Uniformity Measurements Using Focal Plane Targets

A test technique for measuring the uniformity of an electrooptical imaging device is presented. The technique consists of using standard targets such as large aperture and four-bar targets located in the focal plane of a collimator. Thus, the need for a separate, large uniform target is eliminated. Experimental results for a vidicon camera and for a CCD camera show that the large aperture target is a better choice than the four-bar target.