IRCAM_INSPECT_FOCUS
Section: User Commands (1)
Updated: Oct 2012
Index
Return to Main Contents
NAME
ircam_inspect_focus - inspect the optics using a webcam up close (to check alignment and avoid eye-hazards).
DESCRIPTION
The IR Camera is mounted inside a dewar. It's difficult to see when the optics are aligned,
and until they are nearly focused, there is no way to get a good image. The alignment process is:
1. Place the dummy chip in the dewar, and use the ircam_plcc84 script to shine light OUT of the dewar,
then adjust the focus to ensure that spots are formed on the plane of the lamp board. This is a good
initial setting, but the focal plane of the Hawaii chip isn't exactly the same place.
2. Put the bare MUX (or the real Hawaii chip) into the dewar. Shine the lamp board (or torch) onto it
through the lens with the same focus as before (control the lamp board with local switches, and with
ircam_serial_illuminate). Then, look at the plane of the chip through the dewar window, and try to
focus the spots. This is dangerous (placing one's head under a heavy dewar, and eye potentially in a
laser beam is unwise); also it's difficult to see easily. So we use a cheap USB webcam. Invoke this
script without -h to use VLC to display the webcam. (or run ''.)
3. Now that the system is basically aligned, it should be possible to capture data and then display what
the Hawaii sensor actually sees (and then use beamfinder to get the exact pixels).
This is also useful for remotely checking that state of illumination of the sensor. The 'torch' illumination is
easy to see; the LED illumination is faint but discernible. See: ircam_serial_illuminate.
USAGE: invoke with no arguments for video, or 'still' for a single picture.
AUTHOR
The author of ircam_inspect_focus and this manual page is Richard Neill, <ircam#AT(spamblock)#richardneill.org>
Copyright Oct 2012; this is Free Software (GPL v3+), see the source for copying conditions.
SEE ALSO
pb_convey_hwtrigger(1),
pb_arm(1),
pb_utils(1)
Index
- NAME
-
- DESCRIPTION
-
- AUTHOR
-
- SEE ALSO
-
This document was created by
man2html,
using the manual pages.
Time: 16:21:52 GMT, November 19, 2013