Victor Lamarre--Colliot¶
page perso¶
06/01/2025¶
Powerpoint :
1-QCM
2-Mellia
3-Openbeelab
Découverte wiki fablab Openbeelab (ici), rdv Hamida, partage tâches et recherches google scholar
Articles :
Review QCM
summary : This article reviews the various electronic interfacing techniques used with Quartz Crystal Microbalance (QCM) sensors, which are widely utilized for measuring mass, viscosity, temperature, and humidity in diverse environments, including gases and liquids. It highlights the importance of selecting the appropriate electronic system for accurate QCM measurements. The paper discusses several QCM measurement methods, including impedance-based analysis, conventional and lock-in oscillators, exponential decay methods, and phase-mass characterization. It compares these methods' performance and provides recommendations for system improvements, particularly for high-temperature applications using crystals like GaPO4 and Langasite.
QCM sensors work based on the piezoelectric effect, where a quartz crystal’s oscillation frequency shifts in response to the mass of a deposited material. These sensors have become essential in biosensing, chemical detection, and other applications, especially in liquid media. The article also explores the challenges in operating QCMs under varying conditions, such as temperature changes, and discusses advances in sensor sensitivity, including electrodeless QCMs and Film Bulk Acoustic Resonators (FBAR).
For high-temperature environments, the paper emphasizes the use of novel materials like GaPO4, which can operate at temperatures up to 900°C, surpassing the limitations of traditional quartz crystals. The review also includes a comparison of different QCM electronic interfacing systems, with recommendations tailored for specific applications. The paper concludes by analyzing the design considerations for high-temperature QCM systems and offering insights into their performance and stability.
VOCs frequencies and QCM
summary : This article reviews the use of Quartz Crystal Microbalance (QCM) devices for detecting and quantifying volatile organic compounds (VOCs), which are a growing concern due to their environmental and health risks. VOCs, emitted by both natural and anthropogenic sources, can contribute to global warming and pose health risks to humans, animals, and plants. Detecting and discriminating these compounds is crucial for various applications, including environmental monitoring, food safety, and medical diagnostics.
QCM sensors are highlighted as an effective tool for VOC detection, with their ability to measure mass changes from absorbed VOCs on the sensor surface. The review focuses on the development of QCM-based sensor arrays for selective VOC detection, employing various coatings such as polymers, macrocycles, and ionic liquids to enhance sensitivity and selectivity. These coatings are crucial for improving the sensor's ability to differentiate between different VOCs.
Additionally, the review covers advances in electronic systems for QCM devices, which help improve measurement accuracy and sensitivity. Traditional VOC detection methods, such as gas chromatography and Fourier Transform Infrared spectroscopy, are mentioned but are noted for their complexity, high cost, and slower processing times compared to QCM-based sensor arrays.
Finally, the review emphasizes the importance of statistical analysis techniques in interpreting QCM data and creating sensor arrays that can detect a wide range of VOCs. The article concludes by summarizing current developments in QCM electronics and the potential for further improvements in VOC detection.
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summary :
07/01/2025¶
solutions similaires openbeelab
We find a lot of similar weighing systems to sell, the major part of them uses a strain gauge under the frame and sends information over WiFi.
balance cellules charge
Création d'un powerpoint pour faire état de l'art des solutions actuelles powerpoint
09/01/2025¶
Il pourrait être bien de pré-percer des trous dans la partie basse du châssis en prévision d'installer des pieds qui permettraient de maintenir le niveau de la balance dans un environnement ou le sol n'est pas au niveau.
Aussi, ceci permettrait de maintenir le contre-poids dans les airs.
Nous avons démonté la balance mécanique openhivescale, nous cherchons à l'améliorer. Un support de contre-poids a été modélisé sur freecad, et des solutions techniques concernant l'électronique sont en discussion.
10/01/2025¶