Optical Sensor Technology, Study notes of Optics

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Optical Sensor Technology

Wei-Chih Wang

University of Washington

Department of Mechanical Engineering

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The main goal of this course is to introduce the characteristics oflight that can be used to accomplish a variety of engineering tasksespecially in mechanical analysis.Manipulate phase modulation for mechanical measurement:monitoring changes in interference pattern due to a mechanicalmodulation

Objectives

sinA+sinB = 1/2sin(A+B) *cos(A-B)Let A =

ω

t 1

B =

ω

t 2

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Who am I? Why am I here?

•^

Research Assistant Prof. from Department ofMechanical Engineering and ElectricalEngineering, University of Washington

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Money!

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Recruiting YOU to UW!

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Making new friends

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Get students excited about optical sensortechnology

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What am I going to accomplish in

one week?

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Hope to bring you a new “light” into yourengineering curriculum. God created the world in 6 days. He said, "

Let there be

light

", and

there

was

light

illuminacion

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What is difference between

engineering and science?

• Engineering is an application of science• Methodical way of solving a particular large

class of problems.

• Engineering solution is different from

solving a Physics or Math problem wherethere are infinitely many different solution.

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How to solve it?

Cost effective, simple Complex but interesting

There is no right way or wrong way ofsolving an engineering problem…..It all depends on situation…….

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Final Presentation

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Pick a design based on some of the topics we talkabout in class. It does not have to be verycomplicated.

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Utilizing conventional literature search and onlineresources

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Observe your surrounding

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Use what you know

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Use What you have

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Pick an optical technique to measure somethingthat people haven’t thought of

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Final Presentation

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Choose an interesting application on what you learn fromthis week

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8 pages Powerpoint slides (send to me [email protected])

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Show only the key points, font size minimum 24

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Lot of visual aids

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Voice needs to be loud and clear and engaging

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Be animated

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Surprise the audience

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Say only what you know.. don’t pretend

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Goal: sell your idea to the audience!!!

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Sensor Definition

A device that responds to a physical stimulus,such as thermal energy, electromagneticenergy, acoustic energy, pressure, magnetism,or motion, by producing a signal, usuallyelectrical.

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My sensor definition

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Sensors imitating after the five human senses:gustatory (taste), olfactory (smell), tactile, auditory,and visual.

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Extension of our senses

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Que es Optical Sensor?

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Light is a form of energy which allow a physical entity to see and feel

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Optical sensor provides quantitative mesurant using optical energy.

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What can it sense?- pretty much everything...sight sound, taste, touch and smell in macroand micro and nano scale.

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Why optical technique?- sensitivity- free of EMI and RFI- compact- broaband- wide range spectrum provides unique applications

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Electromagnetic spectrum

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Visible light is a narrow part of the electromagneticspectrum and in a vacuum all electromagnetic radiationtravels at the speed of light:

o

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Light rays and light waves

Light rays and wavefronts

Wave from the bubble

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We can classify optical phenomena into one of three categories:

ray optics

,^ wave optics

, and

quantum optics

.