Infrared thermography is based on measuring the distribution of radiant thermal energy (heat) emitted from a target surface and converting this to a surface temperature map or thermogram. Thermal energy is present with the operation of all machines. It can be in the form of friction losses within machines, energy losses within machines, as a characteristic of the process media or any combination thereof. As a result, temperature can be a key parameter for monitoring the performance of machines, the condition of machines and the diagnostics of machine problems. Temperature is also one of the key causes and symptoms of lubricant degradation and loss of lubrication function within a machine.
Infrared thermography is an ideal technology to investigate thermal anomalies on machines because it offers complete thermal images of a machine or a machine component with no physical attachments (non-intrusive), requires little setup and provides the results in a very short period of time. As such, thermography techniques can be used as part of a condition monitoring process when such a process is implemented in accordance with ISO 17359.
Thermography Techniques
There are several recognized infrared thermography techniques in use throughout industry. Comparative thermography is the most common technique, and it is normally used to provide the best available data in lieu of ideal or absolute thermal measurements. When encountering changing machinery operating conditions, the ability to perform rough emissivity estimates and to differentiate emissivity differences on machinery equipment provides useful information for condition monitoring and diagnostics of the machine under the less-than-ideal circumstances frequently encountered in the field. Absolute thermography is used when it is essential to know as precisely as possible the true temperature of a target.See more at: http://www.reliableplant.com/Read/28638/using-thermography
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