Optics and Precision Engineering, Volume. 16, Issue 7, 1203(2008)
Extrapolation method to extend dynamic range of Shack-Hartmann wave-front sensor
A software-based method called extrapolation method was presented to overcome the trade-off between the sensitivity and the dynamic range of displacement of Shack-Hartmann Wave-front Sensor(HS).Firstly,a beginning focal-spot of a random sub-aperture(A) was obtained,and the focal-spots of the neighbor sub-apertures(B) on A were found through the extrapolation method.By taking a focal-spot of B as the beginning point,the focal-spots of the neighbor sub-apertures on B could be obtained.In the same way,the other focal-spots could also be obtained.In order to demonstrate the feasibility and practicability of the extrapolation method,an experiment was carried out.The results show that the extrapolation method can restore the wave-front while the aberration of the incident wave-front is about twice that of dynamic range of HS,which can satisfy measurement requirements for the large dynamic range and high sensitivity of HS.
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LI Hua-qiang, SONG He-lun, RAO Chang-hui, RAO Xue-jun. Extrapolation method to extend dynamic range of Shack-Hartmann wave-front sensor[J]. Optics and Precision Engineering, 2008, 16(7): 1203
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Received: Nov. 2, 2007
Accepted: --
Published Online: Feb. 28, 2010
The Author Email: Hua-qiang LI (l_h_q_@163.com)
CSTR:32186.14.