Photoelastic load measurement alarm device
    3.
    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

    CPC分类号: G01G19/14 G01G23/32 G01L1/241

    摘要: 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.

    摘要翻译: 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。