DESIGN AND IMPLEMENTATION OF LIGHT SOURCE AND POWER SUPPLY OF PORTABLE VISIBLE LIGHT SPECTROPHOTOMETER FOR GLUCOSE CONCENTRATION MEASUREMENTS IN DIGITAL MICROFLUIDIC SYSTEM

• Main Author: Khilmi Assakandari, Balkan
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/70583
• Institution: Institut Teknologi Bandung

Digital microfluidics (DMF) is a liquid-handling technology that allows individual control of droplets on a grid of electrodes. It allows for the simultaneous movement, mixing, splitting, and dispensing of multiple droplets on an open surface. One example of DMF application in medical is to help mix microliter samples when determining glucose concentrations. Fluid samples that are the object of research using DMF generally have a limited volume due to their scarcity. Even so, quantitative and qualitative analyzes must still be carried out with this limited volume with an appropriate analytical method. Spectrophotometry can analyze the wavelengths and concentrations of these samples at low volumes. Spectrophotometry is a light analysis method that uses the absorbance of material against the light. In this case, the light spectrum produced by the spectrophotometer must be adapted for use in visible light (400-700 nm). The type of light source is essential in determining the accuracy of spectrophotometric measurements and the power system to be appropriately tuned to maximize the light source's spectrum. Therefore, the design and implementation of the light source and power subsystem of a portable visible light) spectrophotometer that focuses on glucose measurement in a designated DMF platform is carried out. A DC power system for Philips 7387 halogen lamp constructed using a 21700 battery for a portable visible light spectrophotometer. Two 21700 battery cells in series are used for the system with a total capacity of 5000 mAh. From the experiment results, the Lighting system produced a relatively flat spectral response across 400-700 nm with an average of 0.598 relative response out of 1, reducing software complexity in processing the information from the measurement. The power system is proven to run spectrophotometer measurement scenarios effectively for 3 hours. However, the testing shows an average voltage drop of 0.7 V from the battery.