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    12.
    发明专利
    未知

    公开(公告)号：NO20013221L

    公开(公告)日：2001-06-27

    申请号：NO20013221

    申请日：2001-06-27

    Applicant: ABB RESEARCH LTD

    Inventor： BOHNERT KLAUS ,  BRAENDLE HUBERT

    IPC: G01F1/44 ,  G01L1/24 ,  G01L11/02

    Abstract: The present invention relates to a fiber laser pressure sensor 1 which is suitable in particular for measuring differential pressures and flow velocities v1 in oil boreholes. The fiber laser 2 according to the invention comprises two sensor fiber segments 5a, 5b subjected to different pressure loading, in which segments a birefringence proportional to the differential pressure DELTAp=p1-p2, and consequently a beat frequency, is induced between the polarization modes or spatial modes in the fiber laser 2. Exemplary embodiments with polarimetric monomode fibers 5a, 5b and/or with elliptical two-mode fibers 5a, 5b are specified. Furthermore, pressure-resistant multichamber sensor housings 25 and wavelength division multiplex arrangements are disclosed for the fiber laser pressure sensor 1. One advantage is that the pressure signal is wavelength-coded and thus highly insensitive to interference. It can be read out directly fiber-optically over large distances between the passively optical sensor head 1 and the optoelectronic measuring device 12, 17. One application concerns the measurement of a flow velocity v1 with the aid of a Venturi tube 23.

    14.
    发明专利
    未知

    公开(公告)号：DE19860409A1

    公开(公告)日：2000-06-29

    申请号：DE19860409

    申请日：1998-12-28

    Applicant: ABB RESEARCH LTD

    Inventor： BOHNERT KLAUS ,  BRAENDLE HUBERT

    IPC: G01L11/02

    Abstract: The invention relates to a fibre Bragg-grating sensor (1, 25) which is suitable notably for the measurement of differential pressures and flow velocities v1 in oil boreholes. The operating principle of the sensor provided for in the invention is based on the fact that by means of a transducer (1) having two pressure chambers (7a, 7b) a hydrostatic pressure difference between two liquid or gaseous media (11a, 11b) is converted into a longitudinal fibre expansion or compression and measured via the displacement in the Bragg wavelength DELTA lambda B of at least one fibre Bragg grating (3, 4). Embodiments of the invention consisting of sensors comprising two fibre Bragg gratings (3, 4) having opposite expansion characteristics, temperature-compensated transducers (1) and a plurality of transducers (1) in wavelength multiplex configuration are given as examples. One application of the invention is the measurement of a flow velocity v1 using a Venturi tube (23).

    Bobina de detección de fibra óptica y sensor de corriente o de campo magnético
    15.
    发明专利
    Bobina de detección de fibra óptica y sensor de corriente o de campo magnético 未知

    公开(公告)号：ES2634507T3

    公开(公告)日：2017-09-28

    申请号：ES05729365

    申请日：2005-04-21

    Applicant: ABB RESEARCH LTD

    Inventor： BOHNERT KLAUS ,  GABUS PHILIPPE ,  NEHRING JUERGEN ,  BRÄNDLE HUBERT

    IPC: G01R15/24

    Abstract: Cabeza de sensor de fibra óptica (2) para un sensor óptico de corriente o de campo magnético (1), que comprende una fibra óptica, que contiene una fibra de sensor (3) activa de manera magneto-óptica conectada de manera óptica con al menos un elemento (4; 5) de definición de polarización, siendo flexible la cabeza de sensor (2) en la zona de la fibra de sensor (3), pudiendo disponerse la fibra de sensor (3) alrededor de un conductor (L) que conduce la corriente que va a medirse o en un campo magnético que va a medirse en forma de una bobina (8), estando definido a través de la bobina (8) un plano de bobina (A) con una normal de superficie (Ns), presentando el al menos un elemento (4; 5) de definición de polarización un eje marcado (f), y estando presente un medio de ajuste (10) para el ajuste de un ángulo que puede predeterminarse entre el eje marcado (f) y la normal de superficie (Ns) o para el ajuste de ángulos que pueden predeterminarse ß,ß' entre los ejes marcados (f) y la normal de superficie (Ns), incluyendo además el medio de ajuste (10) un cuerpo de soporte (11), en el que está fijado el al menos un elemento de definición de polarización (4; 5), caracterizada por que la fibra de sensor (3) es una fibra no tratada térmicamente a al menos la temperatura de reblandecimiento del material de fibra de sensor, la fibra de sensor (3) está liberada de su envoltura de fibra, la fibra de sensor (3) está montada en un capilar (6), el capilar (6) incluye un medio para reducir la fricción (7) y el cuerpo de soporte (11) es un cuerpo de soporte que puede deformarse de manera flexible (11).

    High-voltage sensor with axially overlapping electrodes and local field sensors
    16.
    发明专利
    High-voltage sensor with axially overlapping electrodes and local field sensors 未知

    公开(公告)号：AU2011264004A1

    公开(公告)日：2013-01-10

    申请号：AU2011264004

    申请日：2011-04-07

    Applicant: ABB RESEARCH LTD

    Inventor： ERIKSSON GORAN ,  BOHNERT KLAUS ,  MARCHESE SERGIO VINCENZO ,  WILDERMUTH STEPHAN

    IPC: G01R15/24

    Abstract: A voltage sensor comprises an insulator (1) with mutually insulated electrodes (Eij, Es) embedded therein. The electrodes are coaxial and cylindrical and overlap axially along part of their lengths. They are mutually staggered and control the surfaces of electric equipotential such that there is a substantially homogeneous electric field outside the insulator (1) and a substantially homogeneous but higher field within a sensing cavity (7) within the insulator (1). A field sensor (6) is arranged within the sensing cavity (7) to locally measure the field. This design allows to produce compact voltage sensors for high voltage applications.

    20.
    发明专利
    未知

    公开(公告)号：AT349706T

    公开(公告)日：2007-01-15

    申请号：AT00811132

    申请日：2000-11-28

    Applicant: ABB RESEARCH LTD

    Inventor： BOHNERT KLAUS ,  NEHRING JUERGEN

    IPC: G01R15/24

    Abstract: The current sensor has a sensor fibre (1) wound in a coil around the outside of a current conductor (S) in a Sagnac or reflexion interferometer configuration and coupled to at least one phase delay element (4,5), providing a temperature-dependent phase delay for compensating the temperature dependency of the Verdet constant of the sensor fibre.

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