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  Infrared Tutorial
•
 What is the history of IR?
•
 What is IR?
•
 Why can't I see IR?
•
 What kind of theory & technology is involved in IRT?
•
 How does it work?
Infrared Tutorial
Version 006
Copyright 2000-2003
www.ZyTemp.com / Radiant Innovation Inc.
--- All Rights Reserved ---

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  What is the history of IR?
The Royal Astronomer Sir William Herschel discovered "Dark Heat" radiation in 1800.
In 1880 the term "infrared" was coined. Samuel Langley invented the bolometer that measures variations of resistance when heated.
In 1901 a bolometer could detect a cow at 400 meters.
After World War II, many countries invest huge amounts of money in IR for military application.
In 2002 Radiant Innovation, has designed the most compact; most long battery life (70hours continuous use) and the most affordable IR Thermometer by the proprietary SoC & Infrared Technology, use MEMS based; advanced Thermal Sensor.
  What is infrared radiation (IR)?
IR just like any light ray, is an Electromagnetic Radiation, with lower frequency (or longer wavelength)

Anything above absolute zero (-273.15 degrees Celsius or 0 degrees Kelvin), radiates in the infrared. Even ice cube, snow, your refrigerator emit infrared.
  Why can't I see IR?
Your eyes are design for Sunlight, 2 kinds of species are identified to be able to detect IR: some rattle snake & beetle. But you still can sense the IR by your skin:Beside a campfire, you can feel the warmth from the IR.
When your car is baked by sun , you start the car, turn on Air-Con, the air is cooled,
But you still feel Baking-Hot!, that's IR come from the interior of the car, reaching your sensor (skin).
You may use IRT to learn that the radiation temperature in your car can reach 80degC!
  What kind of theory & technology is involved in IRT?
Believe or not, Quantum physics is the key theory:
the total radiation energy is proportional to the fourth power of the absolute temperature (Stefan-Boltzmann Law)
Wien Displacement Law: the product of the peak wavelength and the temperature is found to be a constant.
Wien get the Nobel Prize for Physics for the year 1911.
These are the major earthquake in physics, after that Classic Physics crashed, Quantum Physics flourish.
  How does it work?
The sensor in this IRTcollect the tiny energy (usually 0.0001 watt) from the target,
amplify by a precision amp, convert it into voltage output.
The CPU then digitize the signal by a 16bit Analog to Digital Converter,
the Arithmetic Unit then solve the temperature equation by the above Nobel Prized Laws ,
and compensate the ambient temperature and emissivity effect, you get the temperature of the target within seconds after you push that switch.

For those who want to know more, try Georgia State University's Hyper Physics :
they provide excellent tutorial, equations and examples.
   
Copyright (c) 2000-2007 RADIANT INNOVATION INC. All Rights Reserved.
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Iceland: Innrauðir hitanemar Italian: termometro infrarosso Termometro-pirometro Netherlands (Nederland): Infrarood thermometer Norway: Infrarøde termometere Finish: infrapuna ämpömittari Polish: Pirometr Portuguese: termômetro infravermelho Russian: пирометр Spanish: termómetro infrarrojo
Swedish: IR-termometrar Turkey: Pirometreler Yugoslavia: Teletermometar Japanese: «D±µàD?«×­p, ¨ª¡~½u?«×­p
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