Declan -- I'll stick my neck out a bit here.
Several years and at least a couple of lives ago, I took a detour into the wonderful world of optics. Here are a few things I remember -- All physical bodies above the temperature of absolute zero emit electromagnetic radiation in a characteristic spectrum dependent on their absolute temperature. The amplitude and wavelength of this spectrum can be approximated by the so called "black body radiation" curve. A so called "black body" is an idealized radiating object of a known temperature which meets certain criteria such as not reflecting or passing any radiation, i.e., it is completely absorbing of all incident radiation. It is often thought of as a box (or a sphere) with a hole in it, which is completely coated on the interior with soot (carbon), i.e., "black". Depending on temperature, bodies radiate in the far infrared (for very cool bodies [my wife for example]) to the gamma region (for _very_ hot bodies. Try the following two links for further useful reading, including some examples of the radiation curves of the human body and the sun given in the second link. http://www.phys.virginia.edu/classes/252/black_body_radiation.html http://www.unidata.ucar.edu/staff/blynds/tmp.html#Uni Caveat -- I make no representation of being an authority in the field of optical physics, the above is only what stuck to me on my tour through the wonderful world of optics and radiation physics. Hopefully, Uwe will catch any gross errors that I have made. Happy detecting, Bob Smith --- Avoid computer viruses, Practice safe hex --- -- Specializing in small, cost effective embedded control systems -- http://www.smithmachineworks.com/embedprod.html Robert L. (Bob) Smith Smith Machine Works, Inc. 9900 Lumlay Road Richmond, VA 23236 804/745-1065 [EMAIL PROTECTED] ----- Original Message ----- To: "Multiple recipients of list CHIPDIR-L" <[EMAIL PROTECTED]> Sent: Wednesday, November 19, 2003 7:28 AM > On Wed, Nov 19, 2003 at 03:49:55AM -0800, Tinco Brouwer enlightened us > thusly > > > > > >What I am looking for is reading to check the feasability. I need the > > >freauencies that everything emits. We all enjoy discussing the design > > >strategy, but I haven't given out enough info to get much help on > > >that. Where I need the help is a treatment of what frequencies > > >things emit (Particularly people and the sun). > > > > > > > > > > > Are talking about optical wavelengths? There are a lot of sites where > > you can find solar spectra under different conditions. I can't give > > away too much info, but there exists extremely small optical bandpass > > glass filters (I have used a Schott filter..). > > Thanks. This is annoying me big time as everyone is talking spectra but > not so many give numbers. I'll look again. Maybe iut was just a poor > choice of earch eywords. > -- > > With best Regards, > > > Declan Moriarty. > -- > Author: Declan Moriarty > INET: [EMAIL PROTECTED] > > Fat City Network Services -- 858-538-5051 http://www.fatcity.com > San Diego, California -- Mailing list and web hosting services > --------------------------------------------------------------------- > To REMOVE yourself from this mailing list, send an E-Mail message > to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in > the message BODY, include a line containing: UNSUB CHIPDIR-L > (or the name of mailing list you want to be removed from). You may > also send the HELP command for other information (like subscribing). > -- Author: Robert Smith INET: [EMAIL PROTECTED] Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB CHIPDIR-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
