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    • 24. 发明授权
    • Measurement of the variation of a material property with depth in a ferromagnetic material
    • 测量铁磁材料中材料特性随深度的变化
    • US06850055B2
    • 2005-02-01
    • US10245401
    • 2002-09-18
    • David John Buttle
    • David John Buttle
    • G01N3/00G01N3/02G01N3/06G01N3/32G01N19/08G01N27/72G01N27/90G01R33/12G01B7/24
    • G01R33/12G01N3/32G01N19/08G01N27/72G01N27/9053G01N2203/0019G01N2203/0073G01N2203/0244G01N2203/0635
    • The variation in properties of a ferromagnetic material with depth below the surface is assessed in a nondestructive fashion using a probe that incorporates an electromagnet. An alternating magnetic field is generated in the electromagnet and so in the object, and a magnetic sensor is arranged to sense a magnetic field due to the electromagnet. Signals from the magnetic sensor are analysed into an in-phase component and a quadrature component, and these are mapped directly into material property and lift-off components; this analysis enables accurate measurements of material property (such as stress) to be distinguished from changes in lift-off. The measurements are repeated for at least five different frequencies of the alternating magnetic field; and the measurements at different frequencies are deconvolved assuming a functional form for the variation of material property with depth, the function having no more than five unknown constants. The stress at depths for example in the range 0.5 mm to 5.0 mm can hence be measured nondestructively.
    • 使用包含电磁体的探头以非破坏性方式评估具有深度低于表面的铁磁材料的性质变化。 在电磁体中产生交变磁场,并且在物体中产生交变磁场,并且磁传感器布置成感测由于电磁体引起的磁场。 来自磁传感器的信号被分析成同相分量和正交分量,并将其直接映射到材料性质和剥离分量中; 该分析使得能够精确地测量材料性质(例如应力)以与剥离的变化区分开来。 在交变磁场的至少五个不同频率上重复测量; 并且对于不同频率的测量,假设具有随深度的材料特性变化的函数形式,该函数具有不超过五个未知常数。 因此,深度的应力例如在0.5mm至5.0mm的范围内可以非破坏性地测量。
    • 25. 发明申请
    • Process and apparatus for irradiating fluids
    • 用于照射流体的方法和装置
    • US20040081591A1
    • 2004-04-29
    • US10722494
    • 2003-11-28
    • AEA Technology plc.
    • John Patrick Perkins
    • B06B001/00
    • B01J19/10B01J2219/0877
    • Fluids in a vessel are subjected to a high ultrasonic intensity, by means of several ultrasonic transducers attached to a wall of the vessel, each transducer (14) radiating no more than 3 W/cm2, the transducers being sufficiently close to each other, and the number of transducers being sufficiently high, that the power dissipation within the vessel is at least 25 W/litre. The number of transducers, the power of the transducers, and the volume of the vessel may be such that the power density is between 40 and 80 W/litre. The vessel may be double walled, and the space between the two walls be filled by a low attenuation buffer liquid (36) whose cavitation threshold is above that of the liquid being treated.
    • 容器中的流体通过附接到容器壁的几个超声波换能器受到高超声波强度,每个换能器(14)辐射不超过3W / cm 2,换能器足够靠近每个 换能器的数量足够高,容器内的功率消耗至少为25W /升。 换能器的数量,换能器的功率和容器的体积可以是功率密度在40和80W /升之间。 容器可以是双壁的,并且两个壁之间的空间由其空化阈值高于被处理液体的低衰减缓冲液(36)填充。