GB570751A - Improvements in or relating to electrical strain gauges - Google Patents
Improvements in or relating to electrical strain gaugesInfo
- Publication number
- GB570751A GB570751A GB1144343A GB1144343A GB570751A GB 570751 A GB570751 A GB 570751A GB 1144343 A GB1144343 A GB 1144343A GB 1144343 A GB1144343 A GB 1144343A GB 570751 A GB570751 A GB 570751A
- Authority
- GB
- United Kingdom
- Prior art keywords
- strain
- temperature
- resistance
- resistances
- elements
- 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
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
- G01L1/225—Measuring circuits therefor
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
- Measurement Of Force In General (AREA)
Abstract
570,751. Resistance measurements; determining dimensions of materials.; temperature compensation; wire resistances ; combinations of resistances. AUGHTIE, F. July 14, 1943 No. 11443. [Class 37] [Also in Group XIX] A resistance strain gauge comprises two elements having different ratios of temperature coefficient to strain coefficient of resistance and so arranged that resistance changes in both elements are related in the same way to both the temperature and strain of the same area of surface of a specimen. If the temperature coefficient of expansion of the test specimen is known, it is then possible to evaluate both strain and temperature change. Each element may be carried on its own support, for example, as described in Specification 560,260, and the two supports be superimposed with an insulating layer, e.g. of thin paper, between them, the whole being bonded into an integral structure by means of a synthetic resin set by heat and pressure. Alternatively, the. corresponding portions of the two elements may be parallel and interspaced so that the separating layer is dispensed with. Each element may be carried on its own support and so arranged that the two can be brought opposite one another in such relative position that the portions on the facing surfaces are approximately parallel and interspaced. The elements can then be bonded together without an intervening layer. The two elements may be wound quasihelically as described in Specification 560,260, but of opposite hands. One element should have a very low temperature coefficient of resistance and the other a high coefficient. Copper-nickel alloy wire of about 0.001 inch diameter is suitable for the first element and tungsten wire of about 0.0005 inch diameter may be used for the second. The separate resistances of the two windings may bo measured first in the initial condition and then with the test object strained and at a temperature different from the initial temperature. From these measured resistances and the known temperature coefficients and strain sensitivities the initial and final strains of the test object can be evaluated by a series of approximations. Alternatively, a high fixed resistance may be connected in series with the element of high temperature coefficient and of such a value that the effective temperature coefficient or the effective strain sensitivity of the two is equal to that of the other element. In the bridge shown, a resistance comprising two parts R1, R2 is connected in series with the strain gauge element M of high temperature coefficient and is of the required value to give strain determination, the other element A forming the adjacent arm of the bridge. The other arms are formed by resistances R3, R4, R5 and slide wires R6, R7. A galvanometer G1 determines the balance point for strain determination, whilst a galvanometer G2, connected to the junction point of the resistances R1, R2 determines the balance point for temperature determination. Strain and temperature may thus be directly and separately determined in the presence of changes of both. Specification 565,378 also is referred to.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1144343A GB570751A (en) | 1943-07-14 | 1943-07-14 | Improvements in or relating to electrical strain gauges |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1144343A GB570751A (en) | 1943-07-14 | 1943-07-14 | Improvements in or relating to electrical strain gauges |
Publications (1)
Publication Number | Publication Date |
---|---|
GB570751A true GB570751A (en) | 1945-07-20 |
Family
ID=9986350
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1144343A Expired GB570751A (en) | 1943-07-14 | 1943-07-14 | Improvements in or relating to electrical strain gauges |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB570751A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4530249A (en) * | 1983-04-12 | 1985-07-23 | Gerhard Lechler | Dynamometer device |
-
1943
- 1943-07-14 GB GB1144343A patent/GB570751A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4530249A (en) * | 1983-04-12 | 1985-07-23 | Gerhard Lechler | Dynamometer device |
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