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H. Schweinzer, G. Kaniak, J. Kellner:
"Advanced Measurement Methods of Geometric Object Properties Using Airborne Ultrasound";
Key Engineering Materials, vol. 381-382 (2008), 395 - 398.

Using phase information of ultrasound transducers outside the main lobe of the radiation pattern enables new sensor principles and improves measurements of type, position and orientation of reflecting objects significantly. This paper presents new methods to measure geometrical object properties by ultrasound, advanced sensor behavior based on phase information, and new effective sensor principles to overcome weaknesses of standard sensors.

Airborne Ultrasound Sensors, Angle Measurement of Reflected Echo, Scene Analysis