If you have not heard about this device, then it is simply a device used in recording the temperatures of different objects. It works by tracking and measuring the resultant heat emitted by the object subject. Thermal heat released from the object enters the object system fitted inside the pyrometer where the optical instrument focuses the thermal radiation and then forwards it to the detector. The output temperature from the detector is then compared to thermal radiation that entered through the device to give the accurate temperature. One major advantage of this gadget is that no object contact between the pyrometer and the subject-object unlike in the case of Thermocouple and Resistance Temperature Detector.
The Optical Pyrometer
This is a temperature measuring device that is also a non-contact type. The difference of optical Pyrometer from the regular Pyrometer is that it operates on the principle of matching the brightness observed on the subject object to the brightness that reaches the filament that is placed inside the Pyrometer. The optical Pyrometer has many applications as it is used in measuring temperatures of different objects such as molten metals, furnaces, and any other overheated materials or liquids. The advantage of optical Pyrometer is that it records the temperatures of overheated bodies something which can’t be achieved by the use of contact Pyrometer as it might get damaged or even melt on molten metals.
When measuring temperature using the instrument, the brightness comparison is the main feature where there is a color change detected with the increase of the temperature of the object which its temperature is to be recorded. The instrument compares brightness released by the radiation effect from the subject-object to that brightness released as the reference. This ref temperature is released by a filament lamp in which its brightness can be regulated un
til its intensity equals the temperature of the subject object is to be recorded. The light intensity of an object always depends on the temperature of that object no matter the wavelength. This provides the principle which is used to record the temperature. The temperature is adjusted until it levels up and the current that passes through is recorded using the multimeter considering its value is directly relates to that origin temperature of the source object where it is then calibrated to give the accurate results.
Constructing an Optical Pyrometer
It is a simple device to construct where the Pyrometer is in a cylindrical shape. The lens is placed on one end and the eyepiece at the other end. The lamp is then placed between the lens and the eyepiece. A filter is then placed in front of the eyepiece which helps in obtaining monochromatic light. The filament is then connected to the ammeter, a rheostat, and a battery.
How Optical Pyrometer works
The working is simple where the lens focuses radiated energy from the subject-object onto the electric filament. The intensity of the filament will depend on the current that passes through where the adjustable current passes through the lamp and the intensity recorded to give accurate temperatures after calibration.
Components of radiation to pyrometer
The Pros of Optical Pyrometer
The instrument gives accurate measurements.
No body contact when measuring the temperatures which enable the instrument to be used in various applications.
The Cons of Optical Pyrometer
The working of the instrument depends on the emitted temperatures from the subject body thus only used to take temperature measurements above 700 degrees Celcius
Can’t be used in measuring clean glass temperatures.
from Maize Stove http://www.maizestove.com/all-that-you-need-to-know-about-optical-pyrometer/
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