公开(公告)号：US12072401B2

公开(公告)日：2024-08-27

申请号：US17537935

申请日：2021-11-30

Applicant: Bruker BioSpin GmbH

Inventor： Ion Prisecaru ,  Lukas Haenichen

IPC: G01R33/383 ,  G01R33/38 ,  G01R33/60 ,  H01F7/20

CPC classification number: G01R33/383 ,  G01R33/3806 ,  G01R33/60 ,  H01F7/202

Abstract: An electron paramagnetic resonance (EPR) spectrometer includes a magnet system comprising at least one magnet and at least one pole piece for producing a magnetic field along a pole axis in a field of view in front of the at least one pole piece. A probe head comprising a microwave resonator and at least one modulation coil or rapid scan coil produces an additional, time-varying magnetic field aligned along the pole axis. The probe head is arranged in the field of view, and a respective modulation coil or rapid scan coil is arranged between the microwave resonator and a respective pole piece. For each pole piece, at least a part of said pole piece is made of a function material having an electric conductivity σf of 104 S/m or less, and having a saturation magnetic flux density BSf of 0.2 T or more.

公开(公告)号：US11914010B2

公开(公告)日：2024-02-27

申请号：US17391157

申请日：2021-08-02

Applicant: Bruker BioSpin GmbH

Inventor： Ion Prisecaru

IPC: G01R33/345 ,  G01R33/36 ,  G01R33/60 ,  G01R33/34

CPC classification number: G01R33/345 ,  G01R33/3692 ,  G01R33/60 ,  G01R33/34069

Abstract: A coupling device is provided for coupling microwave radiation from a first microwave structure, in particular a microwave waveguide, into a second microwave structure, in particular a microwave resonant cavity, wherein the first and second microwave structures share a common wall, through an iris opening in said wall in front of which the coupling device is positioned on the side of the first microwave structure, in particular wherein the coupling device is of a basically cylindrical shape, characterized in that the coupling device comprises N electrically conducting conductor loops, with N≥3, preferably 3≤N≤20, that the conductor loops are arranged coaxially in an array along a z-axis, and that axially neighboring conductor loops are separated by a dielectric. The inventive coupling device allows for a larger coupling coefficient, and in particular allows for a larger dynamic range.

公开(公告)号：US11079457B2

公开(公告)日：2021-08-03

申请号：US16933222

申请日：2020-07-20

Applicant: Bruker BioSpin GmbH

Inventor： Ion Prisecaru ,  Peter Höfer

IPC: G01R33/60 ,  G01N24/10

Abstract: A microwave resonator for an electron paramagnetic resonance probehead comprises a cavity body supporting an electromagnetic microwave resonance mode, at least one sample opening for inserting a sample in a sample container, at least one microwave opening for transmitting microwave radiation into the resonator, and at least one access opening for inserting and removing a modifier in a modifier vessel into or out of the cavity body. The modifier vessel is fixed in the at least one access opening, the modifier is a fluid comprising attenuator fluid and/or marker fluid and/or adaptor fluid, and the modifier vessel has an insert opening for filling and discharging the modifier gradually into or out of the cavity body. This improves performance greatly, enabling a gradual modification of specific experimental conditions without moving any mechanical parts in the cavity body, and without changing other experimental conditions for Q- and/or M- and/or D-variation.

公开(公告)号：US20160274200A1

公开(公告)日：2016-09-22

申请号：US15063536

申请日：2016-03-08

Applicant: Bruker BioSpin GmbH

Inventor： Ion Prisecaru ,  Peter Hoefer

IPC: G01R33/343 ,  H01P7/10 ,  G01R33/60

CPC classification number: G01R33/343 ,  G01R33/345 ,  G01R33/60 ,  H01P7/10

Abstract: A microwave resonator for an EPR probe head has a metal cavity body (1) supporting an electromagnetic microwave resonance mode. The metal cavity body (1) has an opening for inserting a sample tube (2) to a center position of the resonator. The center of the opening and the center position of the resonator define an x-axis. The cavity body also has an opening for transmitting microwave radiation into the resonator. Two dielectric elements (4a, 4b) are located symmetrically to the E-field nodal plane containing the x-axis and a z-axis perpendicular to the x-axis. Each dielectric element is geometrically formed and positioned such that it provides an equal overlap with a local maximum of the microwave electric field energy. The microwave resonant cavity has a thin planar shape and the resonator is loaded with two dielectric elements, placed symmetrically relative to the central EPR sample.

Abstract translation: 用于EPR探针头的微波谐振器具有支撑电磁微波谐振模式的金属腔体（1）。 金属腔体（1）具有用于将样品管（2）插入到谐振器的中心位置的开口。 开口的中心和谐振器的中心位置定义了x轴。 空腔体还具有用于将微波辐射传输到谐振器中的开口。 两个电介质元件（4a，4b）对称地位于包含x轴和垂直于x轴的z轴的电场节点平面。 每个电介质元件被几何地形成和定位成使得其提供与微波电场能的局部最大值相等的重叠。 微波谐振腔具有薄的平面形状，并且谐振器装载有相对于中央EPR样本对称放置的两个电介质元件。

公开(公告)号：US20210018585A1

公开(公告)日：2021-01-21

申请号：US16933222

申请日：2020-07-20

Applicant: Bruker BioSpin GmbH

Inventor： Ion Prisecaru ,  Peter Höfer

IPC: G01R33/60 ,  G01N24/10

Abstract: A microwave resonator for an electron paramagnetic resonance probehead comprises a cavity body supporting an electromagnetic microwave resonance mode, at least one sample opening for inserting a sample in a sample container, at least one microwave opening for transmitting microwave radiation into the resonator, and at least one access opening for inserting and removing a modifier in a modifier vessel into or out of the cavity body. The modifier vessel is fixed in the at least one access opening, the modifier is a fluid comprising attenuator fluid and/or marker fluid and/or adaptor fluid, and the modifier vessel has an insert opening for filling and discharging the modifier gradually into or out of the cavity body. This improves performance greatly, enabling a gradual modification of specific experimental conditions without moving any mechanical parts in the cavity body, and without changing other experimental conditions for Q- and/or M- and/or D-variation.

公开(公告)号：US10656230B2

公开(公告)日：2020-05-19

申请号：US15850259

申请日：2017-12-21

Applicant: Bruker BioSpin GmbH

Inventor： Peter Hoefer ,  Ion Prisecaru

IPC: G01R33/565 ,  G01R33/60 ,  H01P7/06 ,  G01R33/345 ,  H01P7/00

Abstract: An EPR resonator for a cylindrical TE01n microwave mode, where n=1, 2, 3, or 4, has: a cylindrical body (10) which has an RF absorption of less than 5% at RFs below 1 kHz, a first plunger (11) delimiting the resonating volume within the body in an axial direction at a first end and a second plunger (12) delimiting the resonating volume within the body at a second end, the second plunger having an opening (13) for inserting an EPR sample. The first and second plunger each has a spiral winding of an electrically conductive filament wherein neither the ends nor neighboring turns of the spiral windings have electrically conductive connections prone to forming electrically closed loops. Using spiral winding plungers for cylindrical TE01n microwave modes provides equivalent functionality compared to conventional plungers, but without creating Eddy currents at frequencies lower than the frequency of the TE01n microwave mode.

公开(公告)号：US10353027B2

公开(公告)日：2019-07-16

申请号：US15063536

申请日：2016-03-08

Applicant: Bruker BioSpin GmbH

Inventor： Ion Prisecaru ,  Peter Hoefer

IPC: H01P7/10 ,  G01R33/343 ,  G01R33/345 ,  G01R33/60

Abstract: A microwave resonator for an EPR probe head has a metal cavity body (1) supporting an electromagnetic microwave resonance mode. The metal cavity body (1) has an opening for inserting a sample tube (2) to a center position of the resonator. The center of the opening and the center position of the resonator define an x-axis. The cavity body also has an opening for transmitting microwave radiation into the resonator. Two dielectric elements (4a, 4b) are located symmetrically to the E-field nodal plane containing the x-axis and a z-axis perpendicular to the x-axis. Each dielectric element is geometrically formed and positioned such that it provides an equal overlap with a local maximum of the microwave electric field energy. The microwave resonant cavity has a thin planar shape and the resonator is loaded with two dielectric elements, placed symmetrically relative to the central EPR sample.