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410 条记录 (耗时 0.013 秒)

    Method and apparatus for measuring penetration automatically
    131.
    发明授权
    Method and apparatus for measuring penetration automatically 失效
    自动测量渗透的方法和装置

    公开(公告)号：US3597965A

    公开(公告)日：1971-08-10

    申请号：US3597965D

    申请日：1969-10-02

    申请人： IDEMITSU KOSAN CO

    发明人： KAWAMURA TOSHIHIKO

    IPC分类号： G01N3/58 ,  G01N11/10 ,  G01N3/48 ,  G01N25/02 ,  G08B21/00

    CPC分类号： G01N11/10

    摘要： Method and apparatus for measuring penetration of pasty materials, such as petroleum asphalt. The apparatus consists of a measuring needle and standard weight associated with a penetration gauge. The needle and weight are fixedly attached to the stem of the penetration gauge then the combination is movable in the vertical direction by an elastic yarn. The entire operation is controlled by a timer so as to eliminate human errors in the measurement process. First the needle, weight and stem are raised by vertical motion of the yarn to a predetermined point. The position of the needle, weight and stem cause the penetration guage pointer to indicate slightly greater than a zero reading. This position is sensed by photoelectric means which stops the upward motion of the yarn, needle, weight and stem. At the same time a worktable carrying the sample to be measured contact the needle a shock is transmitted through the needle to the stem causing the pointer of the penetration guage to move to the zero reading position and at the same time expose one of the photoelectric cells. This stops the upward motion of the worktable and through the action of a timer releases the needle, weight and stem for the penetration measurement. At the end of the predetermined measurement phase the penetration can be read off the penetration gauge dial.

    Density measuring instrument
    132.
    发明授权
    Density measuring instrument 失效
    密度测量仪器

    公开(公告)号：US3581556A

    公开(公告)日：1971-06-01

    申请号：US3581556D

    申请日：1969-02-26

    申请人： TRW INC

    发明人： SALVINSKI RICHARD J ,  FIET OWEN O

    IPC分类号： G01N9/20 ,  G01N11/10 ,  G01P15/02

    CPC分类号： G01N9/20

    摘要： A high precision instrument or gauge is provided for measuring the density of a gas. The gauge includes a buoyant sensing member and forms an active portion of an electric feedback circuit. The circuit includes an AC (alternating current) bridge the output voltage of which is representative of a deviation of the sensing member from a null position. The bridge output voltage is used to control a restoring force current or electric field used to restore the sensing member to its null position. The feedback voltage or current is a measure of the buoyant force or density of the gas. The gauge, in one of its preferred embodiments, includes a hollow, magnetic, current conducting sphere which is buoyant when placed in a gas or gaseous mixture whose density is to be measured. The sensing member is magnetically suspended within the field of a differential electromagnet. The position of the sensing member within the magnetic field may be adjusted by changing the current to the electromagnet coils. Similarly, if the disturbance causes the sensing member to move from a null position, an appropriate change in the coil current will restore the sensing member to the null position. The coil current is controlled by the servosystem feedback voltage.