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公开(公告)号：US5663506A
公开(公告)日：1997-09-02
申请号：US517529
申请日：1995-08-21
CPC分类号： G01L9/125 , G01L15/00 , G01L19/02 , G01L9/0075
摘要： A monolithic temperature and pressure transducer having a plurality of capacitive sensors. The capacitors are formed from the same silicon substrate and are equally affected by temperature variations, including temperature gradients.
摘要翻译： 具有多个电容传感器的单片温度和压力传感器。 电容器由相同的硅衬底形成，并受温度变化（包括温度梯度）的等效影响。
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公开(公告)号：US4096758A
公开(公告)日：1978-06-27
申请号：US799957
申请日：1977-05-24
申请人： James O. Moore
发明人： James O. Moore
CPC分类号： G01L9/12 , G01L9/0086
摘要： A pressure to electric transducer is described employing an electrical capacitance formed by two parallel metal plates separated by a variable air gap, one of the plates being fixedly mounted and the other being movable to change the spacing in direct proportion to fluid pressure acting on an input element or capsule to which the movable plate is connected. The capacitance forms one leg of a negative feed back divider network, for controlling an operational amplifier so that its gain is directly proportional to the spacing of the plates. The amplifier is driven by a constant alternating current source so that its output is directly proportional to the applied pressure. The voltage output can be rectified and transformed in a conventional manner for transmission of a signal.
摘要翻译： 使用由两个由可变气隙分开的平行金属板形成的电容来描述对电传感器的压力，其中一个板被固定地安装，另一个可移动以与作用在输入端上的流体压力成正比地改变间隔 元件或胶囊，可移动板连接到该元件或胶囊。 电容形成负反馈分压网络的一条支路，用于控制运算放大器，使其增益与板的间隔成正比。 放大器由恒定的交流电源驱动，使其输出与施加的压力成正比。 电压输出可以以常规方式进行整流和变换，以传输信号。
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公开(公告)号：US5804736A
公开(公告)日：1998-09-08
申请号：US790253
申请日：1997-01-27
CPC分类号： G01L19/0015 , G01L19/02 , G01L27/005 , G01L9/0019 , G01L9/0073 , G01L9/065 , G01L9/125
摘要： A pressure transducer having a redundant fluid pressure sensor can be used to determine if the pressure transducer needs to be recalibrated. The pressure transducer comprises a fluid pressure sensor for measuring differential pressure. The fluid pressure sensor includes a pair of substantially identical pressure sensors for providing a variable electrical output as a function of a differential fluid pressure and a reference sensor for providing an electrical output independent of the differential fluid pressure. A conditioning circuit is provided for generating a frequency-based signal whose frequency is a function of the electrical output for each fluid pressure sensor. The electrical output of the first and second pressure sensors can be compared to determine whether the pressure transducer needs to be calibrated. In one embodiment, the pressure sensors comprise variable capacitors. The first and second capacitors each have one fixed plate and one movable plate responsive to differential fluid pressure across the movable plate. The reference capacitor has two fixed plates. The first variable, second variable, and reference capacitors are all located in proximity to one another and in communication with the differential fluid pressure. The pressure transducer also includes a switching network connected to the capacitors for selectably connecting at least one of the capacitors to an electronic circuit.
摘要翻译： 可以使用具有冗余流体压力传感器的压力传感器来确定压力传感器是否需要被重新校准。 压力传感器包括用于测量差压的流体压力传感器。 流体压力传感器包括一对基本上相同的压力传感器，用于提供作为差动流体压力的函数的可变电输出和用于提供独立于差动流体压力的电输出的参考传感器。 提供调理电路，用于产生频率为每个流体压力传感器的电输出的函数的基于频率的信号。 可以比较第一和第二压力传感器的电气输出，以确定压力传感器是否需要校准。 在一个实施例中，压力传感器包括可变电容器。 第一和第二电容器各自具有一个固定板和一个可移动板，其响应于可移动板上的差动流体压力。 参考电容器有两个固定板。 第一可变，第二可变和参考电容器都位于彼此附近并与差分流体压力通信。 压力传感器还包括连接到电容器的开关网络，用于将至少一个电容器可选地连接到电子电路。
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公开(公告)号：US4616510A
公开(公告)日：1986-10-14
申请号：US723501
申请日：1985-04-15
申请人： James O. Moore
发明人： James O. Moore
IPC分类号： G01F1/66
CPC分类号： G01F1/667
摘要： An acoustic flow meter in which a plurality of different frequencies are transmitted in both upstream and downstream directions, and corresponding differences in transmission phase-delays due to such frequency changes detected and used to compute the fluid velocity by the formula ##EQU1## when L is the distance between transmitter and receiver, M.sub.D is the slope of the graph of phase delay vs. transmitted frequency for the upstream direction of transmission, and M.sub.u is the corresponding slope for the downstream direction. A signal processor using a least-squares algorithm is preferably employed to obtain best values for M.sub.D and M.sub.u from the several values of phase-delay difference produced by the several different transmitted frequencies.
摘要翻译： 一种其中在上下游方向上传输多个不同频率的声流计，以及由于这种频率变化引起的传输相位延迟的相应差异，并且当L为L时，通过公式“IMAGE”用于计算流体速度 发射机和接收机之间的距离，MD是上行传输方向的相位延迟与发射频率的曲线斜率，Mu是下游方向的相应斜率。 优选采用使用最小平方算法的信号处理器来从几个不同的发射频率产生的相位延迟差的几个值中获得MD和Mu的最佳值。
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公开(公告)号：US4110665A
公开(公告)日：1978-08-29
申请号：US815101
申请日：1977-07-13
申请人： James O. Moore
发明人： James O. Moore
CPC分类号： G01R13/405
摘要： A control circuit for bar graph display panels is described which reduces the tendency to drift, which obviates the necessity of maintaining an absolutely constant oscillator frequency and an absolutely constant ramp rate by utilizing a feedback system to reference the ramp end points to a single precise voltage.
摘要翻译： 描述了用于条形图显示面板的控制电路，其减少漂移的趋势，这消除了通过利用反馈系统将斜坡端点参考到单个精确电压来保持绝对恒定的振荡器频率和绝对恒定的斜率的必要性 。
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公开(公告)号：US6029524A
公开(公告)日：2000-02-29
申请号：US889707
申请日：1997-07-08
CPC分类号： G01L19/0015 , G01L19/02 , G01L27/005 , G01L9/0019 , G01L9/0073 , G01L9/065 , G01L9/125
摘要： A pressure transducer having a redundant fluid pressure sensor can be used to determine if the pressure transducer needs to be recalibrated. The pressure transducer comprises a fluid pressure sensor for measuring differential pressure. The fluid pressure sensor includes a pair of substantially identical pressure sensors for providing a variable electrical output as a function of a differential fluid pressure and a reference sensor for providing an electrical output independent of the differential fluid pressure. A conditioning circuit is provided for generating a frequency-based signal whose frequency is a function of the electrical output for each fluid pressure sensor. The electrical output of the first and second pressure sensors can be compared to determine whether the pressure transducer needs to be calibrated. In one embodiment, the pressure sensors comprise variable capacitors. The first and second capacitors each have one fixed plate and one movable plate responsive to differential fluid pressure across the movable plate. The reference capacitor has two fixed plates. The first variable, second variable, and reference capacitors are all located in proximity to one another and in communication with the differential fluid pressure. The pressure transducer also includes a switching network connected to the capacitors for selectable connecting at least one of the capacitors to an electronic circuit.
摘要翻译： 可以使用具有冗余流体压力传感器的压力传感器来确定压力传感器是否需要被重新校准。 压力传感器包括用于测量差压的流体压力传感器。 流体压力传感器包括一对基本上相同的压力传感器，用于提供作为差动流体压力的函数的可变电输出和用于提供独立于差动流体压力的电输出的参考传感器。 提供调理电路，用于产生频率为每个流体压力传感器的电输出的函数的基于频率的信号。 可以比较第一和第二压力传感器的电气输出，以确定压力传感器是否需要校准。 在一个实施例中，压力传感器包括可变电容器。 第一和第二电容器各自具有一个固定板和一个可移动板，其响应于可移动板上的差动流体压力。 参考电容器有两个固定板。 第一可变，第二可变和参考电容器都位于彼此附近并与差分流体压力通信。 压力传感器还包括连接到电容器的开关网络，用于将电容器中的至少一个可选地连接到电子电路。
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公开(公告)号：US5672808A
公开(公告)日：1997-09-30
申请号：US661851
申请日：1996-06-11
CPC分类号： G01L19/0015 , G01L19/02 , G01L27/005 , G01L9/0019 , G01L9/0073 , G01L9/065 , G01L9/125
摘要： A pressure transducer having a redundant fluid pressure sensor can be used to determine if the pressure transducer needs to be recalibrated. The pressure transducer comprises a fluid pressure sensor for measuring differential pressure. The fluid pressure sensor includes a pair of substantially identical pressure sensors for providing a variable electrical output as a function of a differential fluid pressure and a reference sensor for providing an electrical output independent of the differential fluid pressure. A conditioning circuit is provided for generating a frequency-based signal whose frequency is a function of the electrical output for each fluid pressure sensor. The electrical output of the first and second pressure sensors can be compared to determine whether the pressure transducer needs to be calibrated. In one embodiment, the pressure sensors comprise variable capacitors. The first and second capacitors each have one fixed plate and one movable plate responsive to differential fluid pressure across the movable plate. The reference capacitor has two fixed plates. The first variable, second variable, and reference capacitors are all located in proximity to one another and in communication with the differential fluid pressure. The pressure transducer also includes a switching network connected to the capacitors for selectably connecting at least one of the capacitors to an electronic circuit.
摘要翻译： 可以使用具有冗余流体压力传感器的压力传感器来确定压力传感器是否需要被重新校准。 压力传感器包括用于测量差压的流体压力传感器。 流体压力传感器包括一对基本上相同的压力传感器，用于提供作为差动流体压力的函数的可变电输出和用于提供独立于差动流体压力的电输出的参考传感器。 提供调理电路，用于产生频率为每个流体压力传感器的电输出的函数的基于频率的信号。 可以比较第一和第二压力传感器的电气输出，以确定压力传感器是否需要校准。 在一个实施例中，压力传感器包括可变电容器。 第一和第二电容器各自具有一个固定板和一个可移动板，其响应于可移动板上的差动流体压力。 参考电容器有两个固定板。 第一可变，第二可变和参考电容器都位于彼此附近并与差分流体压力通信。 压力传感器还包括连接到电容器的开关网络，用于将至少一个电容器可选地连接到电子电路。
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公开(公告)号：US4792818A
公开(公告)日：1988-12-20
申请号：US61841
申请日：1987-06-12
CPC分类号： B41J2/14129
摘要： A thermal drop-on-demand ink jet print head in which a heat delay means is provided covering a predetermined part of the resistive element. Upon connection of an electrical signal to energize the resistive element, nucleation occurs at an uncovered location on the resistive element and formation of the bubble proceeds in a direction toward the covered part of the resistive element to thereby utilize the inertial effect of the controlled bubble motion to eject a drop of ink in a more energy-efficient manner.
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公开(公告)号：US4163938A
公开(公告)日：1979-08-07
申请号：US901414
申请日：1978-05-01
申请人： James O. Moore
发明人： James O. Moore
CPC分类号： G01R13/405 , G01R35/005
摘要： A calibrating device is disclosed for insertion between a control station and its indicators, preferably of the bar graph type, with provisions for establishing accurate reference voltages available at marked jacks for use and specifically for checking the calibration of the indicating elements, and to provide for utilization of one or both indicators as a precision voltmeter for checking the potential of various points in the circuitry. Provisions are also made for bypass plugging in so that the indicators operate in a normal manner as if the calibrator were not present. The normal jacks also provide convenient access to the set-point and variable voltage of the station and facilitate the measuring of these voltages by an external digital voltmeter if desired.
摘要翻译： 公开了用于在控制站和其指示器之间插入的校准装置，优选地是条形图类型，其中提供用于建立在标记的插孔处可用的精确参考电压，并且专门用于检查指示元件的校准，并且提供 利用一个或两个指示器作为精密电压表来检查电路中各个点的电位。 还提供旁路插入的规定，以便指示器以正常的方式工作，就好像校准器不存在一样。 普通千斤顶还可方便地访问车站的设定点和可变电压，并且如果需要，可以通过外部数字电压表来方便测量这些电压。
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公开(公告)号：US5420578A
公开(公告)日：1995-05-30
申请号：US241689
申请日：1994-05-12
摘要： Integrated transmitters and controllers for use in monitoring process variables. A transmitter and controller for monitoring and controlling a process variable in a process control loop comprises a transmitter for producing a digital signal indicative of the process variable's state, and a digital controller supplied with the digital signal from the transmitter responsive to the digital signal, and further interfaced in a process control loop for controlling the process variable in response to the digitally communicated signal from the transmitter. Integrated transmitters and controllers described herein simplify installation and maintenance of industrial process control systems and place the controller functions at the process variable, thereby increasing control system efficiency.
摘要翻译： 用于监控过程变量的集成变送器和控制器。 用于监测和控制过程控制回路中的过程变量的发射机和控制器包括用于产生指示过程变量状态的数字信号的发射机和响应于数字信号的来自发射机的数字信号的数字控制器，以及 进一步连接在过程控制回路中，用于响应于来自发送器的数字通信信号来控制过程变量。 本文所述的集成发射器和控制器简化了工业过程控制系统的安装和维护，并将控制器功能放在过程变量上，从而提高了控制系统的效率。
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