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--- technical:description [2025/03/24 17:21] – [(13) MTR2 spectrograph] etienne
+++ technical:description [2025/05/15 11:44] (current) – [(6) Field scanning (OBJ2)] etienne
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 Simplified cartoon of the light-path within THEMIS identifying the main instrumental blocks. The spectrograph is not represented. \\
-<html> <a href="https://www.themis.iac.es/lib/exe/fetch.php?media=themis.png"><img src="https://www.themis.iac.es/lib/exe/fetch.php?media=themis.png" style="width:80%; height: auto;"></a></html> \\
+<html> <a href="https://www.themis.iac.es/lib/exe/fetch.php?media=results:gallery:schema:themis.png"><img src="https://www.themis.iac.es/lib/exe/fetch.php?media=results:gallery:schema:themis.png" style="width:80%; height: auto;"></a></html> \\
 \\
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 ==== (6) Field scanning (OBJ2) ====
-The OBJ2 movable mirror allow a fine scanning of the field of view one the Sun. This allows to move the field of view on the target without the need to move the telescope (the latter being much less precise). This scanning mirror enables displacement with increment as small as 0.01". This would however be smaller than the seeing limits even with adaptive optics working. Typical observations uses scanning steps of the range 0.1" to a few ".
+The OBJ2 movable mirror allow a fine scanning of the field of view one the Sun. This allows to move the field of view on the target without the need to move the telescope (the latter being much less precise). This scanning mirror enables displacement with increment as small as 0.01" arcsec. This would however be smaller than the seeing limits even with adaptive optics working. Typical observations uses scanning steps of the range 0.1" to a few arcseconds.
 <html><font color="#ff9900"> Users not performing sit-and-stare observations shall define the scanning properties for their observations. </font></html>
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-Simplified cartoon THEMIS adaptive optic light-path. \\
+Simplified cartoon of THEMIS adaptive optic light-path. \\
 <html> <a href="https://www.themis.iac.es/lib/exe/fetch.php?media=:results:gallery:schema:opticalpath_tao.png"><img src="https://www.themis.iac.es/lib/exe/fetch.php?media=:results:gallery:schema:opticalpath_tao.png" style="width:80%; height: auto;"></a></html> \\
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 ==== (14) Spectral cameras ====
-At the exit of the spectrograph, several cameras are placed so that to record simultaneously in different wavebands spectral images (lambda,y) . The spectrograms have a typical spectral range of 6-7 Å (0.6-0.7 nm) depending of the wavelength. The spatial direction has an extend of 1' when performing polarised observations, 2' otherwise. When performing polarimetric observations, two spectrograms are fitted on the camera field-of-view, each including the opposite polarimetric state (e.g. I+V and I-V Stokes).
+At the exit of the spectrograph, several cameras are placed so that to record spectral images (lambda,y) simultaneously in different wavebands. The spectrographic images have a typical spectral range of 6-7 Å (0.6-0.7 nm) depending of the wavelength. The spatial direction has an extend of 1' when performing polarised observations, 2' otherwise. When performing polarimetric observations, two spectrographs are fitted on the camera field-of-view, each including the opposite polarimetric state (e.g. I+V and I-V Stokes).
 <html><font color="#0000ff"> The spectrographic images from the spectral cameras are the main data product of THEMIS MTR2 spectrograph observation mode. </font></html> [[observation:data#context camera| (cf. THEMIS data products)]]