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    • 4. 发明授权
    • Measuring displacement between two relatively movable structures
    • 测量两个相对移动结构之间的位移
    • US4694690A
    • 1987-09-22
    • US891652
    • 1986-07-30
    • Robert JonesKeith W. JonesWilliam R. S. Baxter
    • Robert JonesKeith W. JonesWilliam R. S. Baxter
    • G01B11/16G01M19/00
    • G01B11/16
    • An apparatus for use in measuring relative movement between two structures is described. A support (7) having bores for receiving input and output optical fibres (2, 10) is mounted on a plate (24), secured to one of the structures, at a predetermined position using alignment means (50). A filter (8) is fixed relative to the other structure so that light passing down the input fibre (2) passes through the filter (8) to the output fibre (10). The filter comprises a split field filter so that when light of two wavelengths is transmitted via the input fibre (2), the intensity of light at each wavelength transmitted through the filter (8) depends on the position of the filter relative to the support. An analogue output proportional to the displacement is provided using the transmitted intensities. The invention is particularly applicable to measuring displacement of a railway rail with respect to an underlying structure, and a method and installation for this are described.
    • 描述了一种用于测量两个结构之间相对运动的装置。 具有用于接收输入和输出光纤(2,10)的孔的支撑件(7)安装在使用对准装置(50)在预定位置固定到结构之一的板(24)上。 过滤器(8)相对于另一结构固定,使得通过输入光纤(2)的光通过过滤器(8)到输出光纤(10)。 滤波器包括分离场滤波器,使得当经由输入光纤(2)传输两个波长的光时,透过滤光器(8)的每个波长的光强度取决于滤光器相对于支撑件的位置。 使用传输的强度提供与位移成比例的模拟输出。 本发明特别适用于测量铁路轨道相对于下面的结构的位移,并且描述了这种方法和装置。