The valve clearance is essential to the engine efficacy, this paper presents the definition of the valve clearance and selecting fundamental of the valve tappet, and the tappet selector was developed on these grounds,...
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The valve clearance is essential to the engine efficacy, this paper presents the definition of the valve clearance and selecting fundamental of the valve tappet, and the tappet selector was developed on these grounds, which was consisted of the cylinder head measurement machine and camshaft measurement machine;the errors of the tappet selector were analyzed in brief, and the repetition and veracity of the tappet selector were tested, the data shows that the measurement is accurate, the valve clearance could be controlled with the tappet selector.
The basic principle of Phase-Inversion Symmetric Method was studied, this method was applied to Spread Spectrum Communication system, and a system frame of Spread Spectrum Communication system based on Phase-Inversion...
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The distributed routing protocol is widely used in wireless sensor networks. But it is mainly designed for homogeneous networks and also has the disadvantages of irrationality of choosing cluster head and unbalanced e...
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Based on fractional Fourier transform, the double folding operation is studied and introduced into image encryption. This method can implement a kind of the encoding with real number. This characteristic is convenient...
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The test vector generation algorithm and the compression algorithm based on general structure model of SOC was introduced in this paper. We have analyzed the PODEM algorithm for test vectors generation and translated ...
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In order to resolve the wrapper optimization and TAM co-optimization issues, this paper presented a new technique based on neural network combined with genetic algorithm to achieve dynamic scheduling test *** result o...
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For improving accuracy of optical flow computation, we propose a new method to compute optical flow from both gray and color information. First, the Gauss filter is used to pre-filter the color image sequence. Then op...
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Free space optical communication technology approach has a number of advantages;unfortunately, it can be severely affected by atmospheric turbulence. Adaptive optics is the technology for correcting random optical wav...
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To solve the problem of online measuring large-scale equipments, the paper proposes a stereo vision coordinate measuring system based on optical bar with the function of measuring and calibration, which overcomes the ...
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Fiber laser gas sensors based on the intra-cavity absorption spectroscopy require the use of gas cells. We propose a simple and reliable gas cell using graded-index fiber lens (GFL) based all-fiber collimator. Convent...
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ISBN:
(纸本)9780819476630
Fiber laser gas sensors based on the intra-cavity absorption spectroscopy require the use of gas cells. We propose a simple and reliable gas cell using graded-index fiber lens (GFL) based all-fiber collimator. Conventional gas cells usually utilize direct fiber-to-fiber coupling without collimators or graded-index (GRIN) lens as collimators. Direct fiberto- fiber gas cell has simple configuration, but it suffers from high coupling loss and stray light interference. Gas cells applying fiber pigtailed GRIN lens are advantageous to achieve low coupling loss. However, fiber pigtailed GRIN lens requires accurate and complicated alignment and glue packaging which could compromise long term reliability and thermal stability. The proposed technique fabricates all-fiber collimators by simply splicing a short section of gradedindex fiber to single mode fiber which is both compact and durable. With that collimator, the gas cell can be fabricated very thin and are suitable for extreme environments with high temperature and vibration. In this paper, we have carried out experiment and analysis to evaluate the proposed technique. The coupling efficiency is studied versus different GFL gradient parameter profiles using ray matrix transformation of the complex beam parameter. Experiments are also done to prove the practical feasibility of the collimator. The analysis indicates that gas cell using GFLs can overcome the disadvantages of traditional design;it may replace the conventional gas cells in practical applications. 2009 SPIE.
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