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公开(公告)号：US4987782A
公开(公告)日：1991-01-29
申请号：US416698
申请日：1989-10-03
CPC分类号： G01L9/0075 , G01L9/125
摘要： A capacitive ratioing oscillator circuit utilizing a prior art pressure capsule, but through modification of the state variable oscillator circuit achieves a digital output which varies with the square root of the capacitance ratio C35 C.sub.p /C.sub.r. In this sensor the dielectric constant of the pressure media is measured in time with the pressure difference measurement. The oscillator includes a differentiator-inventor step herein each of capacitors C.sub.r and C.sub.p are connected to a common point and resistors are connected in parallel with each of said capacitors and with the common point connected to the inverting terminal of a first operational amplifier, a feedback line is connected from the output of the operational amplifier to the second resistor opposite the common point, first and second integrator circuits are connected to the output of said operational amplifier, a limit circuit is connected across the output of the second integrator circuit, and a feedback line is connected from the output of the second integrator circuit, and a feedback line is connected from the output of the second integrator circuit to the input of the inverter stage.
摘要翻译： 利用现有技术压力胶囊的电容比例振荡器电路，但是通过状态可变振荡器电路的修改实现了随电容比C35 Cp / Cr的平方根而变化的数字输出。 在该传感器中，压力介质的介电常数随着压力差测量在时间上进行测量。 振荡器包括微分器发明器步骤，电容器Cr和Cp中的每一个连接到公共点，并且电阻器与每个所述电容器并联连接，并且公共点连接到第一运算放大器的反相端子，反馈 线从运算放大器的输出连接到与公共点相反的第二电阻，第一和第二积分器电路连接到所述运算放大器的输出，限制电路连接在第二积分器电路的输出端上， 反馈线从第二积分电路的输出端连接，反馈线从第二积分电路的输出连接到逆变器级的输入。
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公开(公告)号：US4876892A
公开(公告)日：1989-10-31
申请号：US183103
申请日：1988-04-19
申请人： F. Gene Arabia , Zvi Shkedi , Randy L. Brandt
发明人： F. Gene Arabia , Zvi Shkedi , Randy L. Brandt
CPC分类号： G01L9/125
摘要： A pressure sensor includes a variable capacitor responsive to an applied fluid pressure to predictably change capacitance value. A tuned oscillator circuit having an inductive impedance includes the variable capicitor and simulates a resonant inductive-capacitive circuit not including an inductor. The tuned circuit oscillator to provide a signal with a period which is a function of the variable capacitance value, and of the applied fluid pressure. Additional elements are provided for precise measurement of the variable signal, correction for temperature effects, correction of measurement aberrations, and production of an output signal in a preferred format.
摘要翻译： 压力传感器包括响应于施加的流体压力的可变电容器以可预测地改变电容值。 具有电感阻抗的调谐振荡器电路包括可变电容器并且模拟不包括电感器的谐振电感电容电路。 调谐电路振荡器提供具有作为可变电容值的函数的周期的信号和所施加的流体压力的函数。 提供了附加元件，用于精确测量可变信号，校正温度效应，校正测量像差以及以优选格式生产输出信号。
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公开(公告)号：US20080292818A1
公开(公告)日：2008-11-27
申请号：US12121025
申请日：2008-05-15
申请人： Zvi Shkedi , Chaim Shaul Shkedi , Eliran Shkedi
发明人： Zvi Shkedi , Chaim Shaul Shkedi , Eliran Shkedi
IPC分类号： A47G33/00
CPC分类号： A47G33/00 , B42D19/00 , C09D11/107
摘要： A religious artifact including at least one scroll hand-written on kosher parchment in Hebrew, using flexible water-resistant kosher black ink. Such ink, when dry, does not dissolve in water and does not crack or peel off the surface, yet, when a mistake needs to be corrected, such ink can be scraped off the surface of the parchment without leaving a visible ink residue on the surface and without causing substantial damage to the parchment. The present invention provides for kosher scrolls which are less prone to and more resistant to becoming non-kosher, than scrolls of the prior art.
摘要翻译： 使用灵活的防水的犹太黑墨水，在希伯来语的犹太羊皮纸上手写的至少一个卷轴的宗教文物。 这种墨水干燥时不会溶解在水中，不会破裂或剥离表面，但是当需要纠正错误时，可以将这种墨水从羊皮纸的表面刮掉而不会在可见墨水残留物上留下 并且不会对羊皮纸造成实质性的损害。 本发明提供了比现有技术的卷轴更不易于并且更耐抵抗成为非犹太教的滚刷。
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公开(公告)号：US4763063A
公开(公告)日：1988-08-09
申请号：US759627
申请日：1985-07-26
申请人： Zvi Shkedi
发明人： Zvi Shkedi
摘要： A conditioning circuit for use with a pressure transducer is disclosed which provides a digitally readable electronic output signal indicative of capacitance sensed by the pressure transducer. The circuitry of the present invention utilizes an R-C charge/discharge circuit, thereby enabling the circuitry to be substantially more compact than previously utilized L-C circuits. The circuitry is usable with either pressure transducers having a single capacitance or those including a reference capacitance, and the circuitry provides a high resolution, high precision output.
摘要翻译： 公开了一种与压力传感器一起使用的调理电路，其提供了表示由压力传感器检测的电容的数字可读电子输出信号。 本发明的电路利用R-C充电/放电电路，从而使电路能够比先前使用的L-C电路更加紧凑。 电路可用于具有单个电容的压力传感器或包括参考电容的压力传感器，并且该电路提供高分辨率，高精度的输出。
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公开(公告)号：US4864463A
公开(公告)日：1989-09-05
申请号：US183110
申请日：1988-04-19
申请人： Zvi Shkedi , Donald C. Lips , William H. McCormack
发明人： Zvi Shkedi , Donald C. Lips , William H. McCormack
CPC分类号： G01L19/02 , G01L9/0075
摘要： A dual capacitive pressure sensor includes matched variable capacitors which are immune to vibration and acceleration, but which respond equally to changes in external fluid pressure level. The structure of the sensor is configured to avoid calibration drift as the sensor ages, as well as to provide electrical shielding for the variable capacitors of the sensor.
摘要翻译： 双电容式压力传感器包括匹配的可变电容器，其不受振动和加速度的影响，但对外部流体压力水平的变化也是相同的。 传感器的结构被配置为在传感器老化时避免校准漂移，以及为传感器的可变电容器提供电气屏蔽。
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公开(公告)号：US4689999A
公开(公告)日：1987-09-01
申请号：US759626
申请日：1985-07-26
申请人： Zvi Shkedi
发明人： Zvi Shkedi
CPC分类号： G01L19/02 , G01L9/0075
摘要： A quartz pressure transducer is disclosed which includes four or five elements, three of which are diaphragms containing deposited metal electrodes on both sides thereof. Since the electrodes are all on the diaphragms, the transducer disclosed herein is highly resistant to errors caused by changes in temperature, while retaining excellent resistance to errors caused by acceleration or vibration forces. The transducer may be constructed as either an absolute pressure sensor or as a differential pressure sensor, and in the primary embodiment contains a reference capacitance which may be used by appropriate electronic circuitry to provide compensation for acceleration or vibration forces, making the output of the pressure transducer of the present invention a highly accurate, highly sensitive indication of pressure sensed.
摘要翻译： 公开了一种石英压力传感器，其包括四个或五个元件，其中三个是其两侧包含沉积的金属电极的隔膜。 由于电极都在隔膜上，因此本文公开的换能器对由温度变化引起的误差具有很高的抵抗力，同时保持对加速度或振动力引起的误差的良好抵抗力。 传感器可以被构造为绝对压力传感器或差压传感器，并且在主要实施例中包含参考电容，该参考电容可由适当的电子电路用于为加速度或振动力提供补偿，从而使压力的输出 本发明的传感器是高度精确，高灵敏度的感测压力指示。
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