Taking Image with TRISPEC

The page below describes how to take images with the imaging and spectrograph detectors, and describes how to take a image with a single detector include the slit viewer. Please note that the details given below are subject to change at any time.

How to take images with three detectors simultaneously

To take images with three imaging and spectrograph detectors simultaneously, type on demi as follows.
% read.pl <IR1_exptime> <IR2_exptime> <optical_exptime> [<file_prefix>] [<number_of_shot>]
The IR1_exptime, IR2_exptime, and optical_exptime are exposure times for the shorter wavelength infrared channel (IR1), the longer wavelength infrared channel (IR2), and the optical channel respectively. The unit of exposure times is seconds. The file_prefix is a prefix name of image files. If you don't need the saved images at taking test exposure and so on, you can omit it. The number_of_shot indicates how many times do you take images continuously. If you will take just one exposure, you can omit it.

For example,

% read.pl 1 2 3 ngc7027
will expose the detector of the IR1 channel, one of the IR2 channel, and one of the optical channel for two seconds, two seconds, and three seconds respectively, simultaneously. Then it will create three image files with the following filenames.
i256a_ngc7027_01000ms01_02000ms01_03000ms_00.fit
i256b_ngc7027_01000ms01_02000ms01_03000ms_00.fit
s512a_ngc7027_01000ms01_02000ms01_03000ms_00.fit
First prefix means a identification of the detector. The prefix i256a, i256b, and s512a indicate the detector of the IR1 channel, one of the IR2 channel, and one of the optical channel respectively. The strings 01000ms01, 02000ms01, and 03000ms indicate exposure times for the IR1 channel, the IR2 channel, and the optical channel, respectively, and also indicate number of coadd for each infrared channel. The last suffix 00 (zero-zero) is shot number. If you add number_of_shot in the command, the image files with increacing number for each shot will be created.

If you omit the file_prefix in the above example, the images with the prefix "test" will be created as follows. This is usually used at taking test exposure. These "test" image files will be over-writed.

i256a_test.fit
i256b_test.fit
s512a_test.fit
For simultaneous exposure, the expoure time for the optical must be longer than one of both infrared channel by one second or over. The numbers of coadd are automaticaly decided by program. By using "sim" as the file_prefix, you are able to simulate creating image files (Therefore, you cannot use "sim" as a target name).

How to take a image with a single detector

To take a image with a single detector (include the slit viewer), type on demi as follows,
% rt.pl <detector_number> <exptime><number_of_sampling> <file_prefix> [<num_of_shot>]
The following number are available as detector_number,
1   -   the shorter wavelength infrared (IR1) channel
2   -   the longer wavelength infrared (IR2) channel
3   -   the optical channel
4   -   the slit viewer
The exptime means a exposure time. The unit of expousure time is milli-seconds. And, the number_of_smaple is fixed to 1. For example,
% rt.pl 4 1000 1 ngc7027
will expose the detector for 1000 milli-seconds, and create the image file with the following.
s512b_ngc7027.fit
The prefix s512b indicates the detector of the slit viewer. Please note that the string about the exposure time is not added in the file name. If you keep it in the file name, you have to add it to the file_prefix.

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Last Modification Date: 2001/02/20
Last Modification Author: Makoto Watanabe <watanabe@z.phys.nagoya-u.ac.jp>