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An unmounted resistive foil strain gauge. A strain gauge takes advantage of the physical property of electrical conductance and its dependence on the conductor's geometry. . When an electrical conductor is stretched within the limits of its elasticity such that it does not break or permanently deform, it will become narrower and longer, which increases its electrical resistance end-to-
A strain gauge sensor measures the deformation of the elastic element, and the output of the sensor is converted by an electronic circuit to a signal that represents the load. Capacitive strain gauges measure the deformation of the elastic material using the change in capacitance of two plates as the plates move closer to each other.
Link to product datasheet: ... #83 — High-Resistance Miniature Foil Strain Gages. High precision foil strain gages are at the heart of many types of transducers types. VPG's high-resistance ...
Gauge factor (GF) or strain factor of a strain gauge is the ratio of relative change in electrical resistance R, to the mechanical strain ε. The gauge factor is defined as: [ 1 ] G F = Δ R / R Δ L / L = Δ R / R ε = 1 + 2 ν + Δ ρ / ρ ε {\displaystyle GF={\frac {\Delta R/R}{\Delta L/L}}={\frac {\Delta R/R}{\varepsilon }}=1+2\nu +{\frac ...
The strain resistor is bonded with adhesive to an object that is subjected to mechanical strain. With the strain gauge and a filter, amplifier, and analog/digital converter, the strain on an object can be measured. A related but more recent invention uses a Quantum Tunnelling Composite to sense mechanical stress.
Wheatstone bridge circuit diagram.The unknown resistance R x is to be measured; resistances R 1, R 2 and R 3 are known, where R 2 is adjustable. When the measured voltage V G is 0, both legs have equal voltage ratios: R 2 /R 1 = R x /R 3 and R x = R 3 R 2 /R 1.
Constantan in this form is very ductile; and, in gauge lengths of 0.125 inches (3.2 mm) and longer, can be strained to >20%. It should be borne in mind, however, that under high cyclic strains the P alloy will exhibit some permanent resistivity change with each cycle, and cause a corresponding zero shift in the strain gauge. Because of this ...
Though the Simmons was the first to invent the resistance wire strain gauge, both men are credited with the discovery and share the original patent. The trade name of the device, SR-4, which stands for “Simmons Ruge – 4 people,” acknowledges both men and indicates that four people (Simmons, Ruge and their respective assistants) were ...