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公开(公告)号：EP0288927A2
公开(公告)日：1988-11-02
申请号：EP88106496.8
申请日：1988-04-22
发明人： McGregor, Douglas D.
IPC分类号： G01R33/26
CPC分类号： G01R33/26
摘要： A helium magnetometer includes a helium cell (1) containing helium, preferable ⁴ He . A solid state laser (4) strikes the helium cell at one end with a laser having a wave length of 1082.91 nm in the embodiment of a ⁴ He cell. The helium atoms precess at known frequencies for different magnetic fields. The transparency of the helium cell at 1082.91 nm with ⁴ He is a function of the resonance of the atoms within the helium cell. A radiation detector (9) positioned on a second end of the helium cell opposite the end where the laser strikes detects the laser when transmitted through the helium cell and produces an electrical signal in response to the transmitted laser. The resonance of the helium cell is enhanced by a Voltage Controlled Oscillator, VCO (19), which provides a variable output frequency to a pair of coils (8, 12) positioned on the sides of the helium cell and electrically connected to the VCO to receive the variable output frequency. The pair of coils produces a variable magnetic field at the precession frequency that is mathematically related to the magnetic field that is being measured and thus enhances the precession of th atoms within the helium cell. A feedback loop (9, 11, 13, 15) includes a demodulation circuit (13, 15) that is electrically connected between the radiation detector and the VCO and demodulates the electrical signal from the radiation detector to produce a drive voltage for driving the VCO.
摘要翻译： 氦磁力仪包括含有氦的氦细胞（1），优选的是氦。 在4 He电池的实施例中，固态激光器（4）在一端用具有1082.91nm波长的激光器在一端撞击氦电池。 氦原子在不同磁场的已知频率下进行。 氦气在1082.91nm处的透明度与He的关系是氦气中原子的共振的函数。 位于氦气池第二端的辐射探测器（9）位于与激光射击的端部相对的位置，当透过氦气池传输时检测激光，并产生响应于发射的激光器的电信号。 通过压控振荡器VCO（19）来增强氦气池的共振，该压控振荡器（19）向位于氦气池侧面的一对线圈（8,12）提供可变的输出频率，并电连接到VCO 接收可变输出频率。 一对线圈在与被测量的磁场有数学关系的进动频率处产生可变磁场，从而增强了氦气细胞内th原子的进动。 反馈回路（9,11,13,15）包括解调电路（13,15），其被电连接在辐射检测器和VCO之间，并且解调来自辐射检测器的电信号以产生用于驱动VCO的驱动电压 。
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公开(公告)号：EP0140535A2
公开(公告)日：1985-05-08
申请号：EP84305946.0
申请日：1984-08-30
发明人： McGregor, Douglas D.
IPC分类号： G01R33/26
摘要： @ An apparatus for measuring the magnitude of a magnetic field in one embodiment includes a 3 He cell 16 having an oscillator 18 connected thereto for producing an electrical discharge for metastable 3 He atoms, a "He lamp 22 having a lamp oscillator 26 connected thereto for producing 4 He radiation and an optical path to the 3 He cell including a lens 28 for collimating the 4 He radiation and a circular polarizer 30. The imaged 3 He atoms and 4 He radiation interact to magnetize a portion of the 3 He atoms in a direction parallel to the direction of the ambient magnetic field. After the cell magnetization, an oscillatory magnetic field normal to the ambient field is established by coils 32 and 34 connected to a frequency synthesizer 42 which is scanned over a frequency interval including the free precession (Larmor) frequency. This action rotates the direction of magnetization of the 3 He cell atoms from parallel to the ambient magnetic field to approximately perpendicular to the ambient magnetic field. The cell 16 then is allowed to precess freely and an a.c. is induced in a pick up coil 44 during precession. The a.c. is connected to a frequency discriminator 50 which may be a digital type to digitize the voltage representative of the frequency of the a.c.. A very narrow band digital filter 54 filters the digitized output of the discriminator 50 and a digital to analog converter 56 produces a voltage from the digital filter output for a charge recorder 58 for charting.
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公开(公告)号：EP0288927A3
公开(公告)日：1989-05-24
申请号：EP88106496.8
申请日：1988-04-22
发明人： McGregor, Douglas D.
IPC分类号： G01R33/26
CPC分类号： G01R33/26
摘要： A helium magnetometer includes a helium cell (1) containing helium, preferable ⁴ He . A solid state laser (4) strikes the helium cell at one end with a laser having a wave length of 1082.91 nm in the embodiment of a ⁴ He cell. The helium atoms precess at known frequencies for different magnetic fields. The transparency of the helium cell at 1082.91 nm with ⁴ He is a function of the resonance of the atoms within the helium cell. A radiation detector (9) positioned on a second end of the helium cell opposite the end where the laser strikes detects the laser when transmitted through the helium cell and produces an electrical signal in response to the transmitted laser. The resonance of the helium cell is enhanced by a Voltage Controlled Oscillator, VCO (19), which provides a variable output frequency to a pair of coils (8, 12) positioned on the sides of the helium cell and electrically connected to the VCO to receive the variable output frequency. The pair of coils produces a variable magnetic field at the precession frequency that is mathematically related to the magnetic field that is being measured and thus enhances the precession of th atoms within the helium cell. A feedback loop (9, 11, 13, 15) includes a demodulation circuit (13, 15) that is electrically connected between the radiation detector and the VCO and demodulates the electrical signal from the radiation detector to produce a drive voltage for driving the VCO.
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公开(公告)号：EP0224986A2
公开(公告)日：1987-06-10
申请号：EP86305992.9
申请日：1986-08-04
摘要： A smart mine 10 includes a pair of He³ magnetic sensors 12 and 14 exteriorly connected to a head compartment 20 of a mine housing 22. A torpedo compartment for housing a torpedo 26 completes the mine housing 22. The head compartment 20 contains the sensor support electronics which includes a phase locked loop means having a pair of digital phase locked loops connected between the sensors and a difference circuit whereby a difference signal representative of the difference between the pair of He³ magnetic sensors 12 and 14 is produced for processing in a signal processor for determining the presence of large ferromagnetic bodies and producing a torpedo firing signal.
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公开(公告)号：EP0224986B1
公开(公告)日：1993-03-31
申请号：EP86305992.9
申请日：1986-08-04
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公开(公告)号：EP0471586A1
公开(公告)日：1992-02-19
申请号：EP91307576.8
申请日：1991-08-16
IPC分类号： G01R33/26
CPC分类号： G01R33/26
摘要： A magnetometer having an enclosed cell (19) containing He³ therein for receiving light from a light source (5), a light source (3, 5, 11, 15) for directing light to the enclosed cell (19) along a predetermined path, a single pick-up coil containing therein the light source and the enclosed cell (1a), s solenoid containing the pick-up coil therein and a data collection system coupled to the pick-up coil. The light source is a source of circularly polarized light and can comprise a He⁴ cell and an optical system and a circular polarizer disposed serially between He⁴ cell and enclosed cell containing He³. The predetermined path of the light source, the enclosed cell and the pick-up coil are disposed along the axis of the solenoid. The light source can also be a laser.
摘要翻译： 具有在其中包含He <3>的封闭电池（19）的磁力计用于接收来自光源（5）的光;光源（3,5,11,15），用于将光引导到封闭电池（19）沿着 预定路径，其中包含光源和封闭单元（1a）的单个拾取线圈，其中包含拾取线圈的螺线管和耦合到拾取线圈的数据收集系统。 光源是圆偏振光的源，并且可以包括He 4单元和串联地设置在He 4单元和含有He 3的封闭单元之间的光学系统和圆偏振器。 沿着螺线管的轴线设置光源，封闭单元和拾取线圈的预定路径。 光源也可以是激光。
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公开(公告)号：EP0224986A3
公开(公告)日：1990-03-21
申请号：EP86305992.9
申请日：1986-08-04
摘要： A smart mine 10 includes a pair of He³ magnetic sensors 12 and 14 exteriorly connected to a head compartment 20 of a mine housing 22. A torpedo compartment for housing a torpedo 26 completes the mine housing 22. The head compartment 20 contains the sensor support electronics which includes a phase locked loop means having a pair of digital phase locked loops connected between the sensors and a difference circuit whereby a difference signal representative of the difference between the pair of He³ magnetic sensors 12 and 14 is produced for processing in a signal processor for determining the presence of large ferromagnetic bodies and producing a torpedo firing signal.
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公开(公告)号：EP0140535B1
公开(公告)日：1990-03-21
申请号：EP84305946.0
申请日：1984-08-30
发明人： McGregor, Douglas D.
IPC分类号： G01R33/26
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公开(公告)号：EP0140535A3
公开(公告)日：1986-10-01
申请号：EP84305946
申请日：1984-08-30
发明人： McGregor, Douglas D.
IPC分类号： G01R33/26
摘要： @ An apparatus for measuring the magnitude of a magnetic field in one embodiment includes a 3 He cell 16 having an oscillator 18 connected thereto for producing an electrical discharge for metastable 3 He atoms, a "He lamp 22 having a lamp oscillator 26 connected thereto for producing 4 He radiation and an optical path to the 3 He cell including a lens 28 for collimating the 4 He radiation and a circular polarizer 30. The imaged 3 He atoms and 4 He radiation interact to magnetize a portion of the 3 He atoms in a direction parallel to the direction of the ambient magnetic field. After the cell magnetization, an oscillatory magnetic field normal to the ambient field is established by coils 32 and 34 connected to a frequency synthesizer 42 which is scanned over a frequency interval including the free precession (Larmor) frequency. This action rotates the direction of magnetization of the 3 He cell atoms from parallel to the ambient magnetic field to approximately perpendicular to the ambient magnetic field. The cell 16 then is allowed to precess freely and an a.c. is induced in a pick up coil 44 during precession. The a.c. is connected to a frequency discriminator 50 which may be a digital type to digitize the voltage representative of the frequency of the a.c.. A very narrow band digital filter 54 filters the digitized output of the discriminator 50 and a digital to analog converter 56 produces a voltage from the digital filter output for a charge recorder 58 for charting.
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