From: Michael Tarbell <mtarbell.nul> Date: Mon, 27 Aug 2012 09:24:30 -0600 Archived: Mon, 27 Aug 2012 15:58:58 -0400 Subject: Re: Chasing Mexican UFOs >From: Bruce Maccabee<brumac.nul> >To: post.nul >Date: Sun, 26 Aug 2012 14:19:05 -0400 (EDT) >Subject: Re: Chasing Mexican UFOs >>From: Michael Tarbell<mtarbell.nul> >>To: post.nul >>Date: Fri, 24 Aug 2012 13:39:53 -0600 >>Subject: Re: Chasing Mexican UFOs <snip> >>Hence the total 3-5 micron radiant power at 100 mi. range >>required to noticeably exceed the atmospheric background >>radiance at the camera is at least ~7000 x 6.5 megawatts or ~46 >>gigawatts, which is some 7 times the hydroelectric power output >>of the Grand Coulee Dam. >>While it would clearly rule out the oil field flare theory, this >>number is so enormous that I'm seriously doubting my own >>calculation. Can you point out where/if I went astray? Not >>really my area of expertise, so >>please set me straight if >>necessary. <snip> >This FOV is spread over a focal plane array of pixels that is >320 by 240 (half the NTSC standard TV linear resolution). Thus >one pixel in the MED resolution has an instantaneous (linear) >FOV (IFOV)(vertical and horizontal) of about 3.4/320 = 0.011 >deg. Thus the angular size of the fire, 1.1E-3 deg, is much >smaller than the angular resolution of the sensor in the MED >setting, 0.011 deg, so, to the FLIR system the image of a fire >of that size and distance would "fit onto" a pixel. Thanks Bruce, this is exactly where I went wrong... using the entire camera field of view instead of that of a single pixel, which of course is the most that would be directly illuminated by a point source (although the objects in the video clearly occupy more than a single pixel... if this is indeed due to 'slop over' from a single intensely illuminated pixel, then obviously the source is far exceeding the 1%-of-background criterion I used to estimate its minimum power). I have since obtained more refined data about atmospheric irradiance and extinction properties in the infrared, and will return soon with a revised calculation, including an estimate of the radiant power of an oil well flare in the relevant wavelength band. Regards Mike Listen to 'Strange Days... Indeed' - The PodCast At: http://www.virtuallystrange.net/ufo/sdi/program/ These contents above are copyright of the author and UFO UpDates - Toronto. They may not be reproduced without the express permission of both parties and are intended for educational use only.
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