Noncontact distance sensor using spatial signal processing.

  title={Noncontact distance sensor using spatial signal processing.},
  author={Nabeel A. Riza and Syed Azer Reza},
  journal={Optics letters},
  volume={34 4},
To the best of our knowledge, proposed is the first distance-measurement sensor using direct spatial signal processing. The sensor is implemented using a laser beam engaged in target-dependent spatial beam processing using an electronically controlled variable focus lens (ECVFL). Specifically, the target-reflected beam is observed by an optical detector while electronically scanning the focal length of the ECVFL in the path of the laser beam. A received-beam minimum spatial size corresponds to… CONTINUE READING