公开(公告)号：US10598534B2

公开(公告)日：2020-03-24

申请号：US15102626

申请日：2014-11-03

Applicant: Endress + Hauser Flowtec AG

Inventor： Christof Huber ,  Vivek Kumar ,  Philipp Montsko ,  Tobias Schwer

IPC: G01F1/84 ,  G01N9/00 ,  G01N11/16 ,  G01N11/02

Abstract: The density measuring device serves for measuring density, ρ, of a flowable medium and comprises a measuring device electronics (ME) as well as a measuring transducer (MT) electrically connected therewith. The measuring transducer includes a measuring tube (10), an oscillation exciter (41) for exciting and maintaining oscillations and an oscillation sensor (51) for registering oscillations of the at least one measuring tube. The measuring device electronics is adapted by means of an oscillation measurement signal (s1) as well as an exciter signal (e1) to adjust a drive force effecting wanted oscillations (namely oscillations with a predetermined wanted frequency, fN) of the measuring tube. The drive force is adjusted in such a manner that during a predetermined phase control interval a phase shift angle, φN, by which a velocity response, VN, of the measuring tube Is phase shifted relative to a wanted force component, FN, of the drive force, is less than −20° and greater than −80°, and/or the wanted frequency has a frequency value, which corresponds to greater than 1.00001 times, equally as well less than 1.001 times, a frequency value of an instantaneous resonant frequency of the measuring tube. Moreover, the measuring device electronics is adapted based on the oscillation measurement signal (s1) present during the phase control interval to ascertain at least one frequency measured value, Xf, which represents the wanted frequency for the phase control interval, as well as also with application of the frequency measured value, Xf, to generate a density measured value, Xρ, representing a density, ρ.

公开(公告)号：US20160349091A1

公开(公告)日：2016-12-01

申请号：US15102626

申请日：2014-11-03

Applicant: ENDRESS + HAUSER FLOWTEC AG

Inventor： Christof Huber ,  Vivek Kumar ,  Philipp Montsko ,  Tobias Schwer

IPC: G01F1/84 ,  G01N11/16 ,  G01N11/02 ,  G01N9/00

Abstract: The density measuring device serves for measuring density, ρ, of a flowable medium and comprises a measuring device electronics (ME) as well as a measuring transducer (MT) electrically connected therewith. The measuring transducer includes a measuring tube (10), an oscillation exciter (41) for exciting and maintaining oscillations and an oscillation sensor (51) for registering oscillations of the at least one measuring tube. The measuring device electronics is adapted by means of an oscillation measurement signal (s1) as well as an exciter signal (e1) to adjust a drive force effecting wanted oscillations (namely oscillations with a predetermined wanted frequency, fN) of the measuring tube. The drive force is adjusted in such a manner that during a predetermined phase control interval a phase shift angle, φN, by which a velocity response, VN, of the measuring tube Is phase shifted relative to a wanted force component, FN, of the drive force, is less than −20° and greater than −80°, and/or the wanted frequency has a frequency value, which corresponds to greater than 1.00001 times, equally as well less than 1.001 times, a frequency value of an instantaneous resonant frequency of the measuring tube. Moreover, the measuring device electronics is adapted based on the oscillation measurement signal (s1) present during the phase control interval to ascertain at least one frequency measured value, Xf, which represents the wanted frequency for the phase control interval, as well as also with application of the frequency measured value, Xf, to generate a density measured value, Xρ, representing a density, ρ.

Abstract translation: 密度测量装置用于测量流动介质的密度ρ，并且包括测量装置电子装置（ME）以及与其电连接的测量传感器（MT）。 测量传感器包括测量管（10），用于激发和保持振荡的振荡激励器（41）和用于配准至少一个测量管的振荡的振荡传感器（51）。 测量装置电子装置通过振荡测量信号（s1）以及激励器信号（e1）进行调节，以调节影响测量管的所需振荡（即，具有预定有用频率fN的振荡）的驱动力。 调节驱动力，使得在预定的相位控制间隔期间，测量管Is的速度响应VN相对于驱动器的想要的力分量FN相移的相移角φN 力小于-20°且大于-80°，和/或有用频率具有频率值，其对应于大于1.00001倍，等于1.001倍，瞬时谐振频率的频率值 的测量管。 此外，基于在相位控制间隔期间存在的振荡测量信号（s1）来适应测量装置电子装置，以确定表示相位控制间隔的有用频率的至少一个频率测量值Xf，以及也用 应用频率测量值Xf，产生密度测量值，Xρ，表示密度ρ。