Patent ID: 8829893
Filing Date: 2014-09-09
Classification: G01D

Abstract:
1. An apparatus comprising: a housing; a piston including first and second end surfaces, wherein the piston is cylindrical, wherein the piston is disposed within the housing, and wherein the piston is operable to move reciprocally within the housing; one or more magnets operably coupled to the piston, wherein the one or more magnets are disposed radial or tangential to the circumference of a first end surface or a second end surface of the piston; a plurality of sensors disposed on an exterior of the housing and configured to sense a magnetic field produced by the one or more magnets to determine a position of the piston within the housing; and a calibration module configured to calibrate the plurality of sensors to produce normalized output from the plurality of sensors, wherein to normalize output of the plurality of sensors, each sensor's output is scaled based on an actual minimum value and an actual maximum value output by each sensor.