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Youping Chen - IEEE Xplore Author Profile

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An optical fiber sensor based on absorption spectroscopy has been developed for the determination of carbon monoxide (CO) in the harsh environment. Conventional gas sensor used to detect carbon monoxide concentration is often difficult to achieve high sensitivity, selectivity, and specificity in presence of a mixture of gases. This sensor uses DFB LD as light source, low cost near-infrared compone...Show More
In this paper, an accurate position tracking control scheme is proposed for a moving-coil-type linear DC motor driven fast tool servo unit for noncircular cutting application. A sliding mode tracking controller is designed to ensure the system has a fast tracking characteristic to the position command. Moreover a disturbance observer is used to estimate and compensate exogenous disturbance to impr...Show More
In this paper, a kind of adaptive control based on fuzzy hierarchical approach for the permanent magnet linear synchronous motor (PMLSM) is proposed. According to different hierarchy of error state, one of the traditional fuzzy controller and integrator is applied. The servo control system can switch from traditional fuzzy controller to integrator smoothly when the control system is close to stabl...Show More
In this paper, the authors present a system structure for FPGA-based SOPC (system on programmable chip) design which uses an embedded processor to do scheduling to the HDL modules as its hard tasks. This kind of structure is implemented on the NIOS-II system offered by ALTERA and uses muC/OS-II as a real-time kernel in the embedded soft processor. The structure of the system is introduced in detai...Show More
The mobile robot localization methodologies in common use at present have been introduced. A localization algorithm based on extended Kalman filter (EKF) has been proposed on the basis of environment feature extraction and map building, which can reduce the error in the calculation of the robot's position and orientation. The method is that the mobile robot analyses and fuses the messages in surro...Show More
To enlarge the measuring range of inductive displacement sensor, the proposed displacement measurement instrument consists of four elements: the first is a movable coil with short length supplied with DC voltage. The second is a fixed iron rod acting as a core, its shape is designed carefully and the cross-section is varying along the axis. The third is an iron cover. It works as the external path...Show More
Based on palladium's hydrogen sensibility and its reversibility of absorbing hydrogen, a transmission optical fiber hydrogen sensor is demonstrated. We deposited thin palladium film on the end of a multi-mode optical fiber, using LED as light source, and using a big-diameter-core optical fiber to collect transmission light. When modulated light emitted from the LED is injected to the thin palladiu...Show More