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公开(公告)号：CA2019950A1
公开(公告)日：1990-12-27
申请号：CA2019950
申请日：1990-06-27
Applicant: CSELT CENTRO STUDI LAB TELECOM
Inventor： GREGO GIORGIO
IPC: G01D5/26
Abstract: The system uses a monochromatic radiation source (1) and an acousto-optic modulator (2), which acts as a Bragg modulator and is driven by a frequency which is caused to periodically vary. The modulator emits a first beam having the same wavelength as the source and a second beam, whose wavelength and emission direction vary with the modulating frequency and which is collimated. For measuring angular displacements, the collimated beam is recombined with the first beam after traversing a plate (5) with parallel and plane faces integral for the rotation with a moving device, in and a photodetector (12) generates a beat signal whose frequency depends on the angular position of the plate (5). For measuring linear displacements, the two beams are directly sent onto a detector (12) integral with the moving device.
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公开(公告)号：NO157355C
公开(公告)日：1988-03-02
申请号：NO822345
申请日：1982-07-05
Applicant: CSELT CENTRO STUDI LAB TELECOM
Inventor： GREGO GIORGIO
IPC: C03B37/025 , G01B7/12 , G01B7/04
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公开(公告)号：CA1231693A
公开(公告)日：1988-01-19
申请号：CA453049
申请日：1984-04-27
Applicant: CSELT CENTRO STUDI LAB TELECOM
Inventor： GREGO GIORGIO
Abstract: A drum for winding optical fibres consists of an envelope of an airtight plastic material having a certain degree of resiliency. The envelope defines an internal chamber maintained at a pressure somewhat higher than ambient, presents centering recesses permitting engagement with a drive spindle, and is equipped with a valve for varying the pressure inside the chamber so as to adjust the tension in the wound fibre.
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14.发明专利
公开(公告)号：DE3374216D1
公开(公告)日：1987-12-03
申请号：DE3374216
申请日：1983-02-07
Applicant: CSELT CENTRO STUDI LAB TELECOM
Inventor： COPPA GIANNI , GREGO GIORGIO
Abstract: The invention is based on phase difference measurements. A Zeeman effect laser (3) generates a light beam (4) containing two radiations with slightly different frequencies whose beat is generated at the end of a path external to the material (1, 2a, 101). The same beam is split into the two component radiations (4c, 4d); the beats are generated between the first radiation, which is made to follow a path outside the material, and two radiations obtained by making the second radiation follow two different paths inside the material. The phase differences of these two beats with respect to the first are measured by a phase-comparison system (20, 21), and the refractive-index values as well as the thickness values are obtained by suitable computing means.
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公开(公告)号：IT1182639B
公开(公告)日：1987-10-05
申请号：IT6791185
申请日：1985-10-29
Applicant: CSELT CENTRO STUDI LAB TELECOM
Inventor： COCITO GIUSEPPE , GREGO GIORGIO , MODONE EROS
IPC: C03B37/012 , G02B6/00 , C03B37/018 , G02B6/024 , G02F
Abstract: The method allows fabrication of optical fibres with noncircular core cross-section, with CDV technique, thanks to varying-thickness layer deposition along the internal perimeter of each section of the reaction tube wherein the fibre materials are deposited during preform fabrication.
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Patent Agency Ranking
公开(公告)号：IT1171040B
公开(公告)日：1987-06-10
申请号：IT6817283
申请日：1983-11-10
Applicant: CSELT CENTRO STUDI LAB TELECOM
Inventor： GREGO GIORGIO
Abstract: The device consists of a transparent container, partly filled with a ferromagnetic fluid surrounding a bubble of a transparent liquid. By an external magnetic field the ferromagnetic fluid is displaced within the container and moves the bubble making it pass between a light source and a light sensitive element.
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公开(公告)号：IT8368173D0
公开(公告)日：1983-11-10
申请号：IT6817383
申请日：1983-11-10
Applicant: CSELT CENTRO STUDI LAB TELECOM
Inventor： GREGO GIORGIO
Abstract: The connector ensures the alignment between the two fibres ends (9, 10) thanks to the force exerted by a locally generated magnetic field (5, 6, 7, 8) on a ferromagnetic fluid placed between the side fibre surface and a small tube (1) with a diameter greater than fibre diameter.
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公开(公告)号：IT8267150D0
公开(公告)日：1982-02-10
申请号：IT6715082
申请日：1982-02-10
Applicant: CSELT CENTRO STUDI LAB TELECOM
Inventor： GREGO GIORGIO
Abstract: A body transparent to laser radiation, such as an optical fiber or a preform thereof, is transluminated by a monochromatic beam of a frequency in the THz range split off from a composite laser beam with two closely spaced frequencies produced by the Zeeman effect; the width of that beam in a plane transverse to the body axis is at least equal to the diameter of that body. Another monochromatic beam at the second laser frequency bypasses the transparent body and is recombined with the first beam downstream of the transluminated body to form a field of radiation which is photoelectrically sampled at closely spaced locations in the aforementioned transverse plane to provide a multiplicity of electrtical signals in the MHz range differing in phase from a reference wave of the same frequency photoelectrically obtained from the same monochromatic beams. The phase differences, determined by a comparator, are fed to a calculator computing the refractive-index profile therefrom.
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公开(公告)号：IT8267149D0
公开(公告)日：1982-02-10
申请号：IT6714982
申请日：1982-02-10
Applicant: CSELT CENTRO STUDI LAB TELECOM
Inventor： COPPA GIANNI , GREGO GIORGIO
Abstract: The invention is based on phase difference measurements. A Zeeman effect laser (3) generates a light beam (4) containing two radiations with slightly different frequencies whose beat is generated at the end of a path external to the material (1, 2a, 101). The same beam is split into the two component radiations (4c, 4d); the beats are generated between the first radiation, which is made to follow a path outside the material, and two radiations obtained by making the second radiation follow two different paths inside the material. The phase differences of these two beats with respect to the first are measured by a phase-comparison system (20, 21), and the refractive-index values as well as the thickness values are obtained by suitable computing means.
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公开(公告)号：IT1320072B1
公开(公告)日：2003-11-12
申请号：ITTO20000417
申请日：2000-05-04
Applicant: CSELT CENTRO STUDI LAB TELECOM
Inventor： GREGO GIORGIO
Abstract: First (1) and a second (2) sources of radiation located in two points of a given space are used. The sources (1, 2) create angular scanning of the space with first and second radiations respectively. The first and the second radiation have a respective characteristic which varies on the basis of the position reached in the scanning movement. Therefore in correspondence with every point in the space (S) the first and the second radiation have a respective pair of values for said characteristic which univocally identifies the position of said point in the context of said space (S). The position of the point in the context of said space (S) is therefore identified by said pair of values.
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