Co-phasing of segmented mirrors using pyramid sensor

被引:23
作者
Esposito, S [1 ]
Pinna, E [1 ]
Tozzi, A [1 ]
Stefanini, P [1 ]
Devaney, N [1 ]
机构
[1] Osserv Astrofis Arcetri, I-50125 Florence, Italy
来源
ASTRONOMICAL ADAPTIVE OPTICS SYSTEMS AND APPLICATIONS | 2003年 / 5169卷
关键词
D O I
10.1117/12.511507
中图分类号
TH7 [仪器、仪表];
学科分类号
0804 ; 080401 ; 081102 ;
摘要
All the projects of the Extremely Large Telescopes (ELTs) are based on segmented primary mirrors. This idea, solving the problem of producing single mirrors having diameter larger than 8m, introduces the needs for an accurate co-phasing of the various segments. The paper presents some laboratory measurements aimed to investigate the use of the pyramid sensor as co-phasing sensor. The pyramid sensor behavior in measuring a differential piston of the incoming wavefront is analyzed in lab using interferometric measurements as reference. The obtained results show that the sensor can measure the differential piston with an accuracy better than 16nm on the whole measurement range 0-2pi. Finally the sensor sensitivity i.e. the ratio between sensor signal and differential piston amplitude as a function of the tilt modulation is measured. Using the measured sensitivity values we estimate that the residual differential piston wavefront error due to pure photon noise, considering 2m(2) area segments and a 15 R mag star is 7.4nm.
引用
收藏
页码:72 / 78
页数:7
相关论文
共 12 条
[1]  
ANDERSEN T, 2002, P SOC PHOTO-OPT INS, V4840, P214
[2]  
[Anonymous], P SPIE
[3]   Phasing the mirror segments of the Keck telescopes II: the narrow-band phasing algorithm [J].
Chanan, G ;
Ohara, C ;
Troy, M .
APPLIED OPTICS, 2000, 39 (25) :4706-4714
[4]   Phasing the primary mirror segments of the Keck telescopes: A comparison of different techniques [J].
Chanan, G ;
Troy, M ;
Ohara, C .
OPTICAL DESIGN, MATERIALS, FABRICATION, AND MAINTENANCE, 2000, 4003 :188-202
[5]  
CHANAN GA, 2002, P SOC PHOTO-OPT INS, V4840, P367
[6]   The eye of the beholder: Designing the owl [J].
Dierickx, P ;
Beckers, JL ;
Brunetto, E ;
Conan, R ;
Fedrigo, E ;
Gilmozzi, R ;
Hubin, N ;
Koch, F ;
Le Louarn, M ;
Marchetti, E ;
Monnet, G ;
Noethe, L ;
Quattri, M ;
Sarazin, M ;
Spyromilio, J ;
Yaitskova, N .
FUTURE GIANT TELESCOPES, 2003, 4840 :151-170
[7]   Laboratory test of a pyramid wavefront sensor [J].
Esposito, S ;
Feeney, O ;
Riccardi, A .
ADAPTIVE OPTICAL SYSTEMS TECHNOLOGY, PTS 1 AND 2, 2000, 4007 :416-422
[8]  
Esposito S., 2002, P SOC PHOTO-OPT INS, V4839, P164
[9]  
ESPOSITO S, 2001, P CONV AD OPT, P161
[10]   Pupil plane wavefront sensing with an oscillating prism [J].
Ragazzoni, R .
JOURNAL OF MODERN OPTICS, 1996, 43 (02) :289-293