Changes between Initial Version and Version 1 of calibrate_bias_currents


Ignore:
Timestamp:
06/29/15 17:01:20 (10 years ago)
Author:
dneise
Comment:

--

Legend:

Unmodified
Added
Removed
Modified

  • calibrate_bias_currents

    v1 v1  
     1We wanted to have a look at the SiPM currents over all of FACTs lifetime.
     2The aux files containing the calibrated currents (FEEDBACK_CALIBRATED_CURRENTS.fits) only exist since 9th august 2013, so they were out of question.
     3We needed to look at the BIAS_CONTROL_CURRENT.fits files and do the current calibration ourselves.
     4
     5I mean, the calibration constants were already there, we just needed to apply them to the uncalibrated data,
     6but how exactly this is done, I was not able to find. So I reverse engineered it with the data of yesterday night
     7and wrote it down here.
     8
     9---
     10
     11I write it here in pseudo-python:
     12
     13   fb_cal_r8 = fits.open('20150628.FEEDBACK_CALIBRATION_R8.fits')[1].data
     14   delta_i = fb_cal_r8['DeltaI'][0, :320]
     15   r8 = fb_cal_r8['R8'][0, :320]
     16
     17   bias_cur = fits.open('20150628.BIAS_CONTROL_CURRENT.fits')[1].data
     18   bias_dac = fits.open('20150628.BIAS_CONTROL_DAC.fits')[1].data
     19   I8 = bias_cur['I'][:, :320] * 5e-3/4096. - delta_i[np.newaxis, :]
     20   I9 = bias_dac['U'][:, :320] * (1e-3/4096) * 100 / r8[np.newaxis, :]
     21   Iout = (I8 - I9) / 4e-6