Tek-Tips is the largest IT community on the Internet today!

Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!

Register Log in
  • Congratulations cowski on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Recent content by cev

  1. cev

    Where can I get copper pipe 6" dia

    The problem is that I'm an optical engineer and I don't quite know who to call that can help me. That's why I'm asking for assistance.
  2. cev

    Where can I get copper pipe 6" dia

    I'm looking for a short length (10-12") of DWV copper pipe, 6" ID preferable, 5" is acceptable, in Atlanta. I can't find anyone selling this online. Thanks, CV
  3. cev

    running an executable in matlab

    Since it's a handle error, I am guessing that your program is attempting to create output (e.g., write to stdout, create a plot window, etc.), but matlab is unable to process this output. CV
  4. cev

    Mean and Standard Deviation of the entire matrix

    1. The purpose of z-scores is to allow the comparison of data from different statistical distributions. What you need to do first is quantitatively determine which data are sampled from different distributions. I don't have MEG experience, but I suspect that data from each condition and each...
  5. cev

    law of reciprocity at critical angle

    All light at angles greater than *or equal to* the critical angle is completely reflected, Therefore there is no problem with reciprocity. Best, Curtis
  6. cev

    bending a laser with magnets?

    Light has no charge, and cannot be bent other than by matter or gravity. CV
  7. cev

    retrofit for new lab

    All, I am in the early stages of remodeling an office space into a laboratory (the space is generally quite amenable to the intended application). The intended user would like to minimize dust, but we do not have the financial resources to do a true cleanroom. The room gets HVAC from the...
  8. cev

    MATLAB to control the serial port voltage

    If you are trying to do a binary switch, the parallel port would be your best choice. The matlab data acquisition toolbox has support for parallel port operations. A quick web search turned up several other options. Here is one that describes one of the harder techniques...
  9. cev

    Animate a graph and export to Powerpoint?

    It is very simple to make an avi file with the AVIFILE function. I use the 'Cinepak' compression option, but I frequently encounter colormap errors for very large data sets. C
  10. cev

    Plotting Three Column Vectors As A Surface

    The surf function only likes to plot on rectangular grids. You have two options: 1. Use the griddata function to interpolate your vectors: [XI,YI,ZI] = griddata(x,y,z,XI,YI) 2. Hand-process your grid into a set of patches and plot each one separately using the 'patch' function. CV
  11. cev

    Use pixel density as scale

    Hmmm. Maybe I have a default setting that is different from yours. Just to be sure your colormap is the same length, try this: c = colormap(gray(256)); CV
  12. cev

    Use pixel density as scale

    you can edit the colormap however you please. I think you might mean something like this ... % start with a colormap of increasing grayscale density c=colormap(gray); c(:,[2:3])=0; % zero the green and blue entries colormap(c); % load the custom colormap CV
  13. cev

    Light filter around 592 nm

    You should realize that the interference filter test may be difficult to pull off with untrained labor. The center wavelength of interference filters varies like cos(theta), where theta is the zenith angle of incidence. You get a 1-nm shift for 3.3 degree misalignment and 3-nm shift for 5.8...
  14. cev

    How do i get a uniform intensity field???

    It sounds like you are using a laser diode, so your beam is probably something like gaussian. If you can confine your field of view into a small enough portion of the laser beam, you will get good uniformity. This comes at the expense of losing a lot of light. Along similar lines, you can expand...
  15. cev

    Spectral transmittance charts

    Schott's web site has lousy organization, so this page can be hard to find: http://www.us.schott.com/optics_devices/english/download/index.html CV
See more

Part and Inventory Search

Back
Top