A - Human Necessities – 61 – B
Patent
A - Human Necessities
61
B
A61B 5/117 (2006.01) G06K 9/00 (2006.01)
Patent
CA 2139568
Abstract The invention relates to a method and an apparatus for determining the authenticity and/or for identifying the respective spatial structure of a test specimen, whereby this test specimen is placed on a surface and is exposed to ultrasonic waves traversing a body contiguous with said surface and the waves reflected and/or backscattered at the test specimen reproduce a difference structure in each case of different test specimens and are evaluated. It is characteristic of the method according to the invention that provided in the body (4) is a layer or surface (6) which is transparent to the ultrasonic waves and reflects and/or diffracts electromagnetic waves, that said layer or surface (6) in the body (4) is deformed in a locally different and time-dependent way by the ultrasonic waves according to the form and intensity of the backscattered or diffracted ultrasonic waves, and that said layer (6) is exposed to radiation of electromagnetic waves at an angle and in the area of the electromagnetic beams reflected and/or diffracted at the angle of emergence (9) the same are intercepted and their change caused caused by their reflection or diffraction at the layer (6) is evaluated. To carry out this method, the apparatus according to the invention is formed in that said layer (6) is arranged in the body (4) and that the apparatus (1) has an electromagnetic radiation source (7), the beams of which are directed to the layer (6), and that at least one beam receiver (8) is provided in the area of the reflected or diffracted electromagnetic beam and serves to evaluate said beam (single Fig.).
Fetherstonhaugh & Co.
Stockburger Hermann
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