In the field of industrial measurement and control,test objects are complex,test parameters are various, and it requires high standard for test speed and test precision. The traditional single-parameter and handworked tests were not suited to the development of productive forces. What’s more, some industrial field is difficult to intervene.So,it’s necessary to carry out the automatic
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New theories and methods of test are proposed and new instruments are developed because of the rapid development of electronic technology and computer technology after1980s. Many aspects about new technology break the traditional concept of instrument, the function of the measuring instrument start to a qualitative change. Then as a result, virtual instruments come into
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Fringing electric field (FEF) sensors which belong to novel capacitive sensorare widely used in non-destructive measurement of product characteristics inindustrial process control, including moisture, porosity, viscosity and density, withthe advantages of single-side access, adjustable signal strength and tomographycapability.This thesis analyzed the lumped parameter equivalent circuit of FEF sensorand introduced the floating voltage measurement mode and
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Wigner-Ville distribution(WVD) is widely used in the filed of signal processingduing to all kinds of excellent mathematical characteristics. However, the cross-terms ofthe WVD often bring us lots of problems, because the WVD is not additive in thecalculation. Aiming at this problem, cross-terms erasing method based on dual EnsembleEmpirical Mode Decomposition(EEMD) is put forward in this
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Fiber has a rapid development in communications and sensing fields thanks to its superiority. The Fiber Bragg Grating (FBG) sensor has been more widely used in temperature, pressure and other parameter measurement. FBG sensor converts the external parameters’ variations into its center wavelength’s moving. By detecting the offset of the center wavelength, we can know
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Fiber grating is the most widely used optical passive component that has got the most rapid development over the past decade. Fiber Bragg Grating (FBG, Fiber Bragg Grating) sensor is currently one of the popular research fields which has a high sensitivity, anti-electromagnetism interference, high temperature resistance, corrosion resistance, good stress and temperature characteristic.Fiber Bragg
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With the severe lack of traditional energy, wind power as a kind of emerging renewable energy is getting more attention. Compared with other green energy, wind energy has advantages of less limitation of resources and good industry bases. With the impact of Mexico Gulf Oil Spill and Japan’s Nuclear Crisis, wind energy will get greater
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The moving vehicle detection and tracking system based on video is one of the important research contents of the intelligent transportation system. It has incorporated the research achievements in image processing, artificial intelligence, automatic control and other related areas, and been applied widely in the transport and management fields. Therefore, the researches on the key
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The appearance of virtual instruments brings the traditional measurement technology into a new stage. It breaks the traditional concept of measurement technology and the vigorous development of virtual instruments not only becomes the mainstream of modern testing industry but also adds new vitality for machining manufacturing industry. Based on LabVIEW, the paper explores virtual instruments
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Carrier mobility is one of the most important characteristic parameters of semiconductors from which the electron transport property of materials can be obtained. Therefore, the measures of the carrier mobility are very important for the research and production of the semiconductor materials.With the development of science and technology, a new kind of instrument called virtual
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