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Understanding the Principles of Wheatstone Bridge Circuit  

Choi, Byung-Hee (한국지질자원연구원)
Ryu, Chang-Ha (한국지질자원연구원)
Publication Information
Explosives and Blasting / v.35, no.2, 2017 , pp. 9-17 More about this Journal
Abstract
The Wheatstone bridge is an important electrical circuit that is widely used to measure extremely small resistance changes in strain gages. The strain gages are attached to the structure or specimen whose deformation is to be detected. The Wheatstone bridge finds one of its major applications in the areas of static and dynamic strength tests for various engineering materials. In the split Hopkinson pressure bar (SHPB) system, for example, the bridge circuit is required to measure the dynamic strains of the incident and transmitted bars along which the stress wave propagates. In this article, the principles of the Wheatstone bridge circuit are in detail explained for easy reference during laboratory experiments associated with rock dynamics. Especially, the circuit arrangements of the quater, half, and full bridges are presented with their basic uses.
Keywords
Wheatstone bridge circuit; Strain gage; Strength test; SHPB system; Stress wave;
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  • Reference
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3 Wheatstone, C., 1843. An account of several new instruments and processes for determining the constants of a voltaic circuit, Philos. Trans. R. Soc. (London), 133, 303.   DOI