Abstract

A theoretical and experimental comparison of photon-counting cameras and CCD’s for use in astronomical speckle imaging was performed. Photon-counting cameras able to detect single-photon events typically exhibit a lower quantum efficiency (QE) and suffer saturation effects at high light levels. In contrast, CCD’s offer a high QE and virtually unlimited photon-count rate. However CCD’s are limited at lower light levels by noise associated with the readout process. Speckle-imaging performance was quantified by derivation of the signal-to-noise ratio (SNR) of the power spectrum and the Knox–Thompson product to include CCD readout noise. Ground-based telescope observations at various light levels were obtained with an advanced, high-speed, low-noise CCD camera to verify SNR expressions. The useful operating ranges for these two camera types were compared by consideration of the effects of QE, readout noise, and maximum photon-count rate. Although photon-counting cameras continued to dominate low-light-level applications, CCD’s are shown to offer significant improvements over photon-counting cameras for a wide range of light levels. Future reductions of readout noise will further improve CCD speckle-imaging performance.

© 1998 Optical Society of America

Full Article  |  PDF Article

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Figures (6)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Tables (2)

You do not have subscription access to this journal. Article tables are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Equations (12)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Metrics

You do not have subscription access to this journal. Article level metrics are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription