CODE V Enewsletter

February 2016

New Thermal Analysis Tool - EnvPik

Thermal analysis in CODE V has historically been done with the Environmental Analysis (ENV) option, where all elements are assumed to be separated by spacers. As temperature and pressure change, the lenses and airspaces will change per their dn/dT value, while the contact point between the lens elements and spacers is determined as if the whole assembly sits vertically and gravity holds it together.  This perturbation is done at the requested temperature and pressure only.

A more typical mounting structure is to machine seats where the lens surface contacts the housing, and the lens is held in place by a retaining ring. As shown below, these seats can be on the front or back of the lens, which can have a concave or convex surface curvature.

CODE V now has the ability to model these mounting setups via a tool called EnvPik. EnvPik will automatically add indicator surfaces so that lens elements move relative to each other consistent with the mounting structure. Due to the complex logic needed to insert these surfaces, it only handles axially symmetric systems. Zoom positions are automatically added to the original lens model (which can be initially zoomed as well), so that the end result is a system that models all desired temperatures. Now the system can be analyzed and optimized over the necessary temperature range.

Furthermore, since glass selection is crucial to athermalizing a design, special considerations have been added to run Glass Expert on this thermally zoomed system. Any custom optimization sequence can be used and will automatically be modified to include constraints necessary to maintain the surface mounts and thermal relationships in the model.

Below is a simple system where the blue surfaces indicate the location of seat mounts. This system is zoomed to handle -100 to +100 deg C, and the performance results are shown before and after using Glass Expert (~10 minute run time on a standard PC).

Before Glass Expert

Before Glass Expert

After Glass Expert

After Glass Expert

EnvPik and more information can be downloaded on the Customer Support Portal.

If you have any questions or if you would like to contact the CODE V Technical Support team, please email us at

CODE V Glass Catalog Updates Available for Download

Updates to the CODE V glass catalog, including the CDGM, Ohara, Schott and Sumita manufacturers' catalogs, are now available for download from Download links and installation instructions can be found on this page. For information about glasses affected by this update, refer to the history of CODE V glass database on our website.

Please note that the glass catalog files are in XML format, and are compatible only with CODE V version 10.8 or later.

CODE V 10.8 Webinar Recording Available

The CODE V 10.8 webinar recording from January 28 is now available on our Customer Support Portal. This webinar covers several Macro-PLUS enhancements and the inclusion of the NHG glass catalog. Learn more about these features, along with:

  • Improved LightTools® export
  • Conic constant support for the Forbes Qbfs surface type

Save the Date: 2016 CODE V User Group Meetings

We are pleased to announce the dates and locations of the 2016 CODE V User Group Meetings:

  • June 2 – Rochester, New York
  • June 7 – Pasadena, California
  • June 14 –Mountain View, California

Current users of CODE V are invited to attend this free one-day meeting. The meetings will assume basic familiarity with CODE V, though there are no specific prerequisites. Topics will be announced in future enews.

For more information, send an email to