Advanced Materials Research Vols. 317-319

Abstract: Linear displacement sensor is a component, which can convert the displacement into electrical signals, and is used to measure the relative motion between components. Because the relationship between output of sensor and stroke power is nonlinear and it may be affected by external factors, the circuit should be compensated and the sensor should be calibrated. In this research, the LED formed light knife in the mechanical slit, lighting on the sensitive CCD array, and the relationship between displacement and CCD photosensitive arrays can be founded. CCD is the discrete components, which has avoided the nonlinear problem. At the same time, because the CCD output is digital, it reduced the measurement time, so that linearity, accuracy, stability, greatly are improved greatly.

Abstract: In this paper, the piezoelectric ceramic electronic voltage transducer principles is researched, a new internal structure of the measurement system is put forward and the signal processing methods are discussed. On the basis of the analysis of freedom cantilever optical measurement methods for the longitudinal piezoelectric deformation, we proposes the piezoelectric resonance method to detect amplitude of piezoelectric ceramic and cleverly designed mechanical structure, in which the lightweight elastic material is used to support the resonance thin film. This structure overcomes the impact of cantilever longitudinal self-gravity and horizontal friction between cantilever and piezoelectric ceramic, and can improve the deformation measurement accuracy. 10kV 0.05 class transducer voltage measurement accuracy is achieved theoretically.

Abstract: Distributed Algorithm (DA) has been applied widely because it doesn’t need multiply operation. The serial structure DA takes less chip resource but more calculation time, while the full pipeline parallel structure DA is just the reverse. A Serial-Parallel combined DA is proposed in this paper to take full advantages of the above structures to realize sampled data filter from sensor signal. Through the verification by simulation and synthesization, it is shown that the proposed improved serial-parallel DA can realize real time high speed sampled data filter from sensor, and it can reach the best tradeoff of time and chip area.

Abstract: Research on underwater sensor networks (UWSN) is one of the hot research topics at present. For characteristics of UWSN, such as the severe environment, the huge propagation delay, and the limited link capacity, it suffers more security threats than conventional networks. In this paper, weakness and desired properties of UWSN are discussed, and several key aspects of the security and energy issue of UWSN are investigated.

Abstract: A kind of strain measurement system of electromagnetic railguns based on Bragg Grating technology was introduced in this paper. The Bragg grating strain measurement system of electromagnetic railguns was designed. The data processing and the calibration of the measurement system were discussed. The experiments of strain measurement in electromagnetic launch were accomplished. The results show that the Bragg grating strain measurement system can work reliably in strong electromagnetic interference, which satisfied the special demand of anti- electromagnetic interference for the strain measurement system.

Abstract: This document deals with the study of a carbon dioxide detector, which is used in survivors searching in earthquake ruins. In order to find the carbon dioxide of exhaled gases of earthquake survivors in the narrow space, we compared the different types of carbon dioxide sensors. At last, we selected the infrared sensors, which direct access to digital signals through the microcontroller, and has a temperature compensation function. The result of measuring was displayed in a vacuum fluorescent displayer. When it achieves the preset value, the sound and light alarm will be triggered. The test results show that the detector is fit for narrow space survivors search.

Abstract: in order to measure knife blade angle, which has a serious influence on the sharpness and sharpness retentivity of knives and scissors, a knife blade angle measuring system based on electronics and laser technology is established. This system has many advantages such as a high precision (±1°), convenient and simple operation, cost saving, non-contact, safety and stability, etc. The system is very helpful to improve the product qualities of knives and scissors.

Abstract: This paper introduce a new dielectric film coating capacitor, which was used to measure the thickness of the water film in the efficiency of heat-exchange facility. It can overcome the disadvantages that caused by the humidity in the common capacitor. Firstly, the theoretical model of the special capacitive sensor was established. Then based on the theoretical model, we carried on experimental verification. In the premise of ensuring sensitivity, the resolution of the capacitive sensor is up to 10nm, and a high accuracy and on-line detection stability of the thickness measurement for water film were also achieved.

Abstract: At the view of the present situation of the oil-water interface measurement, all sorts of measurement method can not eliminate the interference of temperature and hang oil. In order to control water ratio of purification oil at the output, simple interface detector cannot have satisfy the actual needs. A key contribution of this paper is to propose a solution based on a new type of sensor head and a test of new solution to the problem of capacitive sensing at high water ratio. A LC oscillation circuits is used to detect the variation of capacitance, overcoming the influence of the hang oil and the temperature.

Abstract: Energy bills are on the rise and with the recent attention to saving the global environment. Saving energy (minimizing energy consumption) is becoming a standard issue for all industrial and commercial applications. Moreover, provisioning of quality of service (QoS) for multimedia traffic in wireless networks is complicated due to user mobility and limited wireless resources. Bandwidth (throughput) and hop count and are the important parameters in QoS requirements. In this article, a novel QoS constrained minimum power cellular ad hoc augmented network (QCMP CAHAN) architecture is proposed for next generation wireless networks. The QCMP CAHAN architecture is proposed to find the optimal minimum power route under bandwidth and hop-count constraints (QoS constraints). The QCMP CAHAN has a hybrid architecture, in which each mobile terminal (MT) of CDMA cellular networks has ad hoc communication capability. The QCMP CAHAN is an evolutionary approach to traditional cellular networks. We show that the total energy consumed by the MTs is lower in the case of QCMP CAHAN than in the case of traditional cellular networks. As the ad hoc communication range of each MT increases, the total transmitted energy in QCMP CAHAN decreases. However, due to the increased number of hops involved in information delivery between source and destination, the end-to-end delay increases. The maximum end-to-end hop count will be limited to a specified tolerable value, and QCMP CAHAN has ability to adapt to various hop-count constraints for different services. A MT in QCMP CAHAN will not relay any message when its ad hoc communication range is zero, and if this is the case for all MTs, then QCMP CAHAN reduces to the traditional cellular networks. Moreover, the bandwidth constrained problem in QCMP CAHAN is described as a nonlinear programming problem to minimize the total power consumption. We solved the bandwidth constrained problem in QCMP CAHAN by allocating optimum traffic rates on different routes between source and destination.