Applied Mechanics and Materials Vols. 568-570

Abstract: With high speed CMOS image sensor CMV4000 produced by CMOSIS company as the object, after the thorough analysis of the piecewise linear response principle and how to extend the dynamic range, using piecewise linear response extends the dynamic range of CMV4000 image sensor. The ideas and methods of using the finite state machine designs piecewise linear response sequence are given, and the function simulation is done for the sequence in the Quartus II 9.0 environment using the Verilog HDL hardware description language. Through the analysis of simulation results, it can satisfy the demands of piecewise linear response sequence. The method is simple and feasible, and can improve the optical dynamic range of CMV4000 image sensor.

Abstract: How to use the least nodes to complete the monitoring task is an important problem about deploying in wireless sensor networks (WSN). We present MBT algorithm, base on Monte Carlo method combines the edge betweenness and signal transition distance, in order to study sensor node deployment problem. The proposed algorithm of sensor node deployment can meet the demand or the monitoring accuracy requirement of the premise, and reduce the number of nodes. Simulation experiments show that MBT algorithm can reduce the required nodes of deploying.

Abstract: Light propagation in the medium is light-matter interaction process. For such a dynamic process, the process can be viewed as consisting of two sub-components: radiative processes and media response process medium light. This paper describes a two-dimensional nonlinear optical microcavities coupling of changing circumstances, to study the two-dimensional photon - photon mixed gas condensation, quantum phase transition, the post also pointed out that the mixed gas of quantum phase transitions and non-traditional linear optics and frequency generation relationship.

Abstract: Recently, using hollow-core photonic bandgap fiber (HC-PBF) for underwater acoustic sensing has been tested experimentally. Besides its unique characteristics and advantages over conventional single mode fiber (SMF), it provides higher responsivity to acoustic pressure. A robust deep water ray tracing model for multipath acoustic signals propagation and the elastic model of HC-PBF are both required to study the effects of underwater enviroment on the propagating acoustic signal for sensing with HC-PBF hydrophones. The combination of the two models allows studying the frequency response, sensitivity, detection range, and maximum operating depth of the HC-PBF hydrophones. The models analysis and simulations show the considerations that must be taken into account for the design and field operation of the HC-PBF hydrophones. In this paper, a complete package to study, design, optimize, and analyze the simulation results of the interferometric HC-PBF hydrophones is proposed.

Abstract: When Fiber-Optic Current Sensor(FOCS) measures the grid’s small current, FOCS’s output contains large noise due to the environment and components’ inherent noise, which results in lower accuracy. In order to improve the small current’s accuracy, a system of signal processing base on FIR real-time filtering was adopted. This text introduced the window functions’ features and filtering system aiming at the FOCS’s output was proposed. This system can adjust filter coefficient conveniently according to the output’s character. By the AC experiment under room temperature, the result proves that the SNR of FOCS’s output signal is improved by filtering and the current error ratio meets 0.2s class.

Abstract: Nodes in wireless sensor network have limited power supply and wireless channels between them are sensitive to interference. In order to make good use of the limited energy, a routing algorithm is proposed which uses the Ant Colony Optimization Algorithm to balance the load of the network and extend the network life, the proposed algorithm utilizes the dynamic adaptability and optimization capabilities of the ant colony to get the optimum route between the cluster heads．Simulation results show the feasibility and effectiveness of this algorithm．

Abstract: Two camera lenses for 3D low light level color night vision system are designed in CODE V. The panchromatic sensitive camera lens works in a wide spectral band 400nm-1000nm, yellow green-sensitive camera lens works in a band of 400nm-600nm.The two camera lenses have same parameters, such as focal length 120mm, relative aperture 1/2, the field angle of 5.26 °. In the design of two camera lenses, we split and complex cooke triplet lens, the chromatic aberration is balanced by adding a binary diffractive surface. The results of design show that sensitive panchromatic camera lens and yellow-green-sensitive camera lens, in the all field of view, when the Nyquist frequency is 77.5 (lp / mm), all MTF is larger than 0.6; the axial chromatic aberration of sensitive panchromatic camera lens is 0.056mm. Two camera lenses have good imaging performance.

Abstract: Redundancy technology is an important measure to enhance the reliability of computer control system. Two types of node redundancy architectures of wireless sensor network are analyzed. The design and implementing method of node redundancy in Zigbee network is presented. The node, which acts as master, is determined through competition after the system is powered up. The logical structure of the system is presented too. The switch protocol between master computer and backup computer and the method of competing for master among all the nodes are described in detail. The system can achieve that backup computer switches to master computer without disturbance. Because Zigbee network is adopted to achieve switching between Master and Backup, the reliability of the whole system is enhanced. The novel redundancy system is of low-cost, openness and good maintainability.

Abstract: In this paper, we propose a Density-based Energy-Efficient Unequal Clustering (DEEUC) algorithm to solve the energy consumption imbalance problem of the nodes deployed randomly. The algorithm balances the energy consumption of the cluster by making nodes as cluster head in turn and taking the remaining energy into consideration, which makes the generation of the cluster head more reasonable. It balances the energy consumption of the cluster by generating unequal cluster with different radius based on nodes density and the distance to the sink. In the routing strategy, the cluster head node with high density is chosen as the next hop, which makes the selected node undertake more data forwarding tasks, and balances the regional energy consumption. The simulation experiments show that this algorithm can effectively balance the network energy consumption and prolong the network lifetime.

Abstract: In this article we present a method to recognize artificial marks in augmented reality system. The distribution of marks is obtained by iterative approximation of the inconsistency between the synthetic gray-scale image and authentic binary image. The result shows our method can accurately recognize the marks, and solve the problem of mark recognition with partial occlusion or poor image quality.