In this PPT u will see the principle of pyrometer,its construction,working,applications etc all concepts briefly covered

1. MALAVIYA NATIONAL INSTITUTE OF TECHNOLOGY,JAIPUR
DEPARTMENT OF CHEMICAL ENGINEERING
PRESENTATION|PYROMETER
By:- Pushpinder Goyal
chemical engineering ,MNIT Jaipur
2016uch1640

2. What is pyrometer
Working
Types of
pyrometer
Advantages&Disad
vantages
Referances

3. A pyrometer is a type of remote-sensing thermometer used to
measure the temperature of a surface. Various forms of
pyrometers have historically existed. In the modern usage, it is a
device that from a distance determines the temperature of a
surface from the spectrum of the thermal radiation it emits, a
process known as pyrometry and sometimes radiometry.
Pyrometer a device capable of measuring the
temperature of an object by its incandescence, visible light
emitted by a body which is at least red-hot. Modern pyrometers
or infrared thermometers also measure the temperature of
cooler objects, down to room temperature, by detecting their
infrared radiation flux.

4. A pyrometer is typically made up of an optical system and a
detector. The optical system (a lens) is used to focus the
infrared (IR) energy naturally emitted by an object onto a
sensor or detector. This sensor is responsive to the infrared
radiation and hence transforms IR energy into electrical
energy. The electrical output signal of the detector can be
displayed in terms of temperature. To do this, standard
ambient temperature need to be considered. Emittivity of
an object plays a significant role in conversion of the
electrical signal into a correct temperature signal.
The output signal of the detector (temperature T)
is related to the thermal radiation or irradiance j * of the
target object through the Stefan–Boltzmann law, the
constant of proportionality σ, called the Stefan-Boltzmann
constant and the emissivity ε of the object.

5. OPTICAL PYROMETER
RADIATION PYROMETER

6. In an optical pyrometer, a brightness comparison
is made to measure the temperature. As a measure of the
reference temperature, a color change with the growth in
temperature is taken. The device compares the brightness
produced by the radiation of the object whose temperature is
to be measured, with that of a reference temperature.
The reference temperature is produced by a lamp
whose brightness can be adjusted till its intensity becomes
equal to the brightness of the source object. For an object, its
light intensity always depends on the temperature of the
object, whatever may be its wavelength. After adjusting the
temperature, the current passing through it is measured using
a multimeter, as its value will be proportional to the
temperature of the source when calibrated

8. The main theory behind a radiation pyrometer
is that the temperature is measured through the
naturally emitted heat radiation by the body. This
heat is known to be a function of its temperature.
According to the application of the device, the way in
which the heat is measured can be summarized into
two:
1.Total Radiation Pyrometer – In this method, the
total heat emitted from the hot source is measured at
all wavelengths.
2.Selective Radiation Pyrometer – In this method,
the heat radiated from the hot source is measured at
a given wavelength.

10. ADVANTAGES
1.Simple assembling
2. Provides a very high
accuracy with +/-5 degree
Celsius
3. no need of any direct
body contact
4. The device
can measure very high
temperatures
5. It can also be used to
see the heat produced by
the object/source
DISADVANTAGES
1.Not useful for obtaining
continuous values of
temperatures
2 Only useful for measuring
very high temprature
3. Higher cost as compared
to conventional
thermocouples
4. Advanced radiation
thermometers involve extra
complicated design and
optics.

11. 1. In the blast furnace & metallurgical furnace
2. To measure the steam temperature
3. To measure the moving objects
4. The application is used in smelter industry, over the
bath pyrometer, steam boiler, hot air balloons and
gas turbine engine.
5. for measuring the temperature through the Tuyere

12. 1.http://www.instrumentationtoday.com/optical-
pyrometer/2011/08/
2.http://www.instrumentationtoday.com/radiation-
pyrometer/2011/08/
3.http://automationwiki.com/index.php/Pyrometers
https://en.wikipedia.org/wiki/Pyrometer
4. Michalski et al., “Temperature Measurement, Second
Edition.(Wiley, 2001), pp. 403-404.
5.http://www.omega.com/literature/transactions/volume1/thermo
meters1.html