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1192 records (took 0.021 seconds)

    474.
    发明专利
    未知

    公开(公告)号：DE68921896D1

    公开(公告)日：1995-04-27

    申请号：DE68921896

    申请日：1989-12-26

    Applicant: UOP INC

    Inventor： LEFEBRE DAVID

    IPC: G01J1/18 ,  G01J3/06 ,  G01J3/08 ,  G01J3/42

    Abstract: Spectrophotometric apparatus and methodology suitable for continuous and long-term use. The apparatus includes a monochromator providing pre-dispersed monochromatic light to the optical inputs of a pair of fiber optic cables and a translator for alternatively positioning the fiber optic cables at the same location with respect to the monochromator output. One of the cables conducts light to a sample under study while the other cable provides a reference for light intensity measurements. The methodology includes the steps of performing two scans through the monochromator output for each measurement on the sample. The fiber optic cables are moved between scans so that the cable employed in the latter scan occupies the former position of the cable employed in prior scan.

    SPECTROPHOTOMETER HAVING MEANS FOR SIMULTANEOUS MODULATION, SWITCHING AND WAVELENGTH SELECTION OF A LIGHT SOURCE
    477.
    发明专利
    SPECTROPHOTOMETER HAVING MEANS FOR SIMULTANEOUS MODULATION, SWITCHING AND WAVELENGTH SELECTION OF A LIGHT SOURCE 未知

    公开(公告)号：CA2052467A1

    公开(公告)日：1992-04-02

    申请号：CA2052467

    申请日：1991-09-30

    Applicant: LOWNE ALAN J ,  SANDIFER JAMES R ,  UERZ DAVID S ,  SWITALSKI STEVEN C ,  LIU HUSE YAN

    Inventor： LOWNE ALAN J ,  SANDIFER JAMES R ,  UERZ DAVID S ,  SWITALSKI STEVEN C ,  LIU HUSE-YAN

    IPC: G01J3/42 ,  G01J1/44 ,  G01J3/08 ,  G01J3/28 ,  G01J3/51 ,  G01N21/31 ,  G01N21/35 ,  G02B26/04

    Abstract: In known spectrophometers, a single light source is used to illuminate both a sample and a reference. A single detector is used to detect the light at both the sample and the reference. A chopper wheel having aperture portions is used to allow the light to pass through a selected filter in the apertures. However, in such devices, the beams from the sample and the reference arrive at the detector at the same time and movable shutters need to be employed. Described herein is a spectrophotometer (10) comprising a single light source (12), a single detector (14), optics (30, 36, 340, 42, 44, 46, 48, 50, 52, 54, 56, 58, 90, 92, 100) for dually and alternatively reading a sample (94) and a reference (96), and which employs only one moving part. That moving part is a chopper (42) containing multiple pass-through apertures (60a, 60b, 60c, 60d, 60e, 60f), each filled with a unique bandpass filter to select wavelengths to specifically illuminate the sample (94) or reference (96). To inform the spectrophotometer (10) whether and when it is reading the sample (94) or the reference (96), energy relay means (70a, 70b, 70c, 70d, 70e, 70f, 70g, 70h, 70i, 70j, 70k, 70l) are provided between an energy emitter (80) and an energy detector (82) in an amount of at least twice the number of the pass-through apertures (60a, 60b, 60c, 60d, 60e, 60f).

    479.
    发明专利
    未知

    公开(公告)号：DE3926090A1

    公开(公告)日：1991-02-14

    申请号：DE3926090

    申请日：1989-08-07

    Applicant: BODENSEEWERK PERKIN ELMER CO

    Inventor： WULF JUERGEN DIPL PHYS DR ,  LAHMANN WERNER DIPL PHYS

    IPC: G01J3/42 ,  G01J3/08 ,  G01J3/10 ,  G01N21/31 ,  G02B26/04

    Abstract: In a double-beam photometer comprising a light source providing a light beam, detector means, a sample area, optical means for guiding the light beam as a measuring light beam through the sample area onto the detector means, means for guiding the same light beam as a reference light beam onto the detector means while avoiding the sample area, and chopper means disposed in a splitting location for splitting the light beam into the measuring light beam, which are combined into one path of rays in a recombination location, after the measuring light beam has passed through the sample area, with the splitting location and the recombination location being spatially close to each other. The chopper means has a single chopper which simultaneously effects the splitting and the combination of the measuring and reference light beams.

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