Ultrasonic test system for sheets of varying width conveyed lying flat on a roller conveyor

摘要

The test system has test heads (7) which can be adjusted towards the sheet, are provided in a plurality of rows (5, 6) extending transversely to the conveying direction (4) and arranged one behind the other with an overlap and each have a transmitter and a receiver. Each test head (7) is equipped with a device for applying a film of water between each test head (7) and the sheet (3). The test heads (7) within each row (5 and 6 respectively) are arranged in such a way that they can be moved or adjusted transversely to the conveying direction (4) to give a particular spacing (a), the spacing between each test head being the same. A device for measuring the strip width is provided. An integral number of test heads (7, 7', 7'') of one row (5) is set in accordance with the sheet width measured between the longitudinal edges (14 and 15) of the sheet (3) in such a way that two test heads (7', 7'') of this row (5) are adjusted towards the sheet (3) adjacent to the edge. <IMAGE>