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：US09766070B2

公开(公告)日：2017-09-19

申请号：US14653330

申请日：2013-12-12

Applicant: IXBLUE

Inventor： Joachin Honthaas ,  Herve Lefevre ,  Eric Ducloux ,  Jean-Jacques Bonnefois

IPC: G01C19/72 ,  G01C19/64

CPC classification number: G01C19/64

Abstract: An interferometric measurement device includes a broad-spectrum spontaneous emission light source; a measurement interferometer, receiving a light signal with input light power and delivering a modulated light signal with output light power, the modulated light signal being modulated at a modulation frequency, depending on a physical parameter to be measured and being proportional to the input light power; an optical radiation detector, receiving the modulated light signal exiting from the measurement interferometer and delivering a modulated electrical signal representative of the output light power; a filtering interferometer, insensitive to the physical parameter to be measured, having a free spectral range ISL and a finesse F selected such that an interval of frequencies, centerd around an optimal frequency foptim equal to (2k+1)ISL/2, k being a natural number, and of width Δf equal to [0.9−(3/2F)]ISL, includes the modulation frequency of the modulated light.