Challenges in Design of an Orientation free Micro Direct Methanol Fuel Cell (µDMFC)

The need for increasing the energy density of the power sources for portable electronic applications is getting increasingly important. Hearing aid devices are among the most demanding portable products and require power generators with high energy generation capability. In the current paper the challenges in design and manufacturing of a micro direct methanol fuel cell (mDMFC) as the power generator in hearing aid devices is investigated. Among the different challenges in design for mDMFC, the CO2 bubble management and orientation independency of the cell are addressed by proposing a spring loaded mechanism. Furthermore, the feasibility and manufacturability of the proposed design are examined and discussed. The main purpose of this paper is to address the constraints in design for micro manufacturing considering the available manufacturing possibilities

Two-axis MOEMS Sun Sensor for Pico Satellites

A MOEMS sun sensor has been designed for DTUsat – a Danish student CubeSat project at the Technical University of Denmark. On the magnetotorquer controlled DTUsat sun sensors are needed along with a magnetometer to obtain unambiguous attitude determination for the ACDS and the payloads – an electrodynamic tether and a camera. Due to requirements such as low mass, high accuracy, and high FOV a solution different from the currently available is needed. By utilising resources from space and micro processing related fields a SOI based two-axis linear slit sensor chip with §70± FOV and a theoretical resolution of » 0:07± has been designed. The chip design enables elimination of various ambient factors such as e.g. temperature and cosine dependencies. This paper describes design, functionality, and process sequence of the device. A PCB with the chip and measuring electronics has been designed with a mass below 3g