ISIS do not merge the orders 51,52and 53 to a xxxfull.fit

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Re: ISIS do not merge the orders 51,52and 53 to a xxxfull.fi

Postby Joan Guarro Flo » Sat Aug 25, 2018 7:19 pm

Hello Berthold and Olivier,

There is also the possibility that, (within the guide box), the input of the optical fiber and the pinhole have been decentralized. Is that possible?

Cheers, Joan.
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Re: ISIS do not merge the orders 51,52and 53 to a xxxfull.fi

Postby Olivier GARDE » Sat Aug 25, 2018 7:54 pm

Joan Guarro Flo wrote:Hello Berthold and Olivier,

There is also the possibility that, (within the guide box), the input of the optical fiber and the pinhole have been decentralized. Is that possible?

Cheers, Joan.


Joan,

yes, it is a possibility, but it is also possible that one of the two fibers are defective. Personally, I had a fiber that lost more than 50% of flux after a while. (excessive curvature or stretching during telescope movement affected flux transmission through the fiber)
LHIRES III #5, LISA, e-Shel, C14, RC400 Astrosib, AP1600
http://o.garde.free.fr/astro/Spectro1/Bienvenue.html
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Re: ISIS do not merge the orders 51,52and 53 to a xxxfull.fi

Postby Andrew Smith » Mon Aug 27, 2018 7:19 am

Berthold, have you tried cleaning the ends of the fibre? Even a small flecks of dust can obstruct the small fibre.

Regards Andrew
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Re: ISIS do not merge the orders 51,52and 53 to a xxxfull.fi

Postby Berthold Stober » Mon Aug 27, 2018 11:55 am

Hello even if I have switched in ISIS " reduce from order 32 to order 54 , ISIS do not reduce the order 54 , only at order 54! In the def_order.lst , def_line.lst and in line.lst the order 54 is defined .

What could be the reason please?
Berthold
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Re: ISIS do not merge the orders 51,52and 53 to a xxxfull.fi

Postby Berthold Stober » Mon Aug 27, 2018 12:14 pm

ISIS reduce in my case only at order 53!!

Berthold
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Re: ISIS do not merge the orders 51,52and 53 to a xxxfull.fi

Postby Olivier GARDE » Wed Aug 29, 2018 3:39 pm

If ISIS can't merge all orders, there is a problem on the edges of orders. You can check this by a "check3" in iSIS as on the attached image to check if ISIS detects all orders well and specially on the edge of each order. If it does go in all directions as in the example below where there has a "mustache" on 2 orders, that's could be the problem.

Image

To remedy this, 2 solutions:
- Modify the def_order file by modifying the start and end X values of the problematic orders
- Increase the number of flat to have more flux on these orders edges.

Also check that the def_lambda file correctly overlaps the orders on each other by 5-7%.

And you will obtain this merged graph (process with the Vega spectrum I send you), here with orders from #30 to #57 (but it's difficult to have #56 and #57 orders and the nominal value is order #55)
Image
LHIRES III #5, LISA, e-Shel, C14, RC400 Astrosib, AP1600
http://o.garde.free.fr/astro/Spectro1/Bienvenue.html
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Re: ISIS do not merge the orders 51,52and 53 to a xxxfull.fi

Postby Berthold Stober » Mon Sep 17, 2018 9:06 am

Hi

I have a new fiber from shelyak now but I need 40 sec to get 30.000 ADU with a KAF 1603 with the tungsten lamp and the calibration unit from shelyak, with the old fiber I needed only 20 sec for the same flux! What could be the cause?

Berthold
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