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    System for suppressing multiple pulse in marine seismic sources by injection of additional air
    31.
    发明授权
    System for suppressing multiple pulse in marine seismic sources by injection of additional air 失效
    通过注射附加空气来抑制海洋地震源中的多个脉冲的系统

    公开(公告)号：US3601216A

    公开(公告)日：1971-08-24

    申请号：US3601216D

    申请日：1967-10-23

    Applicant: MANDREL INDUSTRIES

    Inventor： MOTT-SMITH LEWIS M

    IPC: G01V1/137 ,  G01V1/387 ,  G01V1/04 ,  G01V1/38

    CPC classification number: G01V1/137 ,  G01V1/387

    Abstract: Apparatus and method for suppressing the initial and subsequent contractions of an air bubble used to generate a seismic signal, wherein the preferred embodiment a source of suppressor air is located immediately adjacent to the air valve source which creates the bubble, whereby the source of suppressor air is located within the expanded bubble when it approaches its largest diameter to allow the sudden and rapid release of suppressor air into the bubble to retard the contraction of the bubble. In a second embodiment, the air valve source itself defines the source of suppressor air.

    Null loop for correcting low frequency error signals in high performance amplifiers
    38.
    发明授权
    Null loop for correcting low frequency error signals in high performance amplifiers 失效
    用于校正高性能放大器中的低频误差信号的空循环

    公开(公告)号：US3801919A

    公开(公告)日：1974-04-02

    申请号：US3801919D

    申请日：1972-10-30

    Applicant: MANDREL INDUSTRIES

    Inventor： WILKES D ,  THOMPSON C

    IPC: H03F1/30 ,  H03F1/26

    CPC classification number: H03F1/303 ,  H03F2200/372

    Abstract: A feedback null loop includes a low drift, first loop amplifier connected to the output of a fast settling, large drift amplifier means which is to be corrected for AC and DC errors due to stray signal coupling. A second loop amplifier with high impedance is coupled to the low drift first loop amplifier via electronic switch means. A ground line is provided to the input of the large drift amplifier means; e.g., via the conventional multiplexer apparatus in a multi-channel data acquisition system, whereby the output voltage of the amplifier means is nulled to zero. Prior to opening the switch means in the null loop, a capacitor stores a fixed voltage representing the error signal. Thereafter, as the multiplexer apparatus selects successive channels of the data acquisition system, any DC off-set levels are balanced out via the temporarily stored capacitor voltage.

    Abstract translation: 反馈空回路包括连接到快速稳定的大漂移放大器装置的输出的低漂移，第一环路放大器，由于杂散信号耦合而被校正的AC和DC误差。 具有高阻抗的第二环路放大器通过电子开关装置耦合到低漂移第一环路放大器。 地线被提供给大型漂移放大器装置的输入端; 例如通过多通道数据采集系统中的常规多路复用器装置，由此放大器装置的输出电压为零。 在零开环之前打开开关装置，电容器存储表示误差信号的固定电压。 此后，随着多路复用器选择数据采集系统的连续通道，任何直流偏移电平都通过临时存储的电容器电压进行平衡。

    Sorting machine
    39.
    发明授权
    Sorting machine 失效
    分拣机

    公开(公告)号：US3738484A

    公开(公告)日：1973-06-12

    申请号：US3738484D

    申请日：1971-03-15

    Applicant: MANDREL INDUSTRIES

    Inventor： HOOVER M ,  LONG W

    IPC: B07C5/342 ,  B07C1/04

    CPC classification number: B07C5/366 ,  B07C5/3425 ,  Y10S209/908

    Abstract: A number of steeply inclined tapered slides are arranged for gravity assisted singulation and alignment of items such as rice grains that are introduced at the top from vibrating chutes that are gently inclined in the opposite direction. The chutes extend from a common vibrating feed tray and have adjustable entrance gates to equalize the flow rates of the items. A stationary hopper supplies the feed tray through a flexible coupling. At the bottom of each slide, a photoelectric viewer is arranged to operate an ejector for diverting grains having dark spots. A variable background is provided and is adjusted so that the signal induced thereby is identical to that of the mid-portion of an acceptable grain. Light sources are positioned both above and below the photoelectric means so as to provide extra illumination for the leading and trailing ends of each grain, thus to avoid spurious signals similar to those induced by dark spots but caused by the rounded ends of acceptable grains.

    Abstract translation: 一些陡峭倾斜的锥形滑块被布置用于重力辅助分离和对准诸如从在相反方向上轻轻倾斜的振动滑槽顶部引入的米粒。 滑槽从共同的振动进料盘延伸，并具有可调节的入口门，以均衡物品的流速。 固定料斗通过柔性联轴器供给进料盘。 在每个载玻片的底部，布置一个光电观察器来操作喷射器以转移具有黑点的颗粒。 提供可变背景并进行调整，使得由此引起的信号与可接受的颗粒的中间部分相同。 光源位于光电装置的上方和下方，以便为每个晶粒的前端和尾端提供额外的照明，从而避免类似于由黑点引起的杂散信号，但是由可接受的晶粒的圆形端引起。

    Digital phase-correcting servo for controlling the phase of an analog drive signal
    40.
    发明授权
    Digital phase-correcting servo for controlling the phase of an analog drive signal 失效
    用于控制模拟驱动信号相位的数字相位校正伺服器

    公开(公告)号：US3626267A

    公开(公告)日：1971-12-07

    申请号：US3626267D

    申请日：1970-11-06

    Applicant: MANDREL INDUSTRIES

    Inventor： BOBBITT JOHN T

    IPC: G01V1/04 ,  H03H17/08 ,  G05B19/28

    CPC classification number: H03H17/08 ,  G01V1/04

    Abstract: An analog drive signal for driving a vibrator, motor, or like driven apparatus, is converted to a digital signal and is delayed in a digital buffer memory. The memory is unloaded at two separate discrete times and the resulting digital signals are converted to provide an analog reference signal and an analog drive signal. The reference signal is unloaded at a constant rate relative to the input load rate but is displaced in time by a selected number of total memory locations. The drive signal is unloaded at a programmable rate. The phase relation, i.e., error signal, and signals indicative of the lead or lag of the error signal relative to the reference signal, are sensed and any phase difference detected is counted in units of sample rate time and stored. Associated digital control logic is programmed to cause the drive signal to move the detected number of samples in the memory, in the commensurate direction, to correct the phase of the driven apparatus output, i.e., to provide a zero phase difference relative to the phase of the reference signal. The servo may be preset for minimum initial phase shift by noting the maximum error at the beginning of a test sweep, and by presetting the system correspondingly to start it in phase.

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