PRINCIPLES OF INSPECTION TECHNIQUE

The use of Infra-red imaging technique to detect building defects is a well proven technique that has been in use for a number of years in the world. It is based on the principle that any moisture trapped within the fabric of a building will cause a differential temperature relative to the surrounding concrete this will affect the amount of thermal radiation causing a variation in the thermal response and transmittance of that building.

Thus, as the temperature of a building surface varies due to the effect of the variation in the surface radiation, the differential rates of thermal transmittance will have the effect of causing surface temperature differentials to occur between the dry and wet areas.

Although this temperature differential due to radiation remittance is very small, it is possible to detect it using an extremely sensitive thermal imaging system on which the calibration has been optimized for the temperature band encountered.  Water is a poor conductor of heat relative to concrete, brickwork or stone, which enables its easy detection even in very small quantities within the fabric of the building either internally or externally.

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All rights reserved. 上次修改日期：2010年09月11日。