CI Systems has developed a new cost effective and modular Optical Test Bench to measure Modulation Transfer
Function (MTF) and transmittance of optical components in the Visible/Near Infrared (0.4-1.7 microns) and infrared (3
to 14 microns) spectral ranges (the OPTISHOP system). The optical design concept of the system allows the user to
switch from MTF (on- and off-axis) to transmittance measurements, without need of optical alignment by the user. In
addition, broad band sources are used for illumination, so that these optical properties can be measured in the whole
relevant wavelength range of the components to be tested (usually visible and/or near infrared separately from the
infrared range). Other lens measurements such as effective focal length can be made. Back focal length, distortion and
field curvature are being developed.
The system is based on the standard and proven CTS (Collimator Test System) product line of CI, which is made of
reflective optics for wide wavelength coverage, and it is ruggedly built for use in the laboratory, production line or
maintenance depot. An advantage of the CTS configuration is that the source-collimator assembly is enclosed in a robust
mechanical envelope, which prevents accidental misalignements and breakage, optical misalignments due to
environment temperature drifts, soiling of the optics, and easier system transportation.
The system is described here, including calibration and validation techniques.