Leak detection on a flexible test piece in a film chamber

A method for leak detection on at least one flexible test piece in a film chamber, the method comprising:

• introducing the at least one flexible test piece into a film chamber;
• lowering a pressure in the film chamber outside the at least one flexible test piece;
• detecting a leak in the at least one flexible test piece by monitoring a spatial change of a film of the film chamber;
• transferring an outer contour of the at least one flexible test piece to at least one portion of the film by the lowering of the pressure in the film chamber,
• capturing said outer contour of the film by means of an image capturing device;
• and
• comparing the captured images of the outer contour of the film as produced by the at least one flexible test piece to reference images of the outer contour of the film as produced by tight test pieces,
• wherein a portion of the film captured by the image capturing device is provided with a grid, the position of which is monitored and evaluated.