Hi,
I'm currently working on creating an array of strain gauges / gages. Currently I have a single strain gauge sensor working away happily as in the first picture attached (apologies for the terrible drawings..). Due to the small signal of the sensor, amplification is required before passing the signal to a DAQ card connected to a PC
The amplifier portion of this is a strain guage amp circuit from RS set to a gain of 1000 and the output goes to a DAQ card (NI USB-6008) connected to my PC.
From this initial design, I wish to expand this into an array of (initially 2x2) strain gauges. The quickest way to do this would be to have a separate amp for each sensor but as I'm trying to keep things small (and cheap!) this isn't feasible.
My next thought is therefore to somehow multiplex the Bridge Supply from the amp circuit to each different strain gauge in the array.
Not being amazingly confident in my theory here, I would like to know if this would be possible? and what kind of hardware would be recommended?
As you can see in the second pic, I'm thinking there'll be some timing issues involved; I need to somehow tell the DAQ card / Labview which signal belongs to which sensor but am unsure how to go about this / if it's even possible. the DAQ card has multiple digital and analogue inputs which I can utilise.
Any ideas / thoughts / criticisms would be greatly appreciated!
(Also, this is for a university project, I hope this is the correct forum for this.)
Olaf
I'm currently working on creating an array of strain gauges / gages. Currently I have a single strain gauge sensor working away happily as in the first picture attached (apologies for the terrible drawings..). Due to the small signal of the sensor, amplification is required before passing the signal to a DAQ card connected to a PC
The amplifier portion of this is a strain guage amp circuit from RS set to a gain of 1000 and the output goes to a DAQ card (NI USB-6008) connected to my PC.
From this initial design, I wish to expand this into an array of (initially 2x2) strain gauges. The quickest way to do this would be to have a separate amp for each sensor but as I'm trying to keep things small (and cheap!) this isn't feasible.
My next thought is therefore to somehow multiplex the Bridge Supply from the amp circuit to each different strain gauge in the array.
Not being amazingly confident in my theory here, I would like to know if this would be possible? and what kind of hardware would be recommended?
As you can see in the second pic, I'm thinking there'll be some timing issues involved; I need to somehow tell the DAQ card / Labview which signal belongs to which sensor but am unsure how to go about this / if it's even possible. the DAQ card has multiple digital and analogue inputs which I can utilise.
Any ideas / thoughts / criticisms would be greatly appreciated!
(Also, this is for a university project, I hope this is the correct forum for this.)
Olaf
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