Experimental setup proposed to measure the quality of a spherical surface using deflectometry and a Hartmann screen

23rd Congress of the International Commission for Optics

Muñoz-Potosi, A.^1 ; Díaz-Uribe, R.^2 ; Campos-García, M.^2 ; Granados-Agustín, F.^1

Coordinación de Óptica, Instituto Nacional de Astrofisica, Optica y Electronica, A.P. 51-216, Santa-María-Tonantzintla-Puebla

C.P. 72000, Mexico^1

Centro de Ciencias Aplicadas y Desarrollo Tecnológico, Universidad Nacional Autónoma de México, Ciudad Universitaria, Circuíto Exterior S/N, A.P. 70-186, Delegación Coyoacán, México D.F.

C.P. 04510, Mexico^2

关键词: Center of curvature;    General equations;    Hartmann screen;    Optical surfaces;    Quantitative information;    Radius of curvature;    Spherical surface;    Surface under tests;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/605/1/012004/pdf
DOI  :  10.1088/1742-6596/605/1/012004

来源: IOP

【 摘 要 】

Currently there are a variety of techniques to determine the quality of optical surfaces, which must provide quantitative information of the deformation or the shape of the surface under test. This paper proposes to use the deflectometry technique using a Hartmann screen to test a spherical surface of the diameter and radius of curvature known. For this, the proposed experimental setup is presented, highlighting the importance of alignment and the measures distances, location between the screen and image capture system, measured from the center of curvature of the analyzed surface. Subsequently, by using these distances, the positions of the reflected rays and the positions of location of points on the screen, you can find the equation of the line associated with these two points and given this equation, we can deduce the value of the normal surface. With this result of normalsand using the general equation of deflectometry, we will obtain the shape of the surface under test.