Talk:Thermography

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Range

Why if infrared light goes not just to 14 micrometers but to a hundred or thousand (thus, a milimiter) the thermography uses information to the 14 micrometers wavelength? Wikipedia shall explain that as it seems no source explains it... As far as I could understood for a close call in an astronomy site was that images showing near, mid and far serve different purposes but thermographs are heat-related and used for vision in the earth of less astral matters and the article claimed none is heat related (it used a variation which has near end at 11 micrometers and the range of the mid went well above the reach of thermographs thus really their explanation could not involve in any way the concept of it being both a kind of light and heat). The hottest object perceptible through infra-red light would emit what wavelength? These are the limits of this article that whoever can solve must if he or she wants to improve it. Herle King 21:27, 6 March 2007 (UTC)

infra red instrument line scaner infra image —Preceding unsigned comment added by 41.233.240.64 (talk) 00:08, 24 November 2008 (UTC)[reply]

The full spectrum of electromagnetic radiation is shown below.

Basically the higher the frequency (towards the left of the diagram) the hotter the temperature.

As can be seen, visible light falls in a very narrow range of the spectrum (from .3 to .7 micrometers) while the infrared range generally falls between 3 to 14 micronmeters in wavelength which is about 30 times the band width of visible light (for the purpose of infrared measurement). The range is a lot greater when taking near light and far infrared into account. The infrared spectrum starts at about 3 microns which corresponds to about 1000 degrees Kelvin (about 725 degrees Celsius) and stretches to about 14 micrometers which is about 240 degrees Kelvin or -50 degrees Celsius. The infrared spectrum is able to radiate down to almost -270 degrees Celsuis but that is out of the range of most cameras sold today which is the reason we block the spectrum in the range we see.

Hope this helps.Hotflashhome (talk) 02:13, 1 August 2008 (UTC)[reply]

blabla

hi, i'm in the middle of preparing a speech on thermography that is meant to go for at least 10 minutes. I am planning to crate some hand-outs, so i was wondering if you could tell me any sites that would have some really clear example photos

can some one mention the electronic surveillance application? 134.193.94.173 18:52, 26 June 2006 (UTC)[reply]

Vandalism

I reverted vandalism to the See Also section. DLPanther 21:58, 13 September 2007 (UTC)[reply]

general structure of page

this page seems to be very unorganised and very "simple" for example "going to mars" —Preceding unsigned comment added by Jake Dove (talk • contribs) 19:54, 24 January 2008 (UTC)[reply]

Pre-digital IR cameras

The article describes IR cameras from the Korean War. One of these apparently all-optical cameras is shown in the 1973 movie Gordon's War (though the image is not as informative as modern IR cameras). But how was it possible to form a visible image based on IR light before computers? 70.15.116.59 (talk) 05:57, 28 January 2008 (UTC)[reply]

- By using IR sensitive film. —Preceding unsigned comment added by 88.91.116.30 (talk) 18:23, 30 May 2008 (UTC)[reply]

Gordon's War refers to the Vietnam conflict and not Korea. During the 1960's there was a great expansion of the use of thermal systems in the military. The era saw the development of the earliest heat seeking missiles which used a thermal system similar to today's cameras. Today some of the thermal cameras are restricted from being removed from the country where they were purchased for fear that the technology will fall into the wrong hands.

Thermal systems were also used to spot campfires in the jungle to help the military to find the Viet Cong or NVA regulars as they operated at night in that environment. These systems were often mounted on spotter aircraft.

In the late 1960's the earliest commercial thermal cameras with their operating systems weighed 100's of pounds and required a small truck to move. The output for these was shown on an oscilloscope to view the signal. Hope this helps.Hotflashhome (talk) 01:50, 1 August 2008 (UTC)[reply]

Shuttle picture

We now have a picture of the Space Shuttle on reentry with infrared and visible light components. It might be instructive for this article. -- ke4roh (talk) 01:23, 17 May 2013 (UTC)[reply]

History section

The first section of many articles describes the history of a particular topic. This page lacks a history section, though it contains some scattered info about one. Anybody want to go in and organize it into its own section? — Preceding unsigned comment added by 64.134.102.152 (talk • contribs) 15:48, 6 June 2013‎