Applied Mechanics and Materials Vols. 303-306

Abstract: Industry temperature measurement plays an important role in both light industries and heavy industries. This paper presents our design of an industry temperature measurement node based on a thermocouple sensor and Zigbee. The cold-junction compensation circuit and signal gain circuit were implemented in the sensor modulation board. A firmware was developed on CC2530 to control the sensor reading and packets sending. A heating and cooling experiment was carried out. The results show that our design can successfully measure the temperature in industry applications and transfer it wirelessly via Zigbee communication.

Abstract: Based on the virtual instrument technology, a structural health monitoring (SHM) system was developed for angle measurement with a platform of graphical programming language (the LabVIEW software) and embedded acquisition system (CompactRIO). This system can realize the real-time synchronous monitoring for the structure’s inclination, and the LabVIEW software was used to compile the program of epistatic machine, which can achieve the system program’s visualization interface aesthetics, and redevelop the program function expansion. Through the experimental verification, the developed system is verified to be practicable and reliable, and the experimental results show that the operating system based on the virtual instrument technology to monitor angles of the structure is stabile and simply operated as well as reconfigurable, which has a good application prospect.

Abstract: This paper puts forward the railway tunnel construction based on GIS for deformation monitoring data analysis as the foundation of railway tunnel construction safety monitoring and risk early warning system. Practice shows that the system in engineering information acquisition, construction deformation data analysis, early warning and monitoring data has obvious advantages. And it is still in help users to make decisions and plays an important role to ensure the safety of tunnel construction.

Abstract: This paper presents a novel approach for railway tunnel deformation data analysis in Safety Monitoring Information System. The proposed work introduces a nonlinear machine learning method, Kernel Principal Component Analysis (KPCA), and K nearest neighbor classification (KNN) classifier for railway tunnel deformation data analysis. Kernel Principal Component Analysis (KPCA) is first applied to 1-dimension signals derived from a sequence of silhouette images to reduce its dimensionality. Then, we performed K nearest neighbor classification (KNN) for railway tunnel deformation data analysis. The experimental results show the KNN based railway tunnel deformation data analysis algorithm is better than that based on KPCA.

Abstract: The effective conductivity constant of crude oil different moisture content is different, the paper presents a weak signal of µV level detection method in crude oil moisture detection outside pipeline with electromagnetic conductance method. The paper describes the measurement principles, system structure, working process and theoretical analysis exactly. Electromagnetic conductivity measurement method has important practical value for mastering the crude oil amount in wells and subsequent processing of crude oil. Utilizing the detection circuit for crude oil moisture measurement has advantages of high measurement accuracy, high measurement speed, intuitive display and easy operation, which has good measurement results.

Abstract: Ranged-resolved profiles of atmospheric turbulence are necessary and important for many applications in astronomical and adaptive optics communities. In order to characterize the vertical atmospheric structure in field, a technique is put forward to remote sensing ranged-resolved profiles of atmospheric turbulence by combined with laser guide stars and differential image motion method. Laser guide stars are formed at several successive altitudes by projecting pulsed laser, returned signals of images are received by a optical system with two receiving telescopes, and variance of centroids distance is derived from the images with two spots at the same altitude. So, based on a inversion algorithm, atmospheric turbulence profiles are retrieved from differential image motion variance of distance of centroids at various altitudes. The structure constants of refractive index of atmosphere range from 10-14m-2/3 at lower altitudes to 10-16m-2/3 at higher altitudes are remote sensed experimentally. The results show it is a effective method that combined laser guide stars with differential image motion method and could sense atmospheric turbulence profiles remotely in real time.

Abstract: The capacitive probe for inner hole diameter measuring was introduced, the equipotential guard ring technique was adopted to eliminate edge effect of capacitive probe effective measuring electrode, the driving cables technique was used to reduce the influence of parasitic capacitance, and then we realize the precision measurement in any section of inner holes for diameter from Φ1.85 mm to Φ7 mm.

Abstract: A review of conventional and optical measurement methods of ultra high pressure vessels (UHPVs) in-service was introduced. Typical engineering applications of these technologies were illustrated. The new trends of inspection methods of UHPVs were discussed. Owe to full-field, non-destructive imaging characteristics with high precision and sensitivity, optical measurement methods had gained more and more attention in recent years. Therefore, DIC was suggested to be developed for experimental inspection of UHPVs in 2D or 3D surface shape and deformations.

Abstract: With the release of the standard, digital television terrestrial broadcasting is being gradually extended in many places. In order to speed up the extension and the application, also to evaluate the existing digital television terrestrial broadcasting system, we need a easy-to-use signal analysis and measurement system. The traditional signal measurement method is through the special hardware circuit to realize, but that method is high cost, and the system structure is complex and single function. To improve the flexibility of the system , we realize the system based on virtual instrument technology. In hardware section, this thesis described the block diagram of the system and the introduction of the NI vector signal analyzer. In software part, this thesis described the overall test system based on LabVIEW and the realization of the system features multi-threading, each step of synchronization signals achieved. The image Fig. 3 and Fig. 4 show the result of this system test software system.

Abstract: Power spectrum analysis can make EEG which the amplitude changes with time transformation for spectrum chart which the EEG power changes with time. From the spectrum chart the distribution of the α-wave, the θ-wave, the δ-wave and the β-wave, and the change of rhythm can be observed directly. On this study, the 1/f wave had been applied on the treatment of patients with mental disease , the analysis and the research of EEG before and after the 1/f wave electrical stimulation. The results show that, the 1/f wave electric stimulation has a significant effect for mental disease patients which were caused by structural damage.