Rooftop inspections with infrared thermography detect unseen water damage.
Companies use inspections to identify and diagnose problems as part of their maintenance programs. Preventive maintenance saves money by making repairs before damage that shuts down equipment and production occurs. Infrared thermography inspections utilize images produced by invisible infrared light from thermal sources; the source of the light is the object being inspected. These economical inspections detect unseen problems by utilizing various techniques.
Pulsed Active
Infrared thermography relies upon differences in temperature to produce images. Active techniques refer to the practice of introducing an outside force to create those differences. Pulsed active thermography is an example of this technique; it creates a temporary change in the temperature which can be measured. An example of its use involves the inspection of the insides of pipes for corrosion and other damage that narrows the walls. This technique, known as nondestructive testing, allows the inspector to see the interior without having to damage pipes or walls.
Proximity
It is important to get as close to the object being inspected as possible when using an infrared camera; this means getting as physically close as possible while taking into effect safety concerns. The greater the distance from the object, the more likelihood of an inaccurate reading. Long-distance lenses are used for inspections that preclude close proximity, such as electrical poles. A wide-angle lens is used to inspect large objects.
Weather Adjustments
A variety of weather conditions affect infrared thermography readings; for example, high winds during a roof inspection can obscure the imaging results. Other weather conditions that must be taken into effect include summer sunlight and rain. The inspector must adapt to weather conditions to ensure accurate readings, including avoiding testing during times of rain or waiting for gusts of wind to subside. Avoid testing during times of intense sunlight, such as the middle of the day. Reschedule testing if adjustments to the conditions are not possible.
Equipment Selection
Prior to conducting an infrared thermography inspection the inspector analyzes the job and selects the best equipment unless specific equipment has been requested. Considerations for equipment selection include field of view, color options and physical limitations. Each job has its own set of problems, and the equipment must take those into account. Consideration is also given to accessories like heat shields and special lenses. Proper equipment selection avoids retesting and other delays.
Tags: infrared thermography, weather conditions, being inspected, damage that, detect unseen
