Optical pyrometry involves different methods of determining the temperature of the controlled object (subject). Fundamentally measuring devices can be divided into three categories:
- Brightness pyrometer;
- Color device;
- Radiation device BALTECH TL.
compared to the last two types of pyrometers, the device of the first type are characterized by a high measurement accuracy. So we consider the brightness pyrometer. The principle of optical (the second name) of the device based on a visual comparison of the estimates. The surface temperature of the object (subject) is evaluated visually. The brightness of its light is compared with a variable reference monochromatic light. The filament of the incandescent lamp is on the background image of the monitored object (the object).
to prevent the influence of the rest of the spectrum, the device is equipped with a red filter that transmits waves of a certain length. The user looking through the eyepiece, use the rheostat to change the brightness (intensity filament). If the thread becomes invisible (disappearing filament), this means that the temperature of the Etalon is equal to the temperature of the object.
If you want to increase the limit of measurement, apply neutral-density filters. They are able to absorb wave optical spectrum. For example, an optical pyrometer is equipped with a red filter, can measure temperature only up to 1400 degrees. If you equip the device with a neutral filter, this indicator will rise by more than 4 times (up to 6000 degrees).
Graduations of brightness pyrometer and is performed by radiation of an absolute blackbody (a blackbody). The emissivity is taken equal to unity or 100%. A similar instrument for the International practical temperature scale are used as the main interpolation devices. The temperature can be above 1064 degrees Celsius.
In the end, we note that brightness pyrometer shows the high accuracy of the measurement if emissivity of a surface of the object (object) and has a high stability. These requirements meet the surface of many non-metallic materials. Therefore, for measuring the temperatures of such materials brightness pyrometer is the perfect instrument.
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