Displacement measurements of the open-hardware sandbox using the AS5311 high-resolution magnetic sensor

This dataset includes the experimental data from the AS5311 sensor for measuring the displacement of the Open-Hardware Geological Sandbox.

These experiments are explained in the journal article: Designing low-cost open-hardware electromechanical scientific equipment: A geological analogue modeling sandbox

To understand this dataset, go to the Tectonic Open Hardware (TectOH) Sandbox project: https://github.com/URJCMakerGroup/TectOH. Then go to the optional folder and to the magnetic sensor folder.

This data set contains two kind of files:

• bin: raw binary files received from the AS5311 high resolution sensor. Although this sensor sends 12 bit data, we have truncated the most significant bits and receive only 8 bits (one byte). Therefore, each byte of these binary files is a measurement of the distance. Each distance increment corresponds to ~0.488nm (2mm/2048)
• csv: csv files that can be opened with any spreadsheet app, such as Libreoffice Calc or Microsoft Excel, or even with a text editor. This file contains the processed data from the binary files. These files have been generated with the proc_magn_sensor.py Python script located in the project repository. There are some columns, which are:
  • index: measurement number
  • time in milliseconds: each measurement is taken every 250 us
  • median2: in micrometers, since the sensor may jitter, we have applied the median filter twice. All the data has been subtracted to the lowest value, making the lowest value equal to zero.
  • median1: in micrometers, median filter only applied once. All the data has been subtracted to the lowest value, making the lowest value equal to zero.
  • mean: in micrometers, mean filter. All the data has been subtracted to the lowest value, making the lowest value equal to zero.
  • mean int: in micrometers, mean filter rounded to an integer value. All the data has been subtracted to the lowest value, making the lowest value equal to zero.
  • orig_base: this is not in micrometers, but in the units of the sensor (~0.488nm). The only processing done is that when there is an overflow of 255 to 0, or from 0 to 255, it adds the overflow to continue the trend. All the data has been subtracted to the lowest value, making the lowest value equal to zero.
  • original: this is the data received from the sensor with no processing, each value is ~0.488nm
  • mean2: in micrometers, mean filter applied twice. All the data has been subtracted to the lowest value, making the lowest value equal to zero.

There are two set of experiments:

• Experiments with no load. These files start with noload_
  In these experiments the gantry is moved 1 mm alternatively to the front and then reversing direction. Moving in this alternate way a few times. There are five experiments each of them with a different speed: v= 10 mm/h; 25 mm/h; 50 mm/h; 82 mm/h and 100 mm/h. The name of the file indicates the speed:
  1. noload_100mmh_1mm: FBFBF: 1mm forth, 1mm back, 1mm forth, 1mm back, 1 mm forth
  2. noload_25mmh_1mm: FBFFBBFB
  3. noload_50mmh_1mm: FBFBFB
  4. noload_82mmh_1mm: FBFBFB
  5. noload_100mmh_1mm: FBFBFB
• Experiments pushing a 5kg sand load. These files start with load5kg_
  1. load5kg_25mmh_5mm: moving 5kg at 25mm/h a distance of 5mm
  2. load5kg_25mmh_10mm: moving 5kg at 25mm/h a distance of 10mm
  3. load5kg_25mmh_20mm: moving 5kg at 25mm/h a distance of 20mm
  4. load5kg_75mmh_20mm: moving 5kg at 75mm/h a distance of 20mm
  5. load5kg_75mmh_50mm: moving 5kg at 75mm/h a distance of 50mm
  6. load5kg_100mmh_25mm: moving 5kg at 100mm/h a distance of 20mm
  7. load5kg_100mmh_50mm: moving 5kg at 100mm/h a distance of 50mm