A CMOS sensor optimized for laser spot-position detection

Author

De Nisi, Fabrizio ; Comper, Fiorenzo ; Gonzo, Lorenzo ; Gottardi, Massimo ; Stoppa, David ; Simoni, Andrea ; Beraldin, J. Angelo

Author_Institution

Centre for Sci. & Technol. Res. ITC-IRST, Povo Trento, Italy

Volume

5

Issue

6

fYear

2005

Firstpage

1296

Lastpage

1304

Abstract

An optical sensor architecture optimized for flying-spot, triangulation-based, three-dimensional (3-D) laser scanners will be presented. The architecture implements a spot-position detection algorithm based on a two-step procedure that allows for improved dynamic range and readout speed. The sensor, which contains two linear arrays of pixels, analog readout channels, and digital signal preprocessing circuitry, has been fabricated in 0.6-μm CMOS double-poly triple-metal technology and measures 8.17×5.67 mm². Pixel size and shape have been selected for reducing the effect of laser speckle and for the possibility of measuring color in a multiwavelength 3-D scanner. Electrooptical test results confirm the sensor behavior as expected from simulations on a dynamic range of 80 dB and exhibits a maximum speed of 50-k voxel/s.

Keywords

CMOS image sensors; optical scanners; optical sensors; optical variables measurement; position measurement; 0.6 micron; 3D laser scanners; 5.67 mm; 8.17 mm; CMOS sensor; digital signal preprocessing circuit; double-poly triple-metal technology; electrooptical test; flying spot; laser speckle; laser spot-position detection; multiwavelength 3D scanne; optical sensor architecture; readout channels; spot position detection algorithm; CMOS analog integrated circuits; CMOS digital integrated circuits; CMOS technology; Detection algorithms; Dynamic range; Lasers and electrooptics; Optical sensors; Sensor arrays; Shape measurement; Speckle; Three-dimensional (3-D) imaging; flying-spot active triangulation; optical sensor;

fLanguage

English

Journal_Title

Sensors Journal, IEEE

Publisher

ieee

ISSN

1530-437X

Type

jour

DOI

10.1109/JSEN.2005.859217

Filename

1532269