Imager Operational Check Prior to Inspections
Many infrared applications standards require that infrared test equipment be within calibration prior to the conduct of an inspection. Although performing a full calibration on a daily basis is impractical, performing some simple operational checks can help to ensure that equipment is functioning properly.
Prior to commencing an infrared inspection, a thermographer should set up his/her equipment by:
- Checking imager optics for cleanliness
- Ensuring that batteries are fully charged
- Inspecting power and video cables/connectors for electrical integrity
- Allowing imager to stabilize with ambient temperature
After completing the above, power-up the thermal imager and note that the imager initializes properly. Once the imager has initialized, adjust imager controls to normal temperature range. Focusing on a high emittance target such as a tabletop or a wall covered with latex paint, check the monitor for image clarity. If the image has inexplicably hot or cold pixels, perform a non-uniformity correction.
Once the image appears clear, a small Delta T can be created by placing one’s hand on one of the above high E surfaces for a few seconds. After removing the hand, image this same area and note the thermal pattern and its intensity. With a properly operating thermal imager, the thermal pattern of the hand should be clearly visible and last for at least one minute.
For more information on thermographer training and certification, contact Infraspection Institute at 609-239-4788 or visit us online at www.infraspection.com.
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