>   
   > >>   
   >   
   > > And you can measure the spectrum with that nifty Ocean   
   >   
   > > spectrophotometer you have. What kind of output does it have? BTW, I   
   >   
   > > remember your rotating a diffraction grating on a servo - Would it be   
   >   
   > > feasible to make a "home brew" spectrometer or would this be a big   
   >   
   > > reach?   
   >   
   >   
   >   
   > It isn't all that difficult, except for making the fibre bundle.  Mine   
   >   
   > was all built out of Microbench stuff from my drawer, plus some toy   
   >   
   > parts.  (You can get servos with magnetic encoders now, and with a $40   
   >   
   > programmer, you can reduce the size of the dead zone, which would have   
   >   
   > helped the repeatability of mine.  A preload spring would have been a   
   >   
   > good idea too.)   
   >   
   >   
   >   
   > The other issue is keeping the stray light down, which takes a certain   
   >   
   > healthy paranoia.  I used a lens instead of a mirror to collimate the   
   >   
   > light on the grating side, and a near-Littrow configuration to save   
   >   
   > alignment.   
   >   
   >   
   >   
   > Most of the fine mechanical stuff (e.g. the fixtures for aligning the   
   >   
   > fibre bundle) was made from JB Weld epoxy.  A fun project all round.   
   >   
   >   
   >   
   > Cheers   
   >   
   >   
   >   
   > Phil   
      
   Be good to get more details on that. Part of the back axle of my car held with   
   JB Weld. I cured that one carefully. Microbench?   
   jb   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)