Applied Mechanics and Materials Vols. 303-306

Abstract: A new implementation of frequency shifting for the delayed self-heterodyne interferometer (DSHI) is proposed in this paper. In order to avoid the costly and complicated acoustic-optic modulator to shift frequency in the DSHI, we propose that a phase modulator can be used instead. The alternative strategy simplifies the complexity of the DSHI setup, as well as reduces the modulation-induced noise by modulating the two arms of DSHI at the same time. Theoretical and experimental analysis show that such a strategy successfully fulfills the frequency shifting function for the DSHI and accurate measurement of a laser’s linewidth and lineshape is realized correspondingly.

Abstract: A method was proposed to measure shockwave speed from explosion based on critically curved fiber loops, and a device was developed to validate the feasibility of this method. The principle, configuration and validation experiment of the measurement were discussed in detail.50g explosive was ignited and the speed of nearly MPa level shockwave was measured successfully. It is proved that the method and device based on critically curved fiber loops are practical and effective for the shockwave speed measurement.

Abstract: The working principles of MOCT(Magneto–Optical Current Transformer) based on improved dual optical path detection method is studied. The MOCT’s output could be influenced by both the fluctuation of operating wavelength and the error of intersecting angle of optical axis between polarizer and analyzer . Based on IEC 60044-8 standard, the scope of the photosource wavelength and angle error of photic axis are obtained. The results would be useful for researchers and designers working in the MOCT area.

Abstract: In the implementation of the loss-compensated recirculating delayed self-heterodyne interferometry (LC-RDSHI) measurement of laser linewidth, we observe the fluctuations among the different orders of beat spectra, which are not expected according to theoretical analysis and may lead to the distortion of lineshape and inaccurate estimation of the laser linewidth. To explain the observation, we in this paper simplify the polarization model in the recirculating heterodyne ring interferometer containing a polarization controller (PC) and point out the effect of the polarization control in the LC-RDSHI measurement. The simulation result of our model explains well the observed fluctuations.

Abstract: Immobilization of egg lecithin liposomes on Octadecanethiol (ODT) modified gold electrodes has been studied. The changes of the resistance of the layer with deposited liposomes, occurred under stimulation by different concentration of phloretin were measured with electrochemical impedance spectroscopy (EIS) and were used for the calculation of association constants. The binding constants Kb was obtained to be (7.571±0.821)×105 L•mol-1, indicated that high affinity existed between phloretin and liposomes.

Abstract: In order to simulate the diagnosis by feeling the pulse with Traditional Chinese Medicine，the pulse image acquisition system was developed. A CMOS camera attached to a magnifying lens is used to solve the problem that industrial cameras can not carry out the image acquisition in microspur. The improved system could avoid the influence from environment light. The cantilever beam structure was adopted to obtain the pulse-taking pressure value directly and accurately. The thin film is made of the liquid membrane silica gel, which can overcome some shortages of the previous film. The typical pulse images were collected from the MM-3 pulse pattern generator by using the improved system. The results show that the improved system provides reliable conditions for analyzing the pulse information.

Abstract: Based on the analysis and the induction of electronic control fuel injection engine common failure which can't start, and according to the engine’s working principle and failure mechanism, established the electronic control fuel injection engine’s fault tree, and having made qualitative analysis about the working reliability of the engine by using the fault tree analysis method. This paper offered the electronic control fuel injection engine’s failure form which can’t start in classification, discussed the process of establishing the fault tree at length, even built and mapped the engine’s fault tree which can’t start; According to the natural gas compressor’s fault tree diagram, and applying the descending method to get the fault’s minimal cut sets. By making qualitative analysis, finding out the main influence factors of failure, and putting forward quite perfect methods of removing fault, which providing electronic fuel injection engine maintenance with the beneficial reference.

Abstract: The qualitative and quantitative identification of combustible gas mixture cannot be realized by a single sensor. Therefore, a semiconductor gas sensor array was built up. The experimental parameters including the dynamic and static information of the sensors were selected. The qualitative and quantitative identification of combustible gas mixture are achieved by the artificial neural network. The results show that this method for the qualitative identification of the combustible gas mixture is completely correct. The highest false rate of the quantitative analysis is 0.38% and the average false rate of the quantitative analysis is 0.079%. Achieve a good qualitative and quantitative identification.

Abstract: Oil spill accidents occur constantly with the rapid development of marine resources exploitation industry. Based on the offshore oil rigs hardware conditions of Sinopec, including radars and wireless network stations, this paper puts forward a architecture mode of oil spilled network monitoring system. This system can monitor the oil spill information of offshore oil rigs and provide bases for tracing sources, handling pollution and identifying responsibility of oil spilled accidents.

Abstract: The water content of fine iron powder is an important parameter to evaluate the fine iron powder price, and there is very important practical significance for rapidly measuring water content of the fine iron powder during manufacturing and trading. So water content detecting method is explored for fine iron powder based on capacitance sensor. The capacitance size depends on the dielectric constant of material between the plates, and the capacitance value reflects the iron powder water content. The water content measurement system for the fine iron powder is designed based on the principle above. The measurement probe components and its testing mechanics are researched, and capacitance measurement circuit and single chip control system of STC89C55 are designed. The software programming and debugging for single chip control system are completed. The experimental results show that the capacitive measurement method of water content for fine iron powder is feasible and easy to implement real-time or rapid monitoring.