CMOS array of photodiodes with electronic processing for 3D optical reconstruction

Gemma Hornero; Enric Montane; Genis Chapinal; Mauricio Moreno; Atila Herms

doi:10.1117/12.424889

13 April 2001 CMOS array of photodiodes with electronic processing for 3D optical reconstruction

Gemma Hornero, Enric Montane, Genis Chapinal, Mauricio Moreno, Atila Herms

Proceedings Volume 4298, Three-Dimensional Image Capture and Applications IV; (2001) https://doi.org/10.1117/12.424889
Event: Photonics West 2001 - Electronic Imaging, 2001, San Jose, CA, United States

Abstract

It is well known that laser time-of-flight (TOF) and optical triangulation are the most useful optical techniques for distance measurements. The first one is more suitable for large distances, since for short range of distances high modulation frequencies of laser diodes (»200-500MHz) are needed. For these ranges, optical triangulation is simpler, as it is only necessary to read the projection of the laser point over a linear optical sensor without any laser modulation. Laser triangulation is based on the rotation of the object. This motion shifts the projected point over the linear sensor, resulting on 3D information, by means of the whole readout of the linear sensor in each angle position. On the other hand, a hybrid method of triangulation and TOF can be implemented. In this case, a synchronized scanning of a laser beam over the object results in different arrival times of light to each pixel. The 3D information is carried by these delays. Only a single readout of the linear sensor is needed. In this work we present the design of two different linear arrays of photodiodes in CMOS technology, the first one based on the Optical triangulation measurement and the second one based in this hybrid method (TFO). In contrast to PSD (Position Sensitive Device) and CCDs, CMOS technology can include, on the same chip, photodiodes, control and processing electronics, that in the other cases should be implemented with external microcontrollers.

Citation Download Citation

Gemma Hornero, Enric Montane, Genis Chapinal, Mauricio Moreno, and Atila Herms "CMOS array of photodiodes with electronic processing for 3D optical reconstruction", Proc. SPIE 4298, Three-Dimensional Image Capture and Applications IV, (13 April 2001); https://doi.org/10.1117/12.424889

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