FR2606875A1 - Method for producing a strain gauge - Google Patents
Method for producing a strain gauge Download PDFInfo
- Publication number
- FR2606875A1 FR2606875A1 FR8615982A FR8615982A FR2606875A1 FR 2606875 A1 FR2606875 A1 FR 2606875A1 FR 8615982 A FR8615982 A FR 8615982A FR 8615982 A FR8615982 A FR 8615982A FR 2606875 A1 FR2606875 A1 FR 2606875A1
- Authority
- FR
- France
- Prior art keywords
- strain gauge
- producing
- test body
- ceramic substrate
- thick ceramic
- 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.)
- Granted
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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
- G01L1/2293—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 of the semi-conductor type
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Force In General (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
Abstract
Description
Procedé de réalisation d'une jauge de contrainte
La présente invention a pour objet un procédé de réalisation d'une jauge de contrainte. Actuellement les jauges de contrainte sont constituées par un film qui sera fixé sur un corps d'épreuve soumis à la pression à mesurer, sur lequel sont disposées une ou plusieurs résistances connectées à un dispositif qui mesurera les variations de pression en fonction de la déformation du substrat.Procedure for making a strain gauge
The present invention relates to a method of producing a strain gauge. Currently the strain gauges consist of a film which will be fixed on a test body subjected to the pressure to be measured, on which are arranged one or more resistors connected to a device which will measure the pressure variations as a function of the deformation of the substrate.
Plus precisement le film est en polyamide d'un ou deux centièmes de millimètre d'épaisseur sur lequel sont disposes des fils métalliques d'environ cinq microns d'épaisseur formant la ou les résistances. Ce film est ensuite collé sur un corps d'épreuve. De telles jauges sont fragiles; elles doivent être collées minutieusement et les connexions des résistances microsoudées avec de très petits fils de raccordement. De plus, afin de permettre l'utilisation de ces jauges avec de grands écarts de température on doit disposer également des résistances dites "de compensation". More precisely, the film is made of polyamide one or two hundredths of a millimeter thick, on which are arranged metal wires about five microns thick forming the resistor (s). This film is then pasted on a test body. Such gauges are fragile; they must be glued carefully and the connections of the resistors microwelded with very small connecting wires. In addition, in order to allow the use of these gauges with large temperature differences, it is also necessary to have so-called "compensation" resistors.
Afin de pallier à ces inconvénients on a réalisé des jauges en différents materiaux; on emploie actuellement des résistances à trames pelliculaires. Tous ces perfectionnements ont entraine une fabrication des jauges de contrainte très onéreuse, leur manipulation etant toujours difficile et entrainant des pertes non négligeables. In order to overcome these drawbacks, gauges were made of different materials; currently used film frame resistors. All of these improvements have resulted in very expensive strain gauge manufacturing, their handling being always difficult and resulting in significant losses.
La présente invention a pour objet de remédier à ces inconvénients et surtout de permettre la réalisation de jauges de contrainte très peu coûteuse. The object of the present invention is to remedy these drawbacks and above all to allow very inexpensive stress gauges to be produced.
Le Demandeur a constaté, après différentes expérimentations, que rien ne s opposait à l'utilisation d'un substrat épais en céramique rapporté sur le corps d'épreuve par soudage ou collage rendant bien évidemment plus facile la realisation de la jauge de contrainte. Jusqu'à maintenant personne n'a utilise de substrat epais en céramique rapporté sur le corps d'épreuve, ce qui pourtant supprime un grand nombre de difficultés de realisation des jauges. En effet, les capteurs en céramique épaisse déjà utilisés sont limités à la réalisation de capteurs de pression; l'association céramique épaisse et corps d'épreuve, c'est-à-dire une jauge rapportée sur un ouvrage d'art, par exemple un pont, n'a jamais été réalisée à ce jour. The Applicant has found, after various experiments, that there was nothing to prevent the use of a thick ceramic substrate attached to the test body by welding or gluing, obviously making it easier to produce the strain gauge. Until now, no one has used a thick ceramic substrate attached to the test body, which however eliminates a large number of difficulties in making the gauges. Indeed, the thick ceramic sensors already used are limited to the production of pressure sensors; the combination of thick ceramic and test body, that is to say a gauge attached to a structure, for example a bridge, has never been achieved to date.
Le procédé de fabrication d'une jauge de contrainte selon l'invention est original et caractérisé par le fait que l'on fixe une plaquette épaisse de céramique, sur laquelle on a préa-lablement sérigraphié ou déposé par d'autres moyens une ou plusieurs resistances, y compris leurs connexions respectives, directement sur un corps d'epreuve, au moyen d'une colle, ce procédé ne nécessitant pas de main d'oeuvre spécialisée. The method of manufacturing a strain gauge according to the invention is original and characterized by the fact that one fixes a thick ceramic plate, on which one has previously been screen-printed or deposited by other means one or more resistors, including their respective connections, directly on a test body, by means of an adhesive, this process not requiring specialized labor.
Il faut entendre par plaquette céramique épaisse une plaquette de 0,6 mm. d'epaisseur standard dans le commerce
La colle utilisée pour rendre solidaire la plaquette épaisse en céramique du corps d'épreuve peut être une colle epoxy ou analogue. La plaquette de céramique peut avantageusement comporter sur une de ses faces un metal soudable pour sa fixation sur le corps d'epreuve. Elle peut également être fixée par brasage, ou au moyen d'une fine couche de verre.A thick ceramic plate should be understood to mean a 0.6 mm plate. commercially standard thickness
The adhesive used to secure the thick ceramic plate to the test body may be an epoxy adhesive or the like. The ceramic plate can advantageously include on one of its faces a weldable metal for its fixing on the test body. It can also be fixed by brazing, or by means of a thin layer of glass.
Le corps d'épreuve peut être en tout matériau du moment que la colle choisie permet une fixation correcte de la plaquette de cramique. The test body can be made of any material as long as the adhesive chosen allows correct fixing of the ceramic plate.
Selon une autre réalisation de l'invention on resalis les résista-nces au moyen d'une pâte sérigraphiée sur une barrette en cramique, ce qui permet d'obtenir des résistances de plusieurs kilo-ohms. L'emploi de pâte sérigraphiée avec de la ceramique epaisse est avantageux et permet de réaliser des jauges de contrainte ayant de bonnes performances sans être limité par la valeur ohmique des résistances. According to another embodiment of the invention, the resistors are resalised by means of a screen-printed paste on a ceramic bar, which makes it possible to obtain resistances of several kilo-ohms. The use of screen-printed paste with thick ceramic is advantageous and makes it possible to produce strain gauges having good performance without being limited by the ohmic value of the resistances.
Du fait que la plaquette de céramique est épaisse, il est évident qu'elle est beaucoup moins fragile, facilitant l'application des résistances par tout moyen approprié et permettant de les ajuster par exemple, avec un laser, avant collage de la plaquette sur le corps d'épreuve, tout en assurant une grande facilité pour leur connexion au dispositif de mesure ne nécessitant pas de main d'oeuvre spécialisée, limitant ainsi grandement le rebut desdites jauges de contrainte. Because the ceramic plate is thick, it is obvious that it is much less fragile, facilitating the application of the resistors by any appropriate means and making it possible to adjust them, for example, with a laser, before bonding the plate to the test body, while ensuring great ease for their connection to the measuring device requiring no specialized labor, thus greatly limiting the scrap of said strain gauges.
De telles jauges de contrainte sont utilisées notamment dans des balances ou autre dispositif de mesure analogue, par exemple dans la marine, l'aviation, l'automobile et le génie civil. Such strain gauges are used in particular in scales or other similar measuring device, for example in the marine, aviation, automotive and civil engineering industries.
Claims (4)
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8615982A FR2606875B1 (en) | 1986-11-18 | 1986-11-18 | METHOD FOR PRODUCING A STRESS GAUGE |
| FR8916774A FR2656094B2 (en) | 1986-11-18 | 1989-12-19 | PROCESS FOR PRODUCING A STRESS GAUGE. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8615982A FR2606875B1 (en) | 1986-11-18 | 1986-11-18 | METHOD FOR PRODUCING A STRESS GAUGE |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| FR2606875A1 true FR2606875A1 (en) | 1988-05-20 |
| FR2606875B1 FR2606875B1 (en) | 1989-06-09 |
Family
ID=9340901
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR8615982A Expired FR2606875B1 (en) | 1986-11-18 | 1986-11-18 | METHOD FOR PRODUCING A STRESS GAUGE |
Country Status (1)
| Country | Link |
|---|---|
| FR (1) | FR2606875B1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2656094A2 (en) * | 1986-11-18 | 1991-06-21 | Dal Dan Felice | Process for producing a strain gauge |
| US5242722A (en) * | 1990-10-29 | 1993-09-07 | Matsushita Electric Industrial Co., Ltd. | Strain sensor |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1015938A (en) * | 1950-04-04 | 1952-10-28 | Snecma | Resistance ceramic extensometers for high temperatures, corrosive media and solvents |
| US3197335A (en) * | 1962-04-09 | 1965-07-27 | Stanley W Leszynski | Surface-mounted electrical resistance structure and method for producing same |
| US3687755A (en) * | 1971-02-12 | 1972-08-29 | George J J Randolph Jr | Method of joining deformation-sensitive element to deformable member |
| US3826130A (en) * | 1971-09-16 | 1974-07-30 | Industrie Automation Gmbh & Co | Electro-mechanical power or pressure measuring transformer |
| US4195279A (en) * | 1978-02-16 | 1980-03-25 | Nasa | Attaching of strain gages to substrates |
| FR2438829A1 (en) * | 1978-10-12 | 1980-05-09 | Magneti Marelli Spa | PRESSURE MEASURING DEVICE USING A RESISTOR EXTENSOMETER |
| EP0053059A1 (en) * | 1980-11-20 | 1982-06-02 | Commissariat à l'Energie Atomique | Strain gauge measurement device with a thin-glass layer support |
| EP0061404A1 (en) * | 1981-03-20 | 1982-09-29 | Félice Dal Dan | Method of producing strain gauge transducers |
| DE3301659A1 (en) * | 1982-02-26 | 1983-09-15 | Hitachi, Ltd., Tokyo | FLUID LEAK DETECTING ELEMENT |
-
1986
- 1986-11-18 FR FR8615982A patent/FR2606875B1/en not_active Expired
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1015938A (en) * | 1950-04-04 | 1952-10-28 | Snecma | Resistance ceramic extensometers for high temperatures, corrosive media and solvents |
| US3197335A (en) * | 1962-04-09 | 1965-07-27 | Stanley W Leszynski | Surface-mounted electrical resistance structure and method for producing same |
| US3687755A (en) * | 1971-02-12 | 1972-08-29 | George J J Randolph Jr | Method of joining deformation-sensitive element to deformable member |
| US3826130A (en) * | 1971-09-16 | 1974-07-30 | Industrie Automation Gmbh & Co | Electro-mechanical power or pressure measuring transformer |
| US4195279A (en) * | 1978-02-16 | 1980-03-25 | Nasa | Attaching of strain gages to substrates |
| FR2438829A1 (en) * | 1978-10-12 | 1980-05-09 | Magneti Marelli Spa | PRESSURE MEASURING DEVICE USING A RESISTOR EXTENSOMETER |
| EP0053059A1 (en) * | 1980-11-20 | 1982-06-02 | Commissariat à l'Energie Atomique | Strain gauge measurement device with a thin-glass layer support |
| EP0061404A1 (en) * | 1981-03-20 | 1982-09-29 | Félice Dal Dan | Method of producing strain gauge transducers |
| DE3301659A1 (en) * | 1982-02-26 | 1983-09-15 | Hitachi, Ltd., Tokyo | FLUID LEAK DETECTING ELEMENT |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2656094A2 (en) * | 1986-11-18 | 1991-06-21 | Dal Dan Felice | Process for producing a strain gauge |
| US5242722A (en) * | 1990-10-29 | 1993-09-07 | Matsushita Electric Industrial Co., Ltd. | Strain sensor |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2606875B1 (en) | 1989-06-09 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| ST | Notification of lapse | ||
| AR | Application made for restoration | ||
| BR | Restoration of rights | ||
| ST | Notification of lapse |