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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| Two-Color Pyrometers | Dual-Wavelength Pyrometers | |
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Single-Wavelength pyrometers are preferred when appropriate due to simpler, lower-cost technology. They are available in Short-Wavelength, Long-Wavelength and Specialty-Wavelength configurations. For most applications, select the shortest wavelenght compatible with the measurement conditions and desired temperature span. Specialty wavelengths may be necessary depending on the optical transmission properties of the target.
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The Williamson Flare Monitor (FM) utilizes proven dual-wavelength technology to monitor the ratio of carbon to available oxygen deep within the hot flare flame. This ratio value correlates to combustion efficiency and is used to adjust the flow of air or steam to smokeless flares, thus assuring smoke-free operation and maximum combustion efficiency.
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Multi-wavelength pyrometers are used to measure the temperature of non-greybody materials. These are materials for which the emissivity not only varies, but varies differently at different wavelengths.
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Williamson Flame Intensity Monitors (FI) are the single-wavelength sensors of choice for a variety of flare applications where the more sophisticated dual-wavelength flare products are not appropriate or are not required.
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