humidity-induced instability of commercial QTFs for broader QEPAS applications.