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I have a conductive elastic polymer which gives the resistance change of 800 Kohm with the input strain of 250%. and also gives linear response when the force is applied. I wanted to have a signal conditioning circuit which can measure the force range in the range of 0 to 45 gm. how can i start designing the signal conditioning.? Thank You.

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  • \$\begingroup\$ Please provide a link to the polymer and show how you are going to make connections to it. \$\endgroup\$ – Andy aka Dec 13 '16 at 9:18
  • \$\begingroup\$ its CNT conductive polymer. I have attached the both end of the polymer sample to the copper electrode. It shows the creep behavior every time but gives the approximate resistance change for same strain. so far I have prepared the signal conditioning, by having the voltage divider circuit and what could be the next step after that to have the output voltage in the range of 0-5 v. \$\endgroup\$ – Parth Bhimani Dec 14 '16 at 14:17
  • \$\begingroup\$ vb9uhg-bn1306.files.1drv.com/… \$\endgroup\$ – Parth Bhimani Dec 19 '16 at 13:16
  • \$\begingroup\$ sr9uhg-bn1306.files.1drv.com/… \$\endgroup\$ – Parth Bhimani Dec 19 '16 at 13:17
  • \$\begingroup\$ @Andyaka I have provide the link of the sensor and its behavior. I wanted to have the signal conditioning circuit which gives the voltage output in the range of 0 to 5 volts regards to the strain input of 25 %. \$\endgroup\$ – Parth Bhimani Dec 19 '16 at 13:18
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You will likely need to use an instrumentation amplifier (TI, ADI, LT are all suppliers of such devices) and operate your polymer in a wheatstone bridge configuration with a stable excitation voltage. Here's a typical idea: -

enter image description here

You should also consider reading this article

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  • \$\begingroup\$ I see you have moved on from this question and answer. If this answer proved useful then please consider formally accepting it. \$\endgroup\$ – Andy aka Dec 21 '16 at 17:02

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