Godkända
Utveckling av en kapacitiv biosensor för användning i inbyggda system
Mattias Jönsson (E04)
Start
2008-10-27
Presentation
2009-05-28 10:00
Plats:
E:3139
Avslutat:
2009-06-16
Examensrapport:
Sammanfattning
This report describes the steps to build a capacitive measuring system of a biosensor and how previous systems have worked. The method of measuring capacitance is called ”Step response of an RC circuit”. This means that a potential step is put on the biosensor and the charging current over the biocell can be measured. Out of the measured current wave the capacitance can be calculated. Today it exist two different systems, the original from the 90s which is reasonably stable but are not user friendly and the source code is not available so it is a locked system and it is not possible to add new features or modify. The second system is written in Labview and is user friendly but not as stable as the original system. Both systems are designed for a lab environment but there is a need for a new system that is stable, user friendly and small. The motivation of this project is to make a small portable system that could be used outside the lab environment and implemented in industry. The new system was developed on a Linux platform to make it more cost efficient and new hardware to handle the analog signal was designed to get full control. An investigation of which platform to use was made so it would be possible to build an embedded system based on the new system in the future.
Handledare: Martin Hedström (Bioteknik, LTH) och Joakim Larsson (Nohau)
Examinator: Viktor Öwall (EIT)