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    21.
    发明专利
    未知

    公开(公告)号：IT8468224D0

    公开(公告)日：1984-12-10

    申请号：IT6822484

    申请日：1984-12-10

    Applicant: CSELT CENTRO STUDI LAB TELECOM

    Inventor： COPPA GIANNI ,  VITA PIETRO DI

    IPC: G01J1/00 ,  G01J1/02 ,  G01J1/42 ,  G01J4/00 ,  G01M11/00 ,  G01B

    Abstract: A method and an apparatus are provided wherein a light beam is passed through a slit (7) oscillating with respect to the beam, and a periodic signal is obtained from the beam portion traversing the slit and is split into its spectral components. Moment values are derived from the values of the amplitudes of such components.

    24.
    发明专利
    未知

    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

    IPC: G01B11/06 ,  G01J9/04 ,  G01N21/35 ,  G01N21/45 ,  G01J

    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.

    26.
    发明专利
    未知

    公开(公告)号：IT1199897B

    公开(公告)日：1989-01-05

    申请号：IT6766585

    申请日：1985-07-22

    Applicant: CSELT CENTRO STUDI LAB TELECOM ,  LAB TELECOMUNICAZIONI S P A

    Inventor： CALZAVARA MASSIMO ,  COPPA GIANNI ,  DI VITA PIETRO

    IPC: G02B6/24 ,  G01M11/00 ,  G02B

    Abstract: An optical beam is injected into a single-mode (FO) fibre of a given length and outgoes from an end face of the fibre, is reflected by a reflecting optical system into said fibre; the optical power of the reflected beam guided backward by the fibre is measured. Said end face of the fibre is placed in the optical centre of the reflecting system to obtain the maximum reflected power, and is then deviated from said position detecting the occurring reductions of the reflected optical power.A device and variants to implement the method are also described.

    METHOD OF AND APPARATUS FOR THE MEASUREMENT OF THE REFRACTIVE-INDEX PROFILE IN MONOMODE OPTICAL FIBRES
    27.
    发明专利
    METHOD OF AND APPARATUS FOR THE MEASUREMENT OF THE REFRACTIVE-INDEX PROFILE IN MONOMODE OPTICAL FIBRES 未知

    公开(公告)号：CA1235923A

    公开(公告)日：1988-05-03

    申请号：CA497701

    申请日：1985-12-16

    Applicant: CSELT CENTRO STUDI LAB TELECOM

    Inventor： COPPA GIANNI ,  DI VITA PIETRO

    IPC: G01M11/02 ,  G01M11/00 ,  G01N21/41 ,  G02B6/00 ,  G01N21/84

    Abstract: The present invention provides a method which is of the guided near field type so as to exploit fibre propagation characteristics, and requires no complex processing of a measured value. In this method, an image of the fibre output end is radially scanned, and for each value of a distance r from the image axis, two image-intensity measurements are effected, the first after optically filtering the beam emerging from the fibre so as to modulate the beam according to a factor p4 (with p = a ? sin .THETA., .THETA. being the angular beam coordinate, and a the distance of the generic filter point from the fibre output end), the second meansurement being effected by directly collecting the beam leaving the fibre end, the refractive index value at that point being derived from the ratio between the first and the second measurement.

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