公开(公告)号：US09945670B2

公开(公告)日：2018-04-17

申请号：US15121620

申请日：2015-02-26

Applicant: IXBLUE

Inventor： Herve Lefevre ,  Frederic Guattari ,  Cedric Molucon ,  Stephane Chouvin

IPC: G01C19/72 ,  G01B9/02

CPC classification number: G01C19/722 ,  G01B9/02 ,  G01B2290/70 ,  G01C19/726 ,  G01C19/727

Abstract: Interferometric measurement device includes a light source emitting a source signal and optical coupling elements receiving the source signal, directing part of the latter towards a measurement pathway including a Sagnac ring interferometer, of frequency fp, producing a power output signal POUT polarized according to a first polarization direction, tapping off another part of the source signal towards a compensation pathway producing a return power compensation signal PRET, and directing the output and compensation signals towards detection elements. The compensation pathway includes polarization rotation elements producing the compensation signal according to a second cross-direction of polarization, and optical looping elements redirecting part of the compensation signal towards the measurement pathway; the detection elements include a single detector connected to the coupling elements for receiving the output signal and the compensation signal; the device further includes power equilibration elements equalizing the output power and/or return power are routed towards the detector.

公开(公告)号：US09739614B2

公开(公告)日：2017-08-22

申请号：US14396823

申请日：2013-04-25

Applicant: IXBLUE

Inventor： Herve Lefevre ,  Frederic Guattari ,  Cedric Molucon ,  Eric Ducloux ,  Sebastien Ferrand

IPC: G01C19/72 ,  G01C21/00

CPC classification number: G01C19/721 ,  G01C19/726 ,  G01C21/00

Abstract: A fiber-optic measurement device (10) includes a SAGNAC ring interferometer (20) having a proper frequency fp, a detector (14) and a modulation chain (30) generating a phase-shift modulation φm(t) between the two counter-propagating waves (24, 25) propagating in the ring interferometer. The device aims to reduce measurement faults due to the linearity defects in the modulation chain of such a measurement device with optical fiber. For this reason, the fiber-optic measurement device reduces the amplitude of the phase-shift modulation φm(t) which is the sum of a first biasing phase-shift modulation component φb1(t) and a first counter-reaction phase-shift modulation component φcr1(t), the phase-shift modulation φm(t) falling or rising by twice the amplitude of the first biasing phase-shift modulation component φb1(t). A rate gyro including such a measurement device and an inertial stabilization or navigation unit including at least one such rate gyro are also described.

公开(公告)号：US10041816B2

公开(公告)日：2018-08-07

申请号：US15324967

申请日：2015-07-06

Applicant: IXBLUE

Inventor： Pascal Simonpietri ,  Stephane Chouvin ,  Cedric Molucon

IPC: G01D5/353 ,  G01D5/34 ,  G01C19/72 ,  G02B6/126 ,  G02F1/21 ,  G02B5/126

Abstract: Disclosed is an optical fiber interferometric system including a light source (1), a fiber optic coil (8), a coil splitter (3), a photodetector (2), and a polarization filtering unit. According to an embodiment, the polarization filtering unit includes a first waveguide polarizer (51), at least one second thin-plate polarizer (52) and an optical waveguide section (12), the at least one second polarizer (52) being disposed in the Rayleigh zone between a first waveguide end (21) of the first polarizer (51) and a second waveguide end (22) of the optical waveguide section (12).

公开(公告)号：US09823076B2

公开(公告)日：2017-11-21

申请号：US15023747

申请日：2014-09-23

Applicant: IXBLUE

Inventor： Frederic Guattari ,  Cedric Molucon ,  Sebastien Ferrand ,  Eric Ducloux

IPC: G01C19/72 ,  G02B6/293

CPC classification number: G01C19/728 ,  G01C19/721 ,  G02B6/29347

Abstract: An interferometric system with multi-axis optical fiber and a method for processing an interferometric signal in such a system, the multi-axis interferometric system includes a light source (1); a plurality of N optical-fiber coils (11, 12), a first optical separation element (3) capable of splitting the source beam (100) into a first split beam (140) and a second split beam (240); shared phase-modulation element (4); a photodetector (2) and a signal-processing system (800). The N optical-fiber coils (11, 12) are connected in parallel, the coils having respective transit times T1, T2, . . . TN that all differ from one another, and the signal-processing system (800) is capable of processing the interferometric signal (720) detected by the shared photodetector (2) as a function of the respective transit times in the various coils.

公开(公告)号：US09702700B2

公开(公告)日：2017-07-11

申请号：US14774540

申请日：2014-03-10

Applicant: IXBLUE

Inventor： Herve Lefevre ,  Frederic Guattari ,  Cedric Molucon ,  Joachin Honthaas ,  Eric Ducloux ,  Jean-Jacques Bonnefois

IPC: G01C19/72

CPC classification number: G01C19/727

Abstract: A fiber-optic interferometric measurement device (100) intended to measure a physical parameter (QR), includes: a wide-spectrum light source (103); a SAGNAC fiber-optic interferometer (110), in which there propagate two counter-propagating light waves (101, 102) including measurement elements (1140) sensitive to the physical parameter that results in a non-reciprocal phase difference Δφρ between the two light waves; and a detector (104) delivering an electric signal representative of the physical parameter. The measurement elements include a ring resonator (1143) in transmission mode including a first coupler (1141) and a second coupler (1142) respectively, which couple a first arm (111) and a second arm (112) respectively of the SAGNAC interferometer to the ring resonator, in such a way that the two light waves travel in opposing directions of travel (1143H, 1143AH).

公开(公告)号：US20150116723A1

公开(公告)日：2015-04-30

申请号：US14396823

申请日：2013-04-25

Applicant: IXBLUE

Inventor： Herve Lefevre ,  Frederic Guattari ,  Cedric Molucon ,  Eric Ducloux ,  Sebastien Ferrand

IPC: G01C19/72 ,  G01C21/00

CPC classification number: G01C19/721 ,  G01C19/726 ,  G01C21/00

Abstract: A fibre-optic measurement device (10) includes a SAGNAC ring interferometer (20) having a proper frequency fp, a detector (14) and a modulation chain (30) generating a phase-shift modulation φm(t) between the two counter-propagating waves (24, 25) propagating in the ring interferometer. The device aims to reduce measurement faults due to the linearity defects in the modulation chain of such a measurement device with optical fibre. For this reason, the fibre-optic measurement device reduces the amplitude of the phase-shift modulation φm(t) which is the sum of a first biasing phase-shift modulation component φb1(t) and a first counter-reaction phase-shift modulation component φcr1(t), the phase-shift modulation φm(t) falling or rising by twice the amplitude of the first biasing phase-shift modulation component φb1(t). A rate gyro including such a measurement device and an inertial stabilization or navigation unit including at least one such rate gyro are also described.

Abstract translation: 光纤测量装置（10）包括具有适当频率fp的SAGNAC环形干涉仪（20），在两者之间产生相移调制（m）的调制链（30），检测器（14）和调制链（30） 反向传播波（24,25）在环形干涉仪中传播。 该装置旨在减少由于光纤测量装置的调制链中的线性缺陷引起的测量故障。 因此，光纤测量装置减小相移调制的幅度，m（t）是第一偏置相移调制分量b1（t）和第一反相 相移调制分量＆phgr; cr1（t），移相调制＆mgr（t）下降或上升是第一偏置相移调制分量的幅度b1（t）。 还描述了包括这种测量装置的速率陀螺仪和包括至少一个这种速率陀螺仪的​​惯性稳定或导航单元。

公开(公告)号：US09823417B2

公开(公告)日：2017-11-21

申请号：US15324781

申请日：2015-07-06

Applicant: IXBLUE

Inventor： Pascal Simonpietri ,  Stephane Chouvin ,  Cedric Molucon

IPC: G02B6/27 ,  G02B6/126 ,  G02B5/30 ,  G02B6/024 ,  G02B6/30

CPC classification number: G02B6/2706 ,  G01D5/35322 ,  G02B5/3033 ,  G02B6/024 ,  G02B6/126 ,  G02B6/2726 ,  G02B6/2766 ,  G02B6/30

Abstract: Disclosed is a waveguide polarizing optical device, including a first waveguide polarizer (6), a section of a second optical waveguide (31) and a second thin-plate polarizer (52) having a physical thickness T and a refractive index n, the second thin-plate polarizer (52) being disposed on the optical path between a waveguide end (8) of the first polarizer (6) and one end (32) of the second optical waveguide (31), the physical distance d between the waveguide end (8) of the first polarizer (6) and the end (32) of the second optical waveguide (31) being less than or equal to twice the Rayleigh length and the physical thickness T of the second polarizer (52) being less than or equal to the physical distance d.