In this paper new void fraction sensors and their characteristics are
presented. The signal part of the sensor is a volume with a highly uni
form electric field within it. Applicable fluids include cryogens, wat
er, liquefied natural gas and oil. The sensors are also able to identi
fy mineral particles in such media. Modification of the sensor for mea
surement of the moisture content of components for the porcelain indus
try is demonstrated.