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：US4065714A

公开(公告)日：1977-12-27

申请号：US698245

申请日：1976-06-21

申请人： Howard D. W. Hill

发明人： Howard D. W. Hill

IPC分类号： G01R23/16 ,  G01N24/00 ,  G01R33/20 ,  G01R33/46 ,  G01R33/08

CPC分类号： G01R33/4616 ,  G01N24/00

摘要： RF excitation for a spectrometer is obtained by pulse width modulating an RF carrier to produce the desired broadband RF exciting spectrum. The RF excitation includes a train of composite RF pulses, each composite pulse having a primary pulse portion of a first RF phase and a second pulse portion of a second RF phase opposite that of the first. In this manner, the finite rise and fall times of the primary pulse portion are compensated for by the corresponding rise and fall times of the secondary pulse portion. The primary pulse portion is lengthened by an amount equal to the secondary pulse portion so that the secondary pulse portion cancels the added primary pulse portion. In a spectrometer the compensating second pulse component removes certain undesired side bands of the RF excitation caused by the finite rise and fall times of the applied RF pulses. The compensating second pulse component removes certain undesired side bands associated with each of the resonant lines of the excited resonance spectrum, thereby simplifying the resonance spectrum of the sample under analysis, particularly for wide band RF excitation.

摘要翻译： 通过对RF载波进行脉冲宽度调制以产生期望的宽带RF激励频谱来获得用于光谱仪的RF激发。 RF激励包括一系列复合RF脉冲，每个复合脉冲具有第一RF相的主脉冲部分和与第一RF相位相反的第二RF相位的第二脉冲部分。 以这种方式，主脉冲部分的有限上升和下降时间被辅助脉冲部分的相应上升和下降时间补偿。 主脉冲部分被延长了等于次级脉冲部分的量，使得次级脉冲部分抵消了相加的初级脉冲部分。 在光谱仪中，补偿的第二脉冲分量去除由所施加的RF脉冲的有限上升和下降时间引起的RF激励的某些不期望的边带。 补偿的第二脉冲分量去除与激发的共振谱的每个谐振线相关联的某些不期望的边带，从而简化了分析下的样品的共振谱，特别是对于宽带RF激发。

公开(公告)号：US5192911A

公开(公告)日：1993-03-09

申请号：US741720

申请日：1991-08-07

申请人： Howard D. W. Hill ,  Michael D. Cummings

发明人： Howard D. W. Hill ,  Michael D. Cummings

IPC分类号： G01R33/32 ,  G01R33/34 ,  G01R33/343 ,  G01R33/422

CPC分类号： G01R33/422 ,  G01R33/343

摘要： Parasitic excitation of an NMR sample is minimized by providing shielding of the sample against RF pick-up from coil leads or like proximate conductive structure in the interior region of the RF coil.

摘要翻译： 通过为RF线圈的内部区域中的线圈引线或近似导电结构提供样品的RF拾取提供屏蔽来最小化NMR样品的寄生激发。

公开(公告)号：US4275350A

公开(公告)日：1981-06-23

申请号：US42821

申请日：1979-05-29

申请人： Howard D. W. Hill ,  Ulrich Huber

发明人： Howard D. W. Hill ,  Ulrich Huber

IPC分类号： G01R33/20 ,  G01N33/00 ,  G01R33/30 ,  G01N27/00

CPC分类号： G01R33/307 ,  Y10S505/844

摘要： An air bearing sample spinner for use in an NMR probe has a first air bearing established between frusto-conical mating surfaces of rotor and stator to provide levitation and rotation. A cylindrical portion projects from the rotor into a similar coaxial cylindrical portion of the stator where a journal bearing is provided for centering of the rotor in the stator housing.

摘要翻译： 用于NMR探针的空气轴承样品旋转器具有建立在转子和定子的截头圆锥形配合表面之间的第一空气轴承，以提供悬浮和旋转。 圆柱形部分从转子突出到定子的类似的同轴圆柱形部分，其中提供有轴颈轴承用于定子壳体中的转子的中心。

公开(公告)号：US4780673A

公开(公告)日：1988-10-25

申请号：US104880

申请日：1987-10-05

申请人： Howard D. W. Hill

发明人： Howard D. W. Hill

IPC分类号： G01R33/32 ,  G01R33/46

CPC分类号： G01R33/4625

摘要： A correction for NMR spin echo spectral data is obtained by adjusting the time origin of an extended density data set and transforming the adjusted origin data set of original density to the frequency domain.

公开(公告)号：US4070708A

公开(公告)日：1978-01-24

申请号：US719557

申请日：1976-09-01

申请人： Stephen H. Smallcombe ,  Howard D. W. Hill

发明人： Stephen H. Smallcombe ,  Howard D. W. Hill

IPC分类号： G06F3/05 ,  G01D1/02 ,  G01R33/32 ,  G01R33/46 ,  G06F17/40 ,  G06F15/34

CPC分类号： G01R33/4625 ,  G01D1/02

摘要： An analytical instrument employing ensemble averaging to improve the signal-to-noise ratio including means for determining the most efficient scaling factor and for controlling the instrument to maintain assurance of efficient averaging.

摘要翻译： 一种使用整体平均来提高信噪比的分析仪器，包括用于确定最有效的比例因子的装置，以及用于控制仪器以保持有效平均的保证。

公开(公告)号：US4171511A

公开(公告)日：1979-10-16

申请号：US896410

申请日：1978-04-14

申请人： Howard D. W. Hill

发明人： Howard D. W. Hill

IPC分类号： G01R33/36 ,  G01R33/389 ,  G01R33/46 ,  G01R33/08

CPC分类号： G01R33/3621 ,  G01R33/389 ,  G01R33/4625

摘要： The field-frequency lock system of an impulse NMR spectrometer operates in an automatic bidirectional search mode characterized by relatively low pulse repetition rate, and relatively high power excitation. Searching is accomplished by monitoring the frequency of an absorption mode lock signal with a bidirectional counter. The sense input of the bidirectional counter is derived from a phase comparison of the absorption mode signal with the concomitant dispersion mode signal. The resulting counter output is converted to analog form yielding a search mode control signal. Transitions in the sign of the phase comparison signal initiate a transition to the relatively low power, high repetition rate excitation of the lock mode. In the search mode, facility is provided to maintain the control signal output although certain transient conditions may reduce the amplitude of the lock signal below minimum levels for operation.

摘要翻译： 脉冲NMR光谱仪的场频锁定系统以自动双向搜索模式工作，其特征在于相对较低的脉冲重复率和相对高的功率激励。 通过用双向计数器监视吸收模式锁定信号的频率来实现搜索。 双向计数器的检测输入是从吸收模式信号与伴随色散模式信号的相位比较得出的。 所得到的计数器输出被转换成模拟形式，产生搜索模式控制信号。 相位比较信号的符号中的转换启动向锁定模式的相对低功率，高重复率激励的转变。 在搜索模式中，提供设施以维持控制信号输出，尽管某些瞬态条件可能将锁定信号的幅度降低到低于操作的最小水平。

公开(公告)号：US4093911A

公开(公告)日：1978-06-06

申请号：US770479

申请日：1977-02-22

申请人： Howard D. W. Hill ,  John R. Laudermilch

发明人： Howard D. W. Hill ,  John R. Laudermilch

IPC分类号： A61B5/055 ,  G01R33/36 ,  G01R33/08

CPC分类号： G01R33/3607 ,  G01R33/3621

摘要： In a nuclear magnetic resonance spectrometer a gate is employed for time share multiplexing of the resonance and transmitter signals. An improved gate circuit is connected in series between the receiver and the resonance detecting circuit employed for picking up resonance of the sample. The improved gate circuit includes a pair of parallel connected branches of PIN diodes connected between the input and output terminals of the gate. The diodes in each parallel branch are poled toward an intermediate control node in such a manner so that a positive control potential applied to the control of one branch node turns that branch on and conversely a negative control potential applied to the other control node turns on the other branch. Equal magnitude and opposite sign control pulses are applied to the control nodes so that transient switching signals, tending to leak through the gate, cancel on the output line to the RF receiver.

摘要翻译： 在核磁共振光谱仪中，采用栅极用于共振和发射信号的时间共享复用。 改进的栅极电路串联连接在接收器和用于拾取样品共振的谐振检测电路之间。 改进的栅极电路包括连接在栅极的输入和输出端子之间的PIN二极管的并联连接的一对分支。 每个并联支路中的二极管以这样的方式朝向中间控制节点极化，使得施加到一个分支节点的控制的正控制电位将该分支导通，并且相反施加到另一控制节点的负控制电位导通 其他分行。 相等幅度和相反的符号控制脉冲被施加到控制节点，使得倾向于通过栅极泄漏的瞬态开关信号在到RF接收器的输出线上消除。

公开(公告)号：US4093910A

公开(公告)日：1978-06-06

申请号：US770478

申请日：1977-02-22

申请人： Howard D. W. Hill

发明人： Howard D. W. Hill

IPC分类号： G01R33/389 ,  G01R33/20 ,  G01R33/32 ,  G01R33/36 ,  G01R33/08

CPC分类号： G01R33/3621

摘要： In a nuclear magnetic resonance spectrometer, the probe structure includes an analysis channel RF magnetic coil disposed in RF magnetic field exchanging relation with a sample of gyromagnetic resonators under analysis for detecting nuclear magnetic resonance of the sample. A control group of nuclear magnetic resonators is also disposed in the sample region and nuclear magnetic resonance of the control group is excited and detected by a second RF magnetic coil. The control RF coil is formed and arranged relative to the sample RF magnetic coil to minimize cross coupling between the sample and control channels. In a preferred embodiment, the control RF magnetic coil is coaxially disposed of the analysis RF coil and is further segmented into a pair of axially spaced portions disposed at opposite ends of the analysis coil and connected in magnetic field bucking relation relative to each other so that the RF magnetic field generated by the control RF coil cancels in the region of the analysis RF coil.

摘要翻译： 在核磁共振光谱仪中，探针结构包括分析通道RF电磁线圈，其被布置成与用于检测样品的核磁共振的回波磁共振器样品的RF磁场交换关系。 核磁共振器的对照组也设置在样品区域中，并且由第二RF电磁线圈激发和检测对照组的核磁共振。 控制RF线圈相对于采样RF电磁线圈形成和布置，以最小化采样和控制通道之间的交叉耦合。 在优选实施例中，控制RF电磁线圈同轴地布置在分析RF线圈上，并被进一步分段成一对轴向间隔开的部分，该部分设置在分析线圈的相对端并以相对于彼此的磁场屈曲关系连接， 由控制RF线圈产生的RF磁场在分析RF线圈的区域中消失。