INSTRUMENTATION SYSTEM DESIGN TO DETECT SUFACE PLASMON RESONANCE PHENOMENA USING ESP32-CAM

• Main Author: Rizky Fadhlurrohman, Kemal
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/76610
• Institution: Institut Teknologi Bandung

Surface Plasmon Resonance (SPR) sensor is a measurement instrument that utilize the optical phenomenon known as SPR. Plasmon oscillations at the metal- dielectric interface lead to a reduction in intensity of the reflected visible light at the metal-dielectric interface that can be observed. The SPR sensor has been widely employed in biosensing applications due to its ability to detect changes in the resonance angle resulting from interactions between analyte molecules and the other molecules deposited on the metal layer. In this study, an SPR detector utilizing the ESP32-CAM microcontroller was developed. This SPR detector uses an optical design tailored to the Kretschmann configuration, angle modulation analysis, and a portable device design with relatively low manufacturing costs. The conventional light detector in the sensor was replaced with an OV2640 camera module mounted on the ESP32-CAM microcontroller, enabling digital image processing to determine the value of the reflected light intensity. The control system of the camera-based SPR detector is operated using the ESP32- CAM microcontroller. The detector control system can be controlled by the user through a Graphical User Interface (GUI) application, which also serves as a medium for visualizing SPR curve. Experimental testing using a gold-coated prism with a thickness of 20 rim and air as the dielectric medium demonstrated that the developed SPR detector successfully detected the SPR phenomenon occurring in the optical system. However, further development in the hardware platform design, electrical system, and optical system optimization is still required to enhance the accuracy, sensitivity, and reproducibility of measurement data.