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    • 12. 发明授权
    • Apparatus and method for detecting leaks in packages
    • 用于检测包装中的泄漏的装置和方法
    • US5082366A
    • 1992-01-21
    • US574809
    • 1990-08-30
    • John Tyson, IIJohn W. Newman
    • John Tyson, IIJohn W. Newman
    • G01M3/36
    • G01M3/363
    • This invention detects leaks in small, hermetically sealed packages, especially microchips or other packages of electronic circuits. The invention includes a procedure for detecting fine leaks, and a somewhat different procedure for finding gross leaks. To detect gross leaks, one places the package in a chamber, and varies the pressure in the chamber slightly. If the leak is not too big, one wall of the package, such as its lid, initially becomes deformed, but quickly returns to its original position, due to the leak. If the leak is very large, the wall of the package may not move at all. The position of the wall is monitored with an interferometer, preferably an electronic shearography apparatus. The movements of the wall show whether there is a gross leak. In the fine leak test, the package is placed in the chamber and the pressure is changed substantially, thus causing the walls of the package to deform. If there is a fine leak, a deformed wall gradually returns to its initial position. This gradual return can be measured by the interferometer, and the rate at which the wall returns to its starting position can be used to calculate the leak rate. The interferometer can be located inside the test chamber, or it can be located outside the chamber. At least one additional "control" package is preferably placed inside the chamber, alongside the test package, to verify the accuracy of the test results.
    • 13. 发明授权
    • Method of and apparatus for pipe length measurement
    • 管道长度测量方法和设备
    • US4584676A
    • 1986-04-22
    • US358290
    • 1982-03-15
    • John W. Newman
    • John W. Newman
    • G01B17/00G01S15/14
    • G01B17/00Y10S367/902Y10S367/91
    • An improved method and apparatus for measuring the length of an open pipe includes a sound transducer placed in spaced open air communication with the interior of the pipe at a selected end. A logic circuit is employed with the transducer for producing a square wave sound pulse that is directed at the pipe's selected end. An oscillator provides an ambient temperature modified count in accordance with the time required for the pulse to travel the length of the pipe and return. For compensating for error tending to be introduced because of the spacing of the impedance reflective surface at the far end of the pipe, a standoff device establishes such a distance between the transducer and the selected end of the pipe as to effect an adjustment in the duration of the oscillator count that corrects for the error. In another embodiment a microprocessor is employed with the transducer to produce two successive square wave sound pulses to effect an adjustment in the count of an oscillator clock to avoid a false reading due to the above-mentioned spacing of the reflective surface. The amplitude of the greatest peak of the first pulse is measured. The gain of an amplifier is then adjusted to make a timer stop, modified in accordance with ambient temperature, during the reception of the echo from the second pulse when 40% of the amplitude of the peak echo is obtained.
    • 用于测量开放管道的长度的改进的方法和装置包括在选定的端部处与管道内部间隔开的空气连通的声换能器。 传感器采用逻辑电路产生针对管道选定端的方波声脉冲。 振荡器根据脉冲行进管道长度和返回所需的时间提供环境温度修改计数。 为了补偿由于管道远端处的阻抗反射表面的间距而导致的误差,间隔装置在换能器和管道的选定端之间建立这样的距离,以实现持续时间的调节 的振荡器数量来纠正错误。 在另一个实施例中,微处理器与换能器一起使用以产生两个连续的方波声音脉冲,以实现振荡器时钟的计数的调整,以避免由于反射表面的上述间隔引起的误读。 测量第一脉冲的最大峰值的振幅。 然后调整放大器的增益,以便在获得峰值回波的40%的幅度时从第二脉冲接收回波期间根据环境温度修改定时器停止。
    • 14. 发明授权
    • Hologram apparatus for detecting flaws with developing chamber
    • 用于用显影室检测瑕疵的全息仪
    • US4462668A
    • 1984-07-31
    • US284634
    • 1981-07-20
    • John W. Newman
    • John W. Newman
    • G01B9/021G03D3/02G03D3/08
    • G01B9/021
    • Hologram apparatus for detecting flaws has a photographic station for supporting a photosensitive medium. The photographic station together with the photosensitive medium forms a developing chamber with a transparent face having a depth in the range of from about 0.005" to about 0.125, preferably from about 0.005" to about 0.125". The developing chamber has a periphery with a contour which always changes at an angle greater than about 115.degree. and is preferably circular. Associated hydraulic equipment supplies and removes fluid from the developing chamber. A laser supplies coherent light for the article to be tested for reflection to the photographic station. A reference beam is directed to the photographic station. For use in inspecting pipe in the field, the apparatus advantageously has a housing and a pair of saddles each having different diameter pipe receiving portions and a strap securing system. The photographic station can develop the photosensitive medium in situ and may be used in any spatial orientation. The invention also comprises the photographic station per se without the laser.
    • 用于检测缺陷的全息图装置具有用于支撑感光介质的照相台。 摄影台与感光介质一起形成具有深度在约0.005“至约0.125”,优选约0.005“至约0.125”范围内的透明面的显影室。 显影室具有轮廓的周边,其总是以大于约115度的角度改变,并且优选为圆形。 相关的液压设备供应并从显影室中去除流体。 激光为待测试的物品提供相干光以反射到摄影台。 参考光束被引导到摄影台。 为了在现场检查管道中使用,该装置有利地具有壳体和一对鞍座,每个鞍座具有不同直径的管接收部分和带固定系统。 照相站可以原位显影感光介质,并且可以以任何空间取向使用。 本发明还包括本身没有激光的摄影台。