2 # calibcant - tools for thermally calibrating AFM cantilevers
4 # Copyright (C) 2012-2013 W. Trevor King <wking@tremily.us>
6 # This file is part of calibcant.
8 # calibcant is free software: you can redistribute it and/or modify it under
9 # the terms of the GNU General Public License as published by the Free Software
10 # Foundation, either version 3 of the License, or (at your option) any later
13 # calibcant is distributed in the hope that it will be useful, but WITHOUT ANY
14 # WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
15 # A PARTICULAR PURPOSE. See the GNU General Public License for more details.
17 # You should have received a copy of the GNU General Public License along with
18 # calibcant. If not, see <http://www.gnu.org/licenses/>.
20 """Run a cantilever calibration using the default AFM
21 (``pyafm.storage.load_afm()``).
24 import argparse as _argparse
28 from pyafm.storage import load_afm as _load_afm
30 from calibcant.calibrate import Calibrator as _Calibrator
31 import calibcant.config as _config
37 parser = _argparse.ArgumentParser(description=_module_doc)
39 '--num-bumps', type=int,
40 help='Number of surface bumps')
42 '--num-temperatures', type=int,
43 help='Number of temperature measurements')
45 '--num-vibrations', type=int,
46 help='Number of thermal vibration measurements')
48 args = parser.parse_args(args)
50 timestamp = '{0}-{1:02d}-{2:02d}T{3:02d}-{4:02d}-{5:02d}'.format(
52 filename = '{}-calibcant-data.h5'.format(timestamp)
53 config = _config.CalibrateConfig()
54 config['bump'] = _config.BumpConfig()
55 config['bump'].update(
56 {'model':_config.Linear, 'initial-position':-150e-9})
57 config['temperature'] = _config.TemperatureConfig()
58 config['vibration'] = _config.VibrationConfig()
59 if args.num_bumps is None:
60 args.num_bumps = config['num-bumps']
62 config['num-bumps'] = args.num_bumps
63 if args.num_temperatures is None:
64 args.num_temperatures = config['num-temperatures']
66 config['num-temperatures'] = args.num_temperatures
67 if args.num_vibrations is None:
68 args.num_vibrations = config['num-vibrations']
70 config['num-vibrations'] = args.num_vibrations
71 insufficient_calibration_data = 0 in [
72 args.num_bumps, args.num_temperatures, args.num_vibrations]
76 afm.load_from_config(devices=devices)
77 calibrator = _Calibrator(config=config, afm=afm)
78 calibrator.setup_config()
79 deflection = afm.piezo.read_deflection()
81 position,deflection = afm.stepper_approach(
82 target_deflection=deflection + 1e3, record_data=True)
83 with _h5py.File(filename) as f:
84 f['/approach/position'] = position
85 f['/approach/deflection'] = deflection
86 if insufficient_calibration_data:
87 data = calibrator.acquire(filename=filename)
89 k,k_s,data = calibrator.calibrate(filename=filename)
91 afm.move_away_from_surface()
95 for device in devices:
97 if insufficient_calibration_data:
98 for count,field,label in [
99 (args.num_bumps, 'bump', 'photodiode sensitivity (V/m)'),
100 (args.num_temperatures, 'temperature', 'temperature (K)'),
101 (args.num_vibrations, 'vibration', 'variance (V**2)')]:
104 print('{}: {:g} +/- {:g}'.format(label, d.mean(), d.std()))
106 print('k: {:g} +/- {:g}'.format(k, k_s))
109 if __name__ == '__main__':
112 sys.exit(main(sys.argv[1:]))