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    • 7. 发明授权
    • Fiber optic pressure sensor using pressure sensitive fiber different
from input and output fibers
    • 使用不同于输入和输出光纤的压敏光纤的光纤压力传感器
    • US4918305A
    • 1990-04-17
    • US227041
    • 1988-08-01
    • Marek T. WlodarczykMark K. KrageDeborah J. Vickers
    • Marek T. WlodarczykMark K. KrageDeborah J. Vickers
    • G01L1/24
    • G01L1/245
    • A microbend fiber optic pressure sensor includes a short length of sensing fiber comprising a fiber of a transparent dielectric material surrounded by a layer of aluminum or similar metal for which the real part of the complex permittivity is negative over a range of electromagnetic radiation wavelengths. The layer of aluminum is hermetically sealed to the transparent material. The sensing fiber receives light in the range of wavelengths and is subjected to microbends on the dielectric/aluminum boundary by pressure responsive mechanical apparatus for a much greater microbend light loss and therefore greater sensitivity than is obtained with similar sensors using an all glass core/cladding boundary. The sensing fiber may be an aluminum coated single mode fiber with a very small core and a large cladding layer in which the cladding modes are used and the core modes ignored or it may comprise a single glass fiber coated with aluminum. The sensing fiber is used only in the sensing region, with light coupled to one end from a light source and from the other end to a light detector through lower loss multimode optic fibers.
    • 微弯纤维光学压力传感器包括短长度的感测光纤,其包括由铝或类似金属层围绕的透明电介质材料的光纤,其中复电介质的实部在电磁辐射波长的范围内是负的。 铝层与透明材料气密密封。 感测光纤接收波长范围内的光,并通过压力响应性机械设备在电介质/铝边界上受到微弯曲,以获得更大的微弯损耗,因此比使用全玻璃芯/包层的类似传感器获得的灵敏度更高 边界。 感测纤维可以是具有非常小的芯和大的包覆层的铝涂覆的单模光纤,其中使用包层模式,并且忽略芯模,或者它可以包括涂覆有铝的单个玻璃纤维。 感测光纤仅在感测区域中使用,光从光源耦合到一端,另一端通过较低损耗的多模光纤耦合到光检测器。