First device in practical examples - sensor for measuring level of a liquid.
Every liquid need to be measured: from liquids in medical life-saving devices and fuel in plane you fly, to refrigerant fluid in industry scaled fridges at food plant and oil in tanks.
Best way to detect fill level of non-conductive (and conductive also) liquids is using it as dielectric in kind of electrical capacitor, combined of two plates, (in most cases, cylindrical) with gas gap between.
More about: what-is-level-sensor on engineersgarage.com
Effective dielectric constant describes permittivity of liquid
" permittivity relates to a material's ability to transmit (or "permit") an electric field "
Most gases had low dielectric permittivity, instead of liquids, and quantity of liquid in gas gap noticeably rises capacitance. Just measure this, thats all.
Industry very interested in this type of sensors. It not only suitable for liquids itself: this way accurate also on liquid foam, and even in cases were needs to know quantity of liquid in substances (e.g. water in soil).
One or both of plates can be isolated, to avoid resistive loses or to protect plates from chemicals. Or both of them can be leaved non-isolated, if sensor uses in additional resistive measuring. For instance: detecting water in gasoline or salt in water.
Link to some other similar projects :
Capacitive Liquid Level Sensor on mudventions.com
Liquid Level Sensing is Key Technology for Today’s Systems on digikey.com
Every liquid need to be measured: from liquids in medical life-saving devices and fuel in plane you fly, to refrigerant fluid in industry scaled fridges at food plant and oil in tanks.
Best way to detect fill level of non-conductive (and conductive also) liquids is using it as dielectric in kind of electrical capacitor, combined of two plates, (in most cases, cylindrical) with gas gap between.
Video How Capacitive Liquid Level Sensors Work from GillSensors
Effective dielectric constant describes permittivity of liquid
" permittivity relates to a material's ability to transmit (or "permit") an electric field "
Most gases had low dielectric permittivity, instead of liquids, and quantity of liquid in gas gap noticeably rises capacitance. Just measure this, thats all.
Industry very interested in this type of sensors. It not only suitable for liquids itself: this way accurate also on liquid foam, and even in cases were needs to know quantity of liquid in substances (e.g. water in soil).
One or both of plates can be isolated, to avoid resistive loses or to protect plates from chemicals. Or both of them can be leaved non-isolated, if sensor uses in additional resistive measuring. For instance: detecting water in gasoline or salt in water.
Capacitive Liquid Level Sensor on mudventions.com
Liquid Level Sensing is Key Technology for Today’s Systems on digikey.com
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