Universiteit Leiden

Arthur Den Haan

Tjerk Oosterkamp

Jelmer Wagenaar

Rembrandt Donkersloot

A method for operating a flowmeter is disclosed. The flowmeter has a sensor for capturing a measured variable indicating the flow, and for converting the measured variable into a signal. The flowmeter also has a control and evaluation unit that determines a flow measurement value for the flow from the signal and outputs an output value representing the flow measurement value. The method includes: determining flow measurement values; forming smoothed flow measurement values over a plurality of flow measurement values, respectively; and activating a low flow cut-off. When the low flow cut-off is activated, the output value is set to zero if: the current smoothed flow measurement value is below a first predetermined limit value; and a predetermined number of flow measurement values has been determined with deactivated low flow cut-off or a predetermined number of smoothed flow measurement values has been formed with deactivated low flow cut-off.

Method for operating a flowmeter and flowmeter

A magnetic resonance force detection apparatus, comprising: a sample carrier for carrying a sample to be tested; a magnetic field source configured to provide a magnetic field to a sample when it is carried by the sample carrier; a support for supporting either the sample carrier or the magnetic field source; a support-driving-mechanism configured to drive the support such that the sample carrier moves relative to the magnetic field source, such that the magnetic field is configured to cause the spins of one or more nuclei or electrons in the sample to flip, and wherein the flipping of spins exerts a force on the support; and a support-displacement-measuring-sensor configured to measure displacement of the support and generate a signal representative of the displacement of the support.

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Leiden, Netherlands

Arthur Den Haan