Figure 4
From: Characterizing smartphone capabilities for seismic and structural monitoring
(a) Sensitivity level with different integration times measured in a bandwidth of 50 Hz. (b) Calibration curve of the EpiSensor acceleration on smartphones. (c) Sensor responses (normalized) as a function of the amplitude of the sine wave driving the woofer. (d) Frequency shift (\(\Delta f\)) between EpiSensor and smartphone..
