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Willliamson Ratio Pyrometer Technology

Ratio pyrometers are different from single-wavelength pyrometers in that they measure infrared energy at two wavelengths instead of one. The ratio of energy between the two measured wavelengths is then converted into a temperature value. This method of measurement allows ratio pyrometers to compensate for emissivity variation, partially filled fields of view and optical obstructions.

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Popular Ratio Pyrometer Applications

Steel Mills
Casting, Forming, Joining, and Heat Treating of Metals
Induction, Resistance, Friction, Flame, and Laser Heating
Forging Plants: Billet, Die, Heat Treat
Wire, Rod, and Bar Mills
Rotary Kilns, Thermal Reactors, and Solid Fuel Power Boilers
Engineered Materials: Silicon Crystals, CVD Diamonds, Carbon Densification, High Temperature Ceramics

Two-Color Pyrometers

Dual-Wavelength Pyrometers

General purpose wavelength set
Compensate for variable emissivity and modest optical obstruction or misalignment
Used when there is a clear optical path between the pyrometer and target
Measure temperatures above 1100ºF / 600ºC
Ideal for scale-free and uniformly heated ferrous material

Carefully selected wavelength set
Compensate for variable emissivity, temperature gradient, severe optical obstruction, and misalignment
Wavelength set may be selected to view through water, steam, flames, plasma, etc.
Measure temperatures above 200ºF / 95ºC
Better tolerates scale, temperature gradients, and non-grey interference (20x smaller errors) due to greater separation between wavelengths.