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公开(公告)号：NO20013221D0
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
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.
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公开(公告)号：AU5385800A
公开(公告)日：2001-03-19
申请号：AU5385800
申请日：2000-07-05
Applicant: ABB RESEARCH LTD
Inventor： BOHNERT KLAUS , BRANDLE HUBERT
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公开(公告)号：DE19938978A1
公开(公告)日：2001-02-22
申请号：DE19938978
申请日：1999-08-19
Applicant: ABB RESEARCH LTD
Inventor： BOHNERT KLAUS , BRAENDLE HUBERT
Abstract: The sensor has an optical fibre (1) with at least two fibre-Bragg grids )10, 11) and a pressure transfer element (2) with a pressure body (3) and a reference body (4), to which the optical fibre is connected. The pressure transfer element converts the pressure of a medium into a longitudinal expansion or compression of at least one section of the optical fibre contg. a fibre-Bragg grid. The fibre-Bragg grids are arranged to have an approximately equal gas sensitivity and thermally induced displacements of the Bragg wavelength of at least two grids have a predefined mutual relationship.
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公开(公告)号：AU1502600A
公开(公告)日：2000-07-31
申请号：AU1502600
申请日：1999-12-16
Applicant: ABB RESEARCH LTD
Inventor： BOHNERT KLAUS , BRANDLE HUBERT
IPC: G01L11/02
Abstract: The subject matter of the present invention is a fiber Bragg grating sensor 1, 25 which is suitable, in particular, for measuring differential pressures and flow rates v1 in oil drill holes. The sensor principle according to the invention is based on using a transducer 1 with two pressure chambers 7a, 7b to convert a hydrostatic pressure difference between two liquid or gaseous media 11a, 11b into a longitudinal fiber elongation or fiber compression and measuring it via the displacement of the Bragg wavelength DeltalambdaB of at least one fiber Bragg grating 3, 4. Exemplary embodiments are specified which have two fiber Bragg gratings 3, 4 which are sensitive to elongation in opposite senses and which have temperature-compensating transducers 1, and which have a plurality of transducers 1 in a wavelength-division-multiplexing configuration. One embodiment relates to measuring a flow rate v1 with the aid of a venturi tube 23.
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公开(公告)号：AU1746999A
公开(公告)日：1999-09-15
申请号：AU1746999
申请日：1999-01-14
Applicant: ABB RESEARCH LTD
Inventor： BOHNERT KLAUS , BRANDLE HUBERT
Abstract: The invention relates to a frequency-coded fiber laser pressure sensor (1) which is especially suitable for measuring isotropic pressures in oil wells. The sensor principle provided for in the invention is based on the fact that in a fiber laser (2) doped with Er a monomode or bimodal sensor fiber (5, 5a, 5b) is positioned whose pressure-related birefraction results in a frequency shift and beat frequencies between the orthogonal linear polarisation modes x, y or the spatial modes LP01 and LP11 line. The beat frequencies are easily measured using a frequency counter (19). Temperature-related variations in birefraction are compensated in a differential arrangement of two sensor fiber segments (5a, 5b). Fiber-integrated Bragg gratings (4a, 4b) with low bandwidths (0.2 nm) are especially suitable as laser end reflectors. The pressure sensor (1) is characterized by a large measurement range (100 Mpa) and a high triggering capacity , (kPa), is readily multiplexed and can be housed in a very compact, light-weight and robust pressure-resistant housing (25).
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Patent Agency Ranking
公开(公告)号：ZA953289B
公开(公告)日：1996-01-11
申请号：ZA953289
申请日：1995-04-24
Applicant: ABB RESEARCH LTD
Inventor： BOHNERT KLAUS , NEHRING JUERGEN
Abstract: The HV measuring system uses an electrooptical sensor, with an electrooptical crystal (4), exhibiting a phase shift in the light in dependence on the applied HV (8). The crystal is supplied with a linearly polarised input beam, with a given polarisation angle relative to the electrooptical axis of the crystal, with detection of 2 back reflected partial beams (T1, T2) provided by a polarisation analyser (1) with a given relative phase shift provided by a quater wavelength plate, via respective photodetectors (D1, D2). Pref. the polarisation angle of the input light beam is between 30 and 60 degrees.
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公开(公告)号：AU2013285419A1
公开(公告)日：2015-01-22
申请号：AU2013285419
申请日：2013-07-04
Applicant: ABB RESEARCH LTD
Inventor： MULLER GEORG , FRANK ANDREAS , BOHNERT KLAUS , GU XUN
Abstract: In a fiber-optic current sensor, a 22.5° Faraday rotator,which is part of the sensing fiber coil,determines the working point of the sensor. The coil is operated with substantially linearly polarized light or incoherent substantially left and right circularly polarized light waves. In one arrangement, a polarization beam splitter generates two optical signals that vary in anti-phase with changing current. A signal processor determines the current from the two anti-phase signals. Appropriately detuned and oriented fiber-optic half-wave or quarter-wave retarders before the fiber coil are used to reduce or cancel the adverse effects of temperature and bend-induced birefringence on the measurement signal. Moreover, the temperature may be derived from the difference in the bias of the anti-phase signals and may be used to cancel temperature effects in the signal processor.
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公开(公告)号：AU2011264004B2
公开(公告)日：2014-02-13
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.
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公开(公告)号：ES2387042T3
公开(公告)日：2012-09-12
申请号：ES07787245
申请日：2007-07-09
Applicant: ABB RESEARCH LTD
Inventor： KRAMER AXEL , BOHNERT KLAUS , BRAENDLE HUBERT , KASSUBEK FRANK
Abstract: Sensor de presión (18) con al menos un elemento de detección óptico (10) los cambios inducidos por presión enlas propiedades birrefringentes que se leen por la transmisión del al menos un haz de luz (2, 21), caracterizado porqueel sensor de presión (18) comprende al menos un cuerpo transparente de un solo material (10) que se somete a almenos dos presiones diferentes (p1, p2) en al menos dos regiones distintas a través de al menos dos cámaras depresión (8, 9), en el que el cuerpo transparente (10) se está transmitiendo por un haz de luz paralelo oesencialmente no-divergente o mínimamente divergente sin reflexión total en dicho cuerpo (10) de tal manera que elcambio de fase inducido por la birrefringencia del haz de luz transmitido (22) depende de la diferencia de laspresiones aplicadas (p1, p2),el cuerpo transparente (10) está dispuesto en una carcasa exterior (5), proporcionándose las cámaras de presión (8,9) en el espacio intermedio entre la superficie exterior del cuerpo transparente (10) y la superficie interior de lacubierta exterior (5), y la cubierta exterior (5) está fabricada de acero, en el que el acero se seleccionapreferiblemente para tener una característica de expansión térmica esencialmente igual o similar a la del cuerpotransparente (10).
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公开(公告)号：AT532076T
公开(公告)日：2011-11-15
申请号：AT09171889
申请日：2009-09-30
Applicant: ABB RESEARCH LTD
Inventor： WUEEST ROBERT , FRANK ANDREAS , BOHNERT KLAUS
IPC: G01R15/24 , G01R33/032
Abstract: A fiber optic current or magnetic field sensor uses a sensing fiber (5) in a coil for measuring a current or a magnetic field and has a retarder (4) for converting between linearly polarized light and elliptically polarized light The retardation of the retarder, its temperature dependence as well as its azimuth angle in respect to the plane of the fiber coil are optimized in dependence of the birefringence in the sensing fiber (5) in order to minimize the influence of temperature variations and manufacturing tolerances on the overall scale factor of the sensor.
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