<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0035-001X</journal-id>
<journal-title><![CDATA[Revista mexicana de física]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. mex. fis.]]></abbrev-journal-title>
<issn>0035-001X</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Mexicana de Física]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0035-001X2004000300016</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Detección de pistón por polarimetría]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Salinas-Luna]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Luna-Aguilar]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cornejo-Rodríguez]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Astronomía Observatorio Astronómico Nacional]]></institution>
<addr-line><![CDATA[Ensenada Baja California]]></addr-line>
<country>México</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Instituto Nacional de Astrofísica Optica y Electrónica  ]]></institution>
<addr-line><![CDATA[Puebla ]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2004</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2004</year>
</pub-date>
<volume>50</volume>
<numero>3</numero>
<fpage>323</fpage>
<lpage>330</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0035-001X2004000300016&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0035-001X2004000300016&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0035-001X2004000300016&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Reportamos un método cualitativo para detectar errores de pistón en una superficie optica 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.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[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.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Espejos segmentados]]></kwd>
<kwd lng="es"><![CDATA[cofaseo]]></kwd>
<kwd lng="es"><![CDATA[polarización]]></kwd>
<kwd lng="es"><![CDATA[detección de pistón]]></kwd>
<kwd lng="es"><![CDATA[alineación de la fase]]></kwd>
<kwd lng="es"><![CDATA[senso de curvatura]]></kwd>
<kwd lng="en"><![CDATA[Segmented mirrors]]></kwd>
<kwd lng="en"><![CDATA[polarization]]></kwd>
<kwd lng="en"><![CDATA[cophasing and piston detection]]></kwd>
<kwd lng="en"><![CDATA[curvature sensing]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  	    <p align="justify"><font face="verdana" size="4">Instrumentaci&oacute;n</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="4"><b>Detecci&oacute;n de pist&oacute;n por polarimetr&iacute;a</b></font></p>  	    <p align="center"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="2"><b>J. Salinas&#45;Luna*, E. Luna&#45;Aguilar*</b><i><b>,</b></i> <b>A. Cornejo&#45;Rodr&iacute;guez**</b></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><i>* Observatorio Astron&oacute;mico Nacional, Instituto de Astronom&iacute;a, OAN, IA&#45;UNAM Apartado Postal 877, Ensenada, B.C., 22830, M&eacute;xico,</i> <i>Tel: (01&#45;646)1 74 45 80 y 74 45 48, ext 250, 239,</i> E&#45;mail: <a href="mailto:jsl@astrosen.unam.mx">jsl@astrosen.unam.mx</a>, <a href="mailto:eala@astrosen.unam.mx">eala@astrosen.unam.mx</a></font></p>  	    <p align="justify"><font face="verdana" size="2"><i>** Instituto Nacional de Astrof&iacute;sica &Oacute;ptica y Electr&oacute;nica, INAOE, Apartado Postal 216, Puebla Pue. 72000, M&eacute;xico, Tel:(01&#45;222)2 47 2011</i> E&#45;mail:<a href="mailto:acornejo@inaoep.mx">acornejo@inaoep.mx</a></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Recibido el 30 de mayo de 2003;    <br> 	Aceptado el 8 de diciembre de 2003.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Resumen</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Reportamos un m&eacute;todo cualitativo para detectar errores de pist&oacute;n en una superficie optica segmentada. Esta prueba es realizada iluminando una superficie segmentada con un frente de onda esf&eacute;rico proveniente de un haz linealmente polarizado. El comportamiento angular de los vectores de polarizaci&oacute;n en el haz reflejado es analizado haciendo mediciones experimentales de los par&aacute;metros 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 di&aacute;metro y radio de curvatura paraxial, respectivamente.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Descriptores:</b> Espejos segmentados; cofaseo; polarizaci&oacute;n; detecci&oacute;n de pist&oacute;n; alineaci&oacute;n de la fase; senso de curvatura.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Abstract</b></font></p>  	    <p align="justify"><font face="verdana" size="2">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.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Keywords:</b> Segmented mirrors; polarization; cophasing and piston detection; curvature sensing.</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2">PACS: 42.79.&#45;e</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><a href="/pdf/rmf/v50n3/v50n3a16.pdf" target="_blank">DESCARGAR ART&Iacute;CULO EN FORMATO PDF</a></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Agradecimientos</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Los autores queremos expresar nuestro agradecimiento al proyecto Telescopio Infrarrojo Mexicano de nueva tecnolog&iacute;a, (TIM), del IAUNAM, OAN en Ensenada B.C., M&eacute;xico, y al CONACYT por el soporte econ&oacute;mico de la beca doctoral con n&uacute;mero de registro 114488/115164 a uno de los autores de este trabajo.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Referencias</b></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">1.&nbsp;C.R. 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<ref-list>
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