Method and apparatus for sensing fluid interface(s) in a complex fluid such as centrifuged blood, includes a sensing assembly with a microwave source and a microwave sensor positioned in spaced opposed relation, the microwave source and sensor defining a microwave propagation path. Relative motion is...http://www.google.de/patents/US5245292?utm_source=gb-gplus-sharePatent US5245292 - Method and apparatus for sensing a fluid handling
