公开(公告)号：EP2844882A1

公开(公告)日：2015-03-11

申请号：EP13728000.4

申请日：2013-04-29

申请人： Techni AS

发明人： PETERSEN, David, Christian ,  BENDIKSEN, Jan, Martin ,  SCHMEDLING, Petter, F. ,  KARLSEN, Morten, Roll ,  EISENTRÄGER, Roland ,  KOLLE, Audun, G.

IPC分类号： F15B15/28 ,  F15B19/00 ,  G01D5/48 ,  G01D5/62

CPC分类号： F15B19/00 ,  F15B15/2884 ,  F15B19/005 ,  G01D5/48 ,  G01N29/07 ,  G01N29/2412 ,  G01N2291/0258 ,  G01N2291/044 ,  G01S15/02

摘要： A system for measuring the position of a rod element as, for example, a hydraulically or pneumatically operated piston rod. Unlike the prior art, the system according to the present invention employs a measuring principle that does not require preparatory treatment of the rod element as is required in the known solutions. The system employs direct time of flight measurements with the aid of acoustic surface waves that are introduced into the rod element. The instrument is retrofittable on existing cylinders without any modification/reconstruction thereof. An EMAT principle is employed to introduce the surface waves into the measurement in a non-contact manner.

公开(公告)号：EP2676129A1

公开(公告)日：2013-12-25

申请号：EP12710151.7

申请日：2012-02-16

申请人： Techni AS

发明人： BORGEN, Harald ,  PETERSEN, David, Christian ,  SCHMEDLING, Petter, F. ,  BORNSTEIN, Marius ,  SJULSTAD, Trond ,  KARLSEN, Morten, Roll ,  TARANRØD, Andreas, Bjerknes ,  BENDIKSEN, Jan, Martin ,  BRANDSÆTER, Tor, Helge

IPC分类号： G01N29/024 ,  G01N29/036 ,  G01N29/32 ,  G01K11/22

CPC分类号： G01N29/024 ,  G01K11/22 ,  G01L11/06 ,  G01L19/0092 ,  G01N29/036 ,  G01N29/323 ,  G01N29/326 ,  G01N2291/02872 ,  G01N2291/02881

摘要： The present invention relates to system for measuring pressure and temperature based on change in the characteristic properties of a medium for ultrasound under the effect of pressure and temperature. The invention is based on two waveguides where geometry is adapted to the medium's characteristic properties for ultrasound such that only planar pressure waves are generated in the waveguides. The first of the waveguides is arranged for measuring temperature due to thermal expansion of the medium, where the medium is pressure-compensated by means of an internal compensator to prevent thermal pressure accumulation, and where measuring temperature is based on the medium's specific known characteristic data for ultrasound under the effect of temperature under constant pressure. The second waveguide is arranged for measuring pressure, based on waveguide and the medium's known characteristic properties for thermal expansion and pressure, and where the thermal effect is corrected analytically based on measurement of temperature in the first channel. The physical principle of the invention is based on the properties of a medium (oil) where the stability for high temperature and pressure is crucial for long-term properties. Long-term properties of ultrasound sensors are not physically linked to the medium's properties, such that change in characteristic properties of ultrasound sensors does not impair the accuracy of the medium unless the function of the ultrasound sensors ceases. The physical principle of the invention allows an arrangement where ultrasound sensors can be separated from measuring channels by a pressure barrier, such that the integrity of the pressure barrier is not broken.