公开(公告)号：US4166963A

公开(公告)日：1979-09-04

申请号：US835257

申请日：1977-09-21

申请人： Eric Metcalf

发明人： Eric Metcalf

IPC分类号： H03K19/0175 ,  H03K5/00

CPC分类号： H03K19/017545

摘要： A line buffer circuit for coupling an interface to a data highway without requiring separate signal paths for sense and drive functions, comprises a unity-gain voltage amplifier coupling a line in the highway to the respective interface terminal for the sense function, and a current source connected to sink current from the highway line to ground for the drive function. The current source is controlled so that the current passing through it is proportional to the magnitude of the current passing from the amplifier through the interface terminal.

摘要翻译： 一种用于将接口耦合到数据高速公路而不需要用于感测和驱动功能的单独的信号路径的线路缓冲器电路，包括将公路中的线路耦合到用于感测功能的相应接口端子的单位增益电压放大器，以及电流源 连接到电流从公路线到地面的驱动功能。 控制电流源，使得通过它的电流与从放大器通过接口端子的电流的大小成比例。

公开(公告)号：US4663965A

公开(公告)日：1987-05-12

申请号：US672421

申请日：1984-11-16

申请人： Eric Metcalf ,  Peter Ormiston ,  Michael J. Skinner ,  Bruce J. Pike

发明人： Eric Metcalf ,  Peter Ormiston ,  Michael J. Skinner ,  Bruce J. Pike

IPC分类号： G01L7/00 ,  G01L9/00 ,  G01M3/32 ,  G01M3/34

CPC分类号： G01M3/3272 ,  G01L9/0033

摘要： It is proposed to store spent nuclear fuel elements in welded-shut steel containers, which are filled with argon at about 2 atmospheres pressure. It is desirable to be able periodically to check the containers for leaks. The invention proposes to do this by providing apparatus for sensing the pressure within the container from outside the container. To achieve this, a pressure responsive bellows is mounted inside the container, such that changes in the container pressure move a metal plate attached to the bellows towards or away from a portion of the inside wall of the container. Then, if the container starts to develop a leak, the pressure will begin to drop, and the gap between the metal plate and the wall will change. This gap can be sensed from outside the container, by an ultrasonic pulse echo technique. Preferably, the bellows and plate are mounted within the head of the combined valve and lifting pintle by which the container is sealed.

摘要翻译： 建议将废核燃料元件储存在约2个大气压的氩气填充的封闭钢容器中。 期望能够周期性地检查容器是否有泄漏。 本发明提出通过提供用于从容器外部感测容器内的压力的装置来实现。 为了实现这一点，压力响应波纹管安装在容器内部，使得容器压力的变化使附接到波纹管的金属板朝向或远离容器的内壁的一部分移动。 然后，如果容器开始产生泄漏，则压力将开始下降，并且金属板和壁之间的间隙将改变。 可以通过超声波脉冲回波技术从容器外部检测该间隙。 优选地，波纹管和板安装在组合阀的头部和提升枢栓中，容器被密封。

公开(公告)号：US4445085A

公开(公告)日：1984-04-24

申请号：US449705

申请日：1982-12-14

申请人： Eric Metcalf ,  Jack Woollven ,  Stephen N. Spens ,  Brian L. A. Kett

发明人： Eric Metcalf ,  Jack Woollven ,  Stephen N. Spens ,  Brian L. A. Kett

IPC分类号： G01R31/08 ,  G01R31/28 ,  G01R31/302 ,  G01R31/315 ,  G06F11/22

CPC分类号： G01R31/088 ,  G01R31/28 ,  G01R31/2806 ,  G01R31/315 ,  G06F11/2273

摘要： A probe for sensing direction of flow of an injected current pulse along a conductor of a circuit under test is linked to an ATE, to be triggered to inject the pulse during a test sequence at a step previously found by the ATE to establish a faulty state in the circuit. Thus, the faulty one of several components connected to a circuit node can be identified. The probe itself can also be used independently, and injects an approximately triangular-waveform current pulse which has a steep rising edge and a less steep falling edge, thereby inducing a voltage pulse which is asymmetric about the zero voltage level and thus permits discrimination of the direction of current flow. The probe may have a single current injection contact disposed between the limbs of a bifurcated core for the pick-up coil.

摘要翻译： 用于感测沿着被测电路的导体的注入电流脉冲的流动方向的探针被连接到ATE，以被触发以在ATE先前发现的步骤的测试序列期间注入脉冲以建立故障状态 在电路中。 因此，可以识别连接到电路节点的多个组件中的故障之一。 探头本身也可以独立使用，并且注入大约三角波形的电流脉冲，其具有陡峭的上升沿和较不陡峭的下降沿，从而产生在零电压电平上不对称的电压脉冲，从而允许区分 电流方向。 探针可以具有设置在用于拾取线圈的分叉芯的四肢之间的单电流注入接触。

公开(公告)号：US4428061A

公开(公告)日：1984-01-24

申请号：US234533

申请日：1981-02-17

申请人： Michael J. Skinner ,  Jack Woollven ,  Eric Metcalf ,  Howard A. Dorey

发明人： Michael J. Skinner ,  Jack Woollven ,  Eric Metcalf ,  Howard A. Dorey

IPC分类号： H02J13/00 ,  H03M5/12 ,  H04B3/54 ,  H04L1/00 ,  H04L25/49 ,  H04L27/00 ,  G06F15/34 ,  H04L27/18 ,  H04L27/22

CPC分类号： H02J13/0037 ,  H04B3/542 ,  H04B2203/5416 ,  H04B2203/5433 ,  H04B2203/5441 ,  H04B2203/5487 ,  H04B2203/5491 ,  Y02E60/7892 ,  Y04S40/146

摘要： A receiver, for receiving a signal comprising a carrier signal modulated with a digital signal, comprises a circuit for demodulating the received signal to produce an output signal which contains the digital signal. Because of repeated filtering, the digital signal is typically in the form of an approximately sinusoidal signal, which has a component whose frequency is equal to half the basic bit rate of the digital signal: because of noise, this component is subject to considerable timing jitter. To overcome this, the output signal is digitized and applied to a digital correlator, where it is correlated with a reference signal whose frequency is also equal to half the basic bit rate of the digital signal. The reference signal is preferably derived from a phase-locked loop locked to the carrier frequency. The correlator, which is constituted by a microprocessor, determines the instants of time which most nearly coincide with the mean-level crossing points of said component (which instants correspond to transitions between one bit of the digital signal and the next), and also determines successive bit values on the basis of the coincidence determination. The receiver can be used to receive mains-borne signals, i.e. signals transmitted over an electrical power supply network, or radio broadcast signals.

公开(公告)号：US4388727A

公开(公告)日：1983-06-14

申请号：US235276

申请日：1981-02-17

申请人： Eric Metcalf

发明人： Eric Metcalf

IPC分类号： H02J13/00 ,  H03M5/12 ,  H04B3/54 ,  H04L1/00 ,  H04L25/49 ,  H04L27/00 ,  H04L27/14 ,  H04B1/26

CPC分类号： H02J13/0037 ,  H04B3/542 ,  H04B2203/5416 ,  H04B2203/5433 ,  H04B2203/5441 ,  H04B2203/5487 ,  H04B2203/5491 ,  Y02E60/7892 ,  Y04S40/146

摘要： A receiver, for receiving a signal comprising a carrier signal modulated with a digital signal, comprises means for demodulating the received signal to produce an output signal which contains the digital signal. Because of repeated filtering, the digital signal is typically in the form of an approximately sinusoidal signal, which has a component whose frequency is equal to half the basic bit rate of the digital signal: because of noise, this component is subject to considerable timing jitter. To overcome this, the output signal is digitized and applied to a digital correlator, where it is correlated with a reference signal whose frequency is also equal to half the basic bit rate of the digital signal. The reference signal is preferably derived from a phase-locked loop locked to the carrier frequency. The correlator, which is constituted by a microprocessor, determines the instants of time which most nearly coincide with the mean-level crossing points of said component (which instants correspond to transitions between one bit of the digital signal and the next), and also determines successive bit values on the basis of the coincidence determination. The receiver can be used to receive mains-borne signals, i.e. signals transmitted over an electrical power supply network, or radio broadcast signals. The received signals employ at least one of two or more carrier frequencies derived from a common oscillator, and the receiver includes a phase locked loop capable of locking a local oscillator in the receiver to whichever of the carrier frequencies is being received.

摘要翻译： 用于接收包括用数字信号调制的载波信号的信号的接收机包括用于解调接收信号以产生包含数字信号的输出信号的装置。 由于重复滤波，数字信号通常是近似正弦信号的形式，它具有频率等于数字信号的基本比特率的一半的分量：由于噪声，该分量经受相当大的定时抖动 。 为了克服这个原因，输出信号被数字化并应用于数字相关器，其中它与频率也等于数字信号的基本位速率的一半的参考信号相关。 参考信号优选地从锁定到载波频率的锁相环导出。 由微处理器构成的相关器确定最接近于所述分量的平均电平交叉点（时刻对应于数字信号的一比特与下一个之间的转换）的时间的时刻，并且还确定 基于重合确定的连续比特值。 接收机可用于接收市电传送的信号，即通过电力供应网络发送的信号或无线电广播信号。 所接收的信号使用从公共振荡器导出的两个或多个载波频率中的至少一个，并且接收机包括能够将接收机中的本地振荡器锁定到正在接收的载波频率中的哪一个的锁相环。

公开(公告)号：US4057756A

公开(公告)日：1977-11-08

申请号：US671883

申请日：1976-03-29

申请人： Anthony John Ley ,  Eric Metcalf ,  Michael Cedric Jeffery

发明人： Anthony John Ley ,  Eric Metcalf ,  Michael Cedric Jeffery

IPC分类号： G01R23/165 ,  G06F17/15 ,  G01R23/16

CPC分类号： G01R23/165 ,  G06F17/156

摘要： In a spectrum analyzer, the analogue signal to be analyzed is periodically sampled and digitized, and the digit samples are formed into R successive arrays each containing 2N successive samples and each overlapping the previous array by 50%. The forward Fourier transforms of each array are then successively formed, and an array of 2P complex points is formed from the result of each transform, where L-P/2 and L+P/2-1 are the points which represent the upper and lower limits of a Vernier band to be studied in detail and each array extends from points L-P to L+P-1 (i.e. each array is twice the width of the Vernier band, and the Vernier band is symmetrically disposed therein): additionally, each array for which L and R are odd is complemented. The arrays thus formed are then each multiplied by a window function (effectively equivalent to a band pass filter), and the result is subjected to the inverse Fourier transform to form respective further arrays of 2P points. The central points (from P/2 to 3P/2-1) of each of these further arrays are allowed to build up into a continuous array, and the M most recent points, where M is twice the required number of points in the Vernier band, are subjected to the forward Fourier transform to form M complex points, of which the middle points (from M/4 to 3M/4-1) are the desired result.This analyzer has the advantage that the Vernier band can be digitally positioned anywhere in the frequency band covered by the first forward Fourier transform.

摘要翻译： 在频谱分析仪中，要对待分析的模拟信号进行周期性采样和数字化，并将数字样本形成为R个连续的阵列，每个阵列包含2N个连续的样本，并且每个重复先前的阵列50％。 然后连续形成每个阵列的前向傅里叶变换，并根据每个变换的结果形成2P个复数点的阵列，其中LP / 2和L + P / 2-1是表示上下限的点 的游标波段进行详细研究，每个阵列从点LP延伸到L + P-1（即每个阵列是游标波段的宽度的两倍，游标波束对称地设置在其中）：另外，每个阵列 L和R是奇数的是补码的。 然后将由此形成的阵列乘以窗函数（实际上等效于带通滤波器），并且对结果进行傅立叶反变换以形成2P个点的另外的阵列。 允许将这些其他阵列中的每一个的中心点（从P / 2到3P / 2-1）建立成连续的阵列，并且M个最近的点，其中M是游标中所需点数的两倍 进行前向傅里叶变换以形成M个复点，其中点（从M / 4到3M / 4-1）是期望的结果。

公开(公告)号：US4047053A

公开(公告)日：1977-09-06

申请号：US602161

申请日：1975-08-06

申请人： Anthony John Ley ,  Eric Metcalf

发明人： Anthony John Ley ,  Eric Metcalf

IPC分类号： G06G7/28 ,  G11C27/04 ,  H01L27/10

CPC分类号： G11C27/04 ,  G06G7/28

摘要： The analogue storage circuit includes a charge transfer device such as a charge-coupled device (CCD) and a quantizing circuit. The charge transfer device is arranged to shift an analogue signal from its input to its output, the analogue signal being subject to a change in magnitude during such shifting.The quantizing circuit receives the analogue signal from the output of the charge transfer device and quantizes that signal at a respective one of several substantially discrete levels. The quantizing circuit is arranged to apply the quantized analogue signal to the input of the charge transfer device, whereby in operation the analogue signal is circulated round the loop defined by the charge transfer device and the quantizing circuit. The quantizing circuit is further arranged to quantize the analogue signal, upon each subsequent receipt thereof, at the same one of the discrete levels. The storage circuit is provided with an input for introducing the analogue input signal to be stored, into the loop defined by the charge transfer device and the quantizing circuit.

摘要翻译： 模拟存储电路包括诸如电荷耦合器件（CCD）和量化电路的电荷转移器件。 电荷转移装置被布置成将模拟信号从其输入移动到其输出，模拟信号在这种移位期间经受大的变化。

公开(公告)号：USRE36285E

公开(公告)日：1999-08-31

申请号：US024743

申请日：1998-02-17

申请人： James Wolryche Stansfeld ,  Eric Metcalf

发明人： James Wolryche Stansfeld ,  Eric Metcalf

IPC分类号： G01K13/02 ,  G01K1/14

CPC分类号： G01K13/02

摘要： A thermocouple probe 10 suitable for use in a gas turbine engine comprises a thermocouple element 12 which is coaxially arranged inside a protective sheath 16. The thermocouple element 12 is resiliently supported by a helical member 18 which insulates the element 12 from deleterious vibrations induced in the sheath 16. In use, the thermocouple probe 10 projects through an aperture 30 in the casing 32 of a gas chamber 34. Vibrations in the probe 10 are further reduced by ensuring that the longitudinal axis AA of the probe is angularly offset from the central axis BB of the aperture 30, such that the outer periphery of the sheath 16 is in contact with the inner periphery of the aperture 30 in two diametrically opposite and axially offset locations.

摘要翻译： 适用于燃气涡轮发动机的热电偶探头10包括同轴地布置在保护套16内部的热电偶元件12.热电偶元件12由螺旋构件18弹性地支撑，螺旋构件18将元件12与在 护套16.在使用中，热电偶探针10通过气体室34的壳体32中的孔30突出。探针10中的振动通过确保探针的纵向轴线AA与中心轴线成角度偏移而进一步减小 BB，使得护套16的外周在两个直径相对和轴向偏移的位置处与孔30的内周边接触。

公开(公告)号：US5423610A

公开(公告)日：1995-06-13

申请号：US142184

申请日：1993-10-26

申请人： James W. Stansfeld ,  Eric Metcalf

发明人： James W. Stansfeld ,  Eric Metcalf

IPC分类号： G01K13/02 ,  G01K7/04 ,  G01K1/14

CPC分类号： G01K13/02

摘要： A thermocouple probe 10 suitable for use in a gas turbine engine comprises a thermocouple element 12 which is coaxially arranged inside a protective sheath 16. The thermocouple element 12 is resiliently supported by a helical member 18 which insulates the element 12 from deleterious vibrations induced in the sheath 16 by alternately contacting the protective sheath (16) and the thermocouple element (12).

摘要翻译： 适用于燃气涡轮发动机的热电偶探头10包括同轴地布置在保护套16内部的热电偶元件12.热电偶元件12由螺旋构件18弹性地支撑，螺旋构件18将元件12与在 通过交替地接触保护套（16）和热电偶元件（12）来形成鞘16。

公开(公告)号：US5105665A

公开(公告)日：1992-04-21

申请号：US567024

申请日：1990-08-14

申请人： Philip Parsons ,  Jolyon P. Willson ,  Eric Metcalf

发明人： Philip Parsons ,  Jolyon P. Willson ,  Eric Metcalf

IPC分类号： G01H9/00 ,  G01D3/036 ,  G01L9/00

CPC分类号： G01D3/036 ,  G01L9/0019 ,  G01L9/002 ,  G01L9/0022 ,  G01L9/0023 ,  Y10S73/01

摘要： In a micromachined silicon pressure sensor comprising a resonantly vibratable beam supported on a diaphragm, the beam is indirectly excited into resonant vibration by directing an optical excitation signal at the beam resonant frequency onto a part of the sensor other than the beam, preferably the diaphragm. Preferably, the optical excitation signal is of a wavelength to which the sensor is fairly transparent, and is directed through the beam and diaphragm to be absorbed by a suitable coating on the underside of the diaphragm. The optical excitation signal produces local heating, and the resulting expansions and contractions at the beam resonant frequency propagate through the sensor structure to excite the beam into resonant vibration. Another optical signal is used to detect the frequency of vibration of the beam, and a positive feedback loop maintains the frequency of the excitation signal equal to the detected beam vibration frequency. In a modification, the indirect excitation is achieved by forming resistors or piezoelectric devices in a part of the sensor other than the beam, so that the expansions and contractions mentioned above can be excited electrically rather than optically.