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    Photoelastic sensor using a variable intensity light source as a feedback means
    81.
    发明授权
    Photoelastic sensor using a variable intensity light source as a feedback means 失效
    使用可变强度光源作为反馈装置的光弹传感器

    公开(公告)号：US4556791A

    公开(公告)日：1985-12-03

    申请号：US502052

    申请日：1983-06-07

    Applicant: William B. Spillman, Jr.

    Inventor： William B. Spillman, Jr.

    IPC: G01L1/24 ,  G02F1/01

    CPC classification number: G01L1/241 ,  G02F1/0131

    Abstract: Light from an external source is collimated, polarized, passed through a voltage dependent quarterwave plate and onto an elasto-optic sensor which serves to retard the light passing therethrough as a function of the external stress being measured. Light emanating from the sensor is divided into components at .+-.45.degree. to the applied stress axis. These components are coupled through optical fibers to photodetectors and the resulting electrical signals are applied to difference amplifier. The amplifier output is used to control a second light source whose output via an optical fiber is converted to a voltage suitable to drive the voltage dependent quarterwave plate in a negative feedback fashion such that the wave retardations resulting from the applied stress and nulled out. The power necessary to drive the voltage dependent quarterwave plate is used as a measure of the applied stress.

    Abstract translation: 来自外部源的光被准直，极化，通过依赖于电压的四分之一波片和弹性光学传感器，其用于根据所测量的外部应力来延迟穿过其中的光。 从传感器发出的光被分成与施加的应力轴成+/- 45°的分量。 这些组件通过光纤耦合到光电检测器，并且所得到的电信号被施加到差分放大器。 放大器输出用于控制第二光源，其经由光纤的输出被转换成适于以负反馈方式驱动依赖于电压的四分之一波片的电压，使得由所施加的应力引起的波延迟钝。 驱动依赖于电压的四分之一波片所需的功率用作测量施加的应力。

    Method and device for the measurement of photoelasticity
    82.
    发明授权
    Method and device for the measurement of photoelasticity 失效
    用于测量光弹性的方法和装置

    公开(公告)号：US4192610A

    公开(公告)日：1980-03-11

    申请号：US787280

    申请日：1977-04-13

    Applicant: Dimitri Paraskevas

    Inventor： Dimitri Paraskevas

    IPC: G01L1/24 ,  G01B11/18 ,  G01J4/00

    CPC classification number: G01L1/241

    Abstract: At least four beams of linearly polarized light are produced separately at one and the same point of measurement in a single direction of observation at right angles to a unitary sheet of a specimen of photoelastic material in order to determine the state of mechanical stress in the plane of the sheet.

    Abstract translation: 在与光弹性材料试样的整体片材成直角的单个观察方向上的同一测量点处分别产生至少四束直线偏振光，以确定平面中机械应力的状态 的表格。

    Photoelastic load measurement alarm device
    83.
    发明授权
    Photoelastic load measurement alarm device 失效
    光弹负载测量报警装置

    公开(公告)号：US3971934A

    公开(公告)日：1976-07-27

    申请号：US601648

    申请日：1975-08-04

    Applicant: Joseph Coatta ,  Charles Leslie Emery

    Inventor： Joseph Coatta ,  Charles Leslie Emery

    IPC: G01G19/14 ,  G01G23/32 ,  G01L1/24 ,  G02F1/01

    CPC classification number: G01G19/14 ,  G01G23/32 ,  G01L1/241

    Abstract: This invention relates to a photoelastic load measurement device which measures the load on the cable of the crane by measuring the strain in a particular structural member of the crane and is calibrated to operate an alarm, indicator and/or recorder. A source of polarized light directs a beam of light through a photoelastic plate to an analyzer plate and a photocell. The photoelastic plate is subjected to stress from the structural member which varies with the load on the cable of the crane. The stress in the photoelastic plate subjects the beam of polarized light to temporary double refraction (birefringence), and the intensity of the light received by the photocell through the analyzer plate is dependent upon the degree of retardation of the light in the photoelastic plate. The output signal from the photocell is amplified to operate the alarm, indicator and/or recorder. The device includes apparatus which automatically compensates for changes in ambient temperature and variations in boom angle.

    Abstract translation: 本发明涉及一种光弹性载荷测量装置，其通过测量起重机的特定结构构件中的应变来测量起重机的缆索上的载荷，并被校准以操作报警器，指示器和/或记录器。 偏振光源将光束通过光弹性板引导到分析器板和光电池。 光弹性板受到来自结构构件的应力，该应力随起重机电缆的负载而变化。 光弹性板中的应力使偏振光束临时双折射（双折射），并且由光电池通过分析器板接收的光的强度取决于光弹性板中的光的延迟程度。 来自光电管的输出信号被放大以操作报警器，指示器和/或记录器。 该装置包括自动补偿环境温度变化和吊臂角度变化的装置。

    Polariscope for determining stress in a transparent material
    84.
    发明授权
    Polariscope for determining stress in a transparent material 失效
    用于确定透明材料应力的极化

    公开(公告)号：US3811775A

    公开(公告)日：1974-05-21

    申请号：US26482772

    申请日：1972-06-21

    Applicant: ASG IND INC

    Inventor： ABU SAUD M

    IPC: G01L1/24 ,  G01B11/18

    CPC classification number: G01L1/241

    Abstract: A polariscope is described for detecting stresses in a transparent object. The polariscope comprises means for producing a beam of polychromatic plane polarized light, a condensing lens, an aperture, a quarter-wave retardation plate, analyzing means and a photocell. Changes in stress cause changes in the color and intensity of the light detected. Means are provided for scanning the polychromatic light beam back and forth in one direction across the transparent object that is being studied. Means are also provided for moving the transparent object in a direction transverse to the direction of the scanning light beam. The output of the photocell is applied through an amplifier to a chart recorder in order to produce a plot of the stresses in the object with respect to their position.

    Abstract translation: 描述了用于检测透明物体中的应力的偏光镜。 偏振器包括用于产生多色平面偏振光束，聚光透镜，孔径，四分之一波长延迟板，分析装置和光电池的装置。 压力变化会导致检测到的光的颜色和强度发生变化。 提供了用于沿着正在研究的透明物体沿一个方向来回扫描多色光束的装置。 还提供了用于沿垂直于扫描光束的方向的方向移动透明物体的装置。 光电管的输出通过放大器施加到图表记录器，以产生对象相对于它们的位置的应力的图。

    STRAIN DETECTOR
    89.
    发明公开
    STRAIN DETECTOR 审中-公开

    公开(公告)号：US20230175901A1

    公开(公告)日：2023-06-08

    申请号：US17625900

    申请日：2019-07-24

    Applicant: THE CHUGOKU ELECTRIC POWER CO., INC.

    Inventor： Hidetaka NISHIDA

    IPC: G01L1/24

    CPC classification number: G01L1/241 ,  G01L1/242

    Abstract: A strain detector 1 includes: a metal plate 4 that is fixed to a first end 210 of a first tube 21 and a second end 220 of a second tube 22 while the metal plate 4 straddles a weld 3 between the first end 210 and the second end 220, the first tube 21 and the second tube 22 forming part of a boiler tube 2; and an optical fiber 5 that is fixed to a top of the metal plate 4 and that extends in an axial direction (a first direction D1) of the first tube 21 and the second tube 22. In this manner, the metal plate 4 is fixed to the first tube 21 and the second tube 22 while straddling the weld 3, and the optical fiber 5 is fixed to the top of the metal plate 4, which enables the strain detector 1 to accurately detect a strain in the weld 3 of the boiler tube 2.

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