Quarter Bridge three lead strain gauge

Thread Starter

mikael.abdellah

Joined Jan 21, 2013
1
I am tinkering with an idea...

I would like to build a simple device for measuring very short short expansions in a metal object. A 12 bit resolution is enough and the only thing I need to see is the PEAK value.

I want a strain gauge with a three wire connection to a wheatstone bridge connected to some kind of suitable instrumentation amplifier and the feed the signal to a fairly high speed ADC.

I can't find any recommendations on resistor values for the bridge. The strain gauge is a 120 ohm manganin gauge.

Any ideas how to choose the optimum resistor values and also how to extract the peak value from the signal???
 
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