Laser beam deflectometry based on a subpixel resolution algorithm



Downloads per month over past year

Canabal Boutureira, Héctor and Alonso Fernández, José and Bernabeu Martínez, Eusebio (2001) Laser beam deflectometry based on a subpixel resolution algorithm. Optical Engineering, 40 (11). pp. 2517-2523. ISSN 0091-3286

Official URL:


A deflectometric method for the characterization of optical systems is presented. It is based on the use of a CCD camera and a subpixel resolution algorithm for the measurement of the deflection of a laser beam that propagates through the system. To obtain accurate results, three different algorithms for measuring the position of the deflected beam are tested and compared. Based on this comparison, an algorithm based on the calculation of the phase of the fast Fourier transform (FFT) is selected, and an accuracy of 0.024 pixels is obtained on the determination of the beam position in our setup. Using an XY scanning stage, the proposed method is completely automated and applied for the characterization of ophthalmic lenses. In this application, the gradients of the wavefront refracted by the lens are measured directly, and from them, the thickness and the local power of the lens are computed.

Item Type:Article
Additional Information:

© Society of Photo-Optical Instrumentation Engineers.
This research was supported by the Comisión Interministerial de Ciencia y Tecnologia under Project No. TAP 98/0701.

Uncontrolled Keywords:Deflectometry, Subpixel, Experimental Ray Tracing, Position Sensing
Subjects:Sciences > Physics > Optics
ID Code:26782
Deposited On:25 Sep 2014 10:51
Last Modified:25 Sep 2014 10:51

Origin of downloads

Repository Staff Only: item control page