公开(公告)号：IT1278383B1

公开(公告)日：1997-11-20

申请号：ITTO950129

申请日：1995-02-23

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： COCITO GIUSEPPE ,  GREGO GIORGIO

IPC: G02B6/00 ,  C03B37/027 ,  C03B37/12 ,  C03B37/15 ,  G02B6/024

Abstract: To manufacture polarisation-maintaining optical fibres, a fibre (8) is directly and continuously irradiated with at least one beam (9) of UV radiation during drawing and before application of external coatings.

公开(公告)号：CA2170123A1

公开(公告)日：1996-08-24

申请号：CA2170123

申请日：1996-02-22

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： COCITO GIUSEPPE ,  GREGO GIORGIO

IPC: G02B6/00 ,  C03B37/027 ,  C03B37/12 ,  C03B37/15 ,  G02B6/024 ,  C03B37/10 ,  G02B6/17

Abstract: To manufacture polarisation-maintaining optical fibres, a fibre (8) is directly and continuously irradiated with at least one beam (9) of UV radiation during drawing and before application of external coatings.

公开(公告)号：DE69117426T2

公开(公告)日：1996-08-22

申请号：DE69117426

申请日：1991-10-21

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： COCITO GIUSEPPE ,  GREGO GIORGIO

IPC: G01J9/04 ,  G01N21/41

Abstract: The system uses a monochromatic radiation source (1) and an acousto-optic modulator (2), which is driven by a periodically variable frequency. 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. After the second beam has been collimated, radiations of both beams are sent towards the component under test and an electrical signal with varying frequency is generated representative of the beat between such radiations at the output from the component. A spectral analysis of the beat signal is carried out, and the refractive index value is derived from the position taken by the various frequencies of the beat signal on a detection plane.

公开(公告)号：DE69201917T2

公开(公告)日：1995-09-07

申请号：DE69201917

申请日：1992-06-26

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： GREGO GIORGIO ,  TALLONE LUIGI

IPC: G01J3/12 ,  G01J3/26 ,  G01J3/28

Abstract: The radiation to be analysed is sent onto an interference filter (6) which selects different portions of the radiation spectrum in correspondence with different incidence angles. The intensity values of the radiation outgoing from the element (6) are stored by a measuring and data processing unit (9) which processes such values with the transfer function of the element to obtain the information on the spectrum.

公开(公告)号：DE69016804T2

公开(公告)日：1995-07-20

申请号：DE69016804

申请日：1990-03-22

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： GREGO GIORGIO

IPC: G02F1/35 ,  G02F1/01 ,  G02F1/355 ,  G02F3/00 ,  G06E3/00 ,  G06T7/00 ,  G02F1/21

Abstract: A device for the correlation between optical beams having spatially modulated intensities, which comprises an active-glass window (F), which on one side is illuminated at the same time by a reading (L) and a pumping beam (P) through one or a plurality of semi-transparent mirrors (V), the reading beam comprising radiations with a wavelength equal to that of the transition between the intermediate and fundamental energy level and the pump beam comprising radiations with a wavelength corresponding to the energy of the highest power level of the material forming the active glass, obtaining on the other side of the window a light beam carrying the correlation between the two beams above.

公开(公告)号：DE3788045D1

公开(公告)日：1993-12-09

申请号：DE3788045

申请日：1987-12-09

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： GREGO GIORGIO

IPC: G01J3/44 ,  G01N11/00 ,  G01N21/49 ,  G01N21/47

Abstract: The method of measuring viscosity of a body exploits the scattering effects the body introduces into a substantially monochrmatic radiation passing through it; more paticularly, the width of the spectral line due to Brillouin scattering is measured. The temperature of the body can be determined too, by measuring also the width of the line generated by Rayleigh scattering. The method is of particular interest for measurements on glasses.

公开(公告)号：CA2019950C

公开(公告)日：1993-04-06

申请号：CA2019950

申请日：1990-06-27

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： GREGO GIORGIO

IPC: G01D5/26 ,  G08C21/00

Abstract: An optical system for measuring linear or angular displacements uses a monochromatic radiation source and an acousto-optic modulator, which acts as a Bragg modulator and is driven at a frequency which is caused periodically to 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. The second beam is collimated. For measuring angular displacements, the collimated beam is recombined with the first beam after traversing a plate with a plane parallel faces, to which plate the rotation of a moving detent is transmitted, and a photodetector generates a beat signal whose frequency depends on the angular position of the plate. For measuring linear displacements, the two beams are directly sent to a detector moving with the moving element.

公开(公告)号：CA1304955C

公开(公告)日：1992-07-14

申请号：CA553005

申请日：1987-11-27

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： GREGO GIORGIO

IPC: G01J3/44 ,  G01N11/00 ,  G01N21/49 ,  G01N21/47

Abstract: The method of measuring viscosity of a body exploits the scattering effects the body introduces into a substantially monochromatic radiation passing through it: more particularly, the width of the spectral line due to Brillouin scattering is measured. The temperature of the body can be determined too, by measuring also the width of the line generated by Rayleigh scattering. The method is of particular interest for measurements on glasses.

公开(公告)号：ITTO920195D0

公开(公告)日：1992-03-09

申请号：ITTO920195

申请日：1992-03-09

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： GREGO GIORGIO

IPC: G01J20060101

公开(公告)号：CA2041342A1

公开(公告)日：1991-10-28

申请号：CA2041342

申请日：1991-04-26

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： GREGO GIORGIO

IPC: G01J3/12 ,  G01J3/00 ,  G01J3/02 ,  G01J3/28 ,  G01J3/44 ,  G01J11/00 ,  G01N21/27 ,  G01N21/65

Abstract: An optical spectroscopy system is provided, in which a pulse of a radiation to be analyzed is passed through a diffractive element presenting high temporal chromatic dispersion so as to provide temporal dispersion of different wavelengths comprised by the radiation, and the temporal dispersion is measured either directly or by converting the temporal dispersion into a spatial dispersion, so as to provide data by correlation of the measured dispersion and the characteristics of the diffractive element, which is preferably an elongated optical fibre trunk.