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129 条记录 (耗时 0.027 秒)

    Self-calibrating precision timing circuit and method for a laser range finder
    12.
    发明授权
    Self-calibrating precision timing circuit and method for a laser range finder 失效
    激光测距仪的自校准精密定时电路及方法

    公开(公告)号：US5703678A

    公开(公告)日：1997-12-30

    申请号：US717635

    申请日：1996-09-23

    申请人： Jeremy G. Dunne

    发明人： Jeremy G. Dunne

    IPC分类号： G01C3/08 ,  G01S7/483 ,  G01S7/497 ,  G01S17/10 ,  G04F10/10 ,  G01P3/36 ,  G01S13/08

    CPC分类号： G01S7/497 ,  G01C3/08 ,  G01S17/10 ,  G04F10/10 ,  G04F10/105 ,  G01S17/105 ,  G01S7/483

    摘要： A highly precise range measurement instrument is made possible through the use of a novel and efficient precision timing circuit which makes use of the instrument's internal central processing unit crystal oscillator. A multi-point calibration function includes the determination of a "zero" value and a "cal" value through the addition of a known calibrated pulse width thereby providing the origin and scale for determining distance with the constant linear discharge of capacitor.

    摘要翻译： 通过使用一种新颖高效的精密定时电路，可以实现高精度量程测量仪器，该电路利用了仪器的内部中央处理单元晶体振荡器。 多点校准功能包括通过添加已知的校准脉冲宽度来确定“零”值和“校准”值，从而提供用于确定电容器的恒定线性放电距离的原点和标尺。

    Apparatus and method for detecting leaks in packages
    13.
    发明授权
    Apparatus and method for detecting leaks in packages 失效
    检测包装泄漏的装置和方法

    公开(公告)号：US5307139A

    公开(公告)日：1994-04-26

    申请号：US820403

    申请日：1992-01-15

    申请人： John Tyson, II ,  John W. Newman

    发明人： John Tyson, II ,  John W. Newman

    IPC分类号： G01M3/36 ,  G01L1/24

    CPC分类号： G01M3/363

    摘要： 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, such as 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. Preferably, the chamber is pressurized with helium to increase the sensitivity of the test. The gradual return of the deformed wall 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. In another embodiment, a single pixel of a series of interferometric images is analyzed to determine the number of times the pixel changes from a maximum to a minimum and back to a maximum. The latter number is related to the number of wavelengths of deformation, and can be used to compute the leak rate of the package.

    摘要翻译： 本发明检测小的密封包装，特别是微芯片或其他电子电路封装中的泄漏。 本发明包括用于检测精细泄漏的过程，以及用于发现总泄漏的稍微不同的过程。 为了检测总泄漏，可以将包装放在室内，稍微改变室内的压力。 如果泄漏不是太大，包装上的一个墙壁（如盖子）最初变形，但由于泄漏而迅速返回到其原始位置。 如果泄漏很大，包装的墙壁根本就不会移动。 用诸如电子剪切装置的干涉仪来监测壁的位置。 墙壁的移动显示是否有大的泄漏。 在微细的泄漏测试中，包装被放置在室中并且压力基本上改变，从而导致包装的壁变形。 如果有一个微小的泄漏，变形的墙壁逐渐返回到其初始位置。 优选地，用氦气加压室以提高测试的灵敏度。 可以通过干涉仪来测量变形的壁的逐渐返回，并且可以使用壁返回其起始位置的速率来计算泄漏率。 在另一个实施例中，分析一系列干涉图像的单个像素以确定像素从最大值改变到最小值并返回到最大值的次数。 后一个数字与变形波长的数量有关，可用于计算包装的泄漏率。

    Apparatus and method for performing electronic shearography
    14.
    发明授权
    Apparatus and method for performing electronic shearography 失效
    用于执行电子剪切的装置和方法

    公开(公告)号：US5094528A

    公开(公告)日：1992-03-10

    申请号：US528474

    申请日：1990-05-25

    申请人： John Tyson, II ,  John W. Newman

    发明人： John Tyson, II ,  John W. Newman

    IPC分类号： G01B11/16 ,  G01L1/24

    CPC分类号： G01B11/162 ,  G01L1/24

    摘要： Two laterally-displaced images of a test object interfere with each other to form a shearogram. Two shearograms, taken while the object is unstressed and stressed, respectively, are compared electronically to yield a composite interference pattern. According to the invention, each shearogram is formed by the interference of pairs of distinct rays of coherent light, reflected from different points on the object. The first ray of each pair is reflected from the object, strikes a mirror spaced from the object, and is reflected from the mirror. At the same time, the second ray of each pair is reflected from the object and strikes a beam splitter positioned beside the mirror. The beam splitter directs a portion of the second ray in the same direction as the reflected first ray, and a portion of the first ray passes through the beam splitter without being reflected. Since the two rays have the same polarization angle, and are mutually parallel, the rays interfere. A detector is positioned to receive light from the beam splitter. The detector observes the interference between pairs of rays over the entire field of view, and the result is an interference pattern, i.e. a shearogram, formed from the optical interference of the two laterally-displaced images of the object. The amount of shearing can be controlled by varying the angle of the mirror. Subsequent computer processing can be used to compare the shearograms electronically. Such processing can include the averaging of several shearograms, taken sequentially, with different phase shifts induced by linearly moving the mirror.

    摘要翻译： 测试对象的两个横向移位的图像彼此干涉以形成剪切图。 分别在物体不受应力和应力的情况下拍摄的两个剪切片进行电子比较，以产生复合干涉图案。 根据本发明，每个剪切图由对物体上不同点反射的相干光对的干扰形成。 每一对的第一根光线从物体反射出来，撞击与物体间隔的镜子，并从镜子反射。 同时，每对的第二根光线从物体反射并撞击位于镜子旁边的分束器。 分束器以与被反射的第一光线相同的方向引导第二光线的一部分，并且第一光线的一部分穿过分束器而不被反射。 由于两束光线具有相同的偏振角，并且相互平行，所以射线干涉。 定位探测器以接收来自分束器的光。 检测器观察整个视场上的光线对之间的干扰，结果是由对象的两个横向移位的图像的光学干涉形成的干涉图案，即剪切图。 可以通过改变反射镜的角度来控制剪切量。 随后的计算机处理可用于电子比较剪切图。 这样的处理可以包括按照顺序地采用几个剪切图的平均，具有通过线性移动反射镜而引起的不同相移。

    Hologram apparatus for detecting flaws with developing chamber
    15.
    发明授权
    Hologram apparatus for detecting flaws with developing chamber 失效
    用于用显影室检测瑕疵的全息仪

    公开(公告)号：US4506945A

    公开(公告)日：1985-03-26

    申请号：US598183

    申请日：1984-05-14

    申请人： John W. Newman

    发明人： John W. Newman

    IPC分类号： G01B9/021 ,  G03H1/04

    CPC分类号： G01B9/021

    摘要： 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.

    摘要翻译： 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。 本发明还包括没有激光器的摄影站本身。