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21. 发明授权

US5065093A Inductive proximity sensor for detecting an object starting electrical conductivity 失效
标题翻译：用于检测物体启动电导率的感应近似传感器
公开(公告)号：US5065093A
公开(公告)日：1991-11-12
申请号：US235103
申请日：1988-08-23
申请人： Hendrikus C. Nauta , Ernst H. Nordholt
发明人： Hendrikus C. Nauta , Ernst H. Nordholt
IPC分类号： G01B7/00 , G01B7/14 , G01V3/10
CPC分类号： G01V3/102
摘要： Inductive proximity sensor for detecting an object having electrical conductivity comprising a sensor housing, a measuring coil and reference coil placed on either side of a plane of symmetry through the sensor housing. Each coil is partly surrounded by a piece of magnetic material which leaves the measuring coil or reference coil respectively free at the front which faces the direction of the object to be detected or a reference member. An electronic circuit is provided for supplying both coils with an AC signal and for measuring the change in a specific property of the measuring coil with respect to that of the reference coil when object approaches and determining therefrom the distance or the presence of the object. The pieces of magnetic material around the two coils are formed essentially from the same homogeneous material forming a block. Means are provided in the sensor housing for screening magnetic fields produced by both coils in order to suppress thereby mutual crosstalk. The electronic circuit for each coil has a separate synchronous detector with its own oscillator for effecting a frequency-selective measurement such that the effect of changes in the properties of the magnetic material and of the measuring coil on the detection distance is compensated for electronically. Both oscillators of the synchronous detectors have a frequency offset from each other.

22. 发明授权

US4652864A Microwave proximity sensor 失效
标题翻译：微波接近传感器
公开(公告)号：US4652864A
公开(公告)日：1987-03-24
申请号：US401925
申请日：1982-07-26
申请人： Noel M. Calvin
发明人： Noel M. Calvin
IPC分类号： G01V3/10 , G08B13/24 , G08B13/18
CPC分类号： G01V3/102 , G08B13/2491
摘要： Microwave oscillator means wherein the resonant frequency determining element is a 1/2 or 1/4-wavelength folded dipole antenna that also serves as the transmitting and receiving antenna, capacitor means that is alternately charged and then discharged through said oscillator means until the voltage drops so low that oscillation ceases at which point the capacitor is charged again, negative peak follower means to convert the minimum voltage across the capacitor into a DC voltage, and comparator means to detect changes in the output voltage of the peak follower caused by the approach of a person or object to the 1/2 or 1/4-wavelength antenna.
摘要翻译：微波振荡器装置，其中谐振频率确定元件是也用作发射和接收天线的1/2或1/4波长折叠偶极天线，电容器装置被交替地充电，然后通过所述振荡器装置放电直到电压下降如此低的振荡停止，电容器再次充电，负峰值随动器将电容器两端的最小电压转换为直流电压，比较器意味着检测由于接近引脚引起的峰值跟随器的输出电压的变化一个人或物体到1/2或1/4波长天线。

23. 发明授权

US4543527A Proximity switch exhibiting improved start-up characteristics 失效
标题翻译：具有改善启动特性的接近开关
公开(公告)号：US4543527A
公开(公告)日：1985-09-24
申请号：US367493
申请日：1982-04-12
申请人： Russell P. Schuchmann , Donald L. Van Zeeland
发明人： Russell P. Schuchmann , Donald L. Van Zeeland
IPC分类号： G01V3/10 , G01B7/14 , H03B5/00
CPC分类号： G01V3/102
摘要： A new and improved method and apparatus is disclosed for detecting a target location with respect to an inductive tank circuit. A sensing field such as an electromagnetic field is established having an amplitude which changes in value due to the presence of a target in the sensing field. A first energy level is provided to maintain the field at an amplitude. A second energy level is provided to achieve a value for the field within the predetermined amount of time after initiation of the field.
摘要翻译：公开了一种新的和改进的方法和装置，用于检测相对于感应箱电路的目标位置。建立了诸如电磁场的感测场，其具有由于感测场中的目标的存在而导致值的变化的幅度。提供第一能量水平以将场保持在振幅。提供第二能量水平以在场开始之后的预定时间量内实现该场的值。

24. 发明授权

US4536713A Electrical resistivity measurement of a flowing drilling fluid using eddy currents generated therein 失效
标题翻译：使用其中产生的涡流的流动钻井液的电阻率测量
公开(公告)号：US4536713A
公开(公告)日：1985-08-20
申请号：US471879
申请日：1983-03-03
申请人： Mark H. Davis , Richard A. Meador , Macmillan M. Wisler
发明人： Mark H. Davis , Richard A. Meador , Macmillan M. Wisler
IPC分类号： E21B49/00 , G01N27/02 , G01N27/74 , G01V3/10 , G01V3/26
CPC分类号： E21B49/005 , G01N27/023 , G01N27/74 , G01V3/102
摘要： A high permeability ferrite core, which includes a gap between adjacent ends thereof, is combined with a magnetic coil encircling the core, and is located in a sub positioned in the drill string just above the drill bit of a borehole drilling rig. The core is positioned so that the gap thereof lies across a recess region formed in the outer wall of the sub. Drilling fluids flow along the outer surface of the sub on the return path from the drill bit to the mud pits located at the surface of the borehole. A constant current, or voltage, at a frequency within the range of 20 KHz-20 MHz is applied to the terminals of the coil encircling the core and the eddy currents developed in the gap region produce a measurable back emf at the coil terminals. The current produced by this emf voltage is indicative of the resistivity of the drilling fluid within the recess region in the wall of the sub and the fluctuations of the voltage accurately follow the variations in drilling fluid resistivity.
摘要翻译：包括其相邻端之间的间隙的高磁导率铁氧体磁芯与环绕磁芯的磁性线圈组合，并且位于位于钻孔钻柱的位于钻孔钻机的钻头上方的钻柱中的子系统中。芯部定位成使得其间隙跨越形成在子的外壁中的凹部区域。钻井液体沿着从钻头返回路径的子表面流到位于钻孔表面的泥浆坑。在20KHz-20MHz的频率范围内的恒定电流或电压被施加到环绕磁芯的线圈的端子上，并且在间隙区域中产生的涡流在线圈端子处产生可测量的反电动势。由该电动势电压产生的电流表示在子壁的凹陷区域内的钻井流体的电阻率，并且电压的波动准确地跟随钻井液电阻率的变化。

25. 发明授权

US4527122A Bore hole direction measuring instrument control 失效
标题翻译：钻孔方向测量仪控制
公开(公告)号：US4527122A
公开(公告)日：1985-07-02
申请号：US387598
申请日：1982-06-11
申请人： Lawrence A. Pyatt , Robert W. Thompson
发明人： Lawrence A. Pyatt , Robert W. Thompson
IPC分类号： E21B47/00 , E21B47/09 , G01D9/42 , G01N27/72 , G01V3/10 , G01N27/82 , G01R33/00 , G03B37/00
CPC分类号： G01V3/102 , E21B47/0002 , E21B47/0905 , G01D9/42 , G01N27/72
摘要： A combination of magnetics and a special geometric environment is employed to distinguish whether an instrument is positioned within a pipe formed of magnetizable or non-magnetizable material, and is the basis, in part, for a method and an apparatus used in controlling picture taking at the bottom of a well bore. A coil is energized repetitively in a circuit in which the voltage across the coil, or the current that flows through the coil, can be measured. Whether the coil is in a magnetic or non-magnetic environment is determined by the magnitude of the change in coil voltage or current.
摘要翻译：使用磁性和特殊几何环境的组合来区分仪器是否位于由可磁化或不可磁化的材料形成的管道内，并且部分地基于用于控制图像拍摄的方法和装置的基础井的底部。线圈在其中可以测量线圈上的电压或流过线圈的电流的电路中重复地通电。线圈是否处于磁性或非磁性环境中是由线圈电压或电流变化的大小决定的。

26. 发明授权

US4365197A Identification of pipe material in wells 失效
标题翻译：井中管材鉴别
公开(公告)号：US4365197A
公开(公告)日：1982-12-21
申请号：US119171
申请日：1980-02-06
申请人： Lawrence A. Pyatt , Robert W. Thompson
发明人： Lawrence A. Pyatt , Robert W. Thompson
IPC分类号： E21B47/00 , E21B47/09 , G01D9/42 , G01N27/72 , G01V3/10 , G01N27/82
CPC分类号： G01D9/42 , E21B47/0002 , E21B47/0905 , G01N27/72 , G01V3/102
摘要： A combination of magnetics and a special geometric environment is employed to distinguish whether an instrument is positioned within a pipe formed of magnetizable or non-magnetizable material, and is the basis, in part, for a method and an apparatus used in controlling picture taking at the bottom of a well bore. A coil is energized repetitively in a circuit in which the voltage across the coil, or the current that flows through the coil, can be measured. Whether the coil is in a magnetic or non-magnetic environment is determined by the magnitude of the change in coil voltage or current.
摘要翻译：使用磁性和特殊几何环境的组合来区分仪器是否位于由可磁化或不可磁化的材料形成的管道内，并且部分地基于用于控制图像拍摄的方法和装置的基础井的底部。线圈在其中可以测量线圈上的电压或流过线圈的电流的电路中重复地通电。线圈是否处于磁性或非磁性环境中是由线圈电压或电流变化的大小决定的。

27. 发明授权

US4059795A Digital eddy current apparatus for sensing and analyzing metallurgical characteristics of an electrically conductive material 失效
标题翻译：用于感测和分析导电材料的冶金特性的数字涡流装置
公开(公告)号：US4059795A
公开(公告)日：1977-11-22
申请号：US692481
申请日：1976-06-03
申请人： George Mordwinkin
发明人： George Mordwinkin
IPC分类号： G01R19/25 , G01N27/72 , G01N27/82 , G01N27/90 , G01N33/20 , G01R27/26 , G01V3/10 , G01R33/12
CPC分类号： G01N27/82 , G01N27/9046 , G01V3/102
摘要： A digital eddy current apparatus for sensing and analyzing metallurgical characteristics of an electrically conductive material. A square wave is supplied to a resonating circuit which includes a coil used as a sensing element for the conductive material. The resonating circuit produces a sinusoidal wave which is converted into a rectangular pulse which, when the resonating means is at resonance condition if superimposed upon the square wave pulse it would be positioned in the center of one-half of the square wave. The width of the rectangular pulse is a direct function of the amplitude of the sinusoidal wave and phase shift of the sinusoidal waveform is detected by movement of the rectangular pulse from the center position within the square wave. The width and position of the rectangular pulse is a direct function of the metallurgical characteristics of the conductive material.
摘要翻译：一种用于感测和分析导电材料的冶金特性的数字涡流装置。方波被提供给包括用作导电材料的感测元件的线圈的谐振电路。谐振电路产生正弦波，其转换成矩形脉冲，当谐振装置处于共振状态时，如果叠加在方波脉冲上，则它将被定位在方波的一半的中心。矩形脉冲的宽度是正弦波的振幅的直接函数，并且通过矩形脉冲从方波中的中心位置的移动来检测正弦波形的相移。矩形脉冲的宽度和位置是导电材料的冶金特性的直接函数。

28. 发明授权

US4042876A Eddy current gauge for monitoring displacement using printed circuit coil 失效
标题翻译：用于使用印刷电路线圈监测位移的涡流电流表
公开(公告)号：US4042876A
公开(公告)日：1977-08-16
申请号：US681644
申请日：1976-04-29
申请人： Armando J. Visioli, Jr.
发明人： Armando J. Visioli, Jr.
IPC分类号： G01D5/20 , G01V3/10 , G01R33/12
CPC分类号： G01D5/202 , G01V3/102
摘要： A proximity detection system for non-contact displacement and proximity measurement of static or dynamic metallic or conductive surfaces is provided wherein the measurement is obtained by monitoring the change in impedance of a flat, generally spiral-wound, printed circuit coil which is excited by a constant current, constant frequency source. The change in impedance, which is detected as a corresponding change in voltage across the coil, is related to the eddy current losses in the distant conductive material target. The arrangement provides for considerable linear displacement range with increased accuracies, stability, and sensitivity over the entire range.
摘要翻译：提供了一种用于静态或动态金属或导电表面的非接触位移和接近度测量的接近检测系统，其中通过监测由平滑的，大致螺旋缠绕的印刷电路线圈的阻抗的变化获得测量值，恒流恒流源。被检测为线圈两端的电压的相应变化的阻抗变化与远距离导电材料靶中的涡流损耗有关。该布置提供了相当大的线性位移范围，在整个范围内具有提高的精度，稳定性和灵敏度。

29. 发明授权

US3896371A Metal detector with a resonating circuit being driven by a frequency higher than its natural resonance frequency 失效
标题翻译：具有由高于其自然共振频率的频率驱动的谐振电路的金属探测器
公开(公告)号：US3896371A
公开(公告)日：1975-07-22
申请号：US42552073
申请日：1973-12-17
申请人： HAMETTA ALLEN W
发明人： HAMETTA ALLEN W
IPC分类号： G01V3/10
CPC分类号： G01V3/102
摘要： Concealed metal objects such as coins are detected by a metal detector including a novel discriminating circuit which discriminates between coins and unwanted metal objects such as ferrous and non-ferrous pull tabs from pop and beer cans. The discriminating circuit includes an L/C circuit which is forced to resonate at a frequency significantly higher than its natural resonance frequency. This L/C circuit is adapted to provide an output signal having different amplitudes depending on the type of metal object which is in the proximity of the L/C circuit. The L/C circuit is physically located in a sensing head or probe which the searcher moves over a given search area. When the probe is proximate a metal object, this object alters the resonance characteristics of the L/C circuit and the amplitude of the output signal from the L/C circuit. As the probe moves towards metal objects such as pennies, the amplitude of the output signal increases. As the probe moves towards other types of metal objects such as pull tabs, the amplitude of the output signal remains about the same or diminishes slightly. This discernible difference in amplitudes produced by the different types of metal objects is attainable because the L/C circuit is forced to resonate at a frequency which is different and, for most metal objects, is higher than its natural resonance frequency. Because coins have a different discernible effect on the resonance characteristics of the L/C circuit than unwanted metal objects such as pull tabs, coins can be distinguished from pull tabs. In the preferred embodiment of my detector the increase in amplitude of the output signal due to the proximity of the coin is used to activate a signal generator which provides audio and visual signals indicating the presence of a coin. The signal generator is not activated in the presence of the pull tabs. The metal detector is, however, adapted to operate in two modes. One mode distinguishes between pull tabs and coins as described above. The other mode does not distinguish between coins and pull tabs, but will distinguish between coins and bottle caps, metal foil and other ferrous junk. Depending on the prevalence of pull tabs in a given search area, one mode may be preferable to the other mode.

30. 发明授权

US3764223A Method for locating and removing manhole covers 失效
标题翻译：用于定位和拆卸人造屋的方法
公开(公告)号：US3764223A
公开(公告)日：1973-10-09
申请号：US3764223D
申请日：1971-02-18
申请人： LEE WAY TRENCHING INC
发明人： WEEKLY G , LUCERO F , LUCERO J
IPC分类号： E01C23/09 , E01C23/14 , E02D29/14 , G01V3/10
CPC分类号： G01V3/102 , E01C23/0953 , E01C23/14 , E02D29/14
摘要： The presence of a manhole cover in a roadbed under a layer of non-magnetic asphalt is detected and accurately located by a method in which magnetic detection apparatus have a detection alarm and employing inductive search coils is operative to sense the proximity of a metallic object, at least portions of which are magnetically detectable, through changes in coil inductance. The detectiom method and apparatus is capable of determining the thickness of the asphalt layer and heat is employed to efficiently melt through the asphalt in such a way as to permit removal of the cover without unnecessarily damaging the asphalt surface. Thereafter, the cover may be replaced in the road bed and resealed in place.
摘要翻译：通过磁检测装置具有检测报警的方法检测并精确地定位在非磁性沥青层下的路基中的人孔盖的存在，并且采用感应检索线圈可操作以感测金属物体的接近度，通过线圈电感的变化，其至少部分是磁性可检测的。检测方法和装置能够确定沥青层的厚度，并且使用热量以有效地熔化通过沥青，以便允许移除盖而不会不必要地损坏沥青表面。此后，盖子可以在路床上更换并重新密封到位。

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