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&size(28){''Observers' Manual for Polarimetry''};
#contents
* How to carry out polarimetry observations [#wdbde381]
Throughout this document we assume that you are logging i...
** Prepare for the normal observations [#j098c19e]
- See [[Observers' Manual>ObserversManual]]
** Insert the polarisation plate (wavelength plate) [#z8e...
- Type the pol command on nicpc.
nicpc% pol in
-- For the case you need to retract the polarisation plat...
nicpc% pol out
(usually you do not need to do this while observing)
** Initialise the polarisation plate's position angle [#q...
- Type the pol command with initialisation option.
nicpc% pol -init_rot
This makes the position angle (PA) to be at the mechanica...
** Test exposure [#feef1867]
- Make sure that the shutter is at the 'open' position (o...
- Take the test image by, e.g., the following command.
nicpc% TL 3 10
** Adjust the pointing [#z9c2c05a]
- Choose one of the J, H and K band image, and make that ...
- Display the polarisation window positions on the DS9 wi...
nicpc% PolReg.sh
///-ds9 で上のメニューバー[Region]=>[Load Regions]で、/ho...
Two green rectangles will be displayed, showing the posit...
Inside the left-side window, there will be a red square a...
- Put the target object on the red square with, e.g., the...
nicpc% xyoffset2 -p
click the current position of the target object, and then...
(see also [[Observers' Manual>ObserversManual]])
/// -UCC「赤外線観測モード」画面の「オフセット」に数値を...
/// -- [[基本マニュアル>基本マニュアル#m0d8bad7]]参照。
** Insert the Wollaston prism into the light path. [#e0e8...
- This process can be done interactively by using darkshu...
nicpc% darkshutter.py -p
** Test exposure [#e2adfcce]
- Take the test image to check if the target is properly ...
(example) nicpc% TL 3 10
If the target cannot be found near the centres of the pol...
** Focusing [#b2638d7d]
- The focus is known to shuft by ~ +0.2 when inserting th...
///shutter=openでfocus=-5.50 のとき、shutter=polにするとf...
nicpc% focus -5.20
- Then run the autofocus command to further adjust the fo...
nicpc% autofocus exp_time(sec) band(j/h/k) focus_start...
-- Make sure to specify which band to be used.
-- focus_start must be smaller than the focus_end.
-- If num_sample is omitted, the default value num_sample...
** Do the observations [#g01937a0]
- Use the command ''PLo'' to carry out the polarimetry ob...
nicpc% PLo mode exptime(sec) [object_name [num_frames_p...
(例) PLo 3 120 HD114710 2
This command automatically rotates the polarisation plate...
The definition of mode is similar to Lo/DL (see [[Observe...
** Self-guided observations [#b8f8ff68]
- You may want to detect your target with the fixed posit...
''gPLo" command can be used for this purpose. This comman...
In such case, follow the instruction below.
+ Move the target to the desired position on the detector...
nicpc% TL 3 2 (Test exposure)
nicpc% xyoffset3 630 580 (-->Click the target on the D...
nicpc% TL 3 2 (Confirm with test ex...
- Do the polarimetry observations with ''gPLo'' command.
nicpc% gPLo mode exptime(sec) object_name num_frames_pe...
For example, if you fix the target at X=630pix, Y=580pix ...
nicpc% gPLo 43 20 Cyg_OB2_6 4 h 630 580
* Notes for PLo, PTL [#u9b7b7b6]
- ''PTL'' is for test exposure, used when you do not like...
- ''PLo'' is for usual polarimetry observations.
- These commands automatically rotate the polarisation pl...
- For example,
PLo 3 10
gives a set of 12 frames listed below.
/data/120504/rawdata/j120504_0001.fits 0 deg
/data/120504/rawdata/h120504_0001.fits
/data/120504/rawdata/k120504_0001.fits
/data/120504/rawdata/j120504_0002.fits 45 deg
/data/120504/rawdata/h120504_0002.fits
/data/120504/rawdata/k120504_0002.fits
/data/120504/rawdata/j120504_0003.fits 22.5 deg
/data/120504/rawdata/h120504_0003.fits
/data/120504/rawdata/k120504_0003.fits
/data/120504/rawdata/j120504_0004.fits 67.5 deg
/data/120504/rawdata/h120504_0004.fits
/data/120504/rawdata/k120504_0004.fits
* Revision history [#cb009774]
- 2012.05.05 J.Takahashi: created
- 2012.05.16 J.Takahashi: reformatted to wiki, cited nic_...
- 2019.09.17 T.Saito: translated to English
終了行:
[[NIC-Top]]に戻る
&size(28){''Observers' Manual for Polarimetry''};
#contents
* How to carry out polarimetry observations [#wdbde381]
Throughout this document we assume that you are logging i...
** Prepare for the normal observations [#j098c19e]
- See [[Observers' Manual>ObserversManual]]
** Insert the polarisation plate (wavelength plate) [#z8e...
- Type the pol command on nicpc.
nicpc% pol in
-- For the case you need to retract the polarisation plat...
nicpc% pol out
(usually you do not need to do this while observing)
** Initialise the polarisation plate's position angle [#q...
- Type the pol command with initialisation option.
nicpc% pol -init_rot
This makes the position angle (PA) to be at the mechanica...
** Test exposure [#feef1867]
- Make sure that the shutter is at the 'open' position (o...
- Take the test image by, e.g., the following command.
nicpc% TL 3 10
** Adjust the pointing [#z9c2c05a]
- Choose one of the J, H and K band image, and make that ...
- Display the polarisation window positions on the DS9 wi...
nicpc% PolReg.sh
///-ds9 で上のメニューバー[Region]=>[Load Regions]で、/ho...
Two green rectangles will be displayed, showing the posit...
Inside the left-side window, there will be a red square a...
- Put the target object on the red square with, e.g., the...
nicpc% xyoffset2 -p
click the current position of the target object, and then...
(see also [[Observers' Manual>ObserversManual]])
/// -UCC「赤外線観測モード」画面の「オフセット」に数値を...
/// -- [[基本マニュアル>基本マニュアル#m0d8bad7]]参照。
** Insert the Wollaston prism into the light path. [#e0e8...
- This process can be done interactively by using darkshu...
nicpc% darkshutter.py -p
** Test exposure [#e2adfcce]
- Take the test image to check if the target is properly ...
(example) nicpc% TL 3 10
If the target cannot be found near the centres of the pol...
** Focusing [#b2638d7d]
- The focus is known to shuft by ~ +0.2 when inserting th...
///shutter=openでfocus=-5.50 のとき、shutter=polにするとf...
nicpc% focus -5.20
- Then run the autofocus command to further adjust the fo...
nicpc% autofocus exp_time(sec) band(j/h/k) focus_start...
-- Make sure to specify which band to be used.
-- focus_start must be smaller than the focus_end.
-- If num_sample is omitted, the default value num_sample...
** Do the observations [#g01937a0]
- Use the command ''PLo'' to carry out the polarimetry ob...
nicpc% PLo mode exptime(sec) [object_name [num_frames_p...
(例) PLo 3 120 HD114710 2
This command automatically rotates the polarisation plate...
The definition of mode is similar to Lo/DL (see [[Observe...
** Self-guided observations [#b8f8ff68]
- You may want to detect your target with the fixed posit...
''gPLo" command can be used for this purpose. This comman...
In such case, follow the instruction below.
+ Move the target to the desired position on the detector...
nicpc% TL 3 2 (Test exposure)
nicpc% xyoffset3 630 580 (-->Click the target on the D...
nicpc% TL 3 2 (Confirm with test ex...
- Do the polarimetry observations with ''gPLo'' command.
nicpc% gPLo mode exptime(sec) object_name num_frames_pe...
For example, if you fix the target at X=630pix, Y=580pix ...
nicpc% gPLo 43 20 Cyg_OB2_6 4 h 630 580
* Notes for PLo, PTL [#u9b7b7b6]
- ''PTL'' is for test exposure, used when you do not like...
- ''PLo'' is for usual polarimetry observations.
- These commands automatically rotate the polarisation pl...
- For example,
PLo 3 10
gives a set of 12 frames listed below.
/data/120504/rawdata/j120504_0001.fits 0 deg
/data/120504/rawdata/h120504_0001.fits
/data/120504/rawdata/k120504_0001.fits
/data/120504/rawdata/j120504_0002.fits 45 deg
/data/120504/rawdata/h120504_0002.fits
/data/120504/rawdata/k120504_0002.fits
/data/120504/rawdata/j120504_0003.fits 22.5 deg
/data/120504/rawdata/h120504_0003.fits
/data/120504/rawdata/k120504_0003.fits
/data/120504/rawdata/j120504_0004.fits 67.5 deg
/data/120504/rawdata/h120504_0004.fits
/data/120504/rawdata/k120504_0004.fits
* Revision history [#cb009774]
- 2012.05.05 J.Takahashi: created
- 2012.05.16 J.Takahashi: reformatted to wiki, cited nic_...
- 2019.09.17 T.Saito: translated to English
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