System for Manufacturing an Irrigation Pipe and a Device and Method for Detecting Holes in the Wall of an Irrigation Pipe

A device for detecting holes in the wall of an irrigation pipe comprising

• at least one optical transmitter and at least one optical receiver which define an optical barrier
• said device being arranged so that holes in an irrigation pipe being located below said device producing gas bubbles which modify said optical barrier
• said device being arranged for allowing total immersion of an irrigation pipe in a cooling liquid.

A method for detecting holes in a wall of an irrigation pipe comprising

• defining an optical barrier by using at least one optical transmitter and at least one optical receiver, a first cable connected to said at least one optical transmitter, and a second cable connected to said at least one optical receiver, each of said first and second cables comprising one optical fiber or a beam of N optical fibers,
• said optical transmitter, said optical receiver, said first cable and said second cable being arranged for being immersed in a cooling liquid
• detecting a modification of said optical barrier caused by gas bubbles raising from said holes in a wall of said irrigation pipe.