Raytek has expanded its Marathon series two-colour infrared temperature measurement capability with the addition of the full Ircon range since the acquisition.
How colour ratio pyrometers work
In standard (one-colour) infrared thermometry, the instrument captures some of the infrared (IR) energy that is emitted by an object. From this the temperature of the object can be by proportionality and the amount of energy emitted by an ideal radiator at the same temperature.
In contrast to one-colour IR thermometers, ratio (two-colour) instruments pass the captured IR energy through two filters that split the radiation into discrete wavelengths. The two spectral frequencies are then directed to separate detectors where they are converted to electrical signals; the instruments microprocessor determines the ratio, and this is proportional to the temperature of the object.
A range of accessories to protect the thermometer from harsh environments is available as options
Ratio thermometers will tolerate up to a 95% reduction of energy due to obscuration or attenuation and still remain accurate. So if users can see only 5% of the object due to dust or smoke they can still obtain an accurate reading. A standard instrument measuring the same object with the same percent of energy attenuation will produce a 30% error in the temperature reading.
Areas of application
Because ratio thermometers are less affected by obscuration and energy attenuation than standard instruments, they are ideal for use in many applications where a standard instrument cannot provide an accurate temperature measurement.
The following are the most common conditions where a ratio thermometer is the best solution:
* Energy reaching the instrument is reduced because of dust, smoke, steam, or particles in the atmosphere.
* The sighting optics are dirty.
* The instrument’s field-of-view is partially blocked or obscured.
* The target does not fill the instrument’s field-of-view.
* The target is smaller than the instrument’s field-of-view and is moving or vibrating.
* Changes in object emissivity due to slag or scale.
Most ratio thermometers are designed for use in high temperature applications. A typical temperature range for a ratio instrument is 600 to 3000°C, with response times as fast as 10 ms.
The Raytek and Ircon two-colour ratio units have the ability to switch between single and two-colour allowing users to select the best mode for the application.
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