| 摘要 |
<p>PURPOSE:To enable detection of a foreign matter existing on the inner surface of an object to be inspected as infrared image, by heating or cooling the object being inspected from the inner surface thereof to take the outer surface thereof with an infrared camera. CONSTITUTION:An infrared camera head 3 of an infrared video device 2 is directed to the outer surface of a piping 1 as object to be measured from one way. A heating fluid 4 is passed rapidly through the piping 1 to heat it from the inner surface thereof quickly. Then, the quick heating is stopped to take the outer surface of the piping 1 with the camera head 3 immediately after the quick heating or the outer surface thereof is taken with the camera head 3 quickly heating it. Less of heat applied by a heating fluid 4 is transmitted to the outer surface of the pipe at a portion 1b of the pipe wall with a foreign manner 5 on the inner surface thereof than at a portion 1a of the pipe wall without the foreign matter 5 thereon and the existence of the foreign matter 5 on the inner surface thereof appears as temperature difference. This enables projection of the foreign matter 5 in the inner surface of the piping 1 on a monitor TV 6 or the like provided on the body of the infrared video device 2 as infrared image by photographing the outer surface of the piping 1 with the infrared camera head 3 immediately after the quick heating.</p> |
