Title :
A 3.2 kHz, 14-Bit Optical Absolute Rotary Encoder With a CMOS Profile Sensor
Author :
Sugiyama, Yukinobu ; Matsui, Yoshinori ; Toyoda, Haruyoshi ; Mukozaka, Naohisa ; Ihori, Atsushi ; Abe, Tetsuya ; Takabe, Minori ; Mizuno, Seiichiro
Author_Institution :
Hamamatsu Photonics K.K., Hamamatsu
Abstract :
We have developed a 3.2 kHz, 14-bit optical absolute rotary encoder system using a profile sensor and a slit disc. The profile sensor, which we have designed for this purpose, is a unique CMOS area image sensor aimed at high-speed position detection of X and Y axes. Y axis profile data from the profile sensor is used for recognition of an index code on the slit disc, and X axis profile data is used for position detection of the index code. This combination of two-axis information enables high resolution even with a small number of index codes (64 indexes) and a small amount of digital calculations. Experimental results show that this system can detect rotation with an angular resolution of 14 bits (0.022deg) and a maximum detection speed of 3.2 kHz.
Keywords :
CMOS image sensors; image coding; CMOS profile sensor; frequency 3.2 kHz; high-speed position detection; image sensor; index code; optical absolute rotary encoder; slit disc; Automotive engineering; CMOS image sensors; Goniometers; High speed optical techniques; Image edge detection; Image sensors; Motion detection; Optical sensors; Photodiodes; Sensor systems; Absolute rotary encoder; CMOS image sensor; optical encoder; position detection;
Journal_Title :
Sensors Journal, IEEE
DOI :
10.1109/JSEN.2008.920709
