Payne, A.D., Dorrington, A.A., Cree, M.J. & Carnegie, D.A. (2010). Improved measurement linearity and precision for AMCW time-of-flight range imaging cameras. Applied Optics, 49(23), 4392-4403.
Permanent Research Commons link: http://hdl.handle.net/10289/4247
Time-of-flight range imaging systems utilizing the amplitude modulated continuous wave (AMCW) technique often suffer from measurement nonlinearity due to the presence of aliased harmonics within the amplitude modulation signals. Typically a calibration is performed to correct these errors. We demonstrate an alternative phase encoding approach that attenuates the harmonics during the sampling process, thereby improving measurement linearity in the raw measurements. This mitigates the need to measure the system’s response or calibrate for environmental changes. In conjunction with improved linearity, we demonstrate that measurement precision can also be increased by reducing the duty cycle of the amplitude modulated illumination source (while maintaining overall illumination power).
Optical Society of America
This article has been published in the journal: Applied Optics. © 2010 Optical Society of America