DE1035936B - Strain gauges made from a one-piece, meander-shaped resistance wire and process for its manufacture - Google Patents
Strain gauges made from a one-piece, meander-shaped resistance wire and process for its manufactureInfo
- Publication number
- DE1035936B DE1035936B DEL14213A DEL0014213A DE1035936B DE 1035936 B DE1035936 B DE 1035936B DE L14213 A DEL14213 A DE L14213A DE L0014213 A DEL0014213 A DE L0014213A DE 1035936 B DE1035936 B DE 1035936B
- Authority
- DE
- Germany
- Prior art keywords
- strain gauges
- resistance wire
- piece
- metal coating
- meander
- 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.)
- Pending
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
Dehnungsmeßstreifen aus einem einstückigen mäanderförmig gebogenen Widerstandsdraht und Verfahren zu seiner Herstellung Aufgabe der vorliegend beschriebenen Erfindung ist es, die Herstellung von Dehnungsmeßstreifen mit verminderter Querdehnungsempfindl ichkei t wesentlich zu vereinfachen. Strain gauges made from a one-piece, meander-shaped bent Resistance wire and method for its production object of the presently described The invention is the production of strain gauges with reduced transverse strain sensitivity simplification significantly.
Bei den bekannten Dehnungsmeßstreifen ist ein sehr feiner Widerstandsdraht mäanderförmig mit mehreren Windungen auf einen geeigneten Träger aufgebracht. The known strain gauges have a very fine resistance wire Applied in a meandering shape with several turns on a suitable carrier.
Ein solcher Dehnungsmeßstreifen kann als Meßelement an einen auf mechanische Beanspruchung zu untersuchenden Körper aufgeklebt werden. Mittels bekarmter Brückenschaltungen in Verbindung mit einem Anzeigegerät (Galvanometer, Oszillograph od. dgl.) wird die durch eine Längenänderung des Widerstandsdrahtes hervorgerufene Widerstandsänderung gemess.n hzw. angezeigt.Such a strain gauge can be used as a measuring element on a mechanical one Stress to be examined body to be glued. By means of well-known bridges in connection with a display device (galvanometer, oscilloscope or the like) the change in resistance caused by a change in length of the resistance wire measured n h or displayed.
I)ie Fig. 1 stellt den schematischen Aufbau eines bekarlllten Dehnungsmeßstreifens dar. I) ie Fig. 1 shows the schematic structure of a stressed strain gauge represent.
Auf einem Träger 1, der z. B. aus dünnem Papier besteht, ist ein äußerst feiner Widerstandsdraht 2 in mehreren Windungen mäanderförmig aufgeklebt. Die Umkehrstellen 3 des Drahtes sind halbkreisförmig ausgeführt. An den verstärkt ausgefiihrten Enden 4 des Meßelementes werden die bekannten AZIeßvorrichtungen angeschlossen. Da der Prüfkörper sehr oft aus Afetall besteht, bildet der Träger 1 außerdem die Isolation zwischen dem Prüfkörper und dem Widerstandsdraht. Über den Widerstandsdraht ist in vielen Fällen noch ein Deckblatt geklebt, das den Dehnungsineßstreifen gegen Feuchtigkeit oder mechanische Beanspruclmng schützt. On a carrier 1, the z. B. consists of thin paper is a extremely fine resistance wire 2 glued on in several turns in a meandering shape. The reversal points 3 of the wire are semicircular. At the reinforced The known metering devices are connected to the executed ends 4 of the measuring element. Since the test body very often consists of Afetall, the carrier 1 also forms the Isolation between the test body and the resistance wire. About the resistance wire In many cases, a cover sheet is glued to counteract the stretch marks Protects moisture or mechanical stress.
Um die bei dieser Ausführungsart auftretende QuerdehnutlgsetnpfitldlichlSeit zu vermeiden, können die halbkreisförmigen Schleifen des Meßstreifens durch kurze Querdrähte mit stärkerem Durchmesser ersetzt werden. Zweckmäßig bestehen diese Querdrähxte aus einem Werkstoff mit hoher elektrischer Leitfähigkeit. In order to avoid the transverse expansion that occurs with this type of construction To avoid the semicircular loops of the measuring strip by short Cross wires with a larger diameter are replaced. These cross wires are expediently made made of a material with high electrical conductivity.
Die Fig. 2 stellt einen derartigen bekanntgewordenen Aleßstreifen dar. Fig. 2 shows such a known food strip represent.
I)as Meßelement besteht dabei nicht mehr aus einem durchgehenden Widerstandsdraht, sondern aus mehreren einzelnen bei der Niessung wirksamen Längsderähten 2, die an ihren Enden mit den im Durchmesser stärkeren Querdrähten 3 verbunden sind. Die Verbindung wird entweder durch Löten oder durch Schweißen hergestellt. Da die Längsdrähte nur einen Durchmesser von etwa 20 n haben, ergeben sich bei diesem Herstellungsverfahren erhebliche fertigungstechnische Schwierigkeiten . I) the measuring element no longer consists of a continuous one Resistance wire, but rather from several individual longitudinal wires that are effective for the riveting 2, which are connected at their ends to the cross wires 3 with a larger diameter. The connection is made either by soldering or welding. Since the Line wires only have a diameter of about 20 n, result from this manufacturing process considerable manufacturing difficulties.
Wesentlich einfacher läßt sich ein Dehnungsmeßstreifen aus einem einstückigen mäanderförmig gebogenen Widerstandsdraht dann herstellen, wenn erfindungsgemäß zur Verminderung seiner Querdehnungsempfindlichkeit die einer Querdehnung unterworfenen Drahtstrecken (Umkehrstelien) mit einem Me- tal lüberzug großer elektrischer Leitfähigkeit versehen sind. In Ausgestaltung der Erfindung wird der Metallüberzug durch ein Tauchverfahren aufgebracht. A strain gauge from one can be made much easier then produce one-piece meandering bent resistance wire if according to the invention to reduce its sensitivity to transverse stretching, those subjected to transverse stretching Wire routes (reversal points) with a meter valley coating of great electrical conductivity are provided. In an embodiment of the invention, the metal coating is made by a dipping process upset.
Vorteilhaft werden dabei die beiden Reihen der Umkehrstellen nacheinander, also in zwei Arbeitsgängen, dem Tauchverfahren unterworfen. Zweckmäßig wird als Material für den Überzug Silber verwendet. Beispielsweise kann der ueberzug auch im Vakuum aufgedampft werden.The two rows of reversal points are advantageous one after the other, so in two work steps, subjected to the immersion process. Appropriate is as Material used for the plating silver. For example, the cover can also be evaporated in a vacuum.
Aus Fig. 3 ist ein schematisches Ausführungsbeispiel der Erfindung ersichtlich. From Fig. 3 is a schematic embodiment of the invention evident.
Die Herstellung dieses Dehnungsmeßstreifens geschieht in der gleichen Weise wie die des an Hand von Fig. 1 erläuterten Meßstreifens. Der Widerstandsdraht 2 wird mit einem geeigneten Kleber auf dem Träger 1 aufgeklebt. Die Umkehrstellen 3 werden jedoch nocht nicht festgeklebt, sondern z. B. durch Tauchen in ein Silberbad mit den in der Zeichnung angedeuteten Überzügen versehen. Anschließend werden die Umkehrstellen auf dem Träger festgeklebt. This strain gauge is made in the same way Way like that of the measuring strip explained with reference to FIG. The resistance wire 2 is glued to the carrier 1 with a suitable adhesive. The turning points 3 are still not glued, but z. B. by dipping in a silver bath provided with the coatings indicated in the drawing. Then the Reversal points glued to the carrier.
Offensichtlich ist der erfindungsgemäße Dehnungsmeßstreifen erheblich einfacher herzustellen als die bekannten Dehnungsmeßstreifen mit verminderter Querdehnungsempfindlichkeit.Obviously, the strain gauge of the invention is substantial easier to manufacture than the known strain gauges with reduced transverse strain sensitivity.
Claims (5)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEL14213A DE1035936B (en) | 1952-12-17 | 1952-12-17 | Strain gauges made from a one-piece, meander-shaped resistance wire and process for its manufacture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEL14213A DE1035936B (en) | 1952-12-17 | 1952-12-17 | Strain gauges made from a one-piece, meander-shaped resistance wire and process for its manufacture |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE1035936B true DE1035936B (en) | 1958-08-07 |
Family
ID=7259753
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DEL14213A Pending DE1035936B (en) | 1952-12-17 | 1952-12-17 | Strain gauges made from a one-piece, meander-shaped resistance wire and process for its manufacture |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE1035936B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1216579B (en) * | 1961-03-17 | 1966-05-12 | Western Electric Co | Strain gauges made of semiconductor material with piezoelectric resistance |
| DE10260577A1 (en) * | 2002-12-21 | 2004-07-08 | Gwt Global Weighing Technologies Gmbh | Strain gauge for load cell, has resistance tracks, whose thickness can be altered e.g. by etching or abrasive techniques |
-
1952
- 1952-12-17 DE DEL14213A patent/DE1035936B/en active Pending
Non-Patent Citations (1)
| Title |
|---|
| None * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1216579B (en) * | 1961-03-17 | 1966-05-12 | Western Electric Co | Strain gauges made of semiconductor material with piezoelectric resistance |
| DE1573942B1 (en) * | 1961-03-17 | 1971-03-11 | Western Electric Co | EXTENSION MEASURING ELEMENT MADE OF SEMI-CONDUCTIVE MATERIAL WITH PIEZOELECTRIC RESISTANCE |
| DE10260577A1 (en) * | 2002-12-21 | 2004-07-08 | Gwt Global Weighing Technologies Gmbh | Strain gauge for load cell, has resistance tracks, whose thickness can be altered e.g. by etching or abrasive techniques |
| DE10260577B4 (en) * | 2002-12-21 | 2005-07-28 | Sartorius Hamburg Gmbh | Strain gauges with variable nominal resistance |
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