File Name: strain gauge and its types .zip
Chipkin has integration solutions for almost every situation. Click for more information:. Various means like mechanical, optical, acoustical, pneumatic or electrical can be used to measure deformation strain of an object. However, mechanical strain gauges offer certain limitations like low resolutions. Besides they are bulky and difficult to use. These gauges use a light beam, two fine gratings, and a photocell detector to generate an electrical current proportional to strain.
The strain gauges are based on the resistive properties of the metal. Upon stretching, the metal material loses or increases its electrical resistance. The strain gauge foil is glued on the material, which will be tested using a specially adapted glue for strain gauges. Due to the correct fit to the material being examined, the strain gauge is bent in the same way as the test material, so it reproduces the stresses. Strain gauge theory tells about resistance elements that are found in a large amount of electronic equipment.
A strain gauge was invented by Edward E. Simmons and Arthur C. Ruge, in This invention led to the measurement of a significant amount of strain on various structures. A strain gauge is a type of sensor used in a wide variety of applications to measure the strain of an object. Definition: A strain gauge is one of the imperative devices used in the field of geotechnical engineering to measure strain on diverse structures.
A strain gauge also spelled strain gage is a device used to measure strain on an object. Invented by Edward E. Simmons and Arthur C. Ruge in , the most common type of strain gauge consists of an insulating flexible backing which supports a metallic foil pattern. The gauge is attached to the object by a suitable adhesive, such as cyanoacrylate. This resistance change, usually measured using a Wheatstone bridge , is related to the strain by the quantity known as the gauge factor.
Several types of strain gages depend for their operation on the proportional variance of electrical resistance to strain: the piezoresistive or semi-conductor gage, the carbon resistive gage, the bonded metallic wire, and foil resistance gages. The bonded resistance strain gage is by far the most widely used in experimental stress analysis. This gage consists of a grid of very fine wire or foil bonded to a backing or carrier matrix. The electrical resistance of the grid varies linearly with strain. In use, the carrier matrix is bonded to the surface, force is applied, and the strain is found by measuring the change in resistance. The bonded resistance strain gage is low in cost, can be made with a short gage length, is only moderately affected by temperature changes, has small physical size and low mass, and has fairly high sensitivity to strain. In a strain gage application, the carrier matrix and the adhesive must work together to transmit the strain from the specimen to the grid.
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