Sometimes it is difficult to visually inspect cavities behind the concrete lining of tunnels and for corrosion at the ends of bridge girders. However, it is possible to insert an industrial fiber camera through a crack to check the situation.
An industrial borescope is a cable with an outter diameter of as small as φ6.9mm and attached camera, allowing it to be inserted into narrow cracks and holes for inspection. The cable can be up to 3m long, and the tip of the camera is hand operated and can be rotated 360°.
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