DYNAMIC RECIPROCATING-BOB RHEOMETRY

摘要

A sensor for making rheological measurements takes the form of a ferromag netic bob alternately driven through a sample fluid in opposite directions b y magnetic force from two alternately driven coils. The bob's position affec ts the mutual inductance between the coils, so it can be inferred by sensing the signal that current flowing in one coil induces in the other, and rheol ogical properties are determined from the relationships among the bob's moti on, the coil current, and the sensor geometry. Some such measurements' accur acies are enhanced by computing bob acceleration and suppressing iner-tial e ffects thereby detected.