Brief introduction of strain gauges - Part 1

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In this video I briefly talk about strain gauges in general. I tell you why and how we use them, and I tell you how we can obtain usable values using them. The principle is relatively simple. Instead of trying to measure the very small changes in the resistance values of the strain gauge upon straining it, we put the strain gauge into a Wheatstone-bridge and convert the resistance change into a voltage change. It is much more easier to measure small changes in voltage. I provide a small summary for this and I also provide a simple formula for converting the output voltage of the bridge into strain.

  1. Curious Scientist
  2. strain
  3. strain gage
  4. straing gauge
  5. gauge
  6. gage
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*PLZ HELP*. Given a pressure of 2kpa, nominal resistance of 120 ohm, diameter of strain gauge 0.1mm, a GF of 2. What will be the change in resistance value of the strain gauge?....in short I wanta formula to calculate the change in resistance of strain gauge for a given INPUT PRESSURE

ram.
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What a great video. But can you help me, i'm newbie here. In this formulation you did not include op amp multification, right? So before calculating ratio unstrained vs strained voltages, it needs to divide with op amp, is it right? Sorry for bad englsih

PascalRachman
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You lost me at the derivation of delta Rg/Rg. I understand that Vin is the same during strained and unstrained so we can have Vr = (Vout during strained - Vout during unstrained)/Vin. But beyond this point nothing makes sense.

henry