DE875879C - Shielding method for strain gauges - Google Patents

Shielding method for strain gauges

Info

Publication number
DE875879C
DE875879C DEM10369A DEM0010369A DE875879C DE 875879 C DE875879 C DE 875879C DE M10369 A DEM10369 A DE M10369A DE M0010369 A DEM0010369 A DE M0010369A DE 875879 C DE875879 C DE 875879C
Authority
DE
Germany
Prior art keywords
strain gauges
shielding method
shielding
workpiece
electrically conductive
Prior art date
Legal status (The legal status 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 status listed.)
Expired
Application number
DEM10369A
Other languages
German (de)
Inventor
Hans Heinrich Dr-I Emschermann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
STADT BERLIN
Original Assignee
STADT BERLIN
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 STADT BERLIN filed Critical STADT BERLIN
Priority to DEM10369A priority Critical patent/DE875879C/en
Application granted granted Critical
Publication of DE875879C publication Critical patent/DE875879C/en
Expired legal-status Critical Current

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

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)

Description

Abschirmverfahren für Dehnungsmeßstreifen Gegenstand der Erfindung ist ein Abschirmverfahren für Dehnungsmeßstreifen, das darin be steht, daß zwischen dem Meßstreifen und der gedehnten Unterlage. z. B. Konstruktionsteil oder Werkstück, ein elketrisch leitendes Material gebracht wird, das einer Dehnung in der zu messenden Richtung einen geringen mechanischen Widerstand elitgegensetzt und das gegen die Unterlage und den Meßstreifen isoliert ist.Screening method for strain gauges is the subject of the invention is a shielding method for strain gauges that is that between the measuring strip and the stretched surface. z. B. Construction part or workpiece, an electrically conductive material is brought to an elongation in the to be measured In the direction of a low mechanical resistance against the elite and against the Pad and the measuring strip is insulated.

Die Messung von Dehnungen mit Dlehnungsmeßstreifen beruht darauf, daß ein Widerstandsdraht auf den Werkstoff aufgeklebt wird und bei Dehnung des W.erkstoffes seine Länge seinen Quer. schnitt und seine elektrische Leitfähigkeit, also seinen elektrischen Widerstand ändert, so daß die Dehungsmessung auf die Messung einer Widerstandsänderung zurückgeführt werden kann. Bisher wurden Dehnungen mit aufgeklebten, nicht abgEeschirmten Dehnungsmeßstreifen gemessen. Dieses Verfahren hat aden Nachteil, daß Störsplannlungen insbesondere über die Kapazität zwischen Unterlage und Meßstreifen auf letzteren gelangen können und den Störepegel des Meßverfahresn stark vergrößern oder Falschmessungen verursachen Die neue Erfindung vermeidet dies Nachteile. The measurement of strain with strain gauges is based on that a resistance wire is glued to the material and when the material is stretched its length its cross. cut and its electrical conductivity, i.e. his electrical resistance changes, so the strain measurement is based on the measurement of a Change in resistance can be traced back. So far, expansions have been made with glued-on, not screened strain gauges measured. This method has the disadvantage that Störsplannlungen in particular about the capacitance between the base and the measuring strips can reach the latter and greatly increase the interference level of the measuring process or cause incorrect measurements. The new invention avoids these disadvantages.

Nach dem neuen Verfahren wird zwischen Unterlage und Dehnungsmeßstreifen ein elektrisch leitendes Material, das sowohl von der Unterlage als auch vom Meßstreifen isoliert sein muß, gebracht.According to the new method, between the base and the strain gauges an electrically conductive material, both from the pad and from the measuring strip must be isolated.

Elektrische Feldintien, die von der Unterlage aus gehen, münden auf der Abschirmung und können nach Masse oder Erde, z. B. über den Abschirm- mantel des Meßkables, abgeleitet werden, ohne daß Störspannungen auf den Meßgeber gelangen. Die Abschirmung muß sd ausgebildet sein, daß sie den Übertritt von elektrischen Feldlinien vom Wlerkstück zum Meßstreifen verhindert, ohne den mechanischen Kraftschluß zwischen Werkstück und Meßstreifen 1,1 behindern.Electric fields that go from the base open out the shield and can be based on ground or earth, z. B. via the shielding a coat of the measuring cable, without interference voltages reaching the measuring transducer. The shielding must be designed to prevent the passage of electrical Field lines from the workpiece to the measuring strip are prevented without the mechanical frictional connection hinder between workpiece and measuring strip 1.1.

Aus diesen beiden Forderungen ergibt sich, daß deis Abschirmung den Geber vollständig unschließen muß und daß sie einen geringen Verformungswiderstand in der Dehnrichtung des Meßstreifens haben soll. From these two requirements it follows that the shielding the Encoder must be completely closed and that it has a low resistance to deformation should have in the stretching direction of the measuring strip.

Claims (6)

PATENTANSPRÜCHE: r. Abschirrn.verfahren für Dehnungsmeßstreifen, dadurch gekennzeichnet, daß zwischen Werkstück und Dehnungsmeßstreifen ein elektrisch leitendes Material gebracht wird, das gegenüber Werkstück und Meßstreifen isoliert ist und das den mechanischen Kraftschluß zwischen Werkstück und Dehnungsmeßstriefen nicht hindert. PATENT CLAIMS: r. Disconnection method for strain gauges, characterized in that between the workpiece and the strain gauge there is an electrical conductive material is brought, which insulates against workpiece and measuring strips and that is the mechanical frictional connection between the workpiece and the strain gauges does not prevent. 2. Abschirmverfahren für Dehungsmeßstreifen nach Anspruch 1, dadurch gekenneichnet, daß die Abschirmung aus einer eng gewickelten Wendel aus Metall besteht. 2. Shielding method for strain gauges according to claim 1, characterized known that the shield consists of a tightly wound coil made of metal. 3. Abschirmverfahren für Dehnuugsmeß streifen nach Anspruchs und/oder 2, dadurch gekennzeichnet, daß die Windungen der Wendel elektrisch leitend miteinander verbunden sind. 3. Shielding method for Dehnuugsmeß strip according to claim and / or 2, characterized in that the turns of the helix are electrically conductive with one another are connected. 4. Abschirmvefarhn für Dehnungsmeßstreifen nach Anspruch I uRd/odler 2 und/oder 3, dadurch gekennzeichnet, daß die Abschirmung aus nebeneinanderliegenden Drähten oder Bän. dem besteht, die elektrisch leiten und die elektrisch leitend verbunden sind. 4. Shielding for strain gauges according to claim I uRd / odler 2 and / or 3, characterized in that the shield consists of adjacent Wires or ribbons. that consists of those that are electrically conductive and those that are electrically conductive are connected. 5l. Abschirmverfharen für Dehnungsmeßstreifen nach Anspruch, 1 und/oder 2 und/eder 3 und/oder 4, dadurch gekennzeichnet, daß die Abschirmung aus einer metallisierten Folie besteht. 5l. Shielding method for strain gauges according to claim 1 and / or 2 and / or 3 and / or 4, characterized in that the shield consists of a metallized Foil consists. 6. Abschirmverfahren für Dehnungsmeßstreifen nach Anspruch I und/oder 2 und/oder 3 und/oder 4 und/oder 5, dadurch gekennzleichnet, daß die Abschirmung aus einer metallisierten Folie besteht, die quer zur Dlehnungsrichtung zwischen Werkstoff und Meßstreifen mehrfach eingeschnitten ist. 6. Shielding method for strain gauges according to claim I and / or 2 and / or 3 and / or 4 and / or 5, characterized in that the shield consists of a metallized film, which is transverse to the direction of stretching between Material and measuring strips are cut several times.
DEM10369A 1951-07-25 1951-07-25 Shielding method for strain gauges Expired DE875879C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEM10369A DE875879C (en) 1951-07-25 1951-07-25 Shielding method for strain gauges

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEM10369A DE875879C (en) 1951-07-25 1951-07-25 Shielding method for strain gauges

Publications (1)

Publication Number Publication Date
DE875879C true DE875879C (en) 1953-05-07

Family

ID=7295114

Family Applications (1)

Application Number Title Priority Date Filing Date
DEM10369A Expired DE875879C (en) 1951-07-25 1951-07-25 Shielding method for strain gauges

Country Status (1)

Country Link
DE (1) DE875879C (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2435022A1 (en) * 1978-08-28 1980-03-28 Babcock & Wilcox Co PRESSURE TRANSDUCERS WITH ELECTRICALLY PROTECTED PIEZO-RESISTANT SENSORS
DE2902242C2 (en) * 1979-01-20 1981-03-26 W.C. Heraeus Gmbh, 63450 Hanau Strain gauges
DE102005032086A1 (en) * 2005-07-08 2007-01-11 Siemens Ag Injector valve especially for high pressure fuel system has a sensor directly attached to the valve spring to monitor the valve settings

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2435022A1 (en) * 1978-08-28 1980-03-28 Babcock & Wilcox Co PRESSURE TRANSDUCERS WITH ELECTRICALLY PROTECTED PIEZO-RESISTANT SENSORS
DE2902242C2 (en) * 1979-01-20 1981-03-26 W.C. Heraeus Gmbh, 63450 Hanau Strain gauges
DE102005032086A1 (en) * 2005-07-08 2007-01-11 Siemens Ag Injector valve especially for high pressure fuel system has a sensor directly attached to the valve spring to monitor the valve settings
DE102005032086B4 (en) * 2005-07-08 2014-03-27 Continental Automotive Gmbh Switching valve device and injection valve

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