A high-performance optical system to reduce measuring errors and uncertainty in angular encoders is presented. We propose a novel reading optical head, which exploits a lens system to improve the speed of the beam crossing the photodelector and a quadrant photodiode to perform a zero-crossover acquisition of the timing information.
Design of a high-performance optical system for angular position measurement: optical and electronic strategies for uncertainty reduction / Rovati, Luigi; M., Bonaiuti; Pavan, Paolo. - In: IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT. - ISSN 0018-9456. - STAMPA. - 54:5(2005), pp. 2075-2081. [10.1109/TIM.2005.854256]