Applied Mechanics and Materials Vols. 462-463

Abstract: The profilometry of three dimensional objectives based on phase approaching of projected grating is widely used in various fields of application engineering. In this paper, two cameras are equipped in our system to obtain fast and static measurement compared to the conventional measuring system with single camera which needs rotated measurement. Algorithm of phase unwrapping based on reliability is also adopted to improve the performance which avoid the breakage of projected grating. Experimental data indicates the measurement error of this Two-camera phase measuring profilimetry system is within 1%. This new profilometry system has great potential application value in the profile measurement of static three dimensional targets.

Abstract: The purpose of this paper is to put up a device for urinary sediment detection with a homemade microscope and a CCD, and to test the feasibility of the device. In this study, we use a capillary to absorb the urinalysis control (UC) which is diluted 500 times, and drip it into a counting pool of a urinary sediment quantitative analysis board (USQAB). In this setup device, we detect 30 counting pools in this analysis board with microscopic examination in total. Further, we count the number of red blood cells (RBC) and white blood cells (WBC) of every counting pool, and calculate the average number of RBC and WBC of 30 counting pools. Though this detection device, we are able to get 30 groups of imaging results clearly while the number of RBC and WBC in each counting pool fluctuates around the mean value. The result indicates that the setup detection device in this experiment is simple and feasible.

Abstract: It is presented in this paper the technology of principal component analysis and analyze existing empirical equation and its calculation errors. A principle component model is then built up using the measurement data of sediments from the continental slope and shelf in southern South China Sea. It is also studied in theory how to exclude correlated parameters from a number of parameters that can affect the sound velocity and how to optimize a few parameters that are obviously related to sound velocity without cross-correlation. Using the optimal physical parameters, such as porosity n, median grain size Md (φ) and plastic limit Wp, a three-parameter forecasting equation of sound velocity is established for the continental shelf and slope in southern South China Sea.

Abstract: In this paper we build up a set of simple urinary sediment detection device which is composed of a biological microscope, focusing mechanism, and CCD camera. We apply this device in urinary sediment detection to verify its feasibility. In our experiment, the urinary sediment quality control diluted 200 times is dropped into quantitative analysis plate to detect on the device. We watch and count the number of red and white blood cells in 30 counting pools. Microscopic images are clear and the number of red and white blood cells in these images fluctuates around the average value. Experimental results show that our device is feasible in urinary sediment detection.

Abstract: This paper introduces the structure of the laser devices for tobacco impurity, the principle of separation and sorting performance. It mainly consists of a scanning device, a remote control system, finger grooves vibration slots, debris output vibration slots, a closed-loop cooling device, air clean unit and other components. The principle of separation is based on that 12 lasers scan material in 2000 times/second and then the impurity is changed its trajectory by compressed air blowing and falls to the reject slot, the remaining materials along the normal track go into acceptance slot. The sorting performance of laser removing impurities reaches ≥ 99.5%.

Abstract: At present, reliable micro-force sensing is one of the most important research for micromanipulation and micro-assembly. Six kinds of methods to detect micro-force are described in this paper. Analysis of the basic principle and detection accuracy of each sensing method, and applications in micro-assembly and micromanipulation are briefly introduced. The purpose of this paper is to be useful to provide some references for scholars engaging in the micro-force sensing, which in turn promotes automatic processing level of micro-assembly and micromanipulation to reliably manufacture micro devices of high quality.

Abstract: Snow and ice disasters on power system safe and reliable operation of the transmission line has a great threaten.An overhead conductor tension sensor based on fiber Bragg grating is developed.The sensor contains a strain sensor module and a temperature compensation module which can offer temperature compensation for strain sensing module.The sensor connected to the tower and the insulator with metallic clamps.If there is ice on the transmission line,the tension of the sensor sensing module of the center wavelength will corresponding change,and the ice condition of the transmission wires can be reflected by the center wavelength variation.Experiment indicates that the tension sensitivity coefficient of the sensor is 9.8 pm/kN,the repeatability error is 1.78% FS,the nonlinear error is2.4% FS, the hysteresis is 1.5% FS.

Abstract: Aiming at the problems currently exist in the wire communication used in the monitoring of SF6 moisture content parameters, such as complex wiring structure, fixed data collection points and easy occurrence of monitoring blind spots, ZigBee wireless communication technology is adopted according to the characteristics of soft sensing of SF6 moisture content, which applies to the implementation of design scheme of lower computer system for the SF6 moisture content multi-data collection wireless sensor network. At first, collection of relevant data information such as absolute humidity, temperature and pressure of SF6 gas is achieved utilizing a variety of wireless sensors; then flexible increase of sensors is achieved using ZigBee communication protocol and hardware modules. Simulation data show that: the maximum wireless transmission distance of the present design is 110 meters, and the minimum transmission distance 60 meters on condition of presence of obstacles, furthermore, the transmission bit error rate is low; the design also has small monitoring error for SF6 gas parameters, and a good reliability.

Abstract: As for different systems, there are much more intelligent algorithms for the sensors fault diagnosis. Some improvements and alternatives can be applied to several aspects of research. Many sensors fault modality are non-linear or general higher dimensional shapes to the diagnosis problem thus allowing to model arbitrarily complex failure phenomena. In the paper, the transducer fault diagnosis module introduces the information fusion basing on RBF neural network and the redundancy calculation, it shows that the failure of the fire alarm sensors can be detected and rehabilitated.