Method for producing a strain gauge device
AssigneesSTBL Medical Research AG, EMPA Swiss Federal Laboratories for Materials Science and Technology
InventorsMark Melnykowycz, Frank Clemens
Life of this patent
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Abstract
The method for producing the strain gauge device (10) comprises a first stop of producing the band (12). The band (12) has flexibility at least in the measuring zone (36). Then a sensor (22) comprising at least one measuring strand (30) and changing electrical resistivity in dependence of the strain is produced and arranged on or in the band (12) without pre-tension. Afterwards the shape of the band (12) is changed into a retaining working shape and thereby the measuring strand (30) is stretched to an amount of pre-tension.
Claims34
A method for producing a strain gauge device (10), said method comprising the steps of:
- producing a band (12) having an upper side (14), an underside (16), defining a tensioning direction (L) running in the longitudinal direction of the band (12) and having flexibility in a measuring zone (36),
- producing a sensor (22) comprising at least one elongate measuring strand (30) changing electrical resistivity in dependence of the strain and arranging the sensor (22) without pre-tension at or in the band such that the measuring strand (30) runs at least almost in the tensioning direction from one end to the other end of the measuring zone (36),
- changing the shape of the band (12) at least in the measuring zone (36) into a retaining working shape (58);
- and
- stretching the measuring strand (30) to an amount of pre-tension, whereat the amount of pre-tension defines a lower limit of a working range of the sensor (22).
Dependencies are inferred from the claim text.