An Infrared Microscope Lens for Solid-State Cameras
by Brain, Alfred E.
Technical Note 215
Institution: AI Center, SRI International
Address: 333 Ravenswood Ave, Menlo Park, CA 94025
A 4x, Numerical Aperture (N.A.) 0.1 microscope objective corrected for the range 0.5893-1.0000 microns was designed by ray tracing following the method of B. K. Johnson. A programmable calculator was used for making the calculations and the lens was constructed by Vickers Instruments. The spectral correction of the design has been explored in detail, and spherochromatism curves covering the range 0.4340-1.2500 microns are presented. Because in experimental equipment the lens is likely to be used at magnifications other than 4x, spherical-aberration curves were computed for magnifications in the range 1 .9-5.4. No substantial reduction in capability is apparent. The practical performance of the Vickers objective has been evaluated by examining a metal mesh with a pitch of 500/inch using a Reticon 512-element linear array. The appendix contains a brief discussion on the application of programmable calculators to ray tracing for lens design.
|Brain, Alfred (Ted) E.||Alumnus|