A METHOD FOR CALIBRATING A TRANSFER FUNCTION OF A MAGNETIC SENSOR

摘要

A method for calibrating a transfer function of a magnetic sensor (MS) on a substrate (SBSTR) in which sensor (MS) the presence of magnetizable objects (SPB) can be detected by magnetizing the objects (SPB) by a magnetic field (H) delivered by a magnetic field generator (WR₁, WR₂) and in which the transfer function is defined as the transfer from an electrical input signal (I_in) for generating the magnet field H, via magnetic stray field (SF) radiated by the objects (SPB) when magnetized, to an electrical output signal (I_out) delivered by the sensor (MS), comprising the steps of: - putting sample fluid on the substrate (SBSTR), the sample fluid comprising a large amount of the magnetizable objects (SPB), - attracting part of the magnetizable objects (SPB) towards the magnetic sensor (MS), - activating the electrical input signal (I_in), thereby generating the magnet field (H), - measuring the electrical output signal (I_out) as a response to the electrical input signal (I_in), - calculating the transfer function from the electrical input and output signals (I_in, l_out); and a magnetic sensor (MS) on a substrate (SBSTR) in which the presence of magnetizable objects (SPB) can be detected, and presented by an electrical output signal (l_out), by magnetizing the objects (SPB) by a magnetic field (H) delivered by a magnetic field generator (WR₁; WR₂), comprising calibration means for calibrating a transfer function which is defined as the transfer from an electrical input signal (I_in) for generating the magnet field (H), via magnetic stray field (SF) radiated by the objects (SPB) when magnetized, to the electrical output signal (I_out), for executing the method.