A method for detecting the wall thickness of a container such as a bottle made of PET, for example, in which the absorption of radiation along a first and a second test path of the measurement radiation is ascertained, whereby the test paths intersect the container at two points of intersection such...http://www.google.co.uk/patents/US7858942?utm_source=gb-gplus-sharePatent US7858942 - Method and device for monitoring wall thickness
