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    HIGHLY SENSITIVE OPTICAL FIBER CAVITY COATING REMOVAL DETECTION
    2.
    发明申请
    HIGHLY SENSITIVE OPTICAL FIBER CAVITY COATING REMOVAL DETECTION 审中-公开
    高灵敏度光纤孔径涂层去除检测

    公开(公告)号：WO9617225A2

    公开(公告)日：1996-06-06

    申请号：PCT/US9515370

    申请日：1995-11-22

    Applicant: UNITED TECHNOLOGIES CORP

    Inventor： DUNPHY JAMES R ,  RYAN JAMES J

    IPC: C23C14/14 ,  C23C14/24 ,  G01D5/353 ,  G01M11/00 ,  G01M11/08 ,  G01N17/00 ,  G01N21/45 ,  G02F1/21

    CPC classification number: G01M11/083 ,  G01D5/35383 ,  G01N17/00 ,  G01N21/45

    Abstract: A highly sensitive optical fiber cavity coating removal detector employs an optical fiber (18) having a pair of Bragg gratings (20, 30) embedded therein and separated by a section of fiber making up an optical cavity (26). The optical path length of the cavity (26) is sized with the central reflection wavelength of the fiber gratings (20, 30) so as to create an optical resonator. The cavity (26) is coated with a material (40) which corrodes or is otherwise removable, such as aluminum. The coating (40) exerts forces (46) radially inward on the cavity (26) so as to cause the refractive index of the cavity and thus its optical path length to change, thereby causing the resonator to come out of resonance. The forces (46) on the cavity (26) are reduced when the coating (40) corrodes, thereby causing the resonator to re-enter resonance. Additionally, the coating causes optical losses to exist due to non-uniform variations in refractive index caused by non-uniform forces from coating irregularities.

    Abstract translation: 高灵敏度的光纤腔涂层去除检测器采用光纤（18），其具有嵌入其中的一对布拉格光栅（20,30），并由构成光腔（26）的纤维的一部分分隔开。 通过光纤光栅（20,30）的中心反射波长来确定空腔（26）的光路长度，以便产生光学谐振器。 空腔（26）涂覆有腐蚀或可移除的材料（40），例如铝。 涂层（40）在空腔（26）上径向向内施加力（46），以引起空腔的折射率并因此改变其光路长度，从而使谐振器脱离共振。 当涂层（40）腐蚀时，空腔（26）上的力（46）减小，从而使谐振器重新进入共振。 此外，由于涂层不均匀的不均匀的力引起的折射率的不均匀的变化，涂层会导致光学损失。

    FORWARD SCATTERING LASER PARTICULATE SENSOR.
    3.
    发明公开
    FORWARD SCATTERING LASER PARTICULATE SENSOR. 失效
    粒子在激光前向散射。

    公开(公告)号：EP0108799A4

    公开(公告)日：1984-09-14

    申请号：EP83902028

    申请日：1983-05-10

    Applicant: UNITED TECHNOLOGIES CORP

    Inventor： MELTZ GERALD ,  NEWMAN LEON A ,  DUNPHY JAMES R ,  FOSTER MARTIN C

    IPC: G01N21/49 ,  G01N21/53

    CPC classification number: G01N21/85 ,  G01N21/53 ,  G01N2021/151

    Abstract: A sensor employs a laser (12) to obtain a collimated light beam for transmission across the gas effluent of a catalytic cracking process. Particulate matter entrained in the gas flow forward scatters light energy to a collecting aperture (18) which, in turn focuses the scattered light on a first photodetector (22). A second photodetector (30) receives directly transmitted light energy. A ratio (64) between the output signals of the two photodetectors is derived and presented to a threshold level detector (70). If the magnitude of the scatter exceeds a predetermined level it is concluded that a catalyst load dump has occurred. The optical system is carefully selected to ensure that only light energy scattered from a sample volume (16) within the entrained gas flow reaches the first photodetector (22). This is important because it prevents particulate matter on the surfaces of the transparent windows (36 and 50) from affecting the operation of the sensor.

    FORWARD SCATTERING LASER PARTICULATE SENSOR
    8.
    发明专利
    FORWARD SCATTERING LASER PARTICULATE SENSOR 未知

    公开(公告)号：CA1240758A

    公开(公告)日：1988-08-16

    申请号：CA430556

    申请日：1983-06-16

    Applicant: UNITED TECHNOLOGIES CORP

    Inventor： MELTZ GERALD ,  NEWMAN LEON A ,  DUNPHY JAMES R ,  FOSTER MARTIN C

    IPC: G01N21/85

    Abstract: Forward Scattering Laser Particulate Sensor A sensor employs a laser to obtain a collimated light beam for transmission across the gas effluent of a catalytic cracking process. Particulate matter entrained in the gas flow forward scatters light energy to a collecting aperture which, in turn focuses the scattered light on a first photodetector. A second photodetector receives directly transmitted light energy. A ratio between the output signals of the two photodetectors is derived and presented to a threshold level detector. If the magnitude of the scatter exceeds a predetermined level it is concluded that a catalyst load dump has occurred. The optical system is carefully selected to ensure that only light energy scattered from a sample volume within the entrained gas flow reaches the first photodetector. This is important because it prevents particulate matter on the surfaces of the transparent windows from affecting the operating of the sensor.

    Forward scattering laser particulate sensor
    9.
    发明专利
    Forward scattering laser particulate sensor 未知

    公开(公告)号：IT1163786B

    公开(公告)日：1987-04-08

    申请号：IT2207783

    申请日：1983-07-14

    Applicant: UNITED TECHNOLOGIES CORP

    Inventor： MELTZ GERALD ,  DUNPHY JAMES R ,  NEWMAN LEON A ,  FOSTER MARTIN C

    IPC: H01S20060101 ,  H01S

    Abstract: The sensor employs a laser to obtain a collimated light beam for transmission across the gas effluent of a catalytic cracking process. Particulate matter entrained in the gas flow forward scatters light energy to a collecting aperture which, in turn focuses the light scattered on a first photodetector. A second photodetector receives directly transmitted light energy. A ratio between the output signals of the two photodetectors is derived and presented to a threshold level detector. If the magnitude of the scatter exceeds a predetermined level it is concluded that a catalyst load dump has occured. The optical system is selected to ensure that only light energy scattered from a sample volume within the entrained gas flow reaches the first photodetector. This prevents particular matter on the surfaces of the transparent windows from affecting the operating of the sensor.

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