Patent ID: 8771484

Claim:
A device for determining one or more parameters of particles in a conductive solution, comprising: a front pool; a back pool spaced from the front pool; and a microscopic hole sensor assembly, comprising: a microscopic hole plate with a microscopic hole defined therein, the microscopic hole plate comprising an inlet on a front pool side and an outlet on a back pool side and communicating the front pool with the back pool; a first electrode and a second electrode respectively arranged in the front pool and the back pool configured for conducting an electric current between the front pool and the back pool via the conductive solution passing through the microscopic hole from the inlet to the outlet; a processing circuit connecting the first electrode and the second electrode, the processing circuit being configured for detecting the electric current or one or more changes in an electric field caused by the electric current and outputting a detection result, wherein an electrically conductive material that is a part of or is attached to the inlet forms at least a part of the first electrode and at least in part a flow-guiding surface which gradually narrows from the front pool side towards the back pool side, the outlet comprises or attaches to a fixed seat with a downstream surface gradually distending and extending towards the back pool to form an effective orifice configured for determining the one or more parameters of the particles in the microscopic hole, wherein the fixed seat, through which the particles exit the microscopic hole plate, does not support electrically conductive materials, and a first center axis of the first electrode or a second center axis of the second electrode substantially aligns with a third center axis of the microscopic hole.