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Presentation
 Submitted To: Dr. Fiaz Ahmad
 Submitted By: Hamza Salahudin
 Roll No: 38
 Session: 2014-2018
 Semester: 5th
11.9
OPTICAL
PYROMETER
Contents
 Introduction
 Principle
 Types
 Working principle
 Advantages
 Disadvantages
 Applications
What is
Pyrometer ?????
A PYROMETER IS A TYPE OF THERMOMETER USED
TO MEASURE HIGH TEMPERATURES. IT IS USED FOR MEASURING
TEMPERATURE WITHOUT ANY PHYSICAL CONTACT. ITS IS USED
FOR MEASURING BODY TEMPERATURE BY MEASURING ITS
ELECTROMAGNETIC RADIATION.
Principle of Pyrometer
 Its principle depends upon the relationship
between temperature of a hot body and
electromagnetic radiation emitted by the body.
When a body is heated it emits thermal energy
known as heat radiation. It is a technique for
determining a body temperature by measuring its
electromagnetic radiation.
Types of pyrometer
 Radiation Pyrometer
 Optical Pyrometer
 Thermo - Electric Pyrometer
 Photoelectric Pyrometer
Optical Pyrometer
Optical Pyrometer
 The Optical Pyrometer is a highly-developed and
well accepted noncontact temperature
measurement device.
 It is widely employed for accurate measurement
of the temperature of furnaces, molten and other
heated materials.
 It is primarily used in the range of 1000 to 5000 ⁰F.
Working Principle of
Pyrometer
 Optical Pyrometers work on the basic principle of
using the human eye to match the brightness of
the hot object to the brightness of a calibrated
lamp filament inside the instrument.
 The radiation from the source is emitted and the
optical objective lens captures it. The lens helps in
focusing the thermal radiation on to the reference
bulb.
Working Principle of Pyrometer
 The observer watches the process through the
eye piece and corrects it in such a manner that
the reference lamp filament has a sharp focus
and the filament is super-imposed on the
temperature source image.
 The observer starts changing the rheostat values
and the current in the reference lamp changes.
This in turn, changes its intensity.
 This change in current can be observed in three different
ways :
Advantages of Pyrometer
 Simple assembling of the device enables easy use
of it.
 Provides a very high accuracy with +/-5 degree
Celsius
 There is no need of any direct body contact
between the optical pyrometer and the object.
Thus, it can be used in a wide variety of
applications.
Disadvantages Of
Pyrometer
 As the measurement is based on the light
intensity, the device can be used only in
applications with a minimum temperature of 700
degree Celsius.
 The device is not useful for obtaining continuous
values of temperatures at small intervals
Application Of Pyrometer
 Used to measure temperatures of liquid metals or
highly heated materials.
 Can be used to measure furnace temperatures.
Optical pyrometer

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Optical pyrometer

  • 1.
  • 2. Presentation  Submitted To: Dr. Fiaz Ahmad  Submitted By: Hamza Salahudin  Roll No: 38  Session: 2014-2018  Semester: 5th
  • 4. Contents  Introduction  Principle  Types  Working principle  Advantages  Disadvantages  Applications
  • 5. What is Pyrometer ????? A PYROMETER IS A TYPE OF THERMOMETER USED TO MEASURE HIGH TEMPERATURES. IT IS USED FOR MEASURING TEMPERATURE WITHOUT ANY PHYSICAL CONTACT. ITS IS USED FOR MEASURING BODY TEMPERATURE BY MEASURING ITS ELECTROMAGNETIC RADIATION.
  • 6. Principle of Pyrometer  Its principle depends upon the relationship between temperature of a hot body and electromagnetic radiation emitted by the body. When a body is heated it emits thermal energy known as heat radiation. It is a technique for determining a body temperature by measuring its electromagnetic radiation.
  • 7. Types of pyrometer  Radiation Pyrometer  Optical Pyrometer  Thermo - Electric Pyrometer  Photoelectric Pyrometer
  • 9. Optical Pyrometer  The Optical Pyrometer is a highly-developed and well accepted noncontact temperature measurement device.  It is widely employed for accurate measurement of the temperature of furnaces, molten and other heated materials.  It is primarily used in the range of 1000 to 5000 ⁰F.
  • 10.
  • 11. Working Principle of Pyrometer  Optical Pyrometers work on the basic principle of using the human eye to match the brightness of the hot object to the brightness of a calibrated lamp filament inside the instrument.  The radiation from the source is emitted and the optical objective lens captures it. The lens helps in focusing the thermal radiation on to the reference bulb.
  • 12. Working Principle of Pyrometer  The observer watches the process through the eye piece and corrects it in such a manner that the reference lamp filament has a sharp focus and the filament is super-imposed on the temperature source image.  The observer starts changing the rheostat values and the current in the reference lamp changes. This in turn, changes its intensity.
  • 13.  This change in current can be observed in three different ways :
  • 14. Advantages of Pyrometer  Simple assembling of the device enables easy use of it.  Provides a very high accuracy with +/-5 degree Celsius  There is no need of any direct body contact between the optical pyrometer and the object. Thus, it can be used in a wide variety of applications.
  • 15. Disadvantages Of Pyrometer  As the measurement is based on the light intensity, the device can be used only in applications with a minimum temperature of 700 degree Celsius.  The device is not useful for obtaining continuous values of temperatures at small intervals
  • 16. Application Of Pyrometer  Used to measure temperatures of liquid metals or highly heated materials.  Can be used to measure furnace temperatures.