| Autor: |
Routier, Louis, Westrelin, Alexandre, Cerveaux, Anthyme, Louis, Gaël, Horlach, Thomas, Foulon, Pierre, Lmimouni, Kamal, Pecqueur, Sébastien, Hafsi, Bilel |
| Zdroj: |
Discover Applied Sciences; Aug2024, Vol. 6 Issue 8, p1-17, 17p |
| Abstrakt: |
Impedance analysis is a powerful technique that has become increasingly important in various applications, it represents a leap forward in the field of electronic measurments and diagnostics. In this work, we present the development of miniaturized, multiplexed, and connected platform for impedance spectroscopy. Designed for online measurements and adapted to wireless network architectures, our platform has been tested and optimized to be used for multi-selective chemical organic sensor nodes. This compact and versatile circuit is built from low cost and low power consumption (250 mW) microelectronics components that achieve long duration operability (5 days and 16 h) without compromising on sensor measurement accuracy and precision. We used the well-known impedance network analyzer AD5933 (Analog Devices, Norwood, MA, USA) chip which can measure a spectrum of impedances in the range 5 kHz to 100 kHz. The proposed system is based on ESP32-C3 Microcontroller enabling the management of the AD5933 through its I2C interface. Our system benefits from two multiplexer components CD74HC4067 allowing calibration process and the interface of 15 conductimetric sensors with real time acquisition (less than 90 ms per acquisition). The system is capable of relaying information through the network for data analysis and storage. The paper describes the microelectronics design, the impedance response over time, the measurement’s sensitivity and accuracy and the testing of the platform with embedded chemical sensors for gas classification and recognition.Article Highlights: Single calibration process: The main contribution of this paper is to propose a portable multiplexed impedance measurement system with a unique self-calibration capability. This capability is facilitated through the use of a single calibration resistor, which significantly enhances the speed of data acquisition. Materials study: To validate our system, a materials study was conducted, focusing on the use of a conductive polymer poly(3hexylthiophene) P3HT doped with various triflate metals. This research aims to assess the system's effectiveness in gas recognition applications, demonstrating its potential for accuracy and speed crucial attributes for modern detection technologies. Gas recognition: Our developed system has been designed to be suitable to assess volatile samples by their quality, to systematically expose them to the miniaturized array under a static blow (the PCA of the partial dataset of resistance modulation published in our former studies quantifies on the systematicity of the exposures by the organization of the data clusters).These labels are indeed crucial to quantify the materials response with environmental physical variables which may greatly vary within an environment. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
|
Full text from SpringerLink