Abstract
A robust charge-coupled device (CCD) photoelectric autocollimator for outdoor
use is designed and demonstrated. The influence of outdoor conditions on the
signal-to-noise ratio (SNR) and imaging quality of the measuring system is
experimentally analyzed. The pulse width modulation technology is applied to the
automatic feedback control of the actively regulated illuminating light source of
the measuring system to maximize SNR while avoiding image saturation. A Fourier
phase shift method for subpixel estimation is adopted to achieve high-accuracy
measurement in the presence of noises. Experimental results indicate that the
technologies proposed here largely improve the measuring stability, dynamic range,
and accuracy of the CCD photoelectric autocollimator used outdoors.
© 2011 Chinese Optics Letters
PDF Article
More Like This
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 Optica member, or as an authorized user of your institution.
Contact your librarian or system administrator
or
Login to access Optica Member Subscription