The Implementation of Cost-Effective Data Acquisition System for Acoustic Emission Sensor using Variable Gain Preamplifier and STM32F4 Microcontroller Interface

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Chavadol Mekchar
Wipawadee Wongsuwan
Warakorn Srichavengsup
Wimol San-Um


this paper presents the Data Acquisition (DAQ) system that particularly collects Acoustic Emission (AE) signals in the range of 1 kHz to 500 kHz from the sensor, and transmits to a personal computer for further signal analyses. The proposed system comprises two major components, i.e. a variable gain preamplifier and a STM32F4 microcontroller. The variable gain preamplifier is implemented using BiMOS operational amplifier model CA3140 which provides relatively high input impedance and high-speed performance. The signal is subsequently digitized by STM32F4 Microcontroller and transmits to data analysis software via serial communication (RS232). Simulations are performed through Orcad PSpice and a MATLAB Simulink. Signal quality analysis involves frequency response, Total Harmonic Distortion (THD), and Power Spectral Density (PSD). Experiments show that the proposed system offers a potential alternative to commercially available data acquisition systems.


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