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Need help measuring voltage difference between two points
Posted Dec 10, 2015, 4:07 p.m. EST Version 5.1 1 Reply
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Hello,
I am new to COMSOL, so I'm sure this question is a basic one. I am using COMSOL to model current within a spherical body of fluid. Basically, we are trying to utilize conductance to measure the volume of a body of fluid, similar to cardiac catheters. I have defined two point probes, between which I would like to measure the voltage difference. I want to see how this voltage difference changes as the diameter of the sphere increases from 12cm to 12.5 cm (the maximum diameter we anticipate); to do this, I have my model perform a parameter sweep between 12 and 12.5cm diameter. Additionally, my model performs a parameter sweep through 10 different electrode separation distances. I would like to see how the electrode separation affects the change in voltage difference between 12 and 12.5 cm diameter. Ideally, I would like my model to output a 2D plot with change in voltage difference between 12 and 12.5 cm diameter on the y-axis and electrode separation distance on the x-axis. I'm sure this is not too complicated, but I haven't been able to find a solution on line for some reason. Thanks for any help!
I am new to COMSOL, so I'm sure this question is a basic one. I am using COMSOL to model current within a spherical body of fluid. Basically, we are trying to utilize conductance to measure the volume of a body of fluid, similar to cardiac catheters. I have defined two point probes, between which I would like to measure the voltage difference. I want to see how this voltage difference changes as the diameter of the sphere increases from 12cm to 12.5 cm (the maximum diameter we anticipate); to do this, I have my model perform a parameter sweep between 12 and 12.5cm diameter. Additionally, my model performs a parameter sweep through 10 different electrode separation distances. I would like to see how the electrode separation affects the change in voltage difference between 12 and 12.5 cm diameter. Ideally, I would like my model to output a 2D plot with change in voltage difference between 12 and 12.5 cm diameter on the y-axis and electrode separation distance on the x-axis. I'm sure this is not too complicated, but I haven't been able to find a solution on line for some reason. Thanks for any help!
1 Reply Last Post Dec 11, 2015, 8:14 a.m. EST
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Posted:
9 years ago
Hello Calvin,
The attached file is a toy model that shows how to do this. I use two parametric sweeps to change the geometry, a couple of component couplings to pick up the values of the potential at two points, a derived value node to evaluate an expression that depends on those component couplings into a table and the Table Surface button for that table to turn its contents into a plot (I added a Height Expression node to give that plot a cool 3D look).
Please note that I use the current version, 5.2, so you will need to update your installation to open my file.
Best regards,
Jeff
The attached file is a toy model that shows how to do this. I use two parametric sweeps to change the geometry, a couple of component couplings to pick up the values of the potential at two points, a derived value node to evaluate an expression that depends on those component couplings into a table and the Table Surface button for that table to turn its contents into a plot (I added a Height Expression node to give that plot a cool 3D look).
Please note that I use the current version, 5.2, so you will need to update your installation to open my file.
Best regards,
Jeff
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