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In this paper, we report a novel single-mode laser with high immunity to external optical feedback following the principle of active-filter-tuned oscillator. Within the conventional Fabry-Pérot (FP) cavity, a high-Q bandpass filter formed by two tilted gratings with detuned Bragg wavelengths is embedded, and the resultant mode selection mechanism can purify the lasing spectrum by eliminating all but...
This paper presents an adaptive control system of central pattern generators (CPG) made of a network of mutually coupled Van Del Pol nonlinear oscillators. The CPG based controller is used to generate stable rhythmical locomotion trajectories. With the sensorial information feedback, a novel adaptive control strategy is implemented to help a quadruped robot with only two rotary Degrees Of Freedom...
In traditional strategy based on Center Pattern Generator (CPG), stance phases and swing phases are always fixed and their durations equal to each other approximately. Few CPG models care about the control of the knee joints under quadrupeds. In view of these deficiencies, this paper presents a model which is used to generate trajectories both for hips and for knees. The model has two desirable properties...
This paper proposed a fuzzy control system based on oscillator networks for the locomotion control of the quadruped robot whose legs have no yaw freedom. The oscillator networks are used to generate stable, synchronized leg gait signal for the locomotion of the robot. The fuzzy controller is introduced to tune the parameters of the oscillator networks for generating adaptive leg motion curve for the...
The performance of two high precision frequency-stability measurement systems, analog beat method time-interval analyzer, has been compared with digital beat method systems developed at the National Time Service Center. In this paper, the digital beat method system is a measuring technique that uses a multi-channel beat note digital analyzer in place of the time interval counter. This technique uses...
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