With the wide application of laser cutting technology, undoubtedly the quality and efficiency of laser cutting are the most important two factors. In laser cutting process, especially 3D laser cutting, the distance between the cutting head with work piece and the verticality of laser beam axis with processed surface impact efficiency and quality seriously. At
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Seismic signals are important for geological prospecting and people to understand earth’sstructure. But it is difficult to acquire accurately because of its low frequency and weak energy. Thetraditional systems have some disadvantages like big size, narrow band, high consumption andnarrow reliable dynamic operation range and so on while the system base on MEMS can achivethese
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With the advantages of small size, high sensitivity, good stability, little temperature drift,low power consumption and working well in the force balance model, etc., MEMS capacitiveinertial sensor has been widely used in military affairs, automotive industrial, biomedicine,consumer electronics, inertial navigation and other fields.First, the measurement and control principle and system dynamic model of the capacitiveinertial
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Cardiovascular and cerebrovascular diseases have been always one of the major diseases that can threaten human health and life safety, while the ECG is a reflection of cardiac activity status in the body surface, and it is an important way to diagnose diseases. It is the premise to classify and identify the heart disease correctly
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Corn moisture content is the main factor of effecting corn safe transportation and storage, and is also an indispensable measurement part when it is used to feed, food and industry. Corn is one of the main grain crops. Due to large particle size, it will produce large gap during measuring moisture content. Because air has
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Passive dynamic FTIR spectrometer can be used for the spectral analysis ofenvironmental radiation, IR remote sensing technology is also increasingly applied to thetarget compounds exploration and gas identifying in an open environment. The infrared signaldetection plays an important role in spectrometer. IR signal conditioning circuit has a directimpact on the detecting accuracy of spectrometer.For I-V
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A resonant micro-machined pressure sensor measures the applied pressure by detecting the change of resonant frequency of its mechanical resonator.The sensor is characterized by its very small size,high accuracy,excellent stability and convenient interfacing with digital electronics,showing broad application prospects.Exact measurement is the purpose of the micro-machined pressure sensor design and the performance of the sensor
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As an important inertial sensor, micro-machined accelerometer has broad applications prospect in many fields, such as automobile, industrial control, scientific measurement, consumer electronics, also in military. Area changeable capacitive micro-machined accelerometer which was researched in this thesis is very small. In general its capacity is only a few PF, and differential capacitance is smaller. Because
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RF excited CO2 laser is used in field of industrial laser processing extensively. Unless precise detecting and controlling of its parameters have been carried out, RF excited CO2 laser can’t operate stably for a long time. The thesis aims to design the signal detection system of the measurement and Man-machine Interface for the laser.The thesis
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With the advantages of high sensitivity, low temperature coefficient, low power consumption and low cost, etc., MEMS capacitive accelerometer have been widely used in automotive, industrial, consumer electronics, oil exploration, navigation and other fields, and it should have a very broad market prospects and research potential.First this paper comparatively analyses the influnces of different detection
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