公开(公告)号：US20250102304A1

公开(公告)日：2025-03-27

申请号：US18576958

申请日：2022-07-07

Applicant: EXAIL ,  CENTRE NATIONAL D'ETUDES SPATIALES

Inventor： Eric DUCLOUX

IPC: G01C19/72

Abstract: This relates to an interferometer including a light generator, a fibre-optic coil, an optical coupler/splitter, a photodetector and an electronic signal-processing system. The light generator includes a laser source able to emit a source beam split into two secondary beams passing through the coil with a travel time τ defining a natural frequency f p = 1 2 ⁢ τ . According to the invention, the laser source is a monofrequency laser source and the light generator includes modulation means designed to modulate the source beam at a modulation frequency equal to 2 ⁢ f p 2 ⁢ n + 1 where n is an integer greater than or equal to 1, and the photodetector and the electronic signal-processing system are configured to acquire and process a signal representative of the interference beam at a demodulation frequency equal to f p 2 ⁢ n + 1 .

公开(公告)号：US20240167818A1

公开(公告)日：2024-05-23

申请号：US18548849

申请日：2022-03-03

Applicant: EXAIL ,  CENTRE NATIONAL D'ETUDES SPATIALES

Inventor： Eric DUCLOUX ,  Louis LHOMME ,  Nicolas GROSSARD ,  Jérôme HAUDEN

IPC: G01C19/72

CPC classification number: G01C19/721

Abstract: Disclosed is a method for reducing the Kerr effect in an interferometry measuring device including a generator configured to emit an input periodic light signal, and a Sagnac interferometer in which two counterpropagating signals travel and combine so as to form a periodic output signal having at least two power values, the method including: determining a phase shift between the two counterpropagating signals a first time, and cancelling out the phase shift; and then determining a phase shift between the two counterpropagating signals a second time; and adjusting the ratio between the average powers of the counterpropagating signals so as to cancel out the value of the phase shift determined in the second determination. Also disclosed is an interferometry measuring device configured to implement such method.

公开(公告)号：US20240159537A1

公开(公告)日：2024-05-16

申请号：US18548842

申请日：2022-03-03

Applicant: EXAIL ,  CENTRE NATIONAL D'ETUDES SPATIALES

Inventor： Eric DUCLOUX ,  Christophe OLLIVIER

IPC: G01C19/72 ,  G02F1/01 ,  G02F1/21

CPC classification number: G01C19/721 ,  G02F1/0123 ,  G02F1/211 ,  G02F2203/50

Abstract: Disclosed is a generator for generating an anti-Kerr modulated light signal, including a primary light source having four longitudinal modes or fewer and configured to generate a light signal and a modulator configured to modulate the power of the light signal by way of a square-wave or rectangular-wave control signal the duty cycle of which is less than or equal to 50%, and which are adapted such that the modulated light signal is periodic and has: —at a first point of the signal, a first power value equal to the product of its average power and a gain between 1.6 and 2.4; —at a second point of the signal, a second, non-zero power value, that is different from the first power value. Also disclosed is a modulation method and to a measuring device.

公开(公告)号：US20240264376A1

公开(公告)日：2024-08-08

申请号：US18566872

申请日：2022-06-02

Applicant: EXAIL SAS

Inventor： Eric DUCLOUX ,  Adrien STEIB ,  Thomas VILLEDIEU

IPC: G02B6/255 ,  G01C19/72

CPC classification number: G02B6/2555 ,  G01C19/721

Abstract: This relates to a fiber-optic polarization orienting and filtering device including a first single-mode optical fiber, having a downstream end, and a polarizing optical fiber, having a first end and a second end, characterized in that the device further includes: a first rigid opto-mechanical linking region connecting the downstream end of the first single-mode optical fiber and the first end of the polarizing optical fiber along a first linking axis; and an orientation adjusting system, the system being suitable for adjusting the angular position of the first linking region about the first linking axis.