Offset drift reducing device for use in a differential amplification
circuit
    1.
    发明授权
    Offset drift reducing device for use in a differential amplification circuit 失效
    用于差分放大电路的偏移漂移降低装置

    公开(公告)号:US5276367A

    公开(公告)日:1994-01-04

    申请号:US885894

    申请日:1992-05-20

    IPC分类号: H03K5/24

    CPC分类号: H03K5/2481 H03K5/249

    摘要: In a measuring differential amplifier having first and second input terminals for subtracting a first signal applied to the first input terminal from a second signal applied to the second input terminal to obtain a subtraction and for outputting a signal corresponding to A times of the subtraction, a circuit for reducing an offset generated during measurement. Prior to the measurement, the second signal is applied to the first and second input terminals so that the differential amplifier outputs a voltage corresponding to A times of a difference between the second signals, i.e., A times an offset voltage. At this time, the differential amplifier is connected at its output terminal to one end of a capacitor grounded at the other end so that the voltage corresponding to A times of the offset voltage is applied to the capacitor for charging. During the measurement, the output terminal of the differential amplifier is disconnected from one end of the capacitor so that the voltage charged in the capacitor is applied to the adder and multiplied by 1/A to become again the offset voltage. The adder adds a signal indicative of the offset voltage to the first signal to obtain an addition signal and supplies the addition signal to the first input terminal of the differential amplifier. Thus, the input offset voltage is canceled by an offset voltage newly generated at the differential amplifier.

    摘要翻译: 在具有第一和第二输入端的测量差分放大器中,用于从施加到第二输入端的第二信号中减去施加到第一输入端的第一信号以获得减法并输出与减法的A次相对应的信号, 用于减少测量期间产生的偏移的电路。 在测量之前,第二信号被施加到第一和第二输入端子,使得差分放大器输出对应于第二信号之间的差的A倍的电压,即A乘以偏移电压。 此时,差分放大器在其输出端子连接到在另一端接地的电容器的一端,使得对应于偏移电压的A倍的电压被施加到用于充电的电容器。 在测量期间,差分放大器的输出端与电容器的一端断开,使得电容器中充电的电压加到加法器上并乘以1 / A再次成为偏置电压。 加法器将表示偏移电压的信号与第一信号相加以获得相加信号,并将加法信号提供给差分放大器的第一输入端。 因此,输入偏移电压被差分放大器新产生的偏移电压抵消。

    System and method for transmitting and calculating data in shield machine
    2.
    发明授权
    System and method for transmitting and calculating data in shield machine 失效
    盾构机数据传输和计算系统及方法

    公开(公告)号:US5330292A

    公开(公告)日:1994-07-19

    申请号:US927672

    申请日:1992-09-29

    CPC分类号: G08C23/00 E21D9/093

    摘要: The present invention discloses a system and a method for transmitting data in a shield machine and for calculating the filling amount of a void by detecting the distance to the natural ground. The system and the method are capable of transmitting analogue signals or signals of relatively high frequencies with reliability, enabling an unskilled operator to accurately detect buried articles and accurately carry out the back-filling work. Therefore, an optical rotary joint (100) is disposed between a rotary cutter head (10) and a non-rotary shield body (2) to count time taken to detect the peak value of a reflected signal larger than a standard value or time taken to detect the zero cross position present prior to the peak value. In accordance with the counted time, the distance between the antenna and the natural ground is calculated and displayed. Then, the void volume is calculated in accordance with the distance so that a target value of the back-filling amount is set.

    摘要翻译: PCT No.PCT / JP91 / 00316 Sec。 371日期:1992年9月29日 102(e)日期1992年9月29日PCT 1991年3月8日PCT公布。 公开号WO91 / 14077 1991年9月19日,本发明公开了一种在屏蔽机中传送数据的系统和方法,用于通过检测距天然地面的距离来计算空隙的填充量。 该系统和方法能够以可靠的方式传输相对较高频率的模拟信号或信号,使得不熟练的操作者能够精确地检测埋置的物品并准确地执行后备工作。 因此,光学旋转接头(100)设置在旋转刀头(10)和非旋转屏蔽体(2)之间,以计数检测大于标准值或所用时间的反射信号的峰值所需的时间 以检测峰值之前存在的零交叉位置。 根据计时时间,计算并显示天线与天然地面之间的距离。 然后,根据距离计算空隙体积,使得设定填充量的目标值。

    Method and apparatus for detecting collapse of natural ground in shield
driving method
    3.
    发明授权
    Method and apparatus for detecting collapse of natural ground in shield driving method 失效
    用于检测盾构驱动方法中自然接地褶皱的方法和装置

    公开(公告)号:US5199818A

    公开(公告)日:1993-04-06

    申请号:US773560

    申请日:1991-11-06

    IPC分类号: E21D9/06 E21D9/087 E21D9/093

    CPC分类号: E21D9/093

    摘要: A method and an apparatus for performing measurement by a resistivity method in order to detect the thickness of a sludge layer on the outer periphery of a shield machine. A Wenner electrode row (14) on the outer periphery of the machine is used to measure reference resistivities to thereby detect certain resistivities in the depth direction of the natural ground and the sludge layer thickness. At the same time, a dipole electrode row (16) is used to measure voltage distributions in the depth direction of the natural ground and in the direction of the arrangement of the electrodes. The ratios of the values measured by the measurement dipole electrodes to those measured by the reference Wenner electrodes are calculated, and their distribution is charted. When mutually equal values in the distribution map are connected together by continuous curves, a contour-pattern image is obtained, which enables a configuration of the collapse of natural ground to be determined. Such as image can be displayed either two-dimensionally or three-dimensionally by image processing. If a plurality of sets of electrode rows (14) and (16) are arranged in the circumferential direction of the machine, and resistivities are detected while current having different frequencies is supplied, the collapse of the natural ground can be measured quickly.

    摘要翻译: PCT No.PCT / JP91 / 00317 Sec。 371日期1991年11月6日 102(e)日期1991年11月6日PCT 1991年3月8日PCT公布。 出版物WO91 / 14078 日期1991年9月19日。一种用于通过电阻率法进行测量以便检测盾构机外周上的污泥层的厚度的方法和装置。 使用机器外周的文纳电极列(14)来测量参考电阻,从而检测天然地面深度方向上的某些电阻率和污泥层厚度。 同时,使用偶极电极列(16)测量自然地面的深度方向和电极排列方向上的电压分布。 计算由测量偶极子电极测量的值与通过参考Wenner电极测量的值的比率,并绘制其分布。 当通过连续曲线将分布图中的相互相等的值连接在一起时,获得轮廓图案图像,其能够确定自然地面的崩溃的配置。 诸如图像可以通过图像处理二维或三维地显示。 如果在机器的圆周方向上布置多组电极列(14)和(16),并且在提供具有不同频率的电流的同时检测电阻率,则可以快速测量自然地面的塌陷。

    Apparatus having a pair of magnetic field generating cables for
measuring position of an underground excavator
    4.
    发明授权
    Apparatus having a pair of magnetic field generating cables for measuring position of an underground excavator 失效
    具有用于测量地下挖掘机位置的磁场发生电缆对的装置

    公开(公告)号:US5208538A

    公开(公告)日:1993-05-04

    申请号:US778166

    申请日:1991-12-20

    CPC分类号: E21B47/02224 E21D9/003

    摘要: A position measuring apparatus easily and accurately detects the position of an underground excavator, such as a shield excavator, during the underground excavation, and particularly the position thereof on a horizontal plane. The position measuring apparatus comprises a transmitter (10) including at least two cable loops (10a, 10b) which generate AC magnetic fields; a receiver (30) which detects the AC magnetic fields and produces signals representative of the detected fields; and a computing unit (60) which identifies the signals with respect to the originating cable loop and which calculates the position of the underground excavator (20). The two cable loops (10a, 10b) are substantially perpendicular to each other. The receiver (30) includes two magnetic field detecting elements (S.sub.1, S.sub.2) which are substantially perpendicular to each other. The receiver (30) is rotatably driven so as to maintain the magnetic field detecting elements (S.sub.1, S.sub.2) at constant angles to the cable loops (10a, 10b).

    摘要翻译: PCT No.PCT / JP90 / 00847 Sec。 371 1991年12月20日第 102(e)日期1991年12月20日PCT Filed 1990年6月29日PCT出版物 公开号WO91 / 日期:1991年1月10日。在地下挖掘期间,位置测量装置容易且精确地检测地下挖掘机(例如盾构挖掘机)的位置,特别是其在水平面上的位置。 位置测量装置包括发射器(10),其包括产生AC磁场的至少两个电缆环(10a,10b); 接收器(30),其检测AC磁场并产生表示检测到的场的信号; 以及计算单元(60),其识别相对于始发缆线回路的信号,并计算地下挖掘机(20)的位置。 两个电缆环(10a,10b)基本上彼此垂直。 接收器(30)包括基本上彼此垂直的两个磁场检测元件(S1,S2)。 接收器(30)被可旋转地驱动,以将磁场检测元件(S1,S2)保持与电缆环(10a,10b)成一定角度。