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公开(公告)号：EP0970387B1
公开(公告)日：2006-05-10
申请号：EP99901136.4
申请日：1999-01-22
IPC分类号： G01R27/26
CPC分类号： G01R27/2605
摘要： A static capacitance-to-voltage converter is capable of converting a static capacitance into a voltage without suffering from a stray capacitance formed between a signal and a shielding line or a stray capacitance formed between an exposed portion of the signal line and its surroundings. The static capacitance-to-voltage converter is formed of an operational amplifier placed in an imaginary short-circuit state between an inverting input and a non-inverting input thereof; a signal line having one end connected to the inverting input and the other end capable of being connected to a static capacitance; a shielding line surrounding the signal line and connected to the non-inverting input; an alternate current signal generator for applying the non-inverting input with an alternate current signal; and zero adjusters for adjusting the output of the static capacitance-to-voltage converter to minimum when no static capacitance is connected to the signal line.
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2.发明授权IMPEDANCE DETECTOR CIRCUIT, IMPEDANCE DETECTOR AND METHOD OF IMPEDANCE DETECTION 有权阻抗测量电路，阻抗测量探测器和方法
公开(公告)号：EP1219967B1
公开(公告)日：2007-07-25
申请号：EP01912131.8
申请日：2001-03-07
CPC分类号： G01R27/02
摘要： A second operational amplifier (11) of a core (1) has an inverting input terminal and an output terminal that are short-circuited. A signal line (19) is connected to the noninverting input terminal of the second operational amplifier. A capacitance sensor (18) is connected to the signal line (19). A first operational amplifier (12) has a noninverting input terminal grounded. The inverting input terminal of the first operational amplifier is connected to first and second resistors (15, 16) on one end. The other end of the first resistor (15) is connected to an AC voltage generator (14). The other end of the second resistor (16) is connected to the output terminal of the first operational amplifier (11). The core (1) has a signal output terminal (21) connected to an inverting amplifier (2). An addition device (3) is connected to an AC output terminal (22) of the core (1) and the inverted output terminal (42) of the inverting amplifier (2). The noninverting input terminals of the operational amplifiers (36, 40) is grounded.
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公开(公告)号：EP0970386B8
公开(公告)日：2006-06-21
申请号：EP99900308.0
申请日：1999-01-14
IPC分类号： G01R27/26
CPC分类号： G01R27/2605
摘要： An impedance-to-voltage converter for converting an impedance of a target to a voltage is described which comprises an operational amplifier (OP), a coaxial cable consisting of a signal line and shielding element(s), and an AC signal generator. A feedback impedance circuit is connected between output and inverting terminals of the OP, and whereby a non-inverting terminal and the inverting terminal are an imaginal-short condition. One end of the signal line is connected to the inverting input terminal of the OP and the other end is connected to one electrode of the target and the AC signal generator is connected to the non-inverting input terminal of the OP. The shielding element comprises at least one shielding layer surrounding the signal line and is connected to the non-inverting input terminal of the OP, and thus the signal line and the shielding layer are the same voltage due to the imaginal-short of the input terminals of the OP, resulting in reduction of noise on the signal line.
摘要翻译： 描述了用于将目标的阻抗转换为电压的阻抗 - 电压转换器，其包括运算放大器（OP），由信号线和屏蔽元件组成的同轴电缆以及AC信号发生器。 反馈阻抗电路连接在OP的输出端和反相端之间，并且其中非反相端和反相端是成像短路条件。 信号线的一端连接到OP的反相输入端子，另一端连接到目标的一个电极，交流信号发生器连接到OP的同相输入端子。 屏蔽元件包括围绕信号线的至少一个屏蔽层并且连接到OP的非反相输入端子，因此信号线和屏蔽层由于输入端子的成像不足而具有相同的电压 的OP，从而减少信号线上的噪声。
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公开(公告)号：EP0970386B1
公开(公告)日：2006-05-03
申请号：EP99900308.0
申请日：1999-01-14
IPC分类号： G01R27/26
CPC分类号： G01R27/2605
摘要： An impedance-to-voltage converter for converting an impedance of a target to a voltage is described which comprises an operational amplifier (OP), a coaxial cable consisting of a signal line and shielding element(s), and an AC signal generator. A feedback impedance circuit is connected between output and inverting terminals of the OP, and whereby a non-inverting terminal and the inverting terminal are an imaginal-short condition. One end of the signal line is connected to the inverting input terminal of the OP and the other end is connected to one electrode of the target and the AC signal generator is connected to the non-inverting input terminal of the OP. The shielding element comprises at least one shielding layer surrounding the signal line and is connected to the non-inverting input terminal of the OP, and thus the signal line and the shielding layer are the same voltage due to the imaginal-short of the input terminals of the OP, resulting in reduction of noise on the signal line.
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5.发明公开POTENTIAL FIXING DEVICE, POTENTIAL FIXING METHOD, AND CAPACITANCE MEARUING INSTRUMENT 审中-公开可能的固定装置，可能的固定方法以及电容测量仪器
公开(公告)号：EP1555535A1
公开(公告)日：2005-07-20
申请号：EP02777897.6
申请日：2002-10-22
CPC分类号： G01R27/26
摘要： An electric potential fixing apparatus is provided that can prevent the combined total amount of electricity of a connection line between the first capacitance and the second capacitance from changing even when the electric potential of the connection line between the first capacitance and the second capacitance is fixed in the case where the first capacitance and the second capacitance are directly connected.
This electric potential fixing apparatus has the first high resistance (3) and the second high resistance (4) and includes a voltage supply circuit (1) that preserves the combined total amount of electric charge of a measuring capacitance (14) and a fixed capacitance (15) and maintains constant the electric potential of a signal line (17) that connects the measuring capacitance (14) and the fixed capacitance (15). And an output terminal (5) of the voltage supply circuit (1) is connected to the signal line (17).摘要翻译： 提供了一种电位固定设备，其能够即使当第一电容和第二电容之间的连接线的电位被固定在第一电容和第二电容之间时，也能够防止第一电容和第二电容之间的连接线的合计总电量变化 第一电容和第二电容直接连接的情况。 该电位固定装置具有第一高电阻（3）和第二高电阻（4），并且包括电压供应电路（1），其保持测量电容（14）的总电荷总量和固定电容 （15）并且保持连接测量电容（14）和固定电容（15）的信号线（17）的电位恒定。 并且电压供应电路（1）的输出端（5）连接到信号线（17）。
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6.发明公开IMPEDANCE DETECTOR CIRCUIT, IMPEDANCE DETECTOR AND METHOD OF IMPEDANCE DETECTION 有权IMPEDANZMESSUNGSSCHALTKREIS，DETERKTOR UND VERFAHREN ZUR IMPEDANZMESSUNG
公开(公告)号：EP1219967A1
公开(公告)日：2002-07-03
申请号：EP01912131.8
申请日：2001-03-07
CPC分类号： G01R27/02
摘要： A second operational amplifier (11) of a core unit (1) shorts an inverting input terminal and an output terminal. A signal line (19) is connected to a non-inverting input terminal. A capacitive sensor (18) is connected to the signal line (19). A first operational amplifier (12) earths the non-inverting input terminal. One end of a first resistance (15) and one end of a second resistance (16) are respectively connected to the inverting input terminal. The other end of the first resistance (15) is connected to an alternate current voltage generator (14). The other end of the second resistance (16) is connected to the output terminal of the first operational amplifier (11). A signal output terminal (21) of the core unit (1) is connected to an inverting amplification device (2). An alternate output terminal (22) of the core unit (1) and an inverting output terminal (42) of the inverting amplification device (2) are connected to an addition device (3). The non-inverting input terminal of operational amplifiers (36) and (40).
摘要翻译： 核心单元（1）的第二运算放大器（11）使反相输入端子和输出端子短路。 信号线（19）连接到非反相输入端子。 电容传感器（18）连接到信号线（19）。 第一运算放大器（12）接地非反相输入端。 第一电阻（15）的一端和第二电阻（16）的一端分别连接到反相输入端子。 第一电阻（15）的另一端连接到交流电压发生器（14）。 第二电阻（16）的另一端连接到第一运算放大器（11）的输出端。 核心单元（1）的信号输出端子（21）连接到反相放大装置（2）。 核心单元（1）的替代输出端（22）和反相放大装置（2）的反相输出端（42）连接到加法装置（3）。 运算放大器（36）和（40）的非反相输入端。
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公开(公告)号：EP0970387A1
公开(公告)日：2000-01-12
申请号：EP99901136.4
申请日：1999-01-22
IPC分类号： G01R27/26
CPC分类号： G01R27/2605
摘要： A static capacitance-to-voltage converter is capable of converting a static capacitance into a voltage without suffering from a stray capacitance formed between a signal and a shielding line or a stray capacitance formed between an exposed portion of the signal line and its surroundings. The static capacitance-to-voltage converter is formed of an operational amplifier placed in an imaginary short-circuit state between an inverting input and a non-inverting input thereof; a signal line having one end connected to the inverting input and the other end capable of being connected to a static capacitance; a shielding line surrounding the signal line and connected to the non-inverting input; an alternate current signal generator for applying the non-inverting input with an alternate current signal; and zero adjusters for adjusting the output of the static capacitance-to-voltage converter to minimum when no static capacitance is connected to the signal line.
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公开(公告)号：EP0970386A1
公开(公告)日：2000-01-12
申请号：EP99900308.0
申请日：1999-01-14
IPC分类号： G01R27/26
CPC分类号： G01R27/2605
摘要： An impedance-to-voltage converter for converting an impedance of a target to a voltage is described which comprises an operational amplifier (OP), a coaxial cable consisting of a signal line and shielding element(s), and an AC signal generator. A feedback impedance circuit is connected between output and inverting terminals of the OP, and whereby a non-inverting terminal and the inverting terminal are an imaginal-short condition. One end of the signal line is connected to the inverting input terminal of the OP and the other end is connected to one electrode of the target and the AC signal generator is connected to the non-inverting input terminal of the OP. The shielding element comprises at least one shielding layer surrounding the signal line and is connected to the non-inverting input terminal of the OP, and thus the signal line and the shielding layer are the same voltage due to the imaginal-short of the input terminals of the OP, resulting in reduction of noise on the signal line.
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