Types of strain gages include foil strain gage, wire strain gage. Strain gauge or strain gage was invented in 1938 by edward e. We have covered its working principles, characteristics, features, as well as. This catalog presents the full range of tml standard strain gauges and associated products including bonding. Most strain gages are of foil construction, illustrated in fig. The metallic strain gauge consists of a very fine wire or, more commonly.
A strain gauge is an electrical transducer which is used for measuring mechanical surface strain. When it is stretched, its resistance increases and vice versa. It is one of the significant sensors used in the geotechnical field to measure the amount of strain on any. When force is applied to any metallic wire its length increases due to the strain. Pdf application of strain gauges in measurements of. Pdf strain gauge principle, types, features and applications. There are several strain gauge types based on the principle of their working viz. Principle of strain gages the strain gage is tightly bonded to a measuring object so that the sensing element metallic resistive foil may elongate or contract according to the strain borne by the measuring object.
Strain gauge working principle your electrical guide. A strain gauge is a passive transducer, that converts mechanical displacement into the change of resistance. A strain gauge is a long length of conductor arranged in a zigzag pattern on a membrane. When bearing mechanical elongation or contraction, most metals undergo a change in electric resistance. All the theories related t o design a strain gauge has already.
Strain gauge working principle instrumentation tools. Pdf strain gauges are used to measure the strain of a material. The more is the applied force, more is the strain and more is the increase in length of the wire. Considering the mounting, strain gauges can be either bonded or unbonded and based on the construction, we can have foil, semiconductor, and photoelectric strain gauges.
Basic principle of strain gauge when stress is applied to the metal conductor, its resistance changes owing to change in length and crosssectional area of the conductor. In this clip we will discuss that how does a strain gauge works. Principle, types, features and applications medium. When an external force is applied on an object, due to which there is a deformation occurs in the shape of the object.
In this article, i am going to describe you strain gauge working principle, gauge factor and strain gauge load cell working. Heres everything that you need to know about strain gauges. Attaching a strain gauge to a diaphragm results in a device that changes resistance with applied pressure. Construction and working principle electronic instrumentation duration. Principle of working of strain gauges when force is applied to any metallic wire its length increases due to the strain. A strain gauge sensor is a thin waferlike device that can be attached to a variety of materials to measure applied strain. Pressure forces the diaphragm to deform, which in turn causes the strain gauge to change resistance.