公开(公告)号：US4703273A

公开(公告)日：1987-10-27

申请号：US759783

申请日：1985-07-29

申请人： William F. Kolbe ,  Branko Leskovar

发明人： William F. Kolbe ,  Branko Leskovar

IPC分类号： G01N22/00 ,  G01R33/60 ,  G01N27/78

CPC分类号： G01R33/60 ,  G01N22/00

摘要： A high frequency energy pulsing system suitable for use in a pulsed microwave spectrometer (10), including means (11, 19) for generating a high frequency carrier signal, and means (12) for generating a low frequency modulating signal. The carrier signal is continuously fed to a modulator (20) and the modulating signal is fed through a pulse switch (23) to the modulator. When the pulse switch (23) is on, the modulator (20) will produce sideband signals above and below the carrier signal frequency. A frequency-responsive device (31) is tuned to one of the sideband signals and away from the carrier frequency so that the high frequency energization of the frequency-responsive device (31) is controlled by the pulse switch (23).

摘要翻译： 一种适用于脉冲式微波光谱仪（10）的高频能量脉冲系统，包括用于产生高频载波信号的装置（11,19），以及用于产生低频调制信号的装置（12）。 载波信号被连续馈送到调制器（20），并且调制信号通过脉冲开关（23）馈送到调制器。 当脉冲开关（23）接通时，调制器（20）将产生高于和低于载波信号频率的边带信号。 频率响应装置（31）被调谐到边带信号中的一个并且远离载波频率，使得频率响应装置（31）的高频通电由脉冲开关（23）控制。

公开(公告)号：US4034191A

公开(公告)日：1977-07-05

申请号：US588264

申请日：1975-06-19

申请人： Barrett L. Tomlinson ,  Howard D. W. Hill

发明人： Barrett L. Tomlinson ,  Howard D. W. Hill

IPC分类号： G01R23/16 ,  G01R33/36 ,  G01N27/78 ,  G01R33/08

CPC分类号： G01R33/3607 ,  G01R23/16

摘要： Broadband RF excitation for a Fourier transform spectrometer is obtained by synthesizing the time domain excitation from the desired frequency spectrum of RF excitation. Means are provided to Fourier transform the desired spectral data from the frequency domain into the time domain to obtain a modulation output for modulating an RF carrier signal to generate the desired sideband of RF excitation. In a preferred embodiment, the desired frequency domain data, as tabled in the computer, has a pseudorandom phase shift added to each component for scrambling the phases of the RF excitation. The excited RF resonance signals in the time domain are detected, time-averaged, Fourier transformed to the frequency domain and, in the case of phase scrambling, unscrambled by the pseudorandom phase angle sequence, and displayed.

摘要翻译： 通过从RF激发的期望频谱合成时域激发，获得用于傅立叶变换光谱仪的宽带RF激励。 提供了将期望的频谱数据从频域傅里叶变换到时域的装置，以获得用于调制RF载波信号以产生RF激励的期望边带的调制输出。 在优选实施例中，如计算机中所提供的所需频域数据具有加到每个分量上的伪随机相移，用于扰频RF激励的相位。 在时域中激发的RF共振信号被检测，时间平均，傅里叶变换到频域，并且在相位加扰的情况下，被伪随机相位角序列解扰并显示。

公开(公告)号：US3878454A

公开(公告)日：1975-04-15

申请号：US38064773

申请日：1973-07-19

申请人： VARIAN ASSOCIATES

发明人： HYDE JAMES S

IPC分类号： G01R33/60 ,  G01R33/20 ,  G01R33/345 ,  H01P7/06 ,  G01N27/78

CPC分类号： H01P7/06 ,  G01R33/345

摘要： An EPR spectrometer resonant cavity having an aperture for sample introduction that is typically a rectangular or cylindrical pipe. The pipe is dimensioned so that it can be considered a waveguide which is not beyond cutoff. The aperture and pipe are precisely placed on the cavity wall so that, due to symmetry, the lowest frequency propagation mode is not excited. At the end of the pipe removed from the cavity a conveniently removable second rectangular or cylindrical pipe is provided which is coaxial with the first pipe. The second pipe is smaller than the first pipe and is dimensioned to be beyond cutoff for all propagation modes so as to enable convenient introduction of large and small samples without any disturbance of a permanent wall of the cavity and with virtually no radiation losses during operation.

摘要翻译： 具有用于样品引入的孔的EPR光谱仪谐振腔，其通常为矩形或圆柱形管。 管道的尺寸设计使得它可以被认为是不超过切断的波导。 孔和管被精确地放置在腔壁上，使得由于对称性，最低频率传播模式不被激发。 在从腔排出的管的端部设置有与第一管同轴的方便的可移除的第二矩形或圆柱形管。 第二个管道比第一个管道小，并且对于所有传播模式的尺寸设定为超过截止值，以便能够方便地引入大的和小的样品，而不会对空腔的永久壁造成任何干扰，并且在操作期间实际上没有辐射损失​​。

公开(公告)号：US3858112A

公开(公告)日：1974-12-31

申请号：US39916973

申请日：1973-09-20

申请人： NIPPON ELECTRIC VARIAN LTD

发明人： SATOH Y ,  FUNAKI H

IPC分类号： G01R33/36 ,  G01N27/78

CPC分类号： G01R33/3621

摘要： A receiver circuit for a nuclear magnetic resonance analyser includes a resonance circuit and an amplifier circuit. The resonance circuit includes a receiving coil for detecting nuclear magnetic resonance signals of two different frequencies and a crystal resonator connected in series with the receiving coil. The crystal resonator being chosen so that it is substantially inductive at the lower of the two frequencies and is substantially capacitive at the higher of the two frequencies. The output impedance of the resonance circuit is matched to the input impedance of an amplifier circuit to which it is attached at the two different frequencies. By use of this circuit signals of the two different frequencies may be amplified by a single amplifier.

摘要翻译： 用于核磁共振分析仪的接收器电路包括谐振电路和放大器电路。 谐振电路包括用于检测两个不同频率的核磁共振信号的接收线圈和与接收线圈串联连接的晶体谐振器。 选择晶体谐振器使得其在两个频率的较低处基本上是电感的，并且在两个频率的较高处基本上是电容性的。 谐振电路的输出阻抗与其在两个不同频率处连接的放大器电路的输入阻抗匹配。 通过使用该电路，两个不同频率的信号可以由单个放大器放大。

公开(公告)号：US3824451A

公开(公告)日：1974-07-16

申请号：US30694772

申请日：1972-11-15

申请人： VARIAN ASSOCIATES

发明人： FREEMAN R ,  HILL H

IPC分类号： G01J3/12 ,  G01N24/00 ,  G01N24/08 ,  G01R33/46 ,  G01N27/78

CPC分类号： G01N24/00 ,  G01R33/46

摘要： A magnetic resonance spectrometer, for example a pulse modulated Fourier transform spectrometer system, wherein the carrier frequency is positioned on an undesired output resonance line, the receiver circuitry of the system including a quadrature phase detection stage in which the resonance lines falling on the positive and negative frequency side of the zero frequency position in the output spectrum corresponding to the carrier frequency component may be distinguished, the receiver circuitry including a high pass filter positioned between the quadrature phase detector stage and the analog to digital converter for removing all frequency components near the zero component from the signal transmitted to the analog to digital converter, whereby the strong undesired resonance line is eliminated from the output spectrum.

摘要翻译： 磁共振光谱仪，例如脉冲调制傅里叶变换光谱仪系统，其中载波频率位于不期望的输出谐振线路上，该系统的接收机电路包括正交相位检测阶段，其中谐振线路落在正的和 可以区分对应于载波频率分量的输出频谱中的零频率位置的负频率侧，接收机电路包括位于正交相位检测器级与模数转换器之间的高通滤波器，用于去除在 从传输到模拟到数字转换器的信号中的零分量，从而从输出频谱中消除强的不期望的谐振线路。

公开(公告)号：US3812418A

公开(公告)日：1974-05-21

申请号：US16214171

申请日：1971-07-13

申请人： SPECTROSPIN AG

发明人： TSCHOPP W

IPC分类号： G01R33/44 ,  G01R33/46 ,  G01N27/78

CPC分类号： G01R33/4616 ,  G01R33/44

摘要： In the excitation of spin resonances by means of an RF-pulse in a sample arranged in a homogeneous magnetic field for purposes of spin resonance spectrometry, a limitation of the energy of excitation to the frequency range of interest and an essentially constant amplitude of the energy of excitation in that range of frequency is achieved by application of an RF-pulse with an amplitude variable in time which, at least approximately, corresponds to a sine x/x function. Such amplitude function can be generated by a modulation unit which is controlled either by a digital computer with a stored amplitude function or by the output signal of an analog computer solving a suitable differential equation.

公开(公告)号：US3808518A

公开(公告)日：1974-04-30

申请号：US19070271

申请日：1971-10-20

申请人： SERGEEV A ,  PAVLOV B ,  ALEXANDROV A ,  IGNATOV B

发明人： IGNATOV B ,  ALEXANDROV A ,  PAVLOV B ,  SERGEEV A

IPC分类号： G01R33/44 ,  G01N27/78

CPC分类号： G01R33/441

摘要： A pulsed VHF radio spectrometer for the invenstigation of nuclear quadrupole resonance (NQR) in solids, in which the tuning arrangements of the anode and grid tanks in a double-tank r.f. pulse oscillator are kinematically linked to each other and to the tuning arrangement of the tuned circuit of a local oscillator by means of a drive having a programmer. The latter is made such that the grid tank in the r.f. pulse oscillator and the localoscillator tuned circuit are swept in frequency in a predetermined manner. The radio spectrometer disclosed herein has an inductance coil to enclose the solid test specimen, which is electrically connected to the r.f. pulse oscillator through a matching means which matches the impedance of the inductance coil to the impedance of the anode tank in the r.f. pulse oscillator. The circuit parameters of the matching means and the circuit parameters of the inductance coil determine the above-mentioned manner for frequency sweeping.

摘要翻译： 用于固体中核四极共振（NQR）的混合的脉冲VHF射线分光仪，其中阳极和电池在双槽r.f.中的调谐布置。 脉冲振荡器通过具有编程器的驱动器在运动学上被连接到本地振荡器的调谐电路的调谐装置。 后者被制成使得在r.f. 脉冲振荡器和本地振荡器调谐电路以预定方式扫频。 本文公开的放射分光计具有电感线圈以包围固体试样，其电连接到r.f. 脉冲振荡器通过匹配装置将电感线圈的阻抗与r.f中的阳极罐的阻抗相匹配。 脉冲振荡器。 匹配装置的电路参数和电感线圈的电路参数决定了上述扫频方式。

公开(公告)号：US3795856A

公开(公告)日：1974-03-05

申请号：US3795856D

申请日：1972-05-19

申请人： SPECTROSPIN AG

发明人： KELLER T

IPC分类号： G01R33/36 ,  G01R33/38 ,  G01R33/46 ,  G01N27/78

CPC分类号： G01R33/46 ,  G01R33/3607

摘要： A method and apparatus are described for performing time shared spin resonance analyses. A sideband of a pulse modulated RF signal is used to excite the spins of a sample, and the signals received from the excited spins are heterodyned with the carrier frequency of the pulse modulated RF signal. The heterodyned signal is detected by mixing it with a signal having a frequency equal to the product of the pulse repetition rate and the ordinal number of the sideband used to excite the spins. The frequency of the sideband used to excite the spins of the sample is swept through a range of frequencies simply by varying the pulse repetition rate. During such variations in the pulse repetition rate, the amplitude of the sideband signal is kept constant by varying the pulse duration or the amplitude of the carrier frequency signal. Apparatus for carrying out the method is described.

摘要翻译： 描述了用于执行时间共享自旋谐振分析的方法和装置。 脉冲调制RF信号的边带用于激发采样的自旋，并且从被激励的自旋接收的信号与脉冲调制的RF信号的载波频率进行外差。 通过将外频信号与频率等于用于激励自旋的边带的脉冲重复率和序数的乘积的信号混合来检测外差信号。 用于激发样品的自旋的边带的频率简单地通过改变脉冲重复率而扫过频率范围。 在脉冲重复率的这种变化期间，边带信号的幅度通过改变载波频率信号的脉冲持续时间或振幅而保持恒定。 描述用于执行该方法的装置。

公开(公告)号：US3792345A

公开(公告)日：1974-02-12

申请号：US3792345D

申请日：1972-04-14

申请人： NEWPORT INSTR LTD

发明人： HAWKINS F

IPC分类号： G01R33/46 ,  G01N27/78

CPC分类号： G01R33/46

摘要： In the use of spectrometric apparatus incorporating a resonant circuit an artificial signal is generated for checking, calibration or measurement purposes. The artificial signal is generated by periodically switching a resistance into and out of circuit with the resonant circuit, preferably also biasing out the normal resonance signals. It is particularly applicable to the monitoring of on-line flow systems.

摘要翻译： 在使用包含谐振电路的光谱仪器时，产生用于检查，校准或测量目的的人造信号。 人造信号是通过使用谐振电路周期性地切换电阻进入和断开电路而产生的，优选地还偏置正常共振信号。 特别适用于在线流量监测系统。

公开(公告)号：US3787760A

公开(公告)日：1974-01-22

申请号：US3787760D

申请日：1972-06-02

申请人： SPECTROSPIN AG

发明人： KELLER T ,  TSCHOPP W

IPC分类号： G01N24/00 ,  G01R33/46 ,  G01N27/78

CPC分类号： G01N24/00 ,  G01R33/4616

摘要： A method and apparatus are described for performing pulsed double resonance analyses such as selective saturation and homonuclear decoupling. The method comprises exciting the spins of a spin system in a sample with a series of RF pulses, exciting selected spins of the spin system with an RF signal having frequency components at approximately the Larmor (or resonance) frequencies of the selected spins, receiving the resultant free precession decay signals (or interferograms) of the resonant frequencies generated by the excitations, averaging a plurality of the free precession decay signals, and Fourier analyzing the mean value of the free precession decay signals to determine the spectral response. The excited spin system may be the set of spins associated with one type of nuclei in a sample. Apparatus for carrying out the method includes an RF generator and RF gate for producing a series of RF pulses to excite all the spins of the spin system, and at least one additional RF generator and RF gate for producing an RF oscillation to selectively excite only certain spins of the spin system.

摘要翻译： 描述了用于执行脉冲双共振分析的方法和装置，例如选择饱和和同核解耦。 该方法包括利用一系列RF脉冲激发样品中的自旋系统的自旋，利用RF信号激励所述自旋系统的选定旋转，所述RF信号的频率分量大约为所选自旋的拉莫尔（或共振）频率，接收 由兴奋产生的谐振频率产生的自由进动衰减信号（或干涉图），对多个自由进动衰减信号进行平均，并傅里叶分析自由进动衰减信号的平均值以确定光谱响应。 激发的自旋系统可以是与样品中的一种类型的核相关的一组旋转。 用于执行该方法的装置包括用于产生一系列RF脉冲以激发自旋系统的所有自旋的RF发生器和RF门，以及用于产生RF振荡的至少一个附加RF发生器和RF门，以选择性地激发仅一定的 旋转系统的旋转。