When adaptive optics is applied to target identification, laser high beam quality transmission and other fields, extended object wavefront detection is a technical challenge. And the detection accuracy directly affects the adaptive optics correction effect. To investigate the problem that the focal length of microlens affects the accuracy of extended target wavefront detection. In this paper, a simulation model of extended target wavefront detection based on correlated Hartmann's variable focus was established. The model was based on the commonly used optical system parameters, and it was also established by using the theories of Fresnel diffraction, Newton's imaging equation, the working principle of Shack-Hartmann wavefront detector, and wavefront reconstruction. We analyzed the effect of microlens focal length variation on the wavefront detection accuracy. The relationship curves between the wavefront reconstruction residuals RMS, PV and microlens focal length were obtained. And we further analyzed the intrinsic physical reasons for this relationship.The results show that the variation of the microlens focal length affected the point spread function used in the algorithm.The smaller the focal length, the more accurate the corresponding point spread function calculation results. Therefore, the smaller the calculation error of the subaperture offset, the higher the wavefront detection accuracy.
When adaptive optics is applied to target imaging, laser atmospheric transmission, etc., variable extension target wavefront detection is a technical challenge. And its detection accuracy directly affects the correction effect of adaptive optics.In order to explore the wavefront detection accuracy problem of variable extension targets. In this paper, a simulation model for wavefront detection of variable extension targets with correlated Hartmann was developed. The model was based on the commonly used optical system parameters, and it was also established by using the theories of Fresnel diffraction, Newton's imaging equation, the working principle of Shack-Hartmann wavefront detector, and wavefront recovery.We analyzed the effects of target distance and attitude variations on wavefront detection accuracy. The relationship curves between RMS and PV of wavefront recovered residuals and target distance and different attitudes were obtained in the simulation. And we further carried out the analysis for the intrinsic physical reasons of forming this relationship. The results show that target distance and attitude changes affected the extension of targets within the Hartmann subaperture. When the wavefront was recovered using the correlation algorithm, we obtained that the smaller the extension, the higher the wavefront detection accuracy within the relevant Hartmann detection accuracy. Therefore, it could be summarized that the smaller the extension of the target, the more similar it was to the point target, then the detection error introduced by the extension became smaller.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.