Dual-Wavelength Temperature Sensor


Dual-Wavelength Temperature Sensor

Dual wavelength sensors tend to measure the hottest temperature viewed in the target area which enables them to compensate for adverse application conditions.  This includes applications with varying emissivity, intervening media, and small or wandering targets.  With a unique single detector design and the industry’s highest signal dilution factor, Williamson’s dual wavelength sensors can outperform all other ratio sensors when these adverse conditions exist.

  • Materials such as ferrous metals which have low and varying emissivity values
  • Intervening media such as dirty optics, scale, steam, dust, or water spray
  • A partially filled field-of-view caused by a mechanical obstruction or a small wandering target


  • Temperature limits of 200-4500°F (95-2500°C)
  • Accurate, reliable, repeatable measurements
  • Wide Selection of temperature ranges and optics
  • Measures target temperature, signal strength (emissivity), signal dilution, and ambient temperature
  • Visual, laser, and fiber optic alignment options


These dual wavelength IR sensors can be used for temperature monitoring or process control with applications in challenging and harsh operating environments. They are ideal for applications involving low or varying emissivity materials, intervening media, and or partial filled field of views.  Typical applications include:

  • Ferrous Metals
  • Induction Heating
  • Vacuum Chambers
  • Glass Molds
  • Rotary Kilns
  • Molten Metal
  • Small Wires
  • Welded Tubes