公开(公告)号：EP0104932A3

公开(公告)日：1986-02-05

申请号：EP83305757

申请日：1983-09-27

Applicant: AGENCY OF INDUSTRIAL SCIENCE AND TECHNOLOGY ,  HOYA CORPORATION

Inventor： Yoshimasa, Fujii Fujimi-sou No. H ,  Yoshinobu, Mitsuhashi ,  Osamu, Koike c/o Hoya Corporation

IPC: G01J09/02 ,  G01D05/26

CPC classification number: G01D5/344 ,  G01J9/02 ,  Y10S359/90

Abstract: In an optical fiber system comprising first and second polarization-maintaining fibers (41. 42), a first orthogonal coordinate of the first polarization-maintaining fiber is azimuthally rotated relative to a second orthogonal coordinate of the second polarization-maintaining fiber by the use of an optical coupler (40) by a preselected angle between 0° and 90°, both exclusive. Preferably, the optical coupler is shorter than a beat length of each fiber and the preselected angle is equal to 45°. The optical fiber system is applicable to an optical sensor for sensing a variable physical parameter. In the sensor, a light beam is incident onto one end of the first polarization-maintaining fiber so that a plane of polarization of the light beam is matched to one of those planes of the first polarization-maintaining fiber which are determined by the first orthogonal coordinate. A third polarization-maintaining fiber is coupled through an additional optical coupler to the second polarization-maintaining fiber. The optical fiber system can be manufactured either by twisting and locally fusing a single polarization-maintaining fiber or by splicing two polarization-maintaining fibers.

公开(公告)号：EP0085174A3

公开(公告)日：1986-01-02

申请号：EP82111730

申请日：1982-12-17

Applicant: Bodenseewerk Gerätetechnik GmbH

Inventor： Valentin, Ernst, Dr.rer.nat.

IPC: G02B27/58 ,  G01J09/02

CPC classification number: G01J9/02 ,  G02B27/58

公开(公告)号：EP0092367A3

公开(公告)日：1984-08-01

申请号：EP83302058

申请日：1983-04-13

Applicant: THE BOARD OF TRUSTEES OF THE LELAND STANFORD JUNIOR UNIVERSITY

Inventor： Shaw, Herbert John

IPC: G01J09/02 ,  G01H09/00 ,  G01D05/26

CPC classification number: G01D5/35303 ,  G01H9/004 ,  G01J9/02 ,  G01J2009/0226

Abstract: A closed loop optical fiber interferometer is used in sensing a quantity, Q, by applying a time varying or modulated measure of, Q, asymmetrically to the closed loop (24) and detecting phase shift between two counterpropagating optical signals in the closed loop. The closed loop (24) can be used as the sensing element or a separate sensor (68, 70) can develop a time varying signal which is then applied to the closed loop interferometer.

公开(公告)号：EP0213778A3

公开(公告)日：1988-05-04

申请号：EP86306010

申请日：1986-08-04

Applicant: THE GENERAL ELECTRIC COMPANY, p.l.c.

Inventor： Boucouvalas, Anthony Christos ,  Georigiou, George Antony

IPC: G01D05/26 ,  G02F01/21 ,  G02B06/18 ,  G02B06/26 ,  G01J09/02

CPC classification number: G02B6/29352 ,  G01D5/35303 ,  G02B6/2821 ,  G02B6/2835

Abstract: A Mach Zehnder interferometer comprises a single optical fibre incorporating two coaxially disposed waveguides (1, 2), e.g. a rod waveguide (1) and a surrounding tube waveguide (2), and having a pair of axially spaced tapered regions forming couplers between the two waveguides at said regions.

Abstract translation: 马赫曾德尔干涉仪包括单个光纤，其中包含两个同轴布置的波导（1,2），例如， 杆波导（1）和周围管波导（2），并且具有在所述区域处的两个波导之间形成耦合器的一对轴向间隔开的锥形区域。

公开(公告)号：EP0165816A3

公开(公告)日：1986-08-13

申请号：EP85304410

申请日：1985-06-20

Applicant: PENLON LIMITED

Inventor： Davies, William ,  Hahn, Clive E.W. ,  Jackson, Roy K. ,  McGraghan, Thomas A. ,  Palayiwa, Eileen ,  Sugg, Basil R.

IPC: G01N21/45 ,  G01J09/02

CPC classification number: G01N21/45 ,  G01N2201/1245

Abstract: An apparatus and method for analysing a gas of the kind adapted to produce an interference pattern displacements of which are indicative of changes of the constitution of the gas involves exposing an array 8 of photosensitive elements to the interference pattern. Respective digital indications of the intensity of the interference pattern falling on the elements are produced by means of a timing circuit 16 adapted to clock data out of the array 8 as a series of analogue pulses which are held by a fast peak detector 17 and converted by an analogue-to-digital converter 18 into digital indications. The position of a principal peak of the interference pattern is then determined by means of a microprocessor (not shown) adapted to determine the best fit of the digital indications with appropriate pre-stored values.

公开(公告)号：EP0130337A3

公开(公告)日：1985-12-27

申请号：EP84105748

申请日：1984-05-21

Applicant: International Business Machines Corporation

Inventor： Johnson, Mark

IPC: G01J09/02

CPC classification number: G01J9/02 ,  G01D5/268 ,  G01J3/0205 ,  G01J3/021 ,  G01J2009/0226 ,  G01N21/45

Abstract: An interferometer has an input optical fiber (80) which emits a divergent laser beam (64) across the interferometric cavity (52). At the far side of the cavity the beam is reflected by a retroreflective member (10) coated with microspheres or microprisms, to that the beam (66) converges and falls partly on the end face of an output optic fiber (82) without need for precise positioning of the member (10). Also some light from the fiber (80) is reflected by transparent plate into fiber (82), so that optical interference occurs and is measured by light detector (72).

公开(公告)号：EP0193742A3

公开(公告)日：1988-08-03

申请号：EP86101421

申请日：1986-02-04

Applicant: HITACHI, LTD.

Inventor： Tatsuno, Kimio ,  Tsunoda, Yoshito ,  Ohtake, Masatoshi ,  Kataoka, Keiji ,  Yonezawa, Seiji

IPC: G01J09/02 ,  G01J03/45

CPC classification number: G01J9/04 ,  G01J3/45

Abstract: in a laser diode heterodyne interferometry, a light beam from a laser diode (1) is divided in two, one of which is used as a reference beam and the other of which is used as an inspecting beam, and the two beams are projected again on an identical plane so as to form an interference pattern. The injection current of the laser diode (1) is modulated to scan the interference pattern, and a photocurrent obtained from each element of a photosensor array (6) which receives an intensity variation of the interference pattern is divided by a monitored current of a light output of the laser diode (1), to obtain a photocurrent signal of normalized interference pattern intensity variation.

公开(公告)号：EP0135003A3

公开(公告)日：1985-12-27

申请号：EP84108137

申请日：1984-07-11

Applicant: THE PERKIN-ELMER CORPORATION

Inventor： Amodeo, Ralph ,  Krohn, William

IPC: G01J09/02

CPC classification number: G01J9/02 ,  G02F1/216

Abstract: The present invention is directed to an improved unequal path interferometer which is a particularly adapted, among many other possible uses, for detecting coherent radiation in the presence of non-coherent ambient radiation, which comprises an unequal optical path length interferometer of the type in which portions of the radiation impinging on the interferometric component are caused to be recombined after travelling two different optical paths; the optical paths differing in length by an amount substantially greater than the coherence length of the non-coherent radiation but substantially less than the coherence length of the coherent radiation; the unequal optical path length interferometric component comprising a liquid crystal cell having dielectric anisotropic properties; elements for applying a time varying electric field vector to the liquid crystal cell to vary the effective index of refraction of the liquid crystal cell in a preselected systematic manner; and elements for detecting the intensity of the recombined portions and producing a signal representative thereof, said signal having a variable component caused by the varying constructive and destructive interference of the recombined coherent radiation components, while the recombined non-coherent radiation components produce only a substantially steady background signal.

公开(公告)号：EP0094709A3

公开(公告)日：1984-04-25

申请号：EP83200651

申请日：1983-05-06

Applicant: N.V. Philips' Gloeilampenfabrieken

Inventor： Dil, Jan Gerard ,  van Hijningen, Nicolaas C. J. A.

IPC: H01S03/13 ,  G01J09/02

CPC classification number: G01J9/02 ,  H01S3/1392

Abstract: According to the invention, in a laser device the effective wave length of which is stabilized, the Fabry-Perot interferometer (15) which forms an effective wave length etalon is also used as a mode selector so that a simple, cheap multimode He-Ne laser can be used. Such a laser device can very readily be used in interferometers.

公开(公告)号：WO1993022637A1

公开(公告)日：1993-11-11

申请号：PCT/AT1993000075

申请日：1993-05-03

Applicant: TABARELLI, Werner ,  LAZECKI, René

Inventor： TABARELLI, Werner

IPC: G01J09/02

CPC classification number: G02B6/29358 ,  G01B9/0205 ,  G01B9/02061 ,  G01B9/02081 ,  G01B2290/70 ,  G01J9/02 ,  G02B6/2817

Abstract: An interferometer with an interferometer head (5) to which laser light is taken from a laser light source is taken by a flexible optical fiber (3). The head (5) has a beam divider (8) to divide the laser light into a measuring beam and a reference beam and a recombination device at which the measuring beam taken over a variable distance and the reference beam taken over a fixed reference distance interfere to form optical interference signals. The interferometer has a bearer unit (22) which can be secured to the head (5) and on which the ends of optical fibres (20a-d) and at least one polarisation beam divider (23) are secured in a fixed spatial arrangement. Optical interference signals (13, 14) from the recombination device (12) are distributed to the optical fibres (10a-d) via the polarisation beam divider (23).