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    OPTICAL SPECTROSCOPY SYSTEM
    2.
    发明专利
    OPTICAL SPECTROSCOPY SYSTEM 未知

    公开(公告)号：CA2041342C

    公开(公告)日：1997-06-24

    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.

    5.
    发明专利
    未知

    公开(公告)号：DE69016804D1

    公开(公告)日：1995-03-23

    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.

    6.
    发明专利
    未知

    公开(公告)号：IT1247764B

    公开(公告)日：1994-12-30

    申请号：IT6781490

    申请日：1990-10-22

    Applicant: CSELT CENTRO STUDI LAB TELECOM

    Inventor： COCITO GIUSEPPE ,  GREGO GIORGIO

    IPC: G01J9/04 ,  G01N21/41 ,  G01N

    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.

    7.
    发明专利
    未知

    公开(公告)号：DE3788045T2

    公开(公告)日：1994-04-07

    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.

    8.
    发明专利
    未知

    公开(公告)号：DE69000564D1

    公开(公告)日：1993-01-21

    申请号：DE69000564

    申请日：1990-06-26

    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.

    DISTRIBUTED TEMPERATURE SENSOR USING AN OPTICAL FIBRE AS SENSING ELEMENT
    9.
    发明专利
    DISTRIBUTED TEMPERATURE SENSOR USING AN OPTICAL FIBRE AS SENSING ELEMENT 未知

    公开(公告)号：CA1308935C

    公开(公告)日：1992-10-20

    申请号：CA551272

    申请日：1987-11-06

    Applicant: CSELT CENTRO STUDI LAB TELECOM

    Inventor： GREGO GIORGIO

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

    Abstract: The distributed temperature sensor employs an optical fibre as sensing element located in an ambient region or near a body of which the temperature is to be monitored or measured. A source of light pulses sends pulses into the fibre 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 and the spectrum variation analyzing means 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.

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