Abstract: Based on a comparison of the advantages and disadvantages of commonly used photoelectric encoder-based speed and acceleration measurement methods, this paper proposes a new high-precision speed and acceleration measurement method based on photoelectric encoders, and discusses the hardware and software implementation methods. Furthermore, to address the impact of encoder pulse non-uniformity on the accuracy of speed and acceleration measurement, a software processing method is proposed, which significantly improves the accuracy.
Keywords: photoelectric encoder, speed measurement, acceleration measurement, pulse width error
1. Introduction
An optoelectronic pulse encoder is a digital angle sensor that converts angular displacement into corresponding electrical pulses for output. It is primarily used for the detection and control of mechanical angular position and rotational speed. In speed measurement systems based on optoelectronic encoders, three common methods are used: the "M method," the "T method," and the "M/T method." The acceleration value can theoretically be calculated using the speed difference and time interval between two adjacent speed points measured by these methods. This paper proposes a new method based on the analysis and comparison of various existing speed measurement methods using optoelectronic encoders, which offers higher speed measurement accuracy and real-time performance. Furthermore, manufacturing errors in ordinary encoders result in uneven pulse widths, significantly impacting the accuracy of speed and acceleration measurements. This paper proposes a software processing method to address this issue.
For details, please click: A High-Precision Speed and Acceleration Measurement Method Based on Photoelectric Encoder
