| 摘要 |
PURPOSE:To measure the average value of the flow velocity extending the entire area of a flow tube by fitting a couple of annular vibrators of which the diameters of hollow parts are almost the same as the inside diameter of flow tube at a proper interval via acoustic insulator. CONSTITUTION:The annular vibrators 2, 2' are fitted to the flow tube 1 at a proper interval via the acoustic insulators 4, 4' so that the respective central axes coincide with the central axis 1a of the flow tube 1. Further, with the annular vibrators 2, 2'. the hollow parts are almost the same size as the inside diamter of the flow tube 1 and the annular parts have the width over the wall thickness of the flow tube 1 respectively. Then, when an electrical signal is applied to these annular vibrators 2, 2', an ultrasonic signal is sent out in the direction of the central axis extending the entire flow tube taking the central axis 1a of the flow tube 1 as an axis of symmetry. |
