Title :
Intensity Control of Triangulation Based PSD Sensor Independent of Object Color Variation
Author :
Jung, Jong Kyu ; Kang, Seong Gu ; Nam, Joon Sik ; Park, Kyi Hwan
Author_Institution :
Dept. of Inf. & Mechatron., Gwangju Inst. of Sci. & Technol. (GIST), Gwangju, South Korea
Abstract :
Intensity control of triangulation based position sensitive detector(PSD) sensor is addressed to achieve high linearity against object color variation. The controlled signal is added to the pulse amplitude modulation (PAM) signal of the PSD in order to have the beam intensity of photo diode be regulated constant. The control performance for object color variation is compared with the result when intensity control is not applied. Analytical and experimental results indicate that intensity control provides more accurate and higher linearity than that of PSD sensor without using the intensity control by using analysis and experiments.
Keywords :
displacement measurement; optical sensors; photodiodes; position measurement; pulse amplitude modulation; PAM signal; PSD sensor; object color variation; photodiode; position sensitive detector; pulse amplitude modulation; triangulation intensity control; Current measurement; Diode lasers; Electrodes; Laser beams; Measurement by laser beam; Position control; Pulse modulation; Surface emitting lasers; High linearity; intensity control; position sensitive detector; pulsed amplitude modulation;
Journal_Title :
Sensors Journal, IEEE
DOI :
10.1109/JSEN.2011.2157968
