As i found so far there are two types of incremental encoders for rotational position/speed calculation/detection application.
1)magnetic incremental encoder ICs eg:- SSI, SPI or I2C interface , 8bit to 16bit resolution up to 30000rpm, also these are programmable.
2)Absolute or incremental encoder mechanical type eg:- 10000rpm 2500ppr
which type is better ? in terms of performance, reliable, life time, error % at higher rpm (higher frequencies)?
I am going to use encoder to measure speed and crank angular position of an engine at 10000rpm using FPGA