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38results about How to "Minimizing adverse influence" patented technology

Phase difference detection device and method for a position detector

Two A.C. output signals amplitude-modulated in accordance with two function values (sine and cosine) differing from each other in correspondence to a position-to-be-detected are received from a position sensor such as a resolver. By performing an addition or subtraction between a signal derived by shifting the electric phase of one of the received A.C. output signals by a predetermined angle, and the other received signal, two electric A.C. signals (sin(ωt±d+θ), sin((ωt±d−θ)) are electrically synthesized which have electric phase angles (θ) corresponding to the position-to-be-detected and are phase-shifted in opposite directions. “±d” here represents phase variation error caused by factors, other than the position-to-be-detected, such as temperature change. In the synthesized two signals, the phase variation errors (±d) appear in the same direction, while the phase differences (θ) corresponding to the position are shifted in opposite, positive and negative, directions. Thus, by measuring the respective phase shift amounts (±d+θ, ±d−θ) and performing appropriate operation, it is allowed to cancel out or extract the error (±d) so that an accurate phase difference (θ) can be detected. Position detection data indicative of the detected phase difference (θ) is converted into a pulse-width-modulated signal and transmitted in the pulse-width-modulated form.
Owner:AMITEQ

Cooling device for cryogenic cooling of an NMR detection system with the assistance of a container filled with a cryogenic fluid

A cryo probe head for the transmission/reception of RF signals for NMR measurements with a heat exchanger (1) for cooling heat sources (5), the heat exchanger having a contact element (4.2) for thermal connection between a cryogenic fluid and the heat source, is characterized in that the heat exchanger comprises a container having an interior volume VB into which a first cryogenic fluid F1 that has a liquid component F1L and a gaseous component F1G flows through an inflow conduit (8) and from which a second cryogenic fluid F2 that has liquid component F2L and a gaseous component F2G flows out through an outflow conduit (9). The inflow conduit has a flow cross-section QZ and a circumference UZ from which a characteristic conduit volume VZ=4·Q2Z/UZ results, wherein VB>10·VZ, and the outflow conduit has a flow diameter QA wherein QA≧QZ. The contact element is in close thermal contact with both the liquid volume component VL of the cryogenic fluid and with the heat source. A device for setting the inflow quantity of the first cryogenic fluid F1 into the container is provided that ensures a state F1L/F1G>F2L/F2G during operation. In this way, vibrations due to the cooling process can be largely reduced and the consumption of cryogenic fluid minimized.
Owner:BRUKER BIOSPIN

Method for cryogenic cooling of an NMR detection system with the assistance of a container filled with a cryogenic fluid

A method for the transmission / reception of RF signals for NMR measurements uses a heat exchanger (1) for cooling heat sources (5), the heat exchanger having a contact element (4.2) for thermal connection between a cryogenic fluid and the heat source, is characterized in that the heat exchanger comprises a container having an interior volume V.sub.B into which a first cryogenic fluid F.sub.1 that has a liquid component F.sub.1L and a gaseous component F.sub.1G flows through an inflow conduit (8) and from which a second cryogenic fluid F.sub.2 that has liquid component F.sub.2L and a gaseous component F.sub.2G flows out through an outflow conduit (9). The inflow conduit has a flow cross-section Q.sub.Z and a circumference U.sub.Z from which an associated parameter V.sub.Z=4Q.sup.2.sub.Z / U.sub.Z results, wherein V.sub.B>10V.sub.Z, and the outflow conduit has a flow diameter Q.sub.A wherein Q.sub.A.gtoreq.Q.sub.Z. The contact element is in close thermal contact with both the liquid volume component V.sub.L of the cryogenic fluid and with the heat source. A device for setting the inflow quantity of the first cryogenic fluid F.sub.1 into the container is provided that ensures a state F.sub.1L / F.sub.1G>F.sub.2L / F.sub.2G during operation. In this way, vibrations due to the cooling process can be largely reduced and the consumption of cryogenic fluid minimized.
Owner:BRUKER SWITZERLAND AG
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