| 摘要 |
<p>PURPOSE:To enable detection of an infrared image of a state of existence of a contact piece existing in contact with the internal surface of an object to be inspected, by heating or cooling the object being inspected quickly from the outer surface thereof to take the object with an infrared camera. CONSTITUTION:An infrared camera head 4 of an infrared video device 3 is directed to the outer surface of a packed pipe column 1 as piping to be inspected from one way. Then, the outer surface of the packed pipe column 1 held in a screen of a monitor TV 6 is heated quickly with a heater 7 in a photography range thereof and in the perimeter of the range. Then, immediately after the quick heating, it is taken with the camera head 4 in the photography range heated. As the outer surface of a pipe is deprived of heat from the inner surface side thereof at a portion 1b of the pipe wall with a cavity 8 near the inner surface thereof in contact with a concrete 2 less than at the portion 1a thereof without the cavity 8. A difference in thermal effect appears as temperature difference in the outer surface of the pipe depending on a difference of a packing state - how the concrete 2 contacts the inner surface of the packed pipe column 1. Thus, photographing with the infrared camera head 4 enables projection of the packing state on a monitor TV 6 or the like as infrared image.</p> |
