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    Acoustic emission testing solutions

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    Acoustic emission testing solutions

    Power transformer fault are mostly caused by insulation failure, while the existing maintenance and insulation preventive test system has the following: 
    A. is different test conditions and operating conditions, off-line test can not fully reflect the insulation condition of the equipment under the condition of the running. 
    B. although insulation fault has development process, but there are different development speed, sudden failure in ehv transformer occupies a considerable proportion in the accident. 
    C. regular maintenance and preventive test must be a power outage offline, insulation test time is long, workload is big, also can cause equipment damage. So, in the operational conditions for online monitoring of transformer insulation condition. 
    Partial discharge characteristics is an important index to measure the quality of power transformer insulation system, more than 110 kv power transformer, each have to do in the factory test of partial discharge test. Transformer after the installation, commissioning test, the oil found in the running of air content exceeds bid, in general, to do partial discharge test. At home and abroad in recent years, has developed a variety of test system, used for transformer partial discharge online monitoring, most of them are based on the acoustic emission technology.

    Piezoelectric ceramic non-standard customized programs

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    Piezoelectric ceramic non-standard customized programs

    Knocking sensor is mainly used for vibration (knocking) caused by automobile engine’s abnormal combustion .The sensor converts this signal to electrical signals and transmits it to the microcomputer for engine control in order to meet the demands of automobile exhaust regulations, fuel improving and high output, etc. Provide material components of stable sensitivity characteristics even at high temperature. 
    Knocking sensor element is mainly using Japan Fuji ceramic pieces, which provide a guarantee to the trial function of the sensor, and Japan Fuji piezoelectric ceramic chip has 25 years of manufacturing excellence, which also ensures the proficiency of the piezoelectric ceramic in terms of its performance. The global market share of Fuji ceramic knocking sensor has reached 35%, which means that one in three cars is using Fuji piezoelectric ceramic chips.
    There are commonly two kinds of knocking sensors : piezoelectric sensors and porcelain telescopic sensors. Among them, piezoelectric resonant sensor is most widely used and generally installed in the engine block, making use of piezoelectric effect to change mechanical vibration from detonation into signal voltage. When the frequency from detonation (about 6000 Hz) is consistent with the natural frequency of the piezoelectric effect sensor itself, resonance phenomenon would produce. The sensor outputs a high detonation signal voltage to ECU and ECU would correct ignition time to avoid the generation of detonation. 
    Knocking sensor is a kind of AC signal generator but they are very different from most other car AC signal generator. In addition to detecting rotors’ speed and position like magneto electric crankshaft and camshaft position sensor, they also detect vibration or mechanical stress. Different from the stator and the magnetic resistance, they are usually piezoelectric device. They can sense special materials of mechanical pressure or vibration (such as engine can produce AC voltage from detonation shock) .  
    Knocking sensor is installed in different locations of bodies or cylinders. When vibration or knocking occurs, it generates a small peak voltage. The greater the knocking or vibration is, the greater main production peak of the knocking sensor is. A certain amount of frequency reflect knocking or cylinder and knocking sensor is usually designed to measure frequencies that range from 5 to 15 K Hz . When the control unit receives these frequencies, computer would reset ignition timing to prevent continuous knocking. So knocking sensor is usually very durable and the sensors would only be damaged by the failure from itself.

    Electromagnetic diagnostic solutions

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    Electromagnetic diagnostic solutions

    Sampling was carried out on the bearing fatigue life test, from the experiment data processing of actual life, is represented by the number of participants bearing bearing fatigue test of life. But in reality, such as the use of each specific occasions, all from a sufficient number of bearing life test, to verify whether bearing suits, the economically, time and labor is very big, so the bearing life test method only in the case of necessary or important use.
    Bearing failure form is various and the calculation of bearing life is very useful for mastering the bearing’s using dimensions and only in this way can find the best time of changing the bearing.
    IIU electromagnetic diagnostic test system combines vibration diagnosis and electromagnetic diagnosis together to quantitatively evaluate fatigue and damage, and can store data and predict using life. 
    Through the vibration level trend monitoring damage occurred and by FFT signal processing technique to specific injury, damage through autocorrelation method, the RMS method, quantitative evaluation and forecasting life, accumulated fatigue through electromagnetic diagnostic evaluation and this kind of quantitative evaluation method is the unique technology of IIU . 
    Quantitative evaluation method can visualize the damage degree of progress and we made a lot of speed up bearing aging experiment to store the data about damage degree of progress. Execute all kinds of load test, store the data about the relation of live load, so that we can evaluate real machine bearing life after the damage of environment. Finally , electromagnetic method for auxiliary diagnosis can improve the reliability and quantitative after diagnosis...

    PCI/PCIe bus extension scheme

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    PCI/PCIe bus extension scheme

    In medical applications and military applications of X-ray or B ultrasonic testing, it always needs multi- screen display system, easy for doctors or engineers to see local high-definition images. 
    Matrox company in Canada is one of the world's leading video processing equipment company, its matrox Xenia ™ series display controller card design (CR) used for computer X-ray photography, digital radiography (DR) imaging and image archiving and communication system (PACS) workstation, and supports a wide range of display format, resolution and Settings. Native PCIe x16 highest single groove plate can be equipped with 1 GB of on-board RAM, in order to realize the fast image loading function, significantly increased the speed of operation; Most every board to drive three high resolution digital display, can be installed, setup and deployment of image workstation the time required to reduce to a minimum. Every road and Xenia Xenia Pro digital display output supports the following functions, including support for 8, 10 and 13 independent gamma lookup table (LUT), can be accurate to gray-scale and color display DICOM calibration, so as to provide more accurate check and diagnosis of image display. Above, Xenia multiple screen display card in the application of medical ultrasound.
    Xenia multiple screen display card can be inserted into single PCI Express slot in the docking station of American MISSION group of MAGMA, thus formed the portable medical imaging screen display system. The system can be used in the development of medical imaging solutions, such as angiography, C arm, mobile X-ray, cardiology, breast photography, patient monitoring and ultrasound and other fields. 
    The system can be the result of medical examination in three screen at the same time, and may specify the content area of each screen, and has good portable performance. It can also be used to screen projection system. 
    The system has been officially tested for a long time by Wallace and Canada and United States MiSSON technology and its compatibility, stability and reliability have been obtained proof of identity.See data of series multi- screen display card   
    http://www.matrox.com/graphics/cs/products/dcb/medical_imaging/xenia/

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