Talk:LIDAR
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Call me crazy, but aren't radio waves technically light as well? Thus it's hard to say that LIDAR uses light rather than radio waves... --Dante Alighieri 09:19 28 Jun 2003 (UTC)
Light and radio waves are both distinct forms of electromagnetic radiation. I don't think the definitions of light and radio waves overlap. The wavelength range of light is about 400 to 800 nm, while the range of radio waves is about 0.1 m to infinity. These ranges do not overlap. See Electromagnetic spectrum. -- Heron
Well, I'm not talking about visible light, but light as a generic term... used to refer to the entire electro-magnetic spectrum. If light refers only to visible light, then it seems rather redundant to call it visible light. ;) --Dante Alighieri 09:45 28 Jun 2003 (UTC)
Infra-red and ultra-violet are generally thought of as light too. Generally "light" is used to refer to anything between the far infra-red to the extreme ultra-violet. Terahertz radiation represents the grey area between "light" and radio at the low end, and EUV starts to blend into "soft" X-rays at the high end.
So it's:
- Radio
- ELF, VLF
- ...
- UHF
- Microwaves
- Terahertz rays (grey area)
- Light
- Far IR
- Near IR
- Visible spectrum
- "Red, orange, yellow, green, blue, indigo, violet"
- Ultra-violet
- Extreme ultraviolet (grey area)
- X-rays
- Gamma rays
- etc...
-- Anon.
Is LADAR the correct term here - or should it be LIDAR? Perhaps with a sub heading for Ladar.
- Ladar also seems to have a lot of eye surgery references as ther is a tradenamed procedure that begins with Ladar.
- Also see
Ladar (http://www.photonics.com/dictionary/lookup/XQ/ASP/url.lookup/entrynum.2792/letter.l/pu./QX/lookup.htm) which cross references to Lidar (http://www.photonics.com/dictionary/lookup/XQ/ASP/url.lookup/entrynum.2951/pu./letter.l/QX/lookup.htm), as a more general term.
- A google search for Ladar (http://www.google.com/search?q=ladar) gives 9,160 entries, while a google search for Lidar (http://www.google.com/search?q=lidar) gives 296,000.
Lidar is linked to Ladar in Wikipedia. I think it should be the other way around, or there be two entries. Also should these terms be capitalised? They are spelt as Ladar and Lidar in many internet entries.
- Any thoughts? kiwiinapanic 09:59, 17 Dec 2003 (UTC)
- I'm with you on this. I originally created this as an offshoot of RADAR and have since learned that it's much more common to refer to it as LIDAR. Feel free to move it! Maury 13:19, 17 Dec 2003 (UTC)
- Page moved from LADAR to LIDAR. kiwiinapanic 11:37, 31 Dec 2003 (UTC)
Lidar is the more general term. The distinction between lidar and ladar depends more on the nature of the target. Traditionally lidar has been used to refer to diffuse targets (eg atmospheric aerosols) while ladar has been used to refer to hard (ie solid) targets. In the early 90s there was a letter submitted to Photonics Spectra (IIRC) that discussed the subtleties of this issue. Personally I tend to use the term laser remote sensing these days as not all of the instruments I develop in my professional life provide range information and lidar is therefore a subset of laser remote sensing. There are a number of implicit assumptions built into the information currently conveyed on the page that are not always correct. I will think about how to correct these with minimal editing changes but do not have time at the moment. --Gary Spiers - www.lidar.com 06:15 28 Apr 2004 (UTC)
Mirror Choice
can anyone tell me what some of the pros & cons are of using a polygon mirror?
Mirror Choice
can anyone tell me what some of the pros & cons are of using a polygon mirrors?