公开(公告)号：DE69307226T2

公开(公告)日：1997-05-22

申请号：DE69307226

申请日：1993-09-03

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： GREGO GIORGIO

IPC: G01C19/72

公开(公告)号：DE681175T1

公开(公告)日：1996-09-12

申请号：DE95106740

申请日：1995-05-04

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： CHIARO LUISELLA ,  GREGO GIORGIO ,  REGIO PAOLA

IPC: G01N11/00 ,  G01M11/00 ,  G01M11/08 ,  G01N3/00 ,  G01N3/08 ,  G01N19/00 ,  G02B6/00

公开(公告)号：CA2070330C

公开(公告)日：1996-02-13

申请号：CA2070330

申请日：1992-06-03

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： GREGO GIORGIO ,  TALLONE LUIGI

IPC: G01J3/12 ,  G01J3/26 ,  G01J3/36 ,  G01J9/02

Abstract: A spectroscopy system based on the use of interference filters is provided, which allows high resolution and high sensitivity to be achieved without specific filter band requirements and without movement of the filter in order to scan wavelengths of interest. The radiation to be analyzed is applied to an interference filter which selects different portions of the radiation spectrum in correspondence with different incidence angles. The intensity values of radiation leaving the filter are stored by a measuring and data processing unit which processes such values using the transfer function of the filter to obtain data as to the spectrum.

公开(公告)号：DE69201917D1

公开(公告)日：1995-05-11

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：DE69104114T2

公开(公告)日：1995-03-09

申请号：DE69104114

申请日：1991-04-25

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

公开(公告)号：ITTO950129D0

公开(公告)日：1995-02-23

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：DE69000564T2

公开(公告)日：1993-04-29

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.

公开(公告)号：CA2070330A1

公开(公告)日：1992-12-29

申请号：CA2070330

申请日：1992-06-03

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： GREGO GIORGIO ,  TALLONE LUIGI

IPC: G01J3/12 ,  G01J3/26

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：DE3781122D1

公开(公告)日：1992-09-17

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.

公开(公告)号：IT9067814D0

公开(公告)日：1990-10-22

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 ,  G01N21/45

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.