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Th. Becker, M. Kluge, M. Schneider, U. Schmid, A. Bittner:
"Apparatus And Method For Acquiring Mechanical Loads On Thrust Elements";
Patent: DE, No. Wo 2011/161061 A1; submitted: 06-23-2010, granted: 06-20-2011.

A device for acquiring mechanical Ioads on mechanically loaded bodies exhibits a resonance-
capable micro-bridge structure (16), an alternating valtage source (22) with a variable frequency,
an impedance measuring device (18) for acquiring the impedance ofthe micro-bridge structure (16) and
an electronic unit (20) for receiving determined impedance values and changing the frequency of the
alternating valtage source (22). By exciting the micro- bridge structure (16) and measuring its
impedance, a conclusion can be drawn as to the expansion- dependent resonance frequency, which in
return makes it possible to determine the expansion, and hence the mechanicalload. Such a device is sufficiently
accurate, and largely independent of outside influences.