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Astronomy Picture of the Day 9-07-02
NASA ^
| 9-07-02
| Robert Nemiroff and Jerry Bonnell
Posted on 09/07/2002 5:06:44 AM PDT by petuniasevan
Astronomy Picture of the Day
Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.
2002 September 7
Stereo Saturn
Credit: Voyager Project, LPI, JPL, NASA
Explanation: Get out your red/blue glasses and launch yourself into this stereo picture of Saturn! The picture is actually composed from two images recorded weeks apart by the Voyager 2 spacecraft during its visit to the Saturnian System in August of 1981. Traveling at about 35,000 miles per hour, the spacecraft's changing viewpoint from one image to the next produced this exaggerated but pleasing stereo effect. Saturn is the second largest planet in the Solar System, after Jupiter. Its spectacular ring system is so wide that it would span the space between the Earth and Moon. Although they look solid here, Saturn's rings consist of individually orbiting bits of ice and rock ranging in size from grains of sand to barn-sized boulders.
TOPICS: Astronomy; Astronomy Picture of the Day; Science
KEYWORDS: astronomy; image; photography; saturn; spacecraft; stereo; voyager
Astronomy Fun Fact:Saturn is the planet with the lowest density. If you could put it in water, it would float!
ARRGGGHHH! The red/blue stereo effect!
I need to get a pair of those glasses - or maybe use magic markers on pieces of Saran wrap.
Get on the 
list!
To: MozartLover; Joan912; NovemberCharlie; snowfox; Dawgsquat; viligantcitizen; theDentist; grlfrnd; ...
To: petuniasevan
Glad I saved my 3Ds from the LAST thread ...
What I really wonder is if they can get some quantification of images including intensity changes of fluorescence, changes in cell or particle velocity, direction, shape and size over time and schematic visualization of such changes. I understand that in some special cases, volume changes can be measured. &;-)
3
posted on
09/07/2002 5:23:29 AM PDT
by
2Trievers
To: petuniasevan
To: 2Trievers
Of Course With laser interferometry in a Schleren Tank you can measure the velocity/vector changes of every particle in the scanned field in living color but it provides only qualitative data with precision...for true impact in quantitave terms you're better off with an ultrasound Source Transducer and measuring intensity via NTR Systems Acoustic Intensity Measurement System...I can get you a discount...only $35k...Water conditioner not included....
You can scan through 7 degrees of freedom at 11micron precision using scan averaging for a precision of 1%.
To: sleavelessinseattle
"for true impact in quantitave terms you're better off with an ultrasound Source Transducer and measuring intensity via NTR Systems Acoustic Intensity Measurement System...I can get you a discount...only $35k...Water conditioner not included.... "Like other people on this forum, I live large and well ... an ultrasound Source Transducer sounds like just what I am looking for. I already have the water container ... remember that dang in-ground pool I love so well?
Are these piezoelectric transducers or round transducers? What will the defraction effects in the Frenzel zone be? Any idea? &;-)
6
posted on
09/07/2002 12:58:54 PM PDT
by
2Trievers
To: 2Trievers
Transducers are typically constructed with Piezoceramic elements in either phased array or single high energy pulsed configuration...Of course with the increased use of Space age PVDF Materials, its possible to reverse the flow of current in a membrane hydrophone but precision is poor. And we've yet to discuss using high intensity lasers to produce supersonic shock waves from phase change and cavitation artifacts...you'll definitely want to use a rugged Piezoceramic... possibly a reflected as opposed to direct measure as well depending on your budget...I'm afraid your pool will have too much surface area and dissolved gasses will cause cavitation at higher Intensities...Of course if you're studying Sonoluminesence...all the better. A water conditioner would be a sound(pardon the pun) investment since I understand you have a considerable follicular deposition problem of the canine variety...
To: petuniasevan
Only red-green stereo glasses I have had came inside a comic book, and they were paper and sized for a 5 year old. People who distribute these red-green stereo images should be required to provide red-green glasses in every issue of Sky & Telescope and the Int Darksky Assoc newsletter.
To: RightWhale
Hear Hear!....I feel discriminated against! P7...you were nice enough to provide suggestions on how to simulate the effect...it wouldn't kill the NASA boys to provide a link to a source for the glasses and/or instructions on how to make the units...I'm getting a headache!
To: sleavelessinseattle
The nearest school supply store might have rolls of colored acetate material like they use for crafts in kindergarden. The red is easy to find, but the green or blue is excedingly rare.
To: sleavelessinseattle
Well, the Magic Markers on Saran Wrap works so-so.
A tip: DON'T inhale while viewing.
The marker fumes gave me a buzz, and I have to go to work!
To: sleavelessinseattle
To: petuniasevan
The reflection from rocks and ice are quite beautiful, those rings are spectacular!! Good job APOD!
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