Novel Absolute Rotary Position Sensor Based on Combination of Gray Scale Pattern Disc

Absolute rotary angular /position sensors play an important role in various applications and rapid development of new technologies requires further accurate measurement and control. In this paper, a novel, very simple, low-cost and high accurate absolute rotary angular/ position sensor is presented. The sensor operation is based on the combination of circular gradient gray scale and gray code pattern. A simple experiment is done in order to demonstrate proof of concept of proposed sensor. The experimental results show that the proposed absolute rotary angular/position sensor has excellent linear characteristics with accuracy below ±1° and resolution of 0.1° within the full measurement range from 0° to 360°. The proposed idea and experimental results can be helpful to design absolute rotary angular/position sensor to improve performance of it.

A Four-Channel Gray-Code Addressing TDM Clocked-Analog LDO for Thermo-Optic Tuning in Silicon Photonics

This paper presents a Gray-code addressing time division multiplexing (TDM) clocked-analog low-dropout regulator (CLDO) that shares one controller between four output channels with only one compensation capacitor. We apply the Gray-code addressing strategy to reduce the crosstalk. We also apply the split-output amplifier structure to share the compensation capacitor for further chip area reduction. In addition, we introduce a lightweight local-generated supply to increase the dynamic range. Implemented in 130 nm CMOS process, this design has a total chip area of 0.056 mm2 , which is 67.5% smaller than the conventional solution with four identical LDOs. Post layout simulation results show that the presented four-channel TDM CLDO can simultaneously track four 1 V_pp sinusoidal signals at different frequencies with negligible crosstalk. This TDM CLDO is a promising solution for supplying multiple thermo-optic phase shifters (TOPSs) in silicon photonics

A Four-Channel Gray-Code Addressing TDM Clocked-Analog LDO for Thermo-Optic Tuning in Silicon Photonics

This paper presents a Gray-code addressing time division multiplexing (TDM) clocked-analog low-dropout regulator (CLDO) that shares one controller between four output channels with only one compensation capacitor. We apply the Gray-code addressing strategy to reduce the crosstalk. We also apply the split-output amplifier structure to share the compensation capacitor for further chip area reduction. In addition, we introduce a lightweight local-generated supply to increase the dynamic range. Implemented in 130 nm CMOS process, this design has a total chip area of 0.056 mm2 , which is 67.5% smaller than the conventional solution with four identical LDOs. Post layout simulation results show that the presented four-channel TDM CLDO can simultaneously track four 1 V_pp sinusoidal signals at different frequencies with negligible crosstalk. This TDM CLDO is a promising solution for supplying multiple thermo-optic phase shifters (TOPSs) in silicon photonics

Development, research and optimization of weight measuring system

The main task of the research is to improve technical and economic indicators of weight measuring system and to increase the efficiency of its research on the basis of cost-optimal planning of experiments. A system with a measuring tray has been developed, and it is different from existing systems with a possibility to control inclination angle of a tray, moisture content and temperature of a bulk substance, what provides better accuracy of mass measurement. The researches of weight measuring system were performed using the following methods of cost-optimal experiment planning: taboo search, particle swarm method, exhaustive search, Gray code based method. It gave possibility to reduce cost of implementing the experiment. To perform the research of weight measuring system, a plan of a full-factor experiment was selected, which was optimized for the cost of its implementation by using a method based on the Gray code. In the result of research, mathematical models in coded and natural values of factors were obtained. They characterize the dependence of the measurement acceptable error on such indicators as the angle of the measuring tray, the humidity of the bulk material, the coefficient of friction of the bulk material in motion. Using a mathematical model, rational values of the design parameters of the weight measuring system were obtained, which provide high accuracy (measurement acceptable error does not exceed 0.20%): the angle of the weight measuring tray α = 41.9°; humidity of loose material W = 14%; the coefficient of friction of the bulk material in motion fd = 0.70. The developed weight measuring system can be widely used for dosing of bulk materials in various technological productions.