Abstract
A number of sensors used in instrumentation applications are essentially variable resistors. That is, the observed resistance of such a sensing element would be determined by ambient physical conditions such as temperature, light level, or physical strain. For sensors of this type, dc bridge circuits are commonly employed either for explicit resistance measurement, or for monitoring deviations in resistance from some selected reference level. A dc bridge is a particular geometric configuration of resistors (known and unknown) driven by a voltage source, as illustrated in Fig. 4.1. The left-hand representation is the standard form of a bridge, whereas the right-hand diagram is functionally identical but is a slightly more conventional schematic style.
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© 2001 Springer Science+Business Media New York
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Blackburn, J.A. (2001). Bridge Circuits. In: Modern Instrumentation for Scientists and Engineers. Springer, New York, NY. https://doi.org/10.1007/978-1-4613-0103-5_4
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DOI: https://doi.org/10.1007/978-1-4613-0103-5_4
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