Calibration And Observation In IMaX
-
Upload
mellado-pablo -
Category
Technology
-
view
339 -
download
1
Transcript of Calibration And Observation In IMaX
![Page 1: Calibration And Observation In IMaX](https://reader033.fdocuments.us/reader033/viewer/2022042521/558d4f9ad8b42a9b5e8b4690/html5/thumbnails/1.jpg)
IMaX: Calibrations and Observations
The software's point of view
![Page 2: Calibration And Observation In IMaX](https://reader033.fdocuments.us/reader033/viewer/2022042521/558d4f9ad8b42a9b5e8b4690/html5/thumbnails/2.jpg)
Calibrations and Observations
● Exposure Time● Focus● Wavelenghts● Phase diversity● Flat field● Dark current
● Standard Observing Modes (OM)
– VS, VM– LS, LM– DM
● New OM– V3, V5, V6, V7,
V12– L3, L5, L6, L7,
L12
![Page 3: Calibration And Observation In IMaX](https://reader033.fdocuments.us/reader033/viewer/2022042521/558d4f9ad8b42a9b5e8b4690/html5/thumbnails/3.jpg)
Calibrating: Exposure Time
● It acquires six images with increasing exposure time.
● It calculates the average for every image (centered square 500x500) and ignores the ones with an average over 85% of the max value for a pixel.
● It adjusts a line with the rest of the points and takes the value corresponding to 2500 counts.
![Page 4: Calibration And Observation In IMaX](https://reader033.fdocuments.us/reader033/viewer/2022042521/558d4f9ad8b42a9b5e8b4690/html5/thumbnails/4.jpg)
Calibrating: Exposure Time● Use of “CalibrateExposureTime” DECO.● This DECO takes six different times (in
milliseconds) as parameters.● It sets the Etalon voltage to the 5th of the VS OM.● It needs the dark current image.● It calibrates both cameras.● It updates CF (HD & Mem).
ImageAcquisition.Camera_1_ExposureTime & ImageAcquisition.Camera_2_ExposureTime
![Page 5: Calibration And Observation In IMaX](https://reader033.fdocuments.us/reader033/viewer/2022042521/558d4f9ad8b42a9b5e8b4690/html5/thumbnails/5.jpg)
Calibrating: Focus
● It takes a single image and calculates RMS for a centered square (500x500).
● RMS:
RMS= standard deviationaverage
![Page 6: Calibration And Observation In IMaX](https://reader033.fdocuments.us/reader033/viewer/2022042521/558d4f9ad8b42a9b5e8b4690/html5/thumbnails/6.jpg)
Calibrating: Focus
● Use of TC “CalculateContrast”. Long duration & low priority.
● Process coordinated by the ICU.● It just uses camera 1.● It needs dark current and flat field image.● It sets the Etalon voltage to the 5th of the VS
OM.● It sends a HK with the calculated contrast.
![Page 7: Calibration And Observation In IMaX](https://reader033.fdocuments.us/reader033/viewer/2022042521/558d4f9ad8b42a9b5e8b4690/html5/thumbnails/7.jpg)
Calibrating: Wavelengths
● It takes images with increasing wavelength values.
● It calculates an average for every image in a centered square(50x50). It takes the minimum average and two from every side. It adjusts a parabola for these five points. The minimum of the parabola allows us to obtain the offset of the line ('a').
λ=a+bV● This way we can obtain the new voltages for
the Observing Modes.
![Page 8: Calibration And Observation In IMaX](https://reader033.fdocuments.us/reader033/viewer/2022042521/558d4f9ad8b42a9b5e8b4690/html5/thumbnails/8.jpg)
Calibrating: Wavelengths
● Use of CalibrateWavelengths DECO.● It takes v0, v1 and vdelta as parameters.● It needs flat field and dark current images.● It just uses camera 1.● It calculates the new 'a' coefficient and writes
it to the CF (HD & Mem).● It recalculates the new CF voltages to all the
OM with the new 'a' coefficient and writes it to the CF (HD & Mem).
![Page 9: Calibration And Observation In IMaX](https://reader033.fdocuments.us/reader033/viewer/2022042521/558d4f9ad8b42a9b5e8b4690/html5/thumbnails/9.jpg)
Calibrating: File names
● The images used for calibration are stored in the ICU DSS.
● cal_exp_cam_x_n_y.raw, where x is the camera and y is the exposure time argument number.
● cal_focus_cam_1_n_x.raw, where x is an increasing counter of the focus calibration carried out.
● cal_lambda_v_x.raw, where x is the voltage in counts.
![Page 10: Calibration And Observation In IMaX](https://reader033.fdocuments.us/reader033/viewer/2022042521/558d4f9ad8b42a9b5e8b4690/html5/thumbnails/10.jpg)
Calibrating: Phase Diversity
● It sets the Etalon voltage to the 5th of the VS OM.● It sets ROCLIs to p1 of the VS OM.● Accumulation?● Truncation bits: 0● No demodulation● It sets the PD at the beginning and unset at the
end.
![Page 11: Calibration And Observation In IMaX](https://reader033.fdocuments.us/reader033/viewer/2022042521/558d4f9ad8b42a9b5e8b4690/html5/thumbnails/11.jpg)
Calibrating: Dark current & flat field
● Provided by the scientist team as raw images during AIV in Esrange.
![Page 12: Calibration And Observation In IMaX](https://reader033.fdocuments.us/reader033/viewer/2022042521/558d4f9ad8b42a9b5e8b4690/html5/thumbnails/12.jpg)
Former Observing Modes
● The former observing modes takes the the following parameters from the CF.
● Grouped by OM (VS, VM, LS, LM & DM):– Iddle time– Discarded frames– Accumulations– Truncation bits– Demodulate– Etalon voltages– ROCLI voltages
![Page 13: Calibration And Observation In IMaX](https://reader033.fdocuments.us/reader033/viewer/2022042521/558d4f9ad8b42a9b5e8b4690/html5/thumbnails/13.jpg)
Former Observing Modes
● Grouped by tuning mode (FPTM, ITM, DMM) and Camera
– Demodulation matrix● All of them have only one:
– Camera 1 exposure time– Camera 2 exposure time– Max observing time– Max number of cycles– Max time to enter science mode– Lambda to voltage function coefficients
![Page 14: Calibration And Observation In IMaX](https://reader033.fdocuments.us/reader033/viewer/2022042521/558d4f9ad8b42a9b5e8b4690/html5/thumbnails/14.jpg)
New Observing Modes● All of them use the Configurable mode for (including
V3, V5, L3 and L5):– Iddle time– Discarded frames– Accumulations– Truncation bits– Demodulate– Etalon voltages– ROCLI voltages
![Page 15: Calibration And Observation In IMaX](https://reader033.fdocuments.us/reader033/viewer/2022042521/558d4f9ad8b42a9b5e8b4690/html5/thumbnails/15.jpg)
New Observing Modes
● V3, V5, V6, V7and V12 use FPTM demodulation matrix
● L3, L5, L6, L7 and L12 use ITM demodulation matrix
● All of them have only one (same as former):– Camera 1 and camera 2 exposure time– Max observing time– Max number of cycles– Max time to enter science mode– Lambda to voltage function coefficients
![Page 16: Calibration And Observation In IMaX](https://reader033.fdocuments.us/reader033/viewer/2022042521/558d4f9ad8b42a9b5e8b4690/html5/thumbnails/16.jpg)
New Observing Modes
● Due to timing restrictions, all of them use FPTM tuning mode.
● Wavelengths are fixed and translated to voltages at the beginning of the execution with the 'a' and 'b' coefficients from the CF.
● For the V# OM, the ROCLI retardances(number of retardances and values) and truncation bits are copied from the Vector Spectropolarimeter OM values. The demodulation matrix applied are the ones for the FPTM.
![Page 17: Calibration And Observation In IMaX](https://reader033.fdocuments.us/reader033/viewer/2022042521/558d4f9ad8b42a9b5e8b4690/html5/thumbnails/17.jpg)
![Page 18: Calibration And Observation In IMaX](https://reader033.fdocuments.us/reader033/viewer/2022042521/558d4f9ad8b42a9b5e8b4690/html5/thumbnails/18.jpg)
New Observing Modes
● For the L# OM, the ROCLI retardances(number of retardances and values) and truncation bits are copied from the Longitudinal Spectropolarimeter OM values. The demodulation matrix applied are the ones for the ITM.
![Page 19: Calibration And Observation In IMaX](https://reader033.fdocuments.us/reader033/viewer/2022042521/558d4f9ad8b42a9b5e8b4690/html5/thumbnails/19.jpg)
New Observing Modes: Simulating ITM with FPTM
● Because L3, L5, L6, L7 and L12 are carried out with a FPTM, some tricks have to be applied:
– Because FPTM needs 4 polarizations for the ROCLIs, the 2 polarizations are performed twice.
– The 4x4 demodulation matrix is built from the 2x2:
a bc d ⇒a b 0 0
c d 0 00 0 a b0 0 c d
![Page 20: Calibration And Observation In IMaX](https://reader033.fdocuments.us/reader033/viewer/2022042521/558d4f9ad8b42a9b5e8b4690/html5/thumbnails/20.jpg)
Observing DECOs
● SetObservingMode(dswMode, camera, ccdTimeExposure, iddleTime, accumulations, truncation, demodulation, wavelengthsNo, RocliNo, wavelengths[5], retardancesR1[4], retardancesR2[4], discards[5], cycles, time)
● StartVectorSpectropolarimeterOM(cycles, time), same for StartVectorMagnetographOM, StartLongitudinalSpectropolarimeterOM, StartLongitudinalMagnetographOM and StartDeepMagnetographOM.
![Page 21: Calibration And Observation In IMaX](https://reader033.fdocuments.us/reader033/viewer/2022042521/558d4f9ad8b42a9b5e8b4690/html5/thumbnails/21.jpg)
Observing DECOs
● StartConfigurableOM(cycles, time, tuningMode)
● StartV3ObservingMode(accumulations, cycles, time, demodulation), same for StartV5ObservingMode, StartV6ObservingMode, StartV7ObservingMode, StartV12ObservingMode, StartL3ObservingMode StartL5ObservingMode, StartL6ObservingMode, StartL7ObservingMode and StartL12ObservingMode.
![Page 22: Calibration And Observation In IMaX](https://reader033.fdocuments.us/reader033/viewer/2022042521/558d4f9ad8b42a9b5e8b4690/html5/thumbnails/22.jpg)
Observing DECOs● ChangeCF_LambdaToVoltageCoefficient_A(a,
writeToCFHD)● ChangeCF_LambdaToVoltageCoefficient_B(a,
writeToCFHD)