Abstract: Whereas laser doppler vibrometry is used widely in technical fields, their application for clinical diagnosis seems to be limited. Although several technical problems could be solved and the reproducibility of the technique appears to be high enough, the individual variations of the recorded signals between different persons is quite large. The complexity of the motions of the middle ear bones with frequency dependent superpositions of translational and rotational modes is seen as chance for a yield of information about middle ear diseases. A new concept is presented which relays on tow laser beams guided under different angle onto the same spot on the tympanic membrane to determine between the different kinds of motions. The theoretical and basis and first experimental test are described to evaluate the reliability of this concept. !9
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