WO2007128504A1 - Jauge de contrainte pour enregistreur de grandeur mesurée - Google Patents

Jauge de contrainte pour enregistreur de grandeur mesurée Download PDF

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Publication number
WO2007128504A1
WO2007128504A1 PCT/EP2007/003932 EP2007003932W WO2007128504A1 WO 2007128504 A1 WO2007128504 A1 WO 2007128504A1 EP 2007003932 W EP2007003932 W EP 2007003932W WO 2007128504 A1 WO2007128504 A1 WO 2007128504A1
Authority
WO
WIPO (PCT)
Prior art keywords
webs
strain gauge
creep
measuring
longitudinal
Prior art date
Application number
PCT/EP2007/003932
Other languages
German (de)
English (en)
Inventor
Manfred Kreuzer
Original Assignee
Hottinger Baldwin Messtechnik Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hottinger Baldwin Messtechnik Gmbh filed Critical Hottinger Baldwin Messtechnik Gmbh
Priority to CN2007800255333A priority Critical patent/CN101484787B/zh
Publication of WO2007128504A1 publication Critical patent/WO2007128504A1/fr

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L1/00—Measuring force or stress, in general
    • G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
    • G01L1/22—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges
    • G01L1/2287—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges constructional details of the strain gauges
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
    • G01B7/16—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge
    • G01B7/18—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge using change in resistance

Definitions

  • the invention relates to a strain gauge for Messgrö- sen sensor according to the preamble of patent claim 1.
  • each spring material has a greater or lesser positive self-creep under mechanical stress.
  • the elongation of the measuring spring material is transferred to the applied strain gauges, which consists of a arranged on a support layer meander-shaped measuring grid made of metal foil.
  • This strain gauge also has its own creep, which has a negative sign under load.
  • the behavior of the spring body and the behavior of the strain gauges are now to be coordinated so that they ideally compensate each other exactly, so that as far as possible a measurement error is avoided.
  • the self-creep of the strain gauge must be matched to the self-creep of the measuring spring material. Ideally, the creep behavior of the
  • Strain gauge have the same time course with the opposite sign, as the creep behavior of the spring material. From EP 0 451 636 A1, a strain gauge with particularly low creep error is known.
  • This strain gauge consists of a foil-like carrier layer, to which a meander-shaped measuring grid made of a resistance foil is glued.
  • the carrier film consists of a specific plastic film, by which in particular a temperature-dependent self-creep behavior of the strain gauge is improved.
  • the Eigenkriech depends not only on the used material of the measuring grid, the carrier and the connecting materials, so that the self-creeping already may have an unfavorable Eigenkriech due to the geometric design of the meandering measuring grid.
  • EP 0 451 636 A1 has in practice a meander-shaped measuring grid with a larger number of measuring grid bars arranged parallel to one another and made of a resistance foil.
  • the resistance foil usually consists of a copper-nickel alloy (Konstantan) or nickel-chromium alloy (Karma) and preferably has a film thickness of approximately 3 to 5 ⁇ m.
  • the entire measuring grid usually has a length of 3 to 6 mm and a web width of 30 to 50 microns, wherein the distance between the webs corresponds approximately to a web width. Therefore, the reversal points at the web ends have a total width of about 3 Meßgitterstegumblen.
  • the length of the reversal points generally corresponds to 2 to 6 times the grid web widths.
  • the entire stretched measuring grid looks similar to a strained Feather.
  • the spring force therefore generates shear stresses in the carrier film and the adhesive layers, in particular in the area of the reversal points.
  • the plastic of the strain gauge and the adhesive relax, ie the counterforce weakens and the measuring grid contracts. This results in a negative creep of the strain gauge, which should be as much as possible the same size as the positive creep of the measuring body, so that the resulting total creep of the Meß distreauitess is zero.
  • the invention is therefore based on the object to improve a strain gauge of the type mentioned so that thus a creep-dependent measurement error of
  • the invention has the advantage of achieving a decoupling of the electrical and mechanical relationships of the creep behavior through the configuration of the reversal points of longitudinal and transverse webs, as a result of which the measurement accuracy of a measurement pickup can be considerably increased.
  • This is preferably effected by the fact that the mechanical adjustment of the negative creep by the lattice-extending longitudinal webs not on the measurement signal acts as its current flows through the thin, largely shear stress-free transverse webs.
  • the invention furthermore has the advantage that the anchor surfaces necessary for proper relaxation can be formed independently of the electrical resistance conditions, so that in particular the shear stress peaks in the reversal point region can be reduced so that the temperature and time-dependent creep behavior can also be advantageously influenced. It can already be necessary for the compensation of the spring body creep by the length of the longitudinal webs
  • the longitudinal direction can still be influenced such that a total of almost any creep behavior of the strain gauge can be set. Due to the shape of the longitudinal webs, the set creep behavior is advantageously subject to only slight variations even with customary production tolerances.
  • the width of the longitudinal webs is narrower than the measuring grid webs.
  • Show it: 1 shows a partial view of a strain gauge with rectangular anchor surfaces at the reversal points and an associated shear stress curve and a strain curve;
  • FIG. 2 shows a partial view of a strain gauge with two measuring webs and a reversal point of two equally wide longitudinal webs.
  • FIG. 3 shows a partial view of a strain gauge with two measuring webs and a reversal point of two narrow longitudinal webs
  • Fig. 4 a partial view of a strain gauge with two measuring grid webs and a reversal point of two narrow longitudinal webs and two rounded wide anchor surfaces.
  • Fig. 1 of the drawing is a part of a meandering measuring grid of a FoliendehnungsmessstMakes
  • the reversal points 4 consist of a transverse web 6 at the ends of the measuring grid webs 5 and two longitudinal webs 7 with rectangular anchor surfaces 8.
  • the illustrated part of the strain gauge is based on a film strain gauge of the type mentioned above, which preferably contains a plastic carrier film, not shown, on which a meandering measuring grid 1 is applied from an electrical resistance material.
  • a strain gauge usually has a length of 3 to 6 mm and is applied to a measuring spring body and represents a Meßdorfnaufillon.
  • the partially shown Strain gauge preferably has an electrical resistance of 120 or 350 ⁇ and contains Meßgitterstege 5, whose width is about 30 to 50 microns at a web length c of eg 4 mm.
  • the reversal points 4 include a narrow transverse web 6, which connects the two ends of two adjacent parallel measuring grid webs 5 together electrically.
  • the narrow cross bar 6 has the same or a smaller width as the measuring grid webs 5.
  • Extension of the measuring grid webs 5 contains the reversal point 4 in the outwardly directed region to the transverse web 6 two longitudinal webs 7, which also preferably extend parallel to each other.
  • the longitudinal webs 7 are formed following the measuring grid webs 5 in a predetermined length b in the same width as the Meßgitterstege 5 and contain at their end portions on a section length a rectangular broadening, which represents a rectangular anchor surface 8 of the longitudinal webs 7.
  • the section b has, for example, the length of about 130 microns and the
  • Section a has a length of about 100 microns, wherein the widened anchor surface 8 preferably has a width of about 100 microns. Since such a strain gauge for measuring variable is connected to a predetermined supply voltage, there is an electrical current flow from terminal points not shown on the successively connected Meßgitterstege 5 and at its ends only on the thin transverse webs 6. Here are the open to the rear longitudinal webs 7 with the large anchor surfaces 8, over which no measuring signal current flows, only for setting the desired negative creep or the correct relaxation.
  • Fig. 1 of the drawing is at the same time above the partial representation of the strain gauge according to the invention whose shear stress ⁇ , and strain curve S 1 on the relative length X, shown at a constant mean strain ⁇ m . From the shear stress curve 2 it can be seen that, when the strain gauge in the measuring grid web 5 is loaded on the entire length c, the shear stresses are almost zero. Only in the region of the thin transverse web 5 through which flows the measuring signal current, small shear stresses 11 are recognizable, the effect on the measurement signal current is negligible.
  • the anchor surfaces 8 may be formed with pointed or round inlet or outlet ends. Such an anchor surface 8 with round and tapered inlet 9 and outlet ends 10 can be seen from Fig. 4 of the drawing.
  • Fig. 2 of the drawing The simplest embodiment of the invention for adjusting the negative creep of a strain gauge is shown in Fig. 2 of the drawing.
  • the reversal point 4 following the measuring grid webs 5 consists of a narrow transverse web 6 and two extending longitudinal webs 7 of length b.
  • the longitudinal webs 7 in this case have a width which corresponds to those of the measuring grid webs 5.
  • the desired negative creep can be determined by the respective length b of the longitudinal webs 7.
  • no special anchor surfaces are provided within the longitudinal webs 7. A little positive
  • Messisme creep is compensated by relatively long and a large measuring body creeping by relatively short longitudinal webs 7.
  • the longitudinal webs 7 have a length b of about 100 to 250 microns.
  • the length b is determined not only from the web width of the measuring grid webs 5, but primarily by the positive Meß stresseskriechen to be compensated.
  • Corresponding length measures b can be determined experimentally or calculated by specifying appropriate strain parameters.
  • a reversal point education is shown, which additionally compensates for etching tolerances by special design of the longitudinal webs 7. Because at one
  • Etching tolerance of, for example ⁇ 2 ⁇ m also changes the tensile force effect of the Meßgitterstege 5 on the reversal points 4 and thereby changed the negative creep of the strain gauge not insignificant. For example, if the webs 5,7,6 wider by etching tolerances by the same amount, so the negative creep of a normal strain gauge would increase, since the ratio of tensile stresses in the metal mesh to the shear stresses in the support sheet of the strain gauge in favor of tensile stresses would change in the metal grid. This is compensated in the strain gauges of FIG. 3 of the drawing, characterized in that the broadening by the etching tolerance in the thinner longitudinal ridge 7 means a relatively larger broadening than in the Meßgitterstegen 5.
  • a relatively larger broadening of the longitudinal ridge 7 acts but like a disproportionate enlargement of a reversal site 4, which tends to result in a reduction of the negative strain gauge creep. Both influences compensate each other with correct dimensioning, so that the positive creep of the spring body also at
  • the length b and the width of the longitudinal webs 7 are suitably dimensioned, with a greater length c creep a smaller negative strain gauge and a larger
  • Width means a small compensation of the etching tolerances.
  • An advantageous embodiment of a strain gauge has measuring grid webs 5 of 30 microns wide and 3 mm in length c, wherein the longitudinal webs 7 then about 20 microns wide and 200 microns long (b) to decouple the shear stresses ⁇ advantageous from the crossbar 6 and to compensate well for the etching tolerances.
  • a constant longitudinal web thickness is advantageous for average to larger negative creep values of the strain gauge, with which also a relatively middle to larger spring body creep can be compensated.
  • a reversal point formation is shown, which is preferably provided for a relatively small spring body creep.
  • the ends of the longitudinal webs 7 are formed by a broadening to an anchor surface 8, through which the tensile stresses of the Meßgitterstege 5 spread over a larger area, whereby the shear stresses are lower overall and thereby the negative creep of the strain gauge is reduced.
  • the broadening at the end of the longitudinal webs 7 to an anchor surface 8 is shown in Fig. 4 of the drawing with a rounded outlet end 10 and a bevelled and round inlet end formed 9.
  • Such widenings of the longitudinal webs 7 to anchor surfaces 8 are preferably made on a length a of about 100 microns and usually have a width of 80 to 130 microns, wherein the remaining longitudinal ridge 7 still has a length b of about 80 to 150 microns.
  • the inlet ends 9 can also extend obliquely or conically in order to reduce the shear stresses ⁇ . To reduce the
  • Shear stresses ⁇ in the end region of the armature surface 8 of the longitudinal web 7 can also taper the outlet end 10 obliquely and thus pointed or conical.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Combined Means For Separation Of Solids (AREA)
  • Measurement Of Force In General (AREA)

Abstract

L'invention concerne une jauge de contrainte pour enregistreur de grandeur mesurée, comprenant une grille de mesure (1) en méandres, disposée sur une couche porteuse du type en feuille. La grille de mesure (1) est constituée par des languettes de grille de mesure (5) aux extrémités desquelles des zones d'inversion (4) avec une languette transversale (6) sont disposées pour la liaison avec la languette de grille de mesure (5) disposée parallèlement. L'invention est caractérisée en ce que chaque zone d'inversion (4) est constituée par une languette transversale mince (6) et deux languettes longitudinales (7) en tant que prolongement de la languette de grille de mesure (5). La languette transversale mince (6) est disposée au point d'extrémité des languettes de grille de mesure (5) et au point initial des languettes longitudinales (7), les languettes longitudinales (7) étant ouvertes vers l'extérieur.
PCT/EP2007/003932 2006-05-05 2007-05-04 Jauge de contrainte pour enregistreur de grandeur mesurée WO2007128504A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2007800255333A CN101484787B (zh) 2006-05-05 2007-05-04 用于测量量接收器的应变片

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006021423.4 2006-05-05
DE102006021423.4A DE102006021423B4 (de) 2006-05-05 2006-05-05 Dehnungsmessstreifen für Messgrößenaufnehmer

Publications (1)

Publication Number Publication Date
WO2007128504A1 true WO2007128504A1 (fr) 2007-11-15

Family

ID=38543821

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2007/003932 WO2007128504A1 (fr) 2006-05-05 2007-05-04 Jauge de contrainte pour enregistreur de grandeur mesurée

Country Status (3)

Country Link
CN (1) CN101484787B (fr)
DE (1) DE102006021423B4 (fr)
WO (1) WO2007128504A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008055774B4 (de) 2008-11-04 2013-07-25 Bundesrepublik Deutschland, vertr.d.d. Bundesministerium für Wirtschaft und Technologie, d.vertr.d.d. Präsidenten der Physikalisch-Technischen Bundesanstalt Vorrichtung zum Messen einer Temperatur eines Bauteils und Vorrichtung zum Messen einer Dehnung eines Bauteils
DE102013213219B4 (de) 2013-07-05 2021-12-23 Siemens Healthcare Gmbh Vorrichtung zur Bestimmung einer Verformungsinformation für ein mit einer Last beaufschlagtes Brett

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0451636A1 (fr) * 1990-04-07 1991-10-16 Hottinger Baldwin Messtechnik Gmbh Bande pour jauge d'allongement et transducteur utilisant une telle bande
FR2667150A1 (fr) * 1990-09-24 1992-03-27 Dal Dan Felice Jauge de contrainte a sorties multiples.
DE19909042A1 (de) * 1999-03-02 2000-09-07 Hbm Waegetechnik Gmbh Dehnungsmeßstreifen für Meßgrößenaufnehmer

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB728606A (en) * 1952-08-28 1955-04-20 Technograph Printed Circuits L Electric resistance devices
US2992400A (en) * 1957-11-29 1961-07-11 Baldwin Lima Hamilton Corp Foil filament strain gage
DE3504276C1 (de) * 1985-02-08 1986-07-24 T. Nikolaus 7530 Pforzheim Württemberger Wandler
JP3443111B2 (ja) * 2001-06-29 2003-09-02 ミネベア株式会社 はくひずみゲージ
US20040159162A1 (en) * 2003-02-19 2004-08-19 Vishay Intertechnology Strain gage

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0451636A1 (fr) * 1990-04-07 1991-10-16 Hottinger Baldwin Messtechnik Gmbh Bande pour jauge d'allongement et transducteur utilisant une telle bande
FR2667150A1 (fr) * 1990-09-24 1992-03-27 Dal Dan Felice Jauge de contrainte a sorties multiples.
DE19909042A1 (de) * 1999-03-02 2000-09-07 Hbm Waegetechnik Gmbh Dehnungsmeßstreifen für Meßgrößenaufnehmer

Also Published As

Publication number Publication date
CN101484787A (zh) 2009-07-15
CN101484787B (zh) 2011-03-30
DE102006021423B4 (de) 2016-06-02
DE102006021423A1 (de) 2007-11-08

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