Loading presentation...

Present Remotely

Send the link below via email or IM

Copy

Present to your audience

Start remote presentation

  • Invited audience members will follow you as you navigate and present
  • People invited to a presentation do not need a Prezi account
  • This link expires 10 minutes after you close the presentation
  • A maximum of 30 users can follow your presentation
  • Learn more about this feature in our knowledge base article

Do you really want to delete this prezi?

Neither you, nor the coeditors you shared it with will be able to recover it again.

DeleteCancel

Infrared in our daily life

No description
by

chiting lee

on 17 November 2013

Comments (0)

Please log in to add your comment.

Report abuse

Transcript of Infrared in our daily life

Infrared in our daily life
Introduction
Applications
Survey Results
Advantage and Disadvantage
Conclusion
Introduction
Infrared radiation heat permeates through some materials
Infrared (IR) light is electromagnetic radiation with longer wavelengths (700 nanometres (nm) to 1 mm)

frequency range : 430 THz down to 300 GHz

There are 3 types of Infrared light:
Advantage
Low power requirements
Low circuitry costs
Simple circuitry
Higher security
Portable
High noise immunity
Disadvantage
Line of sight
Blocked by common materials
Health Risks:burns, blindness,cancer and leukemia
Light, weather sensitive
Low Speed
• Near-infrared (near-IR) -
Closest to visible light,
wavelengths range : 0.7 - 1.3microns
used by a lot of electronic devices,e.g. remote controls

• Mid-infrared (mid-IR) -
wavelengths range:1.3 - 3 microns
used by a lot of electronic devices,e.g. remote controls

• Thermal-infrared (thermal-IR) -
the largest part of the infrared spectrum
wavelengths range: 3 microns - over 30 microns

Objectives:

The infrared technology with the use of IR in daily can be divided into 3 aspects:

wireless communication
heating
detection
Online Survey
Application
Wireless Communication
Showing the principle of Infrared radiation
Introduce the application of Infrared radiation
To investigate how the Infrared radiation commonly used in human's daily life.
What is the pros and cons of the Infrared radiation
Target : The public
Participants in the survey : 20
Topic : To investigate how the Infrared radiation commonly used in human's daily life.
Site : https://qtrial.qualtrics.com/SE/?SID=SV_d0dpj9PU3eLp47X
Job division
Reference
The transmitter :
two parts:an interface circuit & a source drive circuit
By yahoo(image):
http://hk.images.search.yahoo.com/images/



By One search:(key word:IR communication Show content type:Book/eBook)
From: Optical wireless communications: IR for wireless connectivity
eBook
by Ramirez-Iniguez, Roberto; Idrus, Sevia M; Sun, Ziran
ISBN 9780849372094 Date 2008
Subjects Infrared technology, Wireless communication systems, Optical communications


By WIKI:
Night vision:
http://en.wikipedia.org/wiki/Infrared#Night_vision

By google:
Advantage and Disavantage and Application:
(key word:"infrared technology")
http://trace.wisc.edu/docs/ir_intro/ir_intro.htm


By youtube: search " infrared radiation"

By HowStuffWork:
Thermometer:
http://science.howstuffworks.com/innovation/everyday-innovations/question312.htm

Night vision/introduction of IR:
http://electronics.howstuffworks.com/gadgets/high-tech-gadgets/nightvision.htm

Infrared heater:
http://home.howstuffworks.com/home-improvement/heating-and-cooling/infrared-heaters.htm
The drive circuit :
electrical signal -> an optical signal
by changing the current flow through the light source
2 types of optical light source:
(1) a light-emitting diode (LED) or (2) a laser diode (LD)
The information signal ------>The field of the optical signal
The optical field --------------> the receiver
modulate
a free-space
-introduction : Ng Wing Tung
- Application :Ng Wing Tung, Lee Chi Ting
- Survey : Tse Yam Chi
-Advantage & Disadvantage: Lee Chi Ting
- Conclusion: Tse Yam Chi
Wireless Communication
Survey Result
In this graph, we can see that people are widely used of infrared radiation nowadays.
Survey Result
People think that some applications of control are the most widespread.
The receiver :
two parts: (1) the optical detector and (2) the signal-conditioning circuit
Survey Result
The optical detector<------- the optical signal
The most frequently usage in infrared radiation is the remote control, peak at 80%.
Also infrared thermometer and heating are always used in our daily life.

Survey Result
In this question, the data shows the advantages in infrared radiation technology. Most people think that this technology is simple, with 33%. Also, low costs, low power requirement and portable are the advantages of infrared radiation technology, both of them stood at 20%.
Do you think Infrared radiation is widely used nowadays?
Which aspect of usage of IR that you think is the most widespread?

The signal-conditioning circuit :
regulates the detector output
.'. the receiver output = the original input(transmitter)
The optical detector:

(1)a semiconductor positive-intrinsic-negative (PIN) diode or (2)an avalanche photodiode
What are the advantages bring to you from Infrared radiation technology?
Which of the following thing that you always use?
Detection
Mind map
Use detector to detect thermal IR,then measure and convert
ear thermometer:
common sensor :e.g. thermopile
sees and measures the eardrum's infrared emissions
emissions ---> a temperature
displayed on an LCD
Detection
Conclusion
night vision--thermal imaging
A special lens focuses the infrared light emitted by things in view
The focused light <------ a phased array of infrared-detector elements

=>create a thermogram => translated into electric impulses

=>sent to a signal-processing unit

=>translates the information from the elements into data for the display.

=>sends the information-->the display

all the impulses from all of the elements -->the image.
scan
Heating
Infrared heater:
There are many different kinds of infrared radiation applications nowadays.
And people are now widely using these applications in different aspect.
The major reason of this is that these applications are convenient.
These advantages help people a lot and let them more willing to use infrared radiation application in their daily lives.
several types
direct infrared light straight into a space
-->heat produced on the object it reaches
contain three parts:infrared light bulbs, a heat exchanger and a fan
=>infrared light emitted---->heat exchanger
=>blows air onto the exchanger
=>heat ---->air
Thank You!
Full transcript