Print Email Facebook Twitter Cell Concentration Sensor for Micro-Bioreactors: Software & Data Processing Title Cell Concentration Sensor for Micro-Bioreactors: Software & Data Processing Author Keijsers, J.G.M. Mahabir, A.S.U. Contributor Bossche, A. (mentor) Bastemeijer, J. (mentor) Faculty Electrical Engineering, Mathematics and Computer Science Department Electronic Instrumentation Programme Electrical Engineering Date 2014-07-04 Abstract This thesis was written for the bachelor’s final project, of the study Electrical Engineering. It describes the design of a cell concentration sensor. A proof of concept was designed which is able tomeasure the cell concentration of yeast in a suspension by using sensors which measure the impedance and optical properties of the suspension. The project is divided into three parts where each duo will have their own focus. This thesis focuses on the software and data processing subsystem. The other pairs will focus on the optical and impedance sensors The signals from both sensors are converted to digital values. To process the raw data, filters are designed to condition the signal. Using the filtered data, routines are implemented to calculate the cell concentration. This value is transferred to a computer, where a user interface is implemented to graphically display the progress of the cell concentration. Using only the optical sensor, the measurements were accurate to about 40% in the range 0-10 g/l, and 10% in the range 10-120 g/l, making the total range 0-120 g/l. The impedance sensor was extend the range of the measurements to 0-150 g/l with an accuracy of 15%. However, the calculations needed to convert impedance values into cell concentrations were too sensitive for the microcontroller The routines for the optical sensor were successfully implemented on an Arduino microcontroller showing promising results. This was achieved with the help of a graphical user interface which was designed for validation when actual yeast measurements were performed. Although the routines for the impedance sensor yielded correct results for capacitance, the implementation of the code on the Arduino gave erroneous values when cell concentration was measured. Subject cellconcentrationsensoropticalimpedancesoftwareprocessingApplikon To reference this document use: http://resolver.tudelft.nl/uuid:f130c73b-4e40-4e0e-857d-ba66bf0afa06 Embargo date 2019-07-03 Part of collection Student theses Document type bachelor thesis Rights (c) 2014 Keijsers, J.G.M.