Infrared Thermography

Different objects emit varying levels of infrared radiation—i.e., heat. By employing infrared thermography, operators can detect these normally invisible radiation levels and create a visual representation of the heat distribution. The infrared thermography technology allows system operators and technicians to verify normal operation or locate abnormal heat patterns and other anomalies within machines and systems. The advantage of this technology is that it provides users with the capacity to detect system issues and correct them before they cause extensive system damage or production shutdowns.

While operating infrared imaging technology is relatively simple, interpreting the visual information collected by the systems is more complex and challenging. With proper training and experience, asset managers and maintenance personnel can utilize the data provided by infrared cameras to make improvements to the system maintenance, monitor system performance, and enhance production quality. 

When using infrared thermography on mechanical equipment (such as motors and rotating equipment), certain conditions are required. Operators—referred to as thermographers—must have a solid understanding of basic radiometry and heat transfer principles, familiarity with the equipment’s operational parameters, and substantial knowledge of the capabilities and limitations of infrared cameras. Most of these inspections focus on comparing the overall thermal patterns to establish the health of the overall system, rather than emphasizing absolute temperature measurements. 

Unexpected system damage and failure significantly impact the productivity of a facility by imposing production shutdowns, as well increases the costs of operation, maintenance, and total equipment investment. Preventing these issues requires predictive maintenance procedures, such as employing infrared thermography, to proactively detect potential system issues. Some of the applications where thermal imaging accomplishes this objective include: 

• Bearing inspection. The rise in the surface temperature of a bearing, detected through a change in its thermal signature, might point to abnormal friction from under or over lubrication, poor maintenance or a bad bearing.
• Low speed equipment inspection. Employing infrared thermography facilitates the inspection of low speed equipment, including overhead conveyors or idlers.
• High temperature refractory insulation monitoring. Thermal imaging allows operators to monitor the condition of internal motor components such as refractory insulation, as well as calculate the remaining refractory thickness.