Hello all,
I'm new to the forum so I hope I'm posting this in the correct section.
I'm currently conducting an experiment in which I'm examining how the dielectric constant of a binary mixture changes with concentration and temperature using a parallel plate capacitor for measurements. The only problem, however is that the multimeter I'm using doesn't measure capacitance. Here's what I can measure:
DC volts
AC volts
DC current
AC current
Resistance
Temperature
Frequency
My advisor for this project initially suggested that I find the conductance (or conductivity?) in order to calculate the dielectric constant, however I've searched and searched but I can't seem to find a way to relate the two.
Here's what I got so far.
I know that conductivity can be used to calculate the imaginary part of the dielectric constant
\(\kappa=\epsilon^{\prime}+j\epsilon^{\prime\prime}\)
\(\kappa=\epsilon^{\prime}+j\sigma/\omega\)
where \(\kappa\) is the dielectric constant, \(\sigma\) is the conductivity and \(\omega\) is the frequency.
but I'm not sure how I would find the real part \(\epsilon^{\prime}\) in order to get \(\kappa\)
I've also got the equations
\(C=Q/V\)
\(C=\kappa\epsilon_{0}A/d\)
where \(\epsilon_{0}\) is the vacuum permittivity, \(A\) is the area of the plate and \(d\) is the distance between the plates.
Then for conductivity,
\(J=\sigma E\)
\(G=\sigma A/d\)
where \(J\) is the current density and \(G\) is the conductance
and so relating the two
\(C=\kappa\epsilon_{0}G/\sigma\)
but that still leaves me with two unknowns, \(C\) and \(\kappa\)
I feel like there's a really simple, really obvious solution that I'm just not seeing...
Can anybody help me out?
I'm new to the forum so I hope I'm posting this in the correct section.
I'm currently conducting an experiment in which I'm examining how the dielectric constant of a binary mixture changes with concentration and temperature using a parallel plate capacitor for measurements. The only problem, however is that the multimeter I'm using doesn't measure capacitance. Here's what I can measure:
DC volts
AC volts
DC current
AC current
Resistance
Temperature
Frequency
My advisor for this project initially suggested that I find the conductance (or conductivity?) in order to calculate the dielectric constant, however I've searched and searched but I can't seem to find a way to relate the two.
Here's what I got so far.
I know that conductivity can be used to calculate the imaginary part of the dielectric constant
\(\kappa=\epsilon^{\prime}+j\epsilon^{\prime\prime}\)
\(\kappa=\epsilon^{\prime}+j\sigma/\omega\)
where \(\kappa\) is the dielectric constant, \(\sigma\) is the conductivity and \(\omega\) is the frequency.
but I'm not sure how I would find the real part \(\epsilon^{\prime}\) in order to get \(\kappa\)
I've also got the equations
\(C=Q/V\)
\(C=\kappa\epsilon_{0}A/d\)
where \(\epsilon_{0}\) is the vacuum permittivity, \(A\) is the area of the plate and \(d\) is the distance between the plates.
Then for conductivity,
\(J=\sigma E\)
\(G=\sigma A/d\)
where \(J\) is the current density and \(G\) is the conductance
and so relating the two
\(C=\kappa\epsilon_{0}G/\sigma\)
but that still leaves me with two unknowns, \(C\) and \(\kappa\)
I feel like there's a really simple, really obvious solution that I'm just not seeing...
Can anybody help me out?