Contactless leak test using pulses

Abstract

The invention relates to a leak test for filled and closed plastic bottles (), wherein the plastic bottles () are led past a testing device () in a positionally stable manner, wherein the testing device () comprises an (optoelectric) detection system () and a pressure medium system (), wherein the detection system () and at least one controllable valve () of the pressure medium system () are connected to an evaluation and control unit (), wherein at least one or more pressure medium pulses having variable durations or a duration of 1 ms to 6 ms are generated when the plastic bottle () is led past a nozzle () of the pressure medium system (), wherein each pressure medium pulse applies a punctiform load on a bottle wall region (), wherein at least one light source () or a laser beam of a laser distance sensor () of the detection system () illuminates or irradiates at least the bottle wall region () loaded by the pressure medium pulse at the same time as the pressure medium pulse is generated, wherein a camera () or the laser distance sensor () of the detection system () receives data of the bottle wall region () loaded with the pressure medium pulse and transmits the data to the evaluation and control unit (). The invention provides for contactless pressure control of filled and closed plastic bottles (), having a reduced pressure medium consumption and producing less noise.