Re: ISS LIDAR System

From: David Tiller <dtiller_at_captechconsulting.com>
Date: Sat, 8 Feb 2014 23:03:24 +0000
Wouldn't the eye respond to the 'average' energy delivered per second, which is 5000 mJ/s for CATS and only 2200 for CALIPSO?

On Feb 8, 2014, at 17:57, "Gregg Hendry" <gregg.hendry_at_gmail.com> wrote:

> According to the referenced web site:
> 
> "While CALIPSO can deliver 20 pulses of laser per second, using, as
> McGilldescribed it, a whopping 110
> milliJoules of energy in each of those pulses, CATS will fire 5,000 laser
> pulses per second, with only about 1 milliJoule for each pulse."
> 
> With less than 1 percent of CALIPSO's laser power CATS would be quite
> difficult to see.  One would have to be within 100 meters or less of the
> laser's ground track to see anything but a brief green twinkle.  I am
> guessing that under ideal conditions an observer exactly on the ground
> track could see a short green streak maybe 1 degree wide and 5 to 10
> degrees long.
> 
> On the plus side though, the ISS comes around occasionally at a reasonably
> civilized hour.  CALIPSO only appears in shadow around 2:30 AM
> 
> Gregg Hendry
> 
> 
> On Wed, Feb 5, 2014 at 5:27 AM, DAVID DICKINSON <ghedi_dave_at_yahoo.com>wrote:
> 
>> Interesting; a LIDAR system similar to the one used by CALIPSO is headed
>> to the ISS later this year;
>> 
>> 
>> http://www.nasa.gov/mission_pages/station/research/news/cats_in_space/#.UvItiPldWb7
>> 
>> 
>> I wonder if it'll be visible on shadow passes of the station?
>> 
>> Thanks,
>> 
>> Dave Dickinson
>> Blog: www.astroguyz.com
>> Twitter: http://twitter.com/Astroguyz
>> Youtube: http://www.youtube.com/astroguyz
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Received on Sat Feb 08 2014 - 23:04:06 UTC

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