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    21.
    发明专利
    未知

    公开(公告)号：IT1311285B1

    公开(公告)日：2002-03-12

    申请号：ITTO991158

    申请日：1999-12-28

    Applicant: CSELT CENTRO STUDI LAB TELECOM

    Inventor： GREGO GIORGIO ,  LUPANO MICHELE

    IPC: H04W12/08 ,  H04W64/00

    Abstract: A controlled area (A) is configured as a telecommunications cellular system location area, connection of cellular system mobile terminals (T) to such location area (A) is checked. A detected connection indicates that the bearer of the terminal (T) accessed the controlled area, which information can thus be used both to prevent unauthorized access and to certify and document authorized access also by interrogation through the system. The fact that terminal (T) has been kept switched on inside the controlled area despite this being interdicted can also be detected and such behavior can be debited to the terminal (T) involved and/or the terminal can be inhibited by means of temporary deactivation of the terminal (T).

    DEVICE FOR THE CORRELATION OF OPTICAL BEAMS
    27.
    发明专利
    DEVICE FOR THE CORRELATION OF OPTICAL BEAMS 未知

    公开(公告)号：CA2012965C

    公开(公告)日：1993-05-25

    申请号：CA2012965

    申请日：1990-03-23

    Applicant: CSELT CENTRO STUDI LAB TELECOM

    Inventor： GREGO GIORGIO

    IPC: G02F1/35 ,  G02F1/01 ,  G02F1/355 ,  G02F3/00 ,  G06E3/00 ,  G06T7/00 ,  G02F1/00 ,  H01S3/102

    Abstract: Correlation is obtained between optical beams having spatially modulated intensities by means of an active-glass window, one side of which is illuminated simultaneously by reading and pumping beams using at least one semi-transparent mirror to combine the beams. The reading beam is of radiation with a wavelength equal to that of the transition between intermediate and fundamental energy levels of the material of the window, and the pump beam is of radiation with a wavelength corresponding to the highest energy level of the material forming the active glass. The light beam leaving the window is modulated with a correlation between the reading and pumping beams.

    28.
    发明专利
    未知

    公开(公告)号：DE3781122T2

    公开(公告)日：1992-12-17

    申请号：DE3781122

    申请日：1987-11-23

    Applicant: CSELT CENTRO STUDI LAB TELECOM

    Inventor： GREGO GIORGIO

    IPC: G01K11/00 ,  G01J5/08 ,  G01J5/10 ,  G01K11/12 ,  G01K11/32 ,  G01K11/18 ,  G01M11/00

    Abstract: The distributed temperature sensor employs an optical fibre (1) as sensing element located in an ambient or near a body of which the temperature is to be monitored or measured. A source (3) of light pulses sends into the fibre pulses of predetermined duration. The backscattered radiation is collected for each pulse and the frequency spectrum variations in the backscattered radiation with respect to the incident radiation are analyzed. A computing means obtains the temperature from said variations. The source (3) and the spectrum variation analyzing means (9) are part of an optical time domain reflectometer which allows the temperature information to be associated with the information on the position of the backscattering point along the fibre.

    METHOD OF AND APPARATUS FOR MEASURING THE THICKNESS AND THEREFRACTIVE INDEX OF TRANSPARENT MATERIALS
    29.
    发明专利
    METHOD OF AND APPARATUS FOR MEASURING THE THICKNESS AND THEREFRACTIVE INDEX OF TRANSPARENT MATERIALS 未知

    公开(公告)号：CA1195858A

    公开(公告)日：1985-10-29

    申请号：CA419994

    申请日：1983-01-21

    Applicant: CSELT CENTRO STUDI LAB TELECOM

    Inventor： COPPA GIANNI ,  GREGO GIORGIO

    IPC: G01B11/06 ,  G01J9/04 ,  G01N21/35 ,  G01N21/45 ,  G01N21/41

    Abstract: A method of measuring the thickness and refractive index of a transparent material is based on phase difference measurements. A Zeeman effect laser generates a light beam containing two radiation components with slightly different frequencies which produce a first beat with one another at the end of an optical path external to the material. The beam is also split into its two radiation components and two further beats are generated between a first radiation component, which is made to follow a path outside the material, and second radiation components obtained by making the second component follow two different paths within the material. The phase differences between these further beats with respect to the first beat are measured by a phase-comparison system, and refractive index values as well as the thickness values can be computed.

    METHOD OF AND APPARATUS FOR DETERMINING THE REFRACTIVE INDEX PROFILE OF OPTICAL FIBRES AND OPTICAL FIBRE PREFORMS
    30.
    发明专利
    METHOD OF AND APPARATUS FOR DETERMINING THE REFRACTIVE INDEX PROFILE OF OPTICAL FIBRES AND OPTICAL FIBRE PREFORMS 未知

    公开(公告)号：CA1183365A

    公开(公告)日：1985-03-05

    申请号：CA419975

    申请日：1983-01-21

    Applicant: CSELT CENTRO STUDI LAB TELECOM

    Inventor： GREGO GIORGIO

    IPC: C03B37/012 ,  G01J9/04 ,  G01M11/02 ,  G01N21/35 ,  G01N21/45 ,  G02B6/00 ,  G01N21/41

    Abstract: The invention allows the refractive index profile of an optical fibre or optical fibre preform to be obtained by phase difference measurements. A Zeeman effect laser generates a light beam of plane waves comprising two radiations with slightly different frequencies. The beam is split into its component radiations and the beats between the first radiation, which is made to follow a path outside the fibre or preform, and the second radiation, which is made to follow a path intersecting the fibre or preform, and is also subjected to phase shifts complementary to those produced by a reference fibre or preform, are generated in a photodetector; the phase differences between said beats and a reference beat are measured, and the refractive index profile compared to that of the reference fibre or preform is obtained from the phase difference values by suitable computing means.

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