https://wiki.yanding.com/ 2026-10-09T09:37:26+00:00 https://wiki.yanding.com/ https://wiki.yanding.com/lib/tpl/myconfluence/images/favicon.ico text/html 2026-09-22T03:16:36+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.yanding.com/doku.php?id=en:yanding:image_quality_evaluation:tools:collimators:focal_length_matching&rev=1790046996&do=diff Focal-Length Matching Between the Collimator and the DUT When testing a DUT using a collimator, the collimator objective \(L_{\mathrm{col}}\) and the DUT’s imaging objective \(L_{\mathrm{DUT}}\) together form an optical imaging system. The image of the target formed by \(L_{\mathrm{col}}\) serves as the object for \(L_{\mathrm{DUT}}\)\(L_{\mathrm{col}}\)\(L_{\mathrm{col}}\)\(L_{\mathrm{DUT}}\)\(L_{\mathrm{DUT}}\)\(L_{\mathrm{col}}\)\(L_{\mathrm{col}}\)\(N\)\(L_{\mathrm{DUT}}\)\(1/N\)\(L_{\mathr… text/html 2026-09-22T08:33:45+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.yanding.com/doku.php?id=en:yanding:image_quality_evaluation:tools:collimators:object_distance_calculation&rev=1790066025&do=diff Object Distance Calculation for Collimators Collimators are designed for a target at infinity. However, in practical applications, the object distance that produces the sharpest image on the DUT may be finite. According to the principles of lens imaging, when the target is located outside or inside the focal plane of the collimating objective Lcol, it forms an image at a finite positive or negative distance, respectively. A collimator with an adjustable target position is called a variable obje… text/html 2026-08-07T02:22:00+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.yanding.com/doku.php?id=en:yanding:image_quality_evaluation:tools:collimators:pupil_matching&rev=1786069320&do=diff Collimator–DUT Pupil Matching The exit pupil (ExP) is the image of the aperture stop formed by the optical elements that lie between the stop and the image plane. It serves as the common opening through which all rays leave the optical system, and its centre is located at the intersection of the chief rays in image space. text/html 2026-07-28T06:15:24+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.yanding.com/doku.php?id=en:yanding:image_quality_evaluation:tools:collimators:structure&rev=1785219324&do=diff Collimator Structure With the increasing use of digital cameras in road vehicles, aircraft, head-mounted displays, and security systems, the testing and calibration of cameras targeting distant objects has become essential in development, production, and validation. Whether constrained by the limited space of an optical laboratory or the compact footprint of automated production equipment, the collimator is the inevitable choice for simulating distant targets within a confined physical space.