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Revista mexicana de astronomía y astrofísica

Print version ISSN 0185-1101

Rev. mex. astron. astrofis vol.44 n.2 Ciudad de México Oct. 2008

 

Analysis of chromatic effects in the shift–and–add method

 

V. G. Orlov and V. V. Voitsekhovich

 

Instituto de Astronomía, Universidad Nacional Autónoma de México, Apdo. Postal 70–264, 04510 México, D. F., México. (orlov@astroscu.unam.mx, voisteko@astroscu.unam.mx).

 

Received 2008 March 10
Accepted 2008 July 3

 

RESUMEN

Se estudian los efectos cromáticos en sistemas de óptica adaptativa de "desplazar y sumar" ("Shift–And Add", SAA) mediante simulaciones numéricas. Los efectos cromáticos que investigamos surgen cuando se efectuan medidas y correcciones a distintas longitudes de ondas. El estudio de las propiedades cromáticas de la técnica SAA es útil para el diseño de sistemas de óptica adaptativa SAA. También es importante para la reducción de datos de observación obtenidos mediante espectroscopia de motas. Se presenta la comparación de dos técnicas: SAA y "tip–tilt", y se senalan las ventajas de los sistemas adaptativos SAA.

 

ABSTRACT

Chromatic effects in shift–and–add (SAA) adaptive systems are considered by means of computer simulations. Chromatic effects under investigations arise when measurements and corrections are performed in different wavelengths. A study of chromatic properties of SAA technique is useful for designing of SAA adaptive systems. Also it is important for data reduction of speckle–spectroscopic observations. The comparison of two approaches of low order adaptive corrections (SAA and tip–tilt) is presented. The advantages of SAA adaptive systems are outlined.

Key Words: instrumentation: adaptive optics — techniques: high angular resolution — techniques: interferometric — techniques: speckle.

 

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