Tomography apparatus and method

A tomography apparatus comprising:

• a plurality of electrodes arranged around a perimeter of a cross section of a sample volume for containing a liquid or mixed-phase sample, each electrode being arranged to be in electrical contact with a sample contained in the sample volume;
• a measurement means adapted to perform a set of measurements, each measurement comprising driving a current between a first respective adjacent pair of said electrodes and measuring a voltage developed across a second respective adjacent pair of said electrodes;
• and
• a processing means adapted to generate a tomogram indicative of sample conductivity over a portion of said cross section from said set of measurements,
• wherein the set of measurements consists of no more than 50 measurements.

A tomography method comprising:

• arranging a plurality of electrodes around a perimeter of a cross section of a sample volume for containing a liquid or mixed-phase sample, each electrode being arranged to be in electrical contact with a sample contained the sample volume;
• performing a set of measurements, each measurement comprising driving a current between a first respective adjacent pair of said electrodes and measuring a voltage developed across a second respective adjacent pair of said electrodes;
• and
• generating a tomogram indicative of sample conductivity over said cross section from said set of measurements,
• wherein the method further comprises calculating sample conductivity values of a portion of said cross section from said set of measurements and generating said tomogram from said calculated sample conductivity values of said portion using an assumption of symmetry.