Care Notebook Tutorial Basic Computer Terminology

You will hear these computer terms used throughout the Tutorial. If you are fairly new to computers, these definitions may be helpful to you in following the directions in this Tutorial. However, the step by step directions provided in the Tutorial will help you navigate fairly easily.

Browser - This is the program you use to surf the internet. There are several internet browsers available, some of the most popular are Internet Explorer, Firefox, and Netscape Navigator.
Click - To tap one of the mouse buttons. If clicking doesn't work, try 2 quick taps (double-click). In some instructions, click may mean double-click. If one click doesn't work, try double-clicking. Default--A value or setting that a device or program automatically selects if you do not specify a substitute. For example, word processors have default margins and default page lengths that you can reset. The default drive is the disk drive the computer accesses unless you specify a different disk drive. The default can also be an action that a device or program will take. For example, some word processors generate backup files by default.
Download – to transfer data from one computer to another. Downloading usually means to "receive" data and upload means to "send”.
Field – (also referred to as a form field) An area of a database record, or form, into which a particular item of data is entered . A field holds exactly one type of information about an item or subject. For example, on a form, there may be a Name field, an Address field and a Phone Number field.

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A Tutorial on TEM Transmission Lines

The concept of TEM transmission lines has been a distinct element of electronics engineering for well over 70 years [1, 2]. The term TEM (Transverse ElectroMagnetic [3], also known as Transverse Electric and Magnetic [4]) refers to a condition in which both the electric and magnetic fields are parallel to a boundary plane [5] and there are no longitudial components of either field.

Other terms such as transverse electric (TE) and transverse magnetic (TM) refer to conditions in which the electric field or magnetic field, respectively, of a propagating wave is parallel to a boundary plane, in this case being the surface of the conductors of a transmission line, while at the same time the accompanying magnetic or electric fields, respectively, still have some longitudinal (or axial) components [6]. Both of these terms are normally associated with wave guides [5].

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Electro-Optic Modulator Tutorial

This tutorial examines the working principles of an Electro-optic modulator for use as a demonstrative tool for graduate and undergraduate students. The electro-optic material used is a single-crystal film of DAST approximately 5 microns thick. This film is prepared by a special method (modified shear method, US patent issued). An electric field is applied across the sample such that the direction of the field is along the dipole axis of the material. Electro-optic modulation is observed for a light beam passing through the film when an electric field is applied. The reason for using the DAST film is that its electro-optic coefficient is exceptionally large (770 pm/V at 633 nm) that produces significant electro-optic modulation even for a single-pass through a thin film and for a low electric field.

Experimental setup:
The modulator comprises of a focusing lens, a collecting lens, a single-crystal film of an organic electro-optic material on a micro-positioner and electrical leads attached to the electrodes applied on the electro-optic film. The overall setup for an experimental demonstration involves a laser, a polarizer, an analyzer, an ac power supply, a photodiode, an oscilloscope and the electro-optic modulator. The incident laser beam passes through the polarizer which provides a 45 degree angle of polarization with respect to the vertical axis (dipole axis). The beam is then focused on the DAST sample within the electro-optic modulator. The beam passes through the analyzer and is collected into the photodiode. The modulation signal produced by the electro-optic effect caused by the applied electric field is then recorded using an oscilloscope.

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Visualizing electric fields

An electric field exists in the space around a charged object. When another charged object is placed in this electric field, an electric force acts on it. This tutorial is designed to help you explore the effects of these electric forces and how they vary throughout the space surrounding charged objects. In it, you will work with a variety of different visual representations of electric fields, as well as the mathematics on which they are based.

There are three layers of the tutorial:
Layer 1. Seeing the bare basics. Observe the visual representations.
Layer 2. Probing a bit deeper. Adjust numerical values to change the visual representations you've just observed.
Layer 3. Working towards mastery. Learn to create visual representations on your own.
Each successive layer will require more thought and effort on your part, but the reward will be a much more thorough understanding of electric fields.
The physics described here is based on the topics covered in recent lectures, and in Sections 23.1-23.4 & 23.6 of Serway and Beichner's "Physics for Scientists and Engineers". If you have questions about Mathematica (the program which runs this tutorial), stop in to one of the tutorial sessions in C2039 and talk to Dr. Poduska or a lab instructor (Kelly Shorlin or John Wells).

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Electric Fields Tutorial

Welcome to the Electric Fields Tutorial program. The program reviews a set of concepts that are important in understanding electric fields.
You will review
how to use a vector to represent the electric field
- how the force on a charged particle is related to the electric field.
- how to find the electric field at a point

You should already know
- what an electric charge is.
- the units used to measure electric charge.
- that electric fields exist around charged objects.
- the units used to measure electric field
You will need a calculator, paper, and a pencil or pen.

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