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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 pyrometer technology to compensate for emissivity variation, partially filled fields of view and optical obstructions.
There are two types of ratio pyrometer technologies, and Williamson is the only company to offer both. Two-Color technology uses a sandwich detector and a fixed set of wavelengths. Dual-Wavelength technology uses a single detector with two unique and selectable wavelengths, which allows for all of the benefits of a Two-Color pyrometer plus some other significant added capabilitiesTwo-Color pyrometers are ratio pyrometers that can compensate for emissivity and misalignment. However, TC pyrometers cannot view through common optical interferences, so it is critical to avoid water, steam, flames, combustion gasses, plasma and laser energy for the most accurate and repeatable results. Anytime these interferences are encountered, the TC technology will read in error.
