Multi-channel Cell Counter Utilizing The Aperture Impedence Technique

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This poster was presented at CCECE'02 in association with a paper submitted at the conference.

Most people have their blood tested at some point during their lives. Blood is a vital body fluid and the quality of blood is an important indication of health. One measure is the number of cells per cubic millimeter of blood. Our device aims to shorten the turn around time for blood tests. We would also like to (a) reduce the cost so clinics can afford to own blood cell counters, (b) miniaturize the testing equipment, and (c) maintain or improve accuracy.

PowerPoint Presentation

Contributors:
Aaron Lee
Dr. Ash Parameswaran

A Surface Micromachined Bistable Switch

Micro-mechanical transmission systems and optical networks require fast and efficient switches capable of maintaining one of 2 stable states at any given time.

Ideally, bistable switches require no energy to maintain either of their 2 states and only a small input of energy to switch from one state to the next. Hence, an effective micromachined bistable switch would be more energy efficient than the current monostable switches used. The design and implementation of such a switch is the purpose of this project.

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Contributors:
Ian Foulds
Maria Trinh
S. Hu
S. Liao
Robert W. Johnstone
Dr. Ash Parameswaran

SEM

Required Minimum Feature Spacing for Commercial Viability of Surface Micromachined Optical Systems

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This poster was presented at CCECE'02 in association with a paper submitted at the conference.

This poster briefly outlines how a value was derived for the required minimum feature spacing necessary for surface micromachined optical systems to achieve commercial viability. The poor performance of current surface micromachined optical systems, in large part, stems from the relatively large misalignment of their optical components. The paper also aims to provide a closed-form solution expressing the insertion loss due to optical misalignment as a function of the minimum feature spacing. Assuming that the highest insertion loss acceptable in a commercial optical switch is 1 dB, the closed-form solution implies that the minimum feature spacing must be less then 0.37 mm for commercial viability.

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Contributors:
Robert W. Johnstone

MEMS3D Software

Billed as a giant tool for tiny designs, MEMS3D is software that creates a full 3D model from layout data. This allows you to get a good look at you MUMPs designs before fabrication.

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Contributors:
Hanjin Cho
Natasha Chan

3D-Model

Surface Micro-machining with MUMPs

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This poster presents a current picture of surface micro-machining design in general. By using illustrative examples from the Multi-User Micromachining Process (MUMPs®), it illustrates several characteristics of micromachines that apply to all surface micro-machined devices.

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Contributors:
Robert W. Johnstone

The Effects of Proton Irradiation on Electro-Thermal Actuators

To determine if MEMS are usable in hard environments, in particular space, several electro-thermal actuators were subjected to proton irradiation at the TRIUMF facility. Little change was seen in their behaviour.

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Contributors:
Robert W. Johnstone
Kevin Ko
Janey Yang
Lorne S. Erhardt (Defense Research Establishment Ottawa)
Dr. Ash Parameswaran

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Free-space Micro-Optic-Switch

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This poster presents work done on the design and simulation of a micro-optic- switch. A multi-domain problem, the poster briefly outlines all the different types of simulation required and the results obtained.

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Contributors:
Robert W. Johnstone

MUMPs Design Handbook: Unofficial Supplement

In the process of teaching several courses on surface micromachining, it has become obvious that there is a severe gap in the existing documentation. In articles and in books, authors approach the subject from one of two directions: processing knowledge or device knowledge. These two approaches neglect an important bridge between the fabrication process and actual device implementation. This document aims to fill in that gap.

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Contributors:
Robert W. Johnstone

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