Strain Gauge

Deformation sensor

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  • Library:

  • Simscape / Electrical / Sensors & Transducers

  • Strain Gauge block

Description

The Strain Gauge block represents a sensor that generates a change in resistance as a function of strain using the following equation:

ΔRR=Kε

where:

  • ΔR/R is the fractional change in resistance.

  • ε is the strain at port E.

  • K is the Gauge factor parameter value.

Ports

Input

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Physical signal port associated with the strain input.

Conserving

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Electrical conserving port associated with the strain gauge positive port.

Electrical conserving port associated with the strain gauge negative port.

Parameters

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Unstressed gauge resistance.

The ratio K of the fractional change in resistance to the fractional change in length.

Model Examples

Strain Gauge and Wheatstone Bridge

Strain Gauge and Wheatstone Bridge

How to model a strain gauge and measurement amplifier. The strain gauge forms one leg of a Wheatstone bridge, which is connected to a differential amplifier. A second op-amp is then used to both amplify and apply a low-pass filter to the measurement signal. The op-amps are modeled at a system level, with the user specifying parameters such as open-loop bandwidth, gain and maximum slew rate. In this circuit, the dynamics are primarily set by the low-pass filter. The op-amp bandwidth and maximum slew rate have little impact on the step response.

Extended Capabilities

C/C++ Code Generation
Generate C and C++ code using Simulink® Coder™.

See Also

Introduced in R2008a

Simscape Electrical Documentation

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