33 results about "High resolution nmr" patented technology

An apparatus and method is discussed for characterizing a fluid sample downhole of aliphatic hydrocarbon compounds, aromatic hydrocarbon compound, or connate mud filtrates containing carbon-13 isotopes using an enhanced nuclear magnetic resonance (NMR) signal on a measurement-while-drilling device. To enhance the carbon-13 NMR signal these nuclei are being hyperpolarized. Either the Overhauser Effect (OE) or the Nuclear Overhauser Effect or optical pumping and the Spin Polarization Induced Nuclear Overhauser Effect (SPINOE) can serve as a mechanism for hyperpolarization of the carbon-13 nuclei.

A method and apparatus for treating a sample for acquiring high-definition magnetic resonance images (MRI images) or high resolution nuclear magnetic resonance (NMR) spectra even in the presence of magnetic field distortions within one or multiple scans. The spatial nature and temporal dependence of the field inhomogeneities are determined a priori using any of several literature procedures. A static or oscillating magnetic field gradient is applied on the sample so as to endow spins at different positions within the sample with different resonance frequencies. A phase- and amplitude-modulated radiofrequency (RF) pulse is applied in unison with the magnetic field gradient so as to endow spins at different positions within the sample with a homogeneous excitation / inversion profile. The nature of the spatially-selective RF irradiation is tailored in such a way that, when added on top of the effects of the inhomogeneities, the spins' evolution phases and their signal amplitudes at the time of the acquisition become independent of the inhomogeneities. The spin signals thus created are captured and decoded, so as to obtain the spins' response as if the inhomogeneity was not present. The collected data is processed to a suitable rearrangement and Fourier analysis procedure to retrieve a final undistorted image or spectrum. The magnetic field gradient can be oscillated to impose this kind of inhomogeneity corrections on multiple spatial dimensions sequentially, or simultaneously.

A probe, device, and methods for performing nuclear magnetic resonance (NMR) measurements on a suitable sample are provided. The probe includes a hyper polarized tip positioned to cause a dipolar interaction between the tip and sample. The nuclear magnetic spin of a selected portion of the sample induces a modulation of tip magnetization, which is proportional to the local magnetization of the selected portion. An NMR device includes the probe, a radio frequency (RF) coil for manipulating spins in the sample and tip, and a means for detecting the modulation of tip magnetization. An RF pulse sequence selects the selected portion and allows detection of the modulation. The method for obtaining NMR data includes positioning the tip to induce the dipolar interaction; selecting the sample portion; modulating the tip magnetization in response thereto; and detecting the tip modulation. The device and method may be adapted to obtain NMR images and spectroscopy.

The present invention discloses a sample tube for the magic angle high-speed rotation method used in a solid nuclear magnetic resonance device probe wherein a radio wave irradiation / detection coil is disposed close to a sample and a method of measuring a high resolution nuclear magnetic resonance absorption spectrum using the same. This tube is suitable for solid nuclear magnetic resonance (solid NMR) measurements of minute amounts of sample. The sample tube has a capillary part filled with a sample and non-capillary parts situated at its two ends, and a spinner which can be detachably inserted into at least one of the outer ends of the non-capillary parts. The capillary part and non-capillary parts are made of a ceramic and / or polymer material.

A pellicle is used for a photolithographic patterning process using a light having a wavelength of from 100 to 200 nm. The pellicle contains a pellicle membrane containing (A) a substantially linear fluoropolymer which has an alicyclic structure in its main chain, the main chain being a chain of carbon atoms, and the fluropolymer satisfying the following requirements (1) the carbon atoms in the main chain of the fluoropolymer contain a carbon atom having at least one hydrogen atom bonded thereto and a carbon atom having no hydrogen atom bonded thereto; and (2) in the measurement of a high resolution proton magnetic resonance spectrum of the fluoropolymer, a number of hydrogen atoms based on signals appearing on the higher magnetic field side higher than 2.8 ppm, is at most 6 mol % based on a total number of hydrogen atoms.

Methods and systems for determining location of hydrocarbon in unconventional plays are provided. The methods provide at least two steps of measuring formation samples as received, as dried and / or as saturated using high resolution NMR, and subsequent processing of the NMR data to determine one of several formation properties or components where the formation property or the component can be used to locate an oil or gas reservoir, complete a well, and / or increase production efficiency. Also, the present methods provide a series of sequential and ordered combination of steps related to the financial evaluation of number of barrels of oil or cubic feet of gas which can be produced at a location.

A high-resolution NMR probe is offered which is simple in structure and can be fabricated at low cost. The inside of the probe is maintained in a vacuum to adiabatically isolate the inside from the outside. Liquid helium is sent into a first heat exchanger located immediately close to a measurement portion via the innermost region of a triple tube placed in the vacuum. The helium is evaporated in the exchanger to cool a transmit-receive coil and a variable capacitor. The evaporated helium gas is returned via the outermost region of the triple tube. At this time, a radiation shield placed in the vacuum is cooled by a second heat exchanger placed in the return path.

A method and apparatus for improving spectral resolution of an NMR measurement in the presence of an inhomogeneous magnetic field. According to one embodiment, a method producing a high resolution nuclear magnetic resonance (NMR) spectrum for a sample in an inhomogeneous magnetic field may comprise generating a first magnetic pulse and a second magnetic pulse, the first and second magnetic pulses being separated in time by a first time period, during the first time period, generating a gradient pulse, repeating the steps of generating the first and second magnetic pulses and generating the gradient pulse N times for different values of a field strength of the gradient pulse, wherein N is an integer greater than one, after each second magnetic pulse, acquiring a signal from the sample, and producing a reconstructed high resolution NMR spectrum from the acquired signals.

An NMR measurement method adapted for measurements on solid mixture samples starts with irradiating a pulse sequence to the sample in order to measure the longitudinal magnetization relaxation times of nuclei possessing homogeneous longitudinal magnetization relaxation times (step 1). After a lapse of a given period of time t, a high-resolution NMR spectrum is acquired by nullifying spin diffusion across the nuclei (step 2). The steps 1 and 2 are repeated while varying the period of time t. The high-resolution NMR spectra are classified according to value of longitudinal magnetization relaxation time by inverse Laplace transform.

The invention relates to a method and a device for improving spectral resolution measured by NMR under the condition of a non-uniform magnetic field. According to one embodiment, the method used for aiming at a high resolution nuclear magnetic resonance (NMR) spectrum generated by a sample in the non-uniform magnetic field comprises the following steps: generating a first magnetic pulse and a second magnetic pulse, existing a first period of time between the first magnetic pulse and the second magnetic pulse in time, and in the first period of time, generating a gradient pulse; aiming at different values of the magnetic-field intensity of the gradient pulse, repeatedly generating the first magnetic pulse, the second magnetic pulse and N times of steps of the gradient pulse, wherein the N is an integer more than one; and acquiring a signal from the sample after each second magnetic pulse, and generating a reconstructed high resolution NMR spectrum according to the acquired signal.

A method for high resolution NMR (=nuclear magnetic resonance) measurements using the application of excitation pulses and the acquisition of data points, whereby a dwell time Δt separates the acquisition of two consecutive data points, which is characterized in that one or more tickling rf (=radio frequency) pulses of duration τp are applied within each dwell time Δt, and that the average rf field amplitude of each of the tickling rf pulses approximately fulfills the condition ω1=ω1τp / Δt=πJ wherein J is the scalar J-coupling constant and ω1=γB1 with γ being the gyromagnetic ratio and B1 being the strength of the magnetic component of each tickling rf pulse. This method is effective in decoupling homonuclear couplings.

The utility model relates to an experimental device for nuclear magnetic resonance edge magnetic field imaging, which relates to nuclear magnetic resonance imaging. Equipped with servo motor, voice coil motor, coarse adjustment non-magnetic lifting platform, fine adjustment non-magnetic lifting platform, nuclear magnetic resonance edge magnetic field imaging probe, sample chamber, probe coil and sample relative movement / stationary conversion pin, coarse adjustment and fine adjustment non-magnetic Lifting table grating ruler and control system; the control system is equipped with a host computer, PMAC controller, servo motor driver and voice coil motor controller. Combining the two-stage lifting high-precision mechanical structure of coarse adjustment and fine adjustment with advanced closed-loop control algorithm, it can realize the high-precision movement of the sample with the highest precision of 1 μm, and complete the high-precision and high-resolution nuclear magnetic resonance edge magnetic field imaging. Two experimental methods, namely, the relative moving imaging between the probe coil and the sample and the relatively static imaging between the probe coil and the sample, can be realized without any secondary modification on an experimental device, which ensures that the strong magnetic environment is not affected to the greatest extent; the closed-loop control makes the sample The more precise the displacement, the more accurate the result.