Principle and Application of Two-color Infrared Pyrometer
A two-color pyrometer operates based on the following principle: at two selected infrared wavelengths with a fixed bandwidth, the ratio of radiant energy between the two wavelengths varies with temperature changes. It adopts two sets of narrow-band monochromatic filters to collect radiant energy from two adjacent spectral bands. The collected energy is converted into electrical signals for comparison, and the temperature of the measured target is ultimately determined by this ratio.
This design largely eliminates the inconvenience caused by adjusting the emissivity of target materials. Two-color pyrometers feature high temperature measurement sensitivity, minimal deviation from the true target temperature, and low susceptibility to measuring distance and intervening absorptive substances, delivering excellent performance in medium and high-temperature measurement scenarios.
Characteristics and Performance of Two-Color Pyrometers
Effectively eliminates the influence of the target emissivity on temperature measurement results.
Measurements remain largely unaffected by small targets that do not fill the field of view, as well as smoke, dust and other contaminants along the measuring path.
Designed primarily for medium and high-temperature working conditions.
High measurement accuracy, fast response speed and high distance-to-spot ratio.
Applications of Two-Color Infrared Pyrometers
Two-color infrared pyrometers are ideal for high-temperature measurement scenarios where emissivity is difficult to define, targets are too small to fill the field of view, or radiant energy attenuation occurs along the measuring path - challenges that single-color pyrometers struggle to address effectively.
They have a wide range of application fields, especially widely used in the iron and steel industry, metal heat treatment, metal processing, casting and other industries.
Two-color infrared pyrometers serve as the optimal solution under the following conditions:(1) Radiant energy attenuation caused by dust, smoke and particles in the environment;(2) Contaminated observation windows or instrument lenses;(3) Partial obstruction or shielding of the instrument on-site;(4) Tiny targets that cannot fill the instrument's field of view;(5) Targets in motion or under vibration;(6) Curved, narrow or blocked measuring channels;(7) Temperature measurement of molten metals.
Typical applications:Molten steel, molten iron, molten copper, molten aluminum, steel processing, wire processing, filament production, glass industry, induction welding, metal heat treatment, casting, furnace and kiln operation, induction heating, pipeline annealing and more.
