公开(公告)号：AU1544700A

公开(公告)日：2000-07-31

申请号：AU1544700

申请日：1999-12-16

Applicant: ABB RESEARCH LTD

Inventor： BOHNERT KLAUS ,  BRANDLE 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.

公开(公告)号：DE19860410A1

公开(公告)日：2000-06-29

申请号：DE19860410

申请日：1998-12-28

Applicant: ABB RESEARCH LTD

Inventor： BOHNERT KLAUS ,  BRAENDLE HUBERT

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

Abstract: The invention relates to a fibre laser pressure sensor (1) which is suitable in particular for the measurement of differential pressures and flow velocities v1 in oil boreholes. The fibre laser (2) provided for in the invention comprises two sensor fibre segments (5a, 5b) subjected to different pressures in which a double refraction proportional to the differential pressure DELTA p=p1-p2, and thus a beat frequency, are induced between the polarization modes or spatial modes in the fibre laser (2). Embodiments of the invention comprising polarimetric monomode fibres (5a, 5b) and/or elliptical dual-mode fibres (5a, 5b) are given as examples. The invention also relates to pressure-resistant multi-chamber sensor housings (25) and wavelength multiplex configurations for the fibre laser pressure sensor (1). An advantage of such a sensor is that the pressure signal is wavelength coded and thus highly insensitive to interference. Readings can be obtained directly by optic fibres over great distances separating the passive optical sensor head (1) and optoelectronic measurement device (12, 17). An application of the invention concerns the measurement of a flow velocity v1 using a Venturi tube (23).

公开(公告)号：ES2681269T3

公开(公告)日：2018-09-12

申请号：ES06721929

申请日：2006-04-25

Applicant: ABB RESEARCH LTD

Inventor： BOHNERT KLAUS ,  FRANK ANDREAS ,  BRÄNDLE HUBERT

IPC: G01R15/24

Abstract: Un procedimiento para medir una corriente que comprende las etapas de enviar ondas de luz izquierda y derecha polarizadas circularmente al menos una vez a lo largo de una fibra de detección (8) que se extiende alrededor de dicha corriente, pasar dichas ondas de luz derecha e izquierda polarizadas circularmente a través de un retardador óptico (7) para generar dos ondas de luz de retorno polarizadas linealmente ortogonalmente, enviar una primera parte de dichas ondas de luz de retorno a un primer detector (16), una segunda parte de dichas ondas de luz de retorno a un segundo detector (18), caracterizado por la etapa de enviar una tercera parte de dichas ondas de luz de retorno a un tercer detector (20), en el que dicha primera parte de dicha luz de retorno se pasa a través de un primer analizador circular (15a, 15b) antes de incidir en dicho primer detector (16), en el que dicha segunda parte de dichas ondas de luz de retorno se pasa a través de un segundo analizador circular (17a, 17b) antes de incidir en dicho segundo detector (18) y que tiene una polarización opuesta a dicho primer analizador circular (15a, 15b), y en el que dicha tercera parte de dichas ondas de luz de retorno se pasa a través de un analizador lineal (19) antes de incidir en dicho tercer detector (20), en el que dicho primer detector (16) genera una señal I+ y dicho segundo detector (18) genera una señal I- y dicho tercer detector (20) genera una señal IL, y el conocimiento de las tres señales I+, I-, IL permite obtener la corriente incluso si no se conocen de antemano los valores de visibilidad de franjas V y de potencia óptica de llegada I0.

公开(公告)号：DE112013006884T5

公开(公告)日：2015-12-17

申请号：DE112013006884

申请日：2013-03-28

Applicant: ABB RESEARCH LTD

Inventor： MÜLLER GEORG ,  BOHNERT KLAUS ,  FRANK ANDREAS ,  GU XUN

IPC: G01R15/24 ,  G01R33/032

Abstract: Ein faseroptischer Stromsensor verwendet eine stark doppelbrechende gesponnene Faser (17) als Messfaser (17). Das Licht wird durch einen Verzögerer (16) geleitet, der ein verstimmter Viertelwellen- oder Halbwellenverzögerer (16) ist. Es wird gezeigt, dass eine solche Verstimmung verwendet werden kann, um Temperaturabhängigkeiten des Messkopfes auszugleichen.

公开(公告)号：AU2009356476B2

公开(公告)日：2014-08-07

申请号：AU2009356476

申请日：2009-12-11

Applicant: ABB RESEARCH LTD

Inventor： BOHNERT KLAUS ,  FRANK ANDREAS ,  WUST ROBERT

IPC: G01R15/24 ,  G01R35/00

Abstract: A fiber-optic current sensor comprises a measurinq unit (1) including a light source (3) and a light detector (7) as well as a sensing head (2) including a sensing fiber (11) wound around a conductor (12) and a retarder (10) connected to the sensing fiber (11). The scale factor as a function of current of the fiber-optic current sensor is described by the product of two scaling functions fe' and fs' for the measuring unit (1) and the sensing head (2), respectively. The data describing the scaling functions fe', fs' is stored in a memory (22) of the measuring unit (1), while the data describing the scaling function fs' is also stored in a memory (23) of the sensing head (2). Providing two such memory devices (22, 23) allows to store the scaling functions fe' and fs' separately, thereby turning the control unit as well as the sensor head into easily replaceable modules (1, 2).

公开(公告)号：AU2009356476A1

公开(公告)日：2012-06-21

申请号：AU2009356476

申请日：2009-12-11

Applicant: ABB RESEARCH LTD

Inventor： BOHNERT KLAUS ,  FRANK ANDREAS ,  WUST ROBERT

IPC: G01R15/24 ,  G01R35/00

Abstract: A fiber-optic current sensor comprises a measurinq unit (1) including a light source (3) and a light detector (7) as well as a sensing head (2) including a sensing fiber (11) wound around a conductor (12) and a retarder (10) connected to the sensing fiber (11). The scale factor as a function of current of the fiber-optic current sensor is described by the product of two scaling functions fe' and fs' for the measuring unit (1) and the sensing head (2), respectively. The data describing the scaling functions fe', fs' is stored in a memory (22) of the measuring unit (1), while the data describing the scaling function fs' is also stored in a memory (23) of the sensing head (2). Providing two such memory devices (22, 23) allows to store the scaling functions fe' and fs' separately, thereby turning the control unit as well as the sensor head into easily replaceable modules (1, 2).

公开(公告)号：CA2801816A1

公开(公告)日：2011-12-15

申请号：CA2801816

申请日：2011-06-07

Applicant: ABB RESEARCH LTD

Inventor： WILDERMUTH STEPHAN ,  BOHNERT KLAUS ,  KOCH NORBERT ,  CZYZEWSKI JAN ,  MARCHESE SERGIO VINCENZO

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 measure the field. This design allows to produce compact voltage sensors for high voltage applications.

公开(公告)号：CA2329963C

公开(公告)日：2011-06-07

申请号：CA2329963

申请日：2000-12-29

Applicant: ABB RESEARCH LTD

Inventor： BOHNERT KLAUS ,  NEHRING JURGEN

IPC: G01R19/15 ,  G01R15/24

Abstract: In a fiber optic current sensor having a coiled sensor fiber (1) which encloses a current conductor (S), and at least one phase delay element (4, 5) adjoining the sensor fiber (1), the at least one phase delay element (4, 5) has a phase delay with a temperature dependence such that it at least approximately compensates for a temperature dependence of a Verdet's constant (V)of the sensor fiber (1). It is thereby possible to achieve an at least approximately temperature-independent sensor signal.

公开(公告)号：DE50311787D1

公开(公告)日：2009-09-17

申请号：DE50311787

申请日：2003-11-06

Applicant: ABB RESEARCH LTD

Inventor： BOHNERT KLAUS ,  GABUS PHILIPPE ,  BRAENDLE HUBERT

IPC: G02B6/44

Abstract: The high-frequency insulator (9) is shaped as a hollow cylinder with a set of circumferential insulating fins (3) on the outside. There is a large voltage difference between the upper (1) and lower (2) ends of the insulator. An optical fiber (4) is threaded through a capillary channel (5) which may run in a spiral from the upper to the lower end. The capillary channel is filled with a protective medium (6).

公开(公告)号：AT377195T

公开(公告)日：2007-11-15

申请号：AT03405641

申请日：2003-09-03

Applicant: ABB RESEARCH LTD

Inventor： BOHNERT KLAUS ,  GABUS PHILIPPE ,  BRAENDLE HUBERT

IPC: G01R15/24 ,  G01R33/032

Abstract: The sensor head (2) has a capillary (6) in which a sensor fiber is arranged. The sensor head is bendable in the region of a sensor fiber (3). Oil or powder (7) is provided in the capillary for reducing friction between the sensor fiber and the capillary. An independent claim is included for a current sensor or a magnetic field sensor.