public double get_raw_acc_combined(Upload_and_Segment_Images_Thread.DeviceType device_type)
 {
     return(Math.Sqrt(Standard_Calculation.square_value(Standard_Calculation.get_signed_int(acc_x, device_type))
                      + Standard_Calculation.square_value(Standard_Calculation.get_signed_int(acc_y, device_type))
                      + Standard_Calculation.square_value(Standard_Calculation.get_signed_int(acc_z, device_type))));
 } //end method get_raw_acc_combined()