Neo Thermo TVS-700

What is Infrared Thermography?


Definition of Infrared Thermography

Infrared thermography is equipment or method, which detects infrared energy emitted from object, converts it to temperature, and displays image of temperature distribution. To be accurate, the equipment and the method should be called differently, the equipment to be called as infrared thermograph and the method to be called as infrared thermography. Recently, however, more and more public literatures show tendency not to pay attention to such appellative. We call our equipment as infrared thermography considering such generalization of the terminology.
 

Characteristics of Infrared Thermography equipment

  1. It captures as a temperature distribution on a surface,and it can display as a visible information.
  2. Temperature can be measured from a distance without contacting an object.
  3. Temperature can be measured in real time.
 

Merits of Infrared Thermography equipment

  1. Relative comparison of distribution of surface temperature can be made over a wide area.
  2. Temperature can be measured easily for a moving object or an object which is dangerous to get close to.
  3. Temperature of small object can be measured without confusing the temperature.
  4. Temperature of food, medicine or chemicals can be measured in a sanitary fashion.
  5. Temperature of an object with drastic temperature change or a phenomenon during a short period of time can be measured.
 

Infrared Thermography equipment, Things often misunderstood

 
  1. <Q> Isn't infrared camera emitting something?
    <A> No, it is not emitting anything: It merely detects infrared emitted from an object in a passive manner. It should be noted, however, that it may be affected by the reflection from the vicinity.
  2. <Q> Isn't the temperature measured by the wave length You can see an object behind something through it, can't you?
    <A> No, Temperature distribution is measured by the amount of infrared energy.
  3. <Q> You can see an object behind something through it, can't you?
    <A> No, Because infrared emitted from the surface of an object is detected, you cannot see through something. However, you may be able to estimate the rear side if there is a temperature distribution appearing on the surface due to the difference in heat conductivity.
 

What is Infrared Thermography?

 
  1. Discovery of infrared
    It was discovered by a British astronomer, Herschel, in 1800. When dispersing sunlight using a prism, Herschel accidentally found that there was an invisible light on the outside of red light when increases the temperature of an object.
  2. It is an electromagnetic wave
    Wavelength is 0.7µm or longer Wavelength is 1mm or less = Frequency is 300GHz or more.

Thermography:What is Infrared Thermography?

The source : R.D.Hudson, Jr. "INFRARED SYSTEM ENGINEERING" (John Wiley & Son, 1969)

 

Characteristics of infrared

 
  1. It is invisible since its wavelength is longer than visible light.   It has nothing to do with brightness or darkness of visible light
  2. It is emitted naturally from any object of which temperature is absolute zero(0K) or higher.  Therefore, it can be applied to any field
  3. It has a characteristic of heating an object.  Therefore, it is sometimes called "heat wave".
  4. It is a kind of light (electromagnetic wave)  It can be transmitted through vacuum.
  5. There is a correlation between infrared energy and temperature of an object.  Therefore, it can be used to measure the temperature of an object
 

How the heat transfers

 
  1. Emission:
  2. A type of heat transfer where the heat is transferred directly from the surface of an object as an infrared energy.
  3. Convection:
  4. A type of heat transfer where the heat is transferred by the heated part of gas or liquid moving upward.
  5. Conduction:
  6. A type of heat transfer mainly through a solid object
 
Thermography:How the heat transfers
 

Emission, reflection and transmission of infrared

 
An object which absorbs infrared well emits infrared well
  Thermography:Emission, reflection and transmission of infrared
 

Principle of measurement by Infrared Thermography equipment

Thermography:Principle of measurement by infrared thermography equipment
 

Image Format of Infrared Thermography

Arrangement of detector and image data of infrared thermography

Arrangement of detector and image data of Infrared Thermography

 

Temperature distribution image data
Temperature distribution image data
Temperature distribution image data of infrared thermography consists of matrix of pixels (number of detector: for example, 320 horizontal X 240 vertical pixels) as shown in the figure above. Thermal image data can be transferred to PC. Subsequently, the data can be calculated and utilized freely. Thermal image data is colored up pixel by pixel based on temperature.

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