We measured the voltage fluctuation of the Hall-effect sensor, from which we infer the displacement sensitivity given the suspended magnet we used. The circuit for this experiment is shown in the following figure, which is a simple high-pass filtering of the sensor output.
attachment:hall_sensor_mea_config.JPG
Its transfer function is shown below with a corner frequency around 0.1 Hz.
attachment:high_pass_TF.JPG
The raw data from the spectrum analyzer by measuring different frequency bands are shown in the figure below.
attachment:Vout_rawdata.JPG