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    62.
    发明专利
    未知

    公开(公告)号：DE69206654T2

    公开(公告)日：1996-07-11

    申请号：DE69206654

    申请日：1992-03-25

    Applicant: HAMAMATSU PHOTONICS KK

    Inventor： TAKAHASHI HIRONORI ,  URAKAMI TSUNEYUKI ,  AOSHIMA SHINICHIRO

    IPC: G01R1/07 ,  G01R15/24 ,  G01R1/067

    Abstract: Polarized light is input to an optical modulator (16) typically consisting of an electrooptic crystal. The polarization state of the input light is changed in accordance with a voltage applied to the optical modulator (16). Receiving the light output from the optical modulator, a polarization interferometer (18) produces an interference fringe on the input surface of a photodetector (20) such as a streak camera or a CCD line sensor (134). Based on an output signal of the photodetector (20), an analyzing device (22) calculates the pitch and a movement distance of the interference fringe to determine the voltage applied to the optical modulator (16).

    63.
    发明专利
    未知

    公开(公告)号：DE69206654D1

    公开(公告)日：1996-01-25

    申请号：DE69206654

    申请日：1992-03-25

    Applicant: HAMAMATSU PHOTONICS KK

    Inventor： TAKAHASHI HIRONORI ,  URAKAMI TSUNEYUKI ,  AOSHIMA SHINICHIRO

    IPC: G01R1/07 ,  G01R15/24 ,  G01R1/067

    Abstract: Polarized light is input to an optical modulator (16) typically consisting of an electrooptic crystal. The polarization state of the input light is changed in accordance with a voltage applied to the optical modulator (16). Receiving the light output from the optical modulator, a polarization interferometer (18) produces an interference fringe on the input surface of a photodetector (20) such as a streak camera or a CCD line sensor (134). Based on an output signal of the photodetector (20), an analyzing device (22) calculates the pitch and a movement distance of the interference fringe to determine the voltage applied to the optical modulator (16).

    65.
    发明专利
    未知

    公开(公告)号：DE69105893T2

    公开(公告)日：1995-07-13

    申请号：DE69105893

    申请日：1991-09-19

    Applicant: HAMAMATSU PHOTONICS KK

    Inventor： HIRANO ISUKE ,  TAKAHASHI HIRONORI ,  URAKAMI TSUNEYUKI ,  TSUCHIYA YUTAKA ,  TAKEMORI TAMIKI ,  AOSHIMA SHINICHIRO

    IPC: G01J4/00 ,  G01J4/04 ,  G01M11/02

    Abstract: Young's interferometer (18) consisting of a single slit (14) and a double slit member (16), and an analyzer (20) are arranged along the axis of light to be measured. Parallel slits of the double slit member are provided with respective polarizers (16A,16B) whose polarizing directions are at +/- 45 DEG to the longitudinal direction of the parallel slits. The polarizing direction of the analyzer (20) is set in parallel with the parallel slits. The incident light passes through Young's interferometer (18) and the analyzer (20) to form an interference fringe, which is detected by an image detector unit (22). An image analyzer unit (24) produces an intensity profile of the interference fringe and determines the polarization state of the incident light, for instance, by comparing the produced intensity profile with profiles stored in advance.

    66.
    发明专利
    未知

    公开(公告)号：DE69019477D1

    公开(公告)日：1995-06-22

    申请号：DE69019477

    申请日：1990-11-28

    Applicant: HAMAMATSU PHOTONICS KK

    Inventor： AOSHIMA SHINICHIRO ,  TAKAHASHI HIRONORI ,  TSUCHIYA YUTAKA

    IPC: G01J1/44 ,  G01R1/07 ,  G01R13/34 ,  G01R15/24 ,  G01R19/00 ,  G01R1/067 ,  G02F1/03

    Abstract: A light beam from a source (14) is chopped by a chopper (16) and split by a beam splitter (24) into two beams. The intensity of a first beam is changed by using, e.g., an electrooptic material (12) in accordance with a change in a signal to be detected, such as a voltage in an electronic device. The intensity of the first beam is detected by a first photodetector (22). The second beam is detected by a second photodetector (26) without its intensity being changed to provide a reference signal. At least one of the outputs of the first (22) and second (26) photodetectors are adjusted so that they are equal when no signal is applied to the light intensity changing means (12). The difference of the thus adjusted output signals is detected a narrow band detecting means (28) such as a lock-in amplifier (42C) in a narrow band at the chopping frequency to provide an output having a greater sensitivity.

    69.
    发明专利
    未知

    公开(公告)号：DE3887006D1

    公开(公告)日：1994-02-24

    申请号：DE3887006

    申请日：1988-06-09

    Applicant: HAMAMATSU PHOTONICS KK

    Inventor： TAKAHASHI HIRONORI ,  AOSHIMA SHINICHIRO ,  NAKAMURA TAKUYA ,  TSUCHIYA YUTAKA

    IPC: G01R1/07 ,  G01R15/24 ,  G01R19/00 ,  G01R19/155 ,  G01R31/302 ,  H01L21/66 ,  G01R1/067 ,  G01R15/07

    Abstract: A voltage detecting device using an electro-optical material with a refractive index which is changed by a voltage at a part of an object comprising a light source, comprises an electro-optical material for changing the optical path of the light beam from the light source in accordance with the refraction index of the electro-optical material and a slit or optical fiber extractor at a predetermined position at the output of the electro-optical material for extracting the quantity of light of the light beam at the predetermined position and a detector detecting a voltage at the part of the object from the quantity of light extracted.

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