Training, experience and practice will give the infrared analyst a better understanding of camera functions and settings.

In order to obtain accurate images for analysis in infrared inspection, first priority should be basic camera settings prior to and during inspection of any asset. Issues such as emissivity, correct level, span, focus and perspective should also be considered. Essentially, if the camera does not have the proper settings and adjustments, any infrared image taken, could be an inaccurate assessment and provide you with false data.

Emissivity can be adjusted prior to inspection with an emissivity chart or by calculation. A basic emissivity setting of .98 to 1.00 is usually a good starting point for most inspections. More accurate adjustments can be made, if required. A general calibration check can be performed by checking a persons tear duct for a temperature between 92 and 95 degrees Fahrenheit.

At site of inspection, environmental specific settings can be adjusted. These may include, ambient temperature, atmospheric temperature, distance to target and relative humidity. Level, span and focus can be adjusted during inspection.

Michael J. Wedge
ASNT 2 Thermography
ASNT 1 Airborne Ultrasound
Motor Circuit Analysis 1
The Snell Group
Dayton, Ohio 45414

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