Auto-gain method for stabilizing sinusoidal signals of optical encoders
Bibliographic entry
Auto-gain method for stabilizing sinusoidal signals of optical encoders = / C. Di [и др.] // Приборостроение-2025 : материалы 18-й Международной научно-технической конференции, 13–15 ноября 2025 года Минск, Республика Беларусь / редкол.: А. И. Свистун (пред.), О. К. Гусев, Р. И. Воробей [и др.]. – Минск : БНТУ, 2025. – С. 5-6.
Abstract
Optical encoders are widely used in precision positioning, yet signal amplitude attenuation due to grating tilt degrades phase resolution and linearity. In this manuscript, we analysed the amplitude-related resolution and proposed an auto-gain method based on programmed gain control and the CORDIC algorithm to stabilize sinusoidal signals. Experimental results demonstrate that the method amplifies signal amplitudes by approximately 11 times and reduces displacement nonlinearity by 69 %, significantly enhancing measurement resolution and stability. The approach is implemented on an FPGA-based phasemeter platform using programmable gain amplifiers and digital potentiometers, offering effective signal conditioning for optical encoders under varying operational conditions.
Abstract in another language
The effect of pulsed and continuous (sinusoidal) ultrasound (US) on the electrostatic potential of calcium phosphate (CaP) coatings formed during microarc oxidation (MAO) has been studied. Porous CaP coatings with a rough surface and an electronegative surface charge are formed in an electrolyte suspension based on hydroxyapatite during the MAO process. Using US during MAO increases the heterogeneity of the coating surface and decreases porosity, resulting in an increase in the negative electrostatic potential from −85 to −131 mV.