Cell for measurement of dielectric permittivity of solutions

Abstract

The cell for measurement of dielectric permittivity is intended for research of properties of water solutions in the range of temperatures from 0 to 70°C in a range of frequencies of 30–40 GHz. The simplified construction of a cell is presented on Fig.1. The cell consists of the camera for solution and insert. The camera for a solution consists from waveguide flange with a segment of a circular waveguide 1, capacities for a solution 2, insert for the thermometer 3 with an entry branch pipe for flood filling of a solution, an output branch pipe for change of a solution 4. The segment of a circular waveguide has round deepening for glass tight laying from side capacities for a solution. The insert consists from waveguide a flange with a segment of a circular waveguide 5 and tanks 6 with a cylindrical part. The tank has round deepening for glass tight laying from side capacities for a solution also. Glass tight layings are pasted compound glue. The camera and an insert are made of stainless steel and incorporate by screws. Laying from high-temperature moisture resistant rubber is allocated between the camera and an insert for hermetic connection. The camera and insert have plane side surfaces. Heating units are attached to these surfaces by means of slices. The heating unit represents twelve ceramic resistances (on six cells from each side) with admissible power of 10 Watt everyone and with rating value of 72 Ohm. Resistances are connected in a parallel way. For cell heating the heating unit was connected to an alternating voltage source which regulated a range from 5 to 10 Volt so that speed of heating of a solution in a cell was no more than one degree for two minutes.