System and method for high resolution sensing of capacitance or other reactive impedance change in a large dynamic range
    1.
    发明授权
    System and method for high resolution sensing of capacitance or other reactive impedance change in a large dynamic range 有权
    用于高分辨率感测电容或其他无功阻抗的系统和方法在大动态范围内变化

    公开(公告)号:US07663377B2

    公开(公告)日:2010-02-16

    申请号:US11949462

    申请日:2007-12-03

    CPC classification number: G01R27/26

    Abstract: Systems and methods are provided for sensing or measuring capacitive or inductive reactance or changes in reactance in which the sensed reactance is coupled with a known resistance in a sensor circuit and a start signal is provided to the sensor circuit, and a programmable delay line is used to generate a programmable delay signal. The outputs of the programmable delay and the sensor circuits are compared to ascertain which transitions first, and the programmable delay value is adjusted in successive approximation fashion to identify a programmable delay that best represents the delay time of the sensor circuit from which the sensed reactance value can be determined.

    Abstract translation: 提供的系统和方法用于感测或测量电感或电抗或电抗变化,其中所感测的电抗与传感器电路中的已知电阻耦合,并且将启动信号提供给传感器电路,并且使用可编程延迟线 以产生可编程延迟信号。 将可编程延迟和传感器电路的输出进行比较,以确定首先进行哪些转换,并且以逐次近似的方式调整可编程延迟值,以识别最佳表示传感器电路的延迟时间的可编程延迟, 可以确定。

    Liquid level detector by guided elastic waves
    2.
    发明授权
    Liquid level detector by guided elastic waves 失效
    液位检测器通过引导弹性波

    公开(公告)号:US4765186A

    公开(公告)日:1988-08-23

    申请号:US31114

    申请日:1987-03-25

    CPC classification number: G01F23/2962 Y10S367/908

    Abstract: The liquid level detector using guided waves, comprises a first transducer situated out of the liquid for sending an incident elastic pulse which propagates in an elongated guide of which the lower part is immersed in the liquid, a second transducer situated out of the liquid and receiving the elastic pulse sent by the first transducer and transmitted by the guide, and electronic circuits for measuring the time elapsing between the transmission of an incident elastic pulse by the first transducer and the subsequent reception of the same elastic wave by the second transducer. The elongated guide comprises at least one smooth tube having no roughness in the longitudinal direction, the second transducer is situated in a fixed position close to the first transducer so as to receive the elastic pulse delivered by the first transducer after reflection thereof on the surface of the liquid in which is immersed the lower part of the guide, and the first transducer is arranged in such a manner with respect to the guide that periodical radial deformations of the tube are antisymmetrically created essentially in a first axial plane of the guide whereas the radial deformations created in a second axial plane of the guide perpendicular to the first axial plane are substantially equal to zero.

    Abstract translation: 使用导波的液面检测器包括位于液体外部的第一传感器,用于发送入射弹性脉冲,该入射弹性脉冲在其下部浸入液体的细长引导件中传播,第二换能器位于液体外部并接收 由第一换能器发送并由引导件传送的弹性脉冲以及用于测量由第一换能器传播入射弹性脉冲之间的时间和由第二换能器随后接收相同弹性波的时间的电子电路。 细长引导件包括至少一个在纵向方向上没有粗糙度的光滑管,第二传感器位于靠近第一传感器的固定位置,以便在第一传感器的表面上接收由第一传感器反射之后传递的弹性脉冲 其中浸入引导件的下部的液体,并且第一换能器以相对于引导件的方式布置,所述管的周期性径向变形基本上在引导件的第一轴向平面中反对称地产生,而径向 在垂直于第一轴向平面的引导件的第二轴向平面中产生的变形基本上等于零。

    Marking system using elastic surface waves
    3.
    发明授权
    Marking system using elastic surface waves 失效
    使用弹性表面波的标记系统

    公开(公告)号:US4393268A

    公开(公告)日:1983-07-12

    申请号:US265325

    申请日:1981-05-19

    CPC classification number: G06F3/0433 G01B17/00 G01D5/48

    Abstract: The invention relates to data acquisition devices making it possible, by the use of elastic surface waves, to mark the coordinates of a stylus (7) making a line on the surface (2) of a piezoelectric plate (1).The invention relates to a device in which the measuring surface (2) is provided with roughnesses or unevennesses of negligible size compared with the wavelength of the surface waves. The stylus (7) also comprises a member (8) for supplying a marking substance (10).The invention is more particularly applicable to the remote transmission of graphic symbols and to the processing of digital data representing such symbols.

    Abstract translation: 本发明涉及数据采集装置,其可以通过使用弹性表面波来标记在压电板(1)的表面(2)上形成线的触控笔(7)的坐标。 本发明涉及一种装置,其中测量表面(2)具有与表面波的波长相比尺寸可忽略的粗糙度或不均匀性。 触针(7)还包括用于供应标记物质(10)的构件(8)。 本发明更特别适用于图形符号的远程传输和表示这种符号的数字数据的处理。

    Optical-pickup coordinatometer
    4.
    发明授权
    Optical-pickup coordinatometer 失效
    光拾取坐标仪

    公开(公告)号:US4272676A

    公开(公告)日:1981-06-09

    申请号:US93137

    申请日:1979-11-09

    CPC classification number: G06F3/043 G06F3/03545 G06F3/042

    Abstract: An optical pickup which performs the function of a light pen is capable of point detection of elastic waves propagated by electrochemical transducers in a direction parallel to the surface of a writing table. The table is constituted by a plate of refractive material placed within an optical polarizing cell which prevents emergence of incident radiation produced by a light source. The pickup receives that portion of the radiation which emerges from the cell by virtue of the birefringence induced within the plate by the elastic wave trains issuing from the transducers.

    Abstract translation: 执行光笔功能的光学拾取器能够在平行于书写台的表面的方向上点检测由电化学换能器传播的弹性波。 该表由放置在光学偏振元件内的折射材料板构成,其防止由光源产生的入射辐射的出射。 拾取器由于通过从换能器发出的弹性波列而在板内引起的双折射而接收从电池出射的那部分辐射。

    SYSTEM AND METHOD FOR HIGH RESOLUTION SENSING OF CAPACITANCE OR OTHER REACTIVE IMPEDANCE CHANGE IN A LARGE DYNAMIC RANGE
    6.
    发明申请
    SYSTEM AND METHOD FOR HIGH RESOLUTION SENSING OF CAPACITANCE OR OTHER REACTIVE IMPEDANCE CHANGE IN A LARGE DYNAMIC RANGE 有权
    大动态范围内高分辨率感测电容或其他反应性阻抗变化的系统及方法

    公开(公告)号:US20090033340A1

    公开(公告)日:2009-02-05

    申请号:US11949462

    申请日:2007-12-03

    CPC classification number: G01R27/26

    Abstract: Systems and methods are provided for sensing or measuring capacitive or inductive reactance or changes in reactance in which the sensed reactance is coupled with a known resistance in a sensor circuit and a start signal is provided to the sensor circuit, and a programmable delay line is used to generate a programmable delay signal. The outputs of the programmable delay and the sensor circuits are compared to ascertain which transitions first, and the programmable delay value is adjusted in successive approximation fashion to identify a programmable delay that best represents the delay time of the sensor circuit from which the sensed reactance value can be determined.

    Abstract translation: 提供的系统和方法用于感测或测量电感或电抗或电抗变化,其中所感测的电抗与传感器电路中的已知电阻耦合,并且将启动信号提供给传感器电路,并且使用可编程延迟线 以产生可编程延迟信号。 将可编程延迟和传感器电路的输出进行比较,以确定首先进行哪些转换,并且以逐次近似的方式调整可编程延迟值,以识别最佳表示传感器电路的延迟时间的可编程延迟, 可以确定。

    Liquid presence detector having a composite waveguide for acoustic waves
    7.
    发明授权
    Liquid presence detector having a composite waveguide for acoustic waves 失效
    液体存在检测器具有用于声波的复合波形

    公开(公告)号:US5099454A

    公开(公告)日:1992-03-24

    申请号:US555302

    申请日:1990-07-19

    CPC classification number: G01F23/2965 G01F23/2961 Y10S367/908

    Abstract: The detector for detecting the presence of a liquid comprises: a) a metal veguide having a solid cylindrical top first portion of relatively small section with an outside diameter having a first value d1, which first portion is fixed on a support, a cylindrical rigid bottom second portion whose outside diameter has a second value d2 greater than the first value d1, which second portion extends the first portion downwards and is connected thereto by a short linking portion; b) transducer means disposed in the vicinity of the top portion of the waveguide; and c) electronic processing means. The value of the frequency at which the transducer means are excited is selected in such a manner that acoustic wave trains propagate in the cylindrical first portion at the group velocity of low frequency waves, and propagate in the cylindrical second portion at the minimum group velocity corresponding to the point of inflection in the curve of phase velocity as a function of frequency.

    Abstract translation: 用于检测液体存在的检测器包括:a)金属波导,其具有相对较小截面的实心圆柱形顶部第一部分,外径具有第一值d1,第一部分固定在支撑件上,圆柱形刚性底部 第二部分的外径具有大于第一值d1的第二值d2,第二部分向下延伸第一部分并通过短连接部分连接到第二部分; b)设置在波导顶部附近的换能器装置; 和c)电子处理装置。 选择换能器装置被激励的频率值,使得声波串以低频波群的速度在圆柱形第一部分中传播,并以对应的最小组速度在圆柱形第二部分中传播 到相位速度曲线中的拐点作为频率的函数。

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