A power-saving modulation technique for time-of-flight range imaging sensors

Richard M. Conroy; Adrian A. Dorrington; Andrew D. Payne; Rainer Künnemeyer; Michael J. Cree

doi:10.1117/12.889729

21 June 2011 A power-saving modulation technique for time-of-flight range imaging sensors

Richard M. Conroy, Adrian A. Dorrington, Andrew D. Payne, Rainer Künnemeyer, Michael J. Cree

Proceedings Volume 8085, Videometrics, Range Imaging, and Applications XI; 808506 (2011) https://doi.org/10.1117/12.889729
Event: SPIE Optical Metrology, 2011, Munich, Germany

Abstract

Time-of-flight range imaging cameras measure distance and intensity simultaneously for every pixel in an image. With the continued advancement of the technology, a wide variety of new depth sensing applications are emerging; however a number of these potential applications have stringent electrical power constraints that are difficult to meet with the current state-of-the-art systems. Sensor gain modulation contributes a significant proportion of the total image sensor power consumption, and as higher spatial resolution range image sensors operating at higher modulation frequencies (to achieve better measurement precision) are developed, this proportion is likely to increase. The authors have developed a new sensor modulation technique using resonant circuit concepts that is more power efficient than the standard mode of operation. With a proof of principle system, a 93-96% reduction in modulation drive power was demonstrated across a range of modulation frequencies from 1-11 MHz. Finally, an evaluation of the range imaging performance revealed an improvement in measurement linearity in the resonant configuration due primarily to the more sinusoidal shape of the resonant electrical waveforms, while the average precision values were comparable between the standard and resonant operating modes.

Citation Download Citation

Richard M. Conroy, Adrian A. Dorrington, Andrew D. Payne, Rainer Künnemeyer, and Michael J. Cree "A power-saving modulation technique for time-of-flight range imaging sensors", Proc. SPIE 8085, Videometrics, Range Imaging, and Applications XI, 808506 (21 June 2011); https://doi.org/10.1117/12.889729

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