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    • 4. 发明授权
    • Method and apparatus for measuring the distance between a body and a
capacitance probe
    • 用于测量身体和电容探针之间的距离的方法和装置
    • US5021740A
    • 1991-06-04
    • US320315
    • 1989-03-07
    • Dennis P. SarrPatrick L. Anderson
    • Dennis P. SarrPatrick L. Anderson
    • G01B7/02G01B7/287G01R27/26
    • G01R27/2605G01B7/023G01B7/287
    • A distance-measuring apparatus for measuring the distance between a capacitance-type sensing probe (60) and a nearby surface of a conductive body is provided. A probe (60) includes a plurality of measuring electrodes (56.sub.l -56.sub.n) and a grounding electrode (58). The grounding electrode protrudes from the probe and grounds the nearby surface of the conductive body. A control system (10) is connected to the probe (60). A processor (12) issues control instructions, S.sub.CTL, to a selector (16). The selector (16) selects one of a plurality of measuring electrodes (56.sub.l -56.sub.n) and connects the selected electrode to a converter (14). A charging circuit (18) applies a charging voltage to the selected electrode, causing a capacitor formed by the selected electrode and the nearby surface of the conductive body to charge up. A timing circuit (22) starts a counter (32) when one of the measuring electrodes (56.sub.l -56.sub.n) is selected and stops the counter (32) when a capacitor charge voltage, V".sub.C, becomes greater than or equal to a threshold voltage, V.sub.T. The counter (32) counts clock pulses, V.sub.CK, produced by a clock (34) and produces a count value, S.sub.CNT, that is proportional to the charge time of the capacitor. The processor (12) translates the S.sub.CNT value into a distance value corresponding to the distance between the sensing probe (60) and the nearby surface of the body being inspected.
    • 提供了用于测量电容式感测探头(60)和导电体的附近表面之间的距离的距离测量装置。 探针(60)包括多个测量电极(561-56n)和接地电极(58)。 接地电极从探头突出并接地导电体的附近表面。 控制系统(10)连接到探头(60)。 处理器(12)将控制指令SCTL发布到选择器(16)。 选择器(16)选择多个测量电极(56l-56n)中的一个并将所选择的电极连接到转换器(14)。 充电电路(18)对所选择的电极施加充电电压,使由所选择的电极和导电体的附近表面形成的电容器充电。 定时电路(22)当选择了测量电极(561-56n)之一时启动计数器(32),并且当电容器充电电压V''C变得大于或等于 阈值电压VT。 计数器(32)计算由时钟(34)产生的时钟脉冲VCK,并产生与电容器的充电时间成比例的计数值SCNT。 处理器(12)将SCNT值转换成对应于感测探头(60)和待检查物体的附近表面之间的距离的距离值。
    • 7. 发明授权
    • Portable paint thickness gauge for composite materials using resonant cavities at x-band
    • 便携式涂料厚度计,用于复合材料,在x带使用谐振腔
    • US06184694B2
    • 2001-02-06
    • US09135475
    • 1998-08-17
    • Patrick L. AndersonChrister E. BjorkegrenLori E. Kovarik (Forner)Bruce S. Howard
    • Patrick L. AndersonChrister E. BjorkegrenLori E. Kovarik (Forner)Bruce S. Howard
    • G01R2704
    • G01B15/02
    • A measuring instrument and method for measuring paint and coating thickness on conductive and poorly conductive substrates. The instrument uses a microwave amplifier, a measurement cavity, and a reference cavity with supporting electronics to measure the apparent changes in the length of the measurement cavity due to the changes in the paint and coating thickness. The measurement cavity resonates when the measurement cavity is set upon the test surface. The oscillating signal is sent through a reference cavity tuned to give the desired filtered response to cover the paint and coating thickness range allowed. The filtered response of the reference cavity is converted to a dc level signal that serves as input to a data acquisition circuit. The data acquisition circuit converts the input signal to digital form so that the calibration method may be used to associate a given response with the corresponding paint and coating thickness.
    • 用于测量导电和导电性差的基板上的涂料和涂层厚度的测量仪器和方法。 仪器使用微波放大器,测量腔和带有支持电子元件的参考腔,以测量由于涂料和涂层厚度的变化引起的测量腔长度的明显变化。 当测量腔设置在测试表面上时,测量腔谐振。 振荡信号通过调谐的参考空腔发送,以提供所需的滤波响应以覆盖所允许的涂料和涂层厚度范围。 将参考空腔的滤波后的响应转换为用作数据采集电路的输入的直流电平信号。 数据采集​​电路将输入信号转换为数字形式,使得校准方法可用于将给定响应与相应的涂料和涂层厚度相关联。
    • 10. 发明授权
    • Probe for inspecting countersunk holes in conductive bodies
    • US4996492A
    • 1991-02-26
    • US320314
    • 1989-03-07
    • Patrick L. AndersonDennis P. SarrMark B. Simpson
    • Patrick L. AndersonDennis P. SarrMark B. Simpson
    • G01B7/13G01B7/28
    • G01B7/282G01B7/13G01B7/28
    • A probe (20) that inspects a countersunk hole (21) in a conductive body, such as an aircraft part (22), is provided. A plurality of nested cylinders form an electrode cartridge (54) with a countersink portion (74) having a frustoconical shape and a hole portion (76) having a cylindrical shape. A plurality of lower hole electrode strips (72) are mounted on a lower hole cylinder (110) and a plurality of upper hole electrode strips (70) are mounted on an upper hole cylinder (116). A plurality of lower countersink electrode strips (68) are coupled to a lower countersink cylinder (124) and a plurality of upper countersink electrode strips (66) are coupled to an upper countersink cylinder (132). A dielectric layer (64) covers a plurality of measuring electrode tips (67, 69, 71 and 73) and an outer surface (150) of the hole and countersink portions (76 and 74). A grounding electrode (158) is mounted on the upper hole cylinder ( 116). A ground wire (162) is coupled to the grounding electrode (158) and extends beyond the dielectric layer (64). When probe (20) is inserted into the countersunk hole (21), the countersunk hole (21) is grounded by the ground wire (162). A charging current applied to the measuring electrode strips (66, 68, 70 and 72) in a sequential manner, causes the measuring electrode tips (67, 69, 71 and 73) form fringe field capacitors with the ground wall of the countersunk hole (21). The fringe field capacitors charge up at a rate dependent, in part, upon the distance between the probe (20) and the wall of the countersunk hole (21). Sufficient rate measurements are made of the distance between the probe (20) and the wall of the countersunk hole (20) to permit another device (30) to determine whether the geometry and orientation of the countersunk hole (21) are within engineering specifications.