Fluid sensing

Hello,

If there is a propeller inside the pipe, LDC can be used to detect the blades, then you can calculate the speed of rotation, and get the flow speed.

Water in oil might be possible, but we need to learn more about the app. How big is the container? What is it made of? how close can the coil be to the bottom etc.

Hello Dr. Fomin,

If the fluid flow is through a non-metalic pipe (i.e., medium or high density polyethylene), and the fluid contains ions, could not Faraday's Law of Electromagnetic Induction be used to measure the "disruption" of the generated field to derive the fluid flow?

Maurice Givens

Hello Maurice,

Indeed, if the ions are present in the fluid, they will make it conductive. Concentration of the ions can be measured with LDC.

However, you would like to measure the flow velocity, correct?

That is correct. Using E = V x B x D, a voltage proportional to the velocity of the conductor through the magnetic field can be sensed. The conductor, in this case, is the conductive fluid.

Hello Maurice,

What you are describing is a magnetic flow meter. LDC1000 is another type of device - it is measuring changes in the sensor inductance and energy losses. It does not measure EMF.

You still can use LDC1000 for your application, if you add an impeller with conductive blades into the pipe. Flow of liquid will turn it, LDC will detect the blades. Will such approach work for you?

Hi Evgeny,

So are you saying that LDC can detect the presence of the conductive liquid but not it's velocity directly?

In my application I am looking for velocity but not constrained within a pipe so the impeller is not practical, are there other techniques with LDC?