Multi-focus function is a unique solution to overcome "depth of filed" issue, which is essential for correct temperature
measurement by thermography when the space between thermography camera and target object is limited, or objects are
located distantly even though they are within angle of single thermal image. This paper describes about the multi-focus
function, a new way of image fusion, as well as about typical applications of the function.
Visible image mixing function, or image fusion, is the way of combining color thermal image and black and white visible by thermography camera. The visible image mixing function allows you to pinpoint location of hot spot or cold spot on the object. The mixed data are gathered from wide variety of application including R&D, PPM and process monitoring.
Bridge is indispensable as social overhead capital. In the past, concrete construction was believed to be semi-permanent. Actually, however, concrete is deteriorated by various factors including seawater damage, annual temperature change, etc. Therefore, it is now obvious that maintenance and management are essential to keep performance of the bridge. In Japan, we had many reports of using infrared thermography for diagnosis of building, mainly for delamination of tile and mortar used for surface of the building for more than 10 years. In recent years, infrared thermogrephy is more actively used for delamination of surface of the bridge. Passive method is usually used for open-air concrete structure diagnosis, which utilizes intraday environmental temperature change and/or radiation energy emitted from the sun which create delta-T of delamination portion of the concrete structure. It is very important to take thermal image at right conditions. Otherwise, you may easily fall onto false diagnosis. In our presentation, many case examples and study of thermal data will be shown, which are taken at the right condition.
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