tailieunhanh - A chromatic aberration-measuring method for refracted converging lens based on foucault knife - DGE test

The paper proposes a new chromatic-aberration-measuring method for geometric optics of a single converging lens based on the Foucault knife-edge test. An opto-mechatronics measurement system aided by a computer vision was built to automatically determine displaced positions of the knife-edge for discovering chromatic aberration components in the measured lenses. | Journal of Science & Technology 122 (2017) 001-006 A Chromatic Aberration-Measuring Method for Refracted Converging Lens based on Foucault Knife - Edge Test Nguyen Thanh Dong*, Vu Toan Thang Hanoi University of Science and Technology, No. 1, Dai Co Viet, Hai Ba Trung, Hanoi, Viet Nam Received: August 10, 2016; Accepted: November 03, 2017 Abstract The paper proposes a new chromatic-aberration-measuring method for geometric optics of a single converging lens based on the Foucault knife-edge test. An opto-mechatronics measurement system aided by a computer vision was built to automatically determine displaced positions of the knife-edge for discovering chromatic aberration components in the measured lenses. The evaluation results of its chromatic aberration elements measured by this system are appropriated with theoretical calculations. Keywords: Chromatic aberration in a lens, Foucault knife-edge test, Abbe index, computer vision 1. Introduction * illumination conditions in a laboratory and not need for a dark room. In addition, it serves to eliminate in the loop human vision operation that is susceptible to human judgment and subjectivity. The Foucault knife-edge test is one of the oldest and most conventional techniques for sensing optical aberrations. It has become widely used for the observation and measurement of chromatic aberration, which is one of essential aberration components of a single converging lens or a convex mirror, reported by [1-6]. In optical manufacturing and metrology methods, the measuring method capable of quantitatively and efficiently measuring the deformation of aspherical mirrors is built by using the useful and economical technique as the Foucault knife-edge test [3]. Besides, the Foucault tester is improved by the combination of an electronic detector array and a digital microprocessor to estimate quantitative of optical surfaces in comparing to its results with that of interferometry-measuring techniques [4]. Furthermore, the .