Bruker Biospin Gmbh | Date: 2016-09-16
A cryostat includes a magnet arrangement for the generation of a magnetic field B0, the magnet arrangement comprising an LTS portion having at least one LTS section made from a conventional low-temperature superconductor and an HTS portion having at least one HTS section made from a high-temperature superconductor. The HTS portion is arranged radially within the LTS portion, and the cryostat is designed to control the temperature of the LTS portion and the HTS portion independently of one another, wherein the HTS portion is electrically isolated from the LTS portion, and is designed to be superconductingly short-circuited. The invention proposes a cryostat with magnet arrangement which enables a high magnetic field strength in a compact space and, at the same time, can be easily constructed.
Bruker Biospin Gmbh | Date: 2016-08-01
A method is provided for precooling a cryostat having a hollow cold head turret into which a neck tube protrudes and connects an object to be cooled to the exterior of the cryostat, wherein a cold head having a cold head stage for cooling a cryogenic working medium may be introduced into the neck tube. During a condensation operation the cryogenic working medium flows through a heat pipe into an evaporator chamber which is thermally conductively connected to the object to be cooled. During a precooling phase a precisely fitting, thermally conductive short circuit block is inserted through the neck tube into the heat pipe to provide thermal conduction between the object to be cooled and a cooling device The short circuit block is removed from the heat pipe after the target temperature is reached, and heat is subsequently transmitted through the heat pipe during a condensation operation.
Bruker Biospin Gmbh | Date: 2016-06-28
A cryostat arrangement has an outer jacket, a first tank with a first cryogen, and a second tank with a second liquid cryogen which boils at a higher temperature than the first cryogen. The first tank comprises a neck tube, whose hot upper end is connected to the outer jacket at ambient temperature and whose cold lower end is connected to the first tank at a cryogenic temperature. The arrangement uses a riser pipe protruding into the second tank through which the second liquid cryogen can flow out of the second tank and into a first heat exchanger in thermal contact with the neck tube. An outflow line is provided through which second cryogen evaporating from the first heat exchanger can flow out and into an optional second heat exchanger. It is thus possible to greatly reduce heat input from the neck tube into the first tank.
Bruker Biospin Gmbh | Date: 2016-05-12
An MAS stator (7) for an NMR-MAS probe head (1) has a bottom bearing (8) with at least one nozzle and at least one radial bearing (9a, 9b), wherein one substantially circular cylindrical MAS rotor (21c) is provided for receiving a measurement substance. The MAS rotor can be supported by compressed gas in a measurement position within the MAS stator by means of a gas supply device and can be rotated about the cylinder axis of the MAS rotor by means of a pneumatic drive. A suction device (100) is provided in a space below the radial bearing for suctioning-off the gas introduced by the gas supply device, and generates an underpressure in the space below the radial bearing during measurement operation. This provides a stator for NMR-MAS spectroscopy in which the closure at the head end of the stator is omitted.
Bruker Biospin Gmbh | Date: 2016-03-16
Monitoring cell (100) for performing an NMR measurement of a reaction fluid. The monitoring cell (100) has a hollow NMR sample probe (110) for receiving the reaction fluid. Inlet and outlet transport capillaries (112, 123) transport the reaction fluid to and from the sample probe (110). A feed line (306) and return line transport a temperature control fluid to and from the monitoring cell (100). An adapter head (108) couples the transport capillaries (112, 123) to the sample probe (110) and removably connects the sample probe (110) to an adapter section (106). The transport capillaries (112, 123) are positioned within the feed line (306) in parallel to one another. The feed and the return lines (306, 358) are attached to the adapter section (106) such that a reversal of the temperature control fluid stream occurs in the adapter section (106).
Bruker Biospin Gmbh | Date: 2016-03-08
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.
Bruker Biospin Gmbh | Date: 2015-09-10
A cryostat has a cooling arm with a first thermal contact surface which can be brought into thermal contact with a second thermal contact surface on an object to be cooled. A hollow volume (2) between the inner side of the neck tube, the cooling arm, and the object is filled with gas and the cooling arm is pressurized by the inner pressure of the gas and also by atmospheric pressure. A contact device brings the first and the second contact surfaces into thermal contact below a threshold gas pressure and moves them away from each other when the threshold pressure has been exceeded such that a gap (13) filled with gas thermally separates the first and second contact surfaces. Operationally safe and fully automatic reduction of the thermal load acting on the object to be cooled is thereby obtained in case the cooling machine fails.
Bruker Biospin Gmbh | Date: 2015-02-19
A method for determining the concentration of a substance in a sample (91) calculates a plurality of intermediate spectra (ZW1, ZW2) from a measured reference spectrum (RS) of the substance. For calculating the intermediate spectra (ZW1, ZW2), the following individual steps are applied to the reference spectrum (RS): shifting the position in accordance with a shift parameter; multiplication with an amplitude factor; and convolution with a system function in accordance with a line broadening parameter. The shift parameter, the amplitude factor and the line broadening parameter are changed within the scope of an optimization algorithm that iteratively optimizes the correspondence between the intermediate spectra (ZW1, ZW2) and the measured spectrum (GS). A simplified method for determining the concentration of a substance in a sample is thereby provided with which the involvement of an expert in spectral analysis is not necessarily required.
Bruker Biospin Gmbh | Date: 2015-03-02
A method for analyzing wine proposes puncturing the closure (60) of a wine bottle (61) containing wine (62) with a disposable cannula (3) having a lateral cannula opening (32) and a female Luer connection (30), and filling a disposable syringe (4) having a male Luer connection (41) with an inert gas. At least part (69) of the wine sample (65) is transferred into an analytical spectrometer (68) and spectrometric analysis of the wine sample (65) is carried out. An inexpensive method is thereby proposed that is easy to perform for analyzing a wine sample from a sealed wine bottle without impairing the quality or storage stability of the wine remaining in the wine bottle due to withdrawal of a wine sample from the wine bottle, in particular, wherein the volume of the removed wine sample can be easily controlled.
Bruker Biospin Gmbh | Date: 2016-09-21
A microwave resonator for an EPR probehead comprising a metal cavity body (1) supporting an electromagnetic microwave resonance mode having an even number of local maxima of microwave energy, 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 defining an x-axis, an opening for transmitting microwave radiation into the resonator, two identical dielectric elements (4a,4b) located symmetrically to the E-field nodal plane containing the x-axis and a z-axis perpendicular to the x-axis, is characterized in that 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. Such microwave resonant cavity has thin planar shape for an EPR probehead. The resonator is loaded with two dielectric elements, of identical shape and physical properties, placed symmetrically relative to the central EPR sample. When included in a probehead, this resonator is also contained by the mirror symmetry plane between the main magnet poles.