Strain gauge for a measurement variable sensor
A strain gauge and receiver technology, applied in the field of strain gauges, can solve the problems of reduced reproducibility, measurement error, measurement signal change, etc., and achieve the effect of improving measurement accuracy
Inactive Publication Date: 2009-07-15
HOTTINGER BALDWIN MESSTECHNIK GMBH
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Problems solved by technology
[0007] Due to the small ratio of deflection point length and width to measuring grid width, this measuring error is difficult to reduce with high reproducibility, especially when compensating for large positive measuring body creep
Because the carrier film of the strain gauge is exposed to large shear stress peaks at the deflection point when compensating for relatively large measuring body creep and this can lead to a large spread in the time- and temperature-dependent creep and thus in the strain gauge receiver Causes the measurement signal to change in
Since the turning point is also part of the strain gauge resistance being measured, changes in the sheet resistance due to relaxation due to large shear stresses in the area of the turning point lead to changes in the measured resistance and thus to measurement errors
Method used
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[0023] figure 1 A curve τ of the shear stress with the turning point and the dependent i and elongation curve ε i Part of a meander-shaped measuring grid of a thin-film strain gauge, wherein the deflection point 4 consists of a horizontal bar 6 at the end of the measuring grid bar 5 and two longitudinal bars 7 with rectangular anchor surfaces 8 .
[0024] The shown part of the strain gauge proceeds from a film strain gauge of the type mentioned at the outset, which preferably comprises a plastic carrier film (not shown), on which a meander-shaped coil of resistive material is applied. Measuring grid 1. This type of strain gauge usually has a length of 3 to 6 mm and is attached to the measuring spring body, which is a measuring volume receiver. The strain gauge, partially shown, preferably has a resistance of 120 ohms or 350 ohms and contains measuring grid bars 5 with a width of approximately 30 to 50 microns at a bar length C of, for example, 4 mm.
[0025] The deflection...
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Abstract
The invention relates to a strain gauge for a measurement variable sensor, comprising a meandering measurement grid (1) that is arranged on a film-type carrier layer. Said measurement grid (1) comprises measurement grid struts (5) on whose end areas, return points (4) comprising a transversal strut (6) are arranged for connection to the adjacent measurement grid strut (5) which runs in parallel. Said invention is characterised in that each return point (4) consists of a narrow transversal strut (6) and two longitudinal struts (7) as an extension of the measurement grid struts (5). The narrow transversal strut (6) is arranged on the end point of the measurement grid struts (5) and on the initial point of the longitudinal strut (7). The longitudinal struts (7) are open towards the exterior.
Description
technical field [0001] The invention relates to a strain gauge for a measuring volume receiver. Background technique [0002] New developments or further developments of materials and their processing methods can significantly increase the performance with regard to the requirements for the production of measuring springs for weighing cells and force receivers. The main requirement here is a reproducible, time-constant behavior of the deformation body and of the strain gauges attached thereto. Here, the use of materials with minimal self-creep and reproducible properties is a prerequisite for constructing a good receiver. [0003] In practice every measuring spring material has a more or less large positive self-creep under mechanical load. Under this load, the elongation of the measuring spring material is transmitted to the attached strain gauge, which consists of a meander-shaped measuring grid made of metal foil arranged on the carrier layer. Strain gauges also have s...
Claims
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Patent Timeline
Login to View More IPC IPC(8): G01L1/22
CPCG01B7/18G01L1/2287
Inventor M·克罗伊策
Owner HOTTINGER BALDWIN MESSTECHNIK GMBH