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Fireball Spectrum
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Bill W



登録日: 2012.02.13
記事: 129
所在地: Glasgow

記事日時: Wed Aug 14, 2013 12:00 am    記事の件名: Fireball Spectrum 引用付きで返信

Hi,

Since I started using UFO Capture 6 years ago last night's Perseid shower gave me two of the best spectra I have ever recorded!

These are attached....

Best Regards,

Bill.



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APODman



登録日: 2011.01.08
記事: 34

記事日時: Wed Aug 14, 2013 12:49 am    記事の件名: 引用付きで返信

This is absolutely fantastic ! One of the best record of spectrum of a meteor I ever saw!

What was the equipment used?

I have also tried to make records like this that got spectra of a Delta Aquarids:



But do not compare to your record, the resolution of the spectrum is absurd!
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SonotaCo
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登録日: 2004.08.07
記事: 9032
所在地: 139.66E 35.65N

記事日時: Wed Aug 14, 2013 8:04 am    記事の件名: 引用付きで返信

Bill W wrote:

Since I started using UFO Capture 6 years ago last night's Perseid shower gave me two of the best spectra I have ever recorded!

Congratulations! It is a really nice close up.


APODman wrote:
One of the best record of spectrum of a meteor I ever saw!

Do you know this?
http://sonotaco.sub.jp/report/2006/200603/media/M20060329_202422_TK1_G6.wmv
This is taken by 1/2"CCD WATEC902H + 6mmF0.8 + 500lpm polyester transparent grating film
This was a spectrum of earth grazing fireball. See figures below also.
http://sonotaco.jp/forum/viewtopic.php?t=912



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Bill W



登録日: 2012.02.13
記事: 129
所在地: Glasgow

記事日時: Wed Aug 14, 2013 5:09 pm    記事の件名: 引用付きで返信

Hi APODman,

Thanks, I was really lucky with these!

They're a bit of a cheat though since it is two orders of the same spectrum filling the field of view.

About 1/3 of the left side is the 1st order and the other 2/3 to the right are the second order.
However it is better than I imagined!
The spectrum were captured using a Watec 902H2 Ultimate, 12mm f1.2 lens and a 300 lines per mm blazed grating attached using a home made holder.

This one is a bit more represenative of the shower. (The first two were huge fireballs.)

cheers,
Bill.



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Bill W



登録日: 2012.02.13
記事: 129
所在地: Glasgow

記事日時: Sun Aug 18, 2013 5:44 am    記事の件名: 引用付きで返信

Hi,

Took a couple of days to analyse and measure the spectrum

Here's a graphical slice through the bright fireball at 014400 13/8/13

cheers,
Bill.



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Bill W



登録日: 2012.02.13
記事: 129
所在地: Glasgow

記事日時: Mon Aug 19, 2013 6:06 am    記事の件名: 引用付きで返信

Hi SonotaCo,

When I discovered your software it was seeing your spectrum that gave me the idea to try my own video camera for spectroscopy in 2007.
Before then I had only ever used still cameras for meteor observing and some spectroscopy (slr since 1983/ccd since 2001 but I never captured a single spectrum!!!).
Thanks for a great program.
Regards,
Bill.
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Bill W



登録日: 2012.02.13
記事: 129
所在地: Glasgow

記事日時: Mon Aug 19, 2013 6:19 am    記事の件名: 引用付きで返信

Hi APODman,
What was the set up you used to get the Delta Aquarid spectrum?
It is a lot rarer than Perseid spectrum!
Also, do you try spectroscopy often?
Best regards,
Bill.
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APODman



登録日: 2011.01.08
記事: 34

記事日時: Tue Aug 27, 2013 8:27 pm    記事の件名: 引用付きで返信

Hi Bill and Sonotaco !

WOW !!! These are really high level captures !! I'm still far away from them. My intention is to conduct a statistical study of the spectroscopic characteristics of different meteor showers but I have to perform an upgrade on my equipment.

The setup I use is a WATEC 902h2 Ultimate with a Fujinon YV2.7x2.9LRD-SA2 lens, where I engage a Star Analyzer grid with only 100 l/mm. The advantage is to allow a large field with greater chances of catches meteor, but there is too great a loss of resolution. Another problem is that low resolution spectra are high affected by the interlacement artifacts of WATEC camera (as can be seen in my image), I really need higher resolution.

I would ask you and mr. Sonotaco what would be the appropriate lens and where to buy a blazed diffraction grating with more lines per millimeter.

Regards !
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APODman



登録日: 2011.01.08
記事: 34

記事日時: Tue Aug 27, 2013 8:34 pm    記事の件名: 引用付きで返信

I'm thinking to test this setup, I think it interesting and with great results. What do you think?

- http://blog.renren.com/share/200205992/11062471228
- http://imo.net/files/wgn/2011/WGN39-2.pdf


I consider to use the Edmund Optic's 4 degree Nom. Wedge Prism VIS-NIR Coated
- http://www.edmundoptics.com/optics/prisms/specialty-prisms/wedge-prisms/2052
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登録日: 2004.08.07
記事: 9032
所在地: 139.66E 35.65N

記事日時: Tue Aug 27, 2013 8:42 pm    記事の件名: 引用付きで返信

APODman wrote:
I would ask you and mr. Sonotaco what would be the appropriate lens and where to buy a blazed diffraction grating with more lines per millimeter


Well, there is no good lens for C/CS mount now.
(CBC F0.8 series became discontinued)
SO now I can recommend only HD system. for example....

Nikon D800 + 28mmF1.8 or Panasonic DMC-GH3 (with remote cable) + 17mmF0.95
These are color!!
BlackMagic HDMI to SDI convertor
BlackMagic mini recorder (SDI/HDMI to PCI-ex)
about HD, read below.
http://sonotaco.com/soft/UFOHD2/UFOHD2Manual/en/0-0.html


As for grating equipments, for example, see below
http://www.edmundoptics.com/optics/gratings/holographic-diffraction-grating-film/1490
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APODman



登録日: 2011.01.08
記事: 34

記事日時: Tue Aug 27, 2013 9:39 pm    記事の件名: 引用付きで返信

Thanks Sonotaco !

The UFOCapture HD is compatible with Canon T3i ?
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Bill W



登録日: 2012.02.13
記事: 129
所在地: Glasgow

記事日時: Tue Aug 27, 2013 10:56 pm    記事の件名: 引用付きで返信

Hi APODman,

I have been using the same capture set up for a number of years now.
This is a Watec 902H2 Ultimate with a pentax 12mm f1.2 lens.
The grating is a 300 lpm , 25mm x 25mm from a company called Thorlabs.
If you do an internet search you'll find them. They are big optical re-seller and now do on line sales.

I was at the International Meteor Conference in Poland a few days ago and by conincidence several observers commented that the Edmond gratings were not so good. I've never used one myself so I can't say for sure but it might be worth checking out other suppliers for price/quality.
Another company I've used is called Melles Griot but I don't know if they do retail sales.

About the artifacts you mention, that is a very good point!
This is a problem with all interlaced video type cameras. The dark interscan lines can cause all sorts of problems and can often look like the little bumps of lines in a spectra when they are not. You need to be very careful!

Prisms are good because they only give one spectrum BUT the dispersion is not linear.
Gratings give many "orders" of spectrum but are much more linear so measuring the lines is easier. Pesonally, if you want to try some more spectroscopy without spending too much more money is to use you current grating but buy a slightly longer focal length lens. Like the 12mm f1.2. This will "stretch" the spectrum and with the low number count you'll probably get the second order with twice the resolution quite often (relatively speaking!)

Hope this helps.
cheers,
Bill.
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SonotaCo
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登録日: 2004.08.07
記事: 9032
所在地: 139.66E 35.65N

記事日時: Wed Aug 28, 2013 8:21 am    記事の件名: 引用付きで返信

APODman wrote:
The UFOCapture HD is compatible with Canon T3i ?

I don't know but I am afraid it is not.
Generally HDMI output of DSR has problems like below.
I have no succeeded report about HDMI output of Canon T3i.

- HDMI video is not outputted while live viewing (it is just for play back) -- most of compact cameras.
- Live view output is not HD.
- View area is smaller than 1920x1080 (having black frame) -- Canon EOS 6D.
- Live view shut downs automatically in short time (5 or 10 minutes).
- Information overlay on the video cannot be erased.
- Video format is not stable.
See images below about Canon EOS 6D.
http://sonotaco.jp/forum/viewtopic.php?t=2955

Bill W wrote:
the Edmond gratings were not so good.

I agree for polyester film ones that I am using Embarassed .
They are very low cost products for education.
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Bill W



登録日: 2012.02.13
記事: 129
所在地: Glasgow

記事日時: Wed Aug 28, 2013 11:41 pm    記事の件名: 引用付きで返信

Hi,

My comment about the Edmond grating was not well worded.

The other guys were speaking about the blazed glass gratings not the polyester film.

I've never used an Edmond glass grating but I've used the polyester film myself for a long time exactly because it is inexpensive and you can cut it to size for larger lenses. The cost of a large glass grating would be very high!

Regards,
Bill.
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Bill W



登録日: 2012.02.13
記事: 129
所在地: Glasgow

記事日時: Tue Sep 10, 2013 3:07 am    記事の件名: 引用付きで返信

Hi All,

Whilst inspecting the de-interlaced frames from one of my spectra I discovered something quite unusual.
Towards the end of the meteor ablation the spectrum seems to decompose into two distinct spectra with different lines in the upper and lower sections.
I was wondering if anyone has any other examples of this or is it a unique effect?

Cheers,
Bill.



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