FLICKER PHOTOMETER
    2.
    发明专利

    公开(公告)号:CA2284120C

    公开(公告)日:2006-11-14

    申请号:CA2284120

    申请日:1998-03-04

    Abstract: A flicker photometer has beam generating means (1, 8 and 4) for generating two beams of light of different colours. Light from the beams is viewed at the viewing means, and the intensity of light of one beam relative to that of the other beam can be adjusted by adjustment means comprising an attenuating filter (20) which is movably mounted in the path of one beam. Movement of the filter relative to the beam alters the degree to which the beam is attenuated, and is achieved using an electric motor (22). The motor provides a relatively easy means of adjusting the filter position, and can be used to provide coarse and fine adjustments in response to suitable signals from an optical encoder. The motor also enables the filter, along with the beam generating means, to be mounted on a movable table for use in enabling the photometer to accommodate both short and long-sighted subjects.

    Flicker photometer.
    3.
    发明专利

    公开(公告)号:ZA982011B

    公开(公告)日:1999-09-10

    申请号:ZA982011

    申请日:1998-03-10

    Abstract: A flicker photometer comprises generating means (1, 8, 4) for generating two beams of light of different colours. Both beams are directed to a viewing means (190), and a subject can vary the intensity of light from one beam relative to the other. The colour of the light seen by the subject is caused to alternate. The performance of the photometer is improved by screens which scatter light before it reaches the subject. A first of the screens (186, 188) reflects light from one beam, whilst a second screen (b) is translucent, and thus transmits light from the other. If light of wavelengths to which the eye is less sensitive is passed through the second screen, whilst light of a wavelength to which the eye is more sensitive passes through the first screen, the screens help to make it practicable for the generating means to use a single lamp (1) to produce the light for both beams.

    FLICKER PHOTOMETER
    4.
    发明专利

    公开(公告)号:CA2284120A1

    公开(公告)日:1998-09-17

    申请号:CA2284120

    申请日:1998-03-04

    Abstract: A flicker photometer has beam generating means (1, 8 and 4) for generating two beams of light of different colours. Light from the beams is viewed at the viewing means, and the intensity of light of one beam relative to that of the other beam can be adjusted by adjustment means comprising an attenuating filter (20) which is movably mounted in the path of one beam. Movement of the filter relative to the beam alters the degree to which the beam is attenuated, and is achieved using an electric motor (22). The motor provides a relatively easy means of adjusting the filter position, and can be used to provide coarse and fine adjustments in response to suitable signals from an optical encoder. The motor also enables the filter, along with the beam generating means, to be mounted on a movable table for use in enabling the photometer to accommodate both short and long-sighted subjects.

    Flicker photometer
    5.
    发明专利

    公开(公告)号:GB2323162B

    公开(公告)日:2001-08-15

    申请号:GB9804445

    申请日:1998-03-04

    Abstract: A flicker photometer has beam generating means (1, 8 and 4) for generating two beams of light of different colors. Light from the beams is viewed at the viewing means, and the intensity of light of one beam relative to that of the other beam can be adjusted by adjustment means comprising an attenuating filter (20) which is movably mounted in the path of one beam. Movement of the filter relative to the beam alters the degree to which the beam is attenuated, and is achieved using an electric motor (22). The motor provides a relatively easy means of adjusting the filter position, and can be used to provide coarse and fine adjustments in response to suitable signals from an optical encoder. The motor also enables the filter, along with the beam generating means, to be mounted on a movable table for use in enabling the photometer to accommodate both short and long-sighted subjects.

    Flicker photometer
    10.
    发明专利

    公开(公告)号:AU6507598A

    公开(公告)日:1998-09-29

    申请号:AU6507598

    申请日:1998-03-04

    Abstract: A flicker photometer has beam generating means (1, 8 and 4) for generating two beams of light of different colors. Light from the beams is viewed at the viewing means, and the intensity of light of one beam relative to that of the other beam can be adjusted by adjustment means comprising an attenuating filter (20) which is movably mounted in the path of one beam. Movement of the filter relative to the beam alters the degree to which the beam is attenuated, and is achieved using an electric motor (22). The motor provides a relatively easy means of adjusting the filter position, and can be used to provide coarse and fine adjustments in response to suitable signals from an optical encoder. The motor also enables the filter, along with the beam generating means, to be mounted on a movable table for use in enabling the photometer to accommodate both short and long-sighted subjects.

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