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| mat86... |
 Posted: Thu Oct 29, 2009 1:00 am |
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Hello
I need to create a capacitive sensor with two sensing probes. How do i
calculate the capacitance needed for my sensing???
Thanks |
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| whit3rd... |
| Posted: Thu Oct 29, 2009 11:55 am |
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On Oct 29, 4:00 am, mat86 <mathew... at (no spam) yahoo.de> wrote:
[quote]I need to create a capacitive sensor with two sensing probes. How do i
calculate the capacitance needed for my sensing???
[/quote]
Either apply Maxwell's equations and the materials-specific
response equations and do a 3-d solution of the electric field
everywhere,
squaring and integrating over all space to determine stored energy,
or find someone who knows a dozen crufty approximations
and can get it good enough. Or, build something that looks kinda
right, and determine the capacitance by measurement. |
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| George Herold... |
| Posted: Thu Oct 29, 2009 3:53 pm |
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Guest
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On Oct 29, 5:55 pm, whit3rd <whit... at (no spam) gmail.com> wrote:
[quote]On Oct 29, 4:00 am, mat86 <mathew... at (no spam) yahoo.de> wrote:
I need to create a capacitive sensor with two sensing probes. How do i
calculate the capacitance needed for my sensing???
Either apply Maxwell's equations and the materials-specific
response equations and do a 3-d solution of the electric field
everywhere,
squaring and integrating over all space to determine stored energy,
or find someone who knows a dozen crufty approximations
and can get it good enough. Or, build something that looks kinda
right, and determine the capacitance by measurement.
[/quote]
I like the guesstimate, then measurement approach.
George H. |
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