On Tuesday, April 15, 2014 2:52:09 PM UTC-4, Phil Hobbs wrote:   
   > On 04/15/2014 12:15 PM, haiticzare2011@gmail.com wrote:   
   >   
   > > snip   
   >   
   > >>   
   >   
   > >>   
   >   
   > >>> 1. How daunting is it to whip up a FTNIR?   
   >   
   > >>   
   >   
   > >>   
   >   
   > >>   
   >   
   > >> Hard.  The motion precision is the first issue, and keeping the detected   
   >   
   > >>   
   >   
   > >> amplitude stable throughout the motion is the second.  Then there's   
   >   
   > >>   
   >   
   > >> calibration.   
   >   
   > >   
   >   
   > >   
   >   
   > > Motion aside, how difficult is it to put together the optics of an FTIR?   
   >   
   > >   
   >   
   >   
   >   
   > It's the motion that's hard.  I've never built one myself, but AFAICT   
   >   
   > the rest of it isn't that much harder than aligning a gas laser.   
   >   
   > Getting it dialled in really right might be a bit slow if you don't have   
   >   
   > a nice fast scan speed.   
   >   
   >   
   >   
   > Motion irregularities in FTIR are a lot like sampling clock jitter in a   
   >   
   > direct-sampling digital radio, except that, being mechanical, they're   
   >   
   > usually much less well behaved.   
   >   
   >   
   >   
   > Cheers   
   >   
   >   
   >   
   > Phil Hobbs   
   >   
   >   
   >   
   > --   
   >   
   > Dr Philip C D Hobbs   
   >   
   > Principal Consultant   
   >   
   > ElectroOptical Innovations LLC   
   >   
   > Optics, Electro-optics, Photonics, Analog Electronics   
   >   
   >   
   >   
   > 160 North State Road #203   
   >   
   > Briarcliff Manor NY 10510   
   >   
   >   
   >   
   > hobbs at electrooptical dot net   
   >   
   > http://electrooptical.net   
      
   what catches my eye is a large difference in wavelength discrimination with   
   NIR FTIR. When I first saw the comparaative spectra plots, I suspected the   
   effect was an artifact...(IOW peaks showed up in the ftir sample that weren't   
   there in the dispersive sample....)   
   was a   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)