REPORTAMOS UN MÉTODO CUALITATIVO PARA DETECTAR ERRORES DE PISTÓN EN UNA SUPERFICIE ÓPTICA SEGMENTADA. ESTA PRUEBA ES REALIZADA ILUMINANDO UNA SUPERFICIE SEGMENTADA CON UN FRENTE DE ONDA ESFÉRICO PROVENIENTE DE UN HAZ LINEALMENTE POLARIZADO. EL COMPORTAMIENTO ANGULAR DE LOS VECTORES DE POLARIZACIÓN EN EL HAZ REFLEJADO ES ANALIZADO HACIENDO MEDICIONES EXPERIMENTALES DE LOS PARÁMETROS DE STOKES U Y Q, ROTANDO EL ANALIZADOR PARA CUATRO POSICIONES (0, 45, 90 Y 135 GRADOS). EL ESPEJO UTILIZADO PARA ESTA PRUEBA TIENE 20 Y 120 CM DE DIÁMETRO Y RADIO DE CURVATURA PARAXIAL, RESPECTIVAMENTE.AbstractWE REPORT A QUALITATIVE METHOD TO DETECT PISTON ERRORS IN AN OPTICAL SEGMENTED SURFACE. THE TEST CONSISTS OF ILLUMINATING A SEGMENTED SURFACE, WITH A SPHERICAL WAVEFRONT COMING FROM A LINEARLY POLARIZED BEAM. THE BEHAVIOR OF THE VECTORS OF POLARIZATION OF THE LIGHT IN THE REFLECTED BEAM ARE ANALYZED DOING THE EXPERIMENTAL MEASUREMENT OF THE STOKES PARAMETERS U AND Q, ROTATING THE ANALYZER FOR FOUR POSITIONS OF 0, 45, 90 AND 135 DEGREES. THE MIRROR USED FOR THIS TEST HAS 20 AND 120 CENTIMETERS FOR THE DIAMETER AND THE PARAXIAL RADIUS OF CURVATURE, RESPECTIVELY.WE REPORT A QUALITATIVE METHOD TO DETECT PISTON ERRORS IN AN OPTICAL SEGMENTED SURFACE. THE TEST CONSISTS OF ILLUMINATING A SEGMENTED SURFACE, WITH A SPHERICAL WAVEFRONT COMING FROM A LINEARLY POLARIZED BEAM. THE BEHAVIOR OF THE VECTORS OF POLARIZATION OF THE LIGHT IN THE REFLECTED BEAM ARE ANALYZED DOING THE EXPERIMENTAL MEASUREMENT OF THE STOKES PARAMETERS U AND Q, ROTATING THE ANALYZER FOR FOUR POSITIONS OF 0, 45, 90 AND 135 DEGREES. THE MIRROR USED FOR THIS TEST HAS 20 AND 120 CENTIMETERS FOR THE DIAMETER AND THE PARAXIAL RADIUS OF CURVATURE, RESPECTIVELY.