A 120/spl times/110 position sensor with the capability of sensitive and selective light detection in wide dynamic range for robust active range finding

A 120/spl times/110 sensitive and light selective position sensor array with wide dynamic range is presented. The sensor can detect the position of a low-intensity light projected on nonuniform background illumination for a robust range finding system. It achieves -18-dB signal-to-background ratio (SBR) light detection in wide range of 48-dB background illumination due to a modulated light projection and correlation technique on the sensor plane. It also realizes selective light detection for multiple light projection systems. The range finder has been fabricated in 0.6-/spl mu/m CMOS process and successfully tested. The range finding system achieves <1.5-mm range accuracy at 1000 mm using a low-intensity projected laser beam in a nonuniform target scene.