SUBSTANCE DETERMINING APPARATUS

摘要

The invention relates to a substance determining apparatus for determining a substance within a fluid. Particles, which have attached the substance, are bound to a binding surface (30). A sensing unit (33) is adapted to generate a sensing signal being indicative of at least one of i) a distance between the particles bound on the binding surface (30) and the binding surface (30) and ii) an in-plane position of the particles bound on the binding surface. A binding discrimination unit (34) is adapted to discriminate between different kinds of binding of the particles bound on the binding surface (30) depending on the generated sensing signal. The binding discrimination unit (34) is preferentially a unit for determining the part of the sensing signal being caused by specifically bound particles and to determine the substance based on this determined part of the sensing signal.