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    • 3. 发明授权
    • Fiber optic strain sensor and read-out system
    • 光纤应变传感器和读出系统
    • US5477323A
    • 1995-12-19
    • US194960
    • 1994-02-14
    • Jeffrey P. AndrewsJoseph A. McClintockCarl F. Guerci, Jr.
    • Jeffrey P. AndrewsJoseph A. McClintockCarl F. Guerci, Jr.
    • G01D5/26G01B9/02
    • G01D5/266
    • An optical sensor is described comprising a first optical fiber and a first reflective member. The first optical fiber has a first predetermined length of graded-index multimode optical fiber attached to its end. The first reflective member and the first optical fiber are arranged such that a gap is formed between the unattached end of the graded-index multimode optical fiber and the first reflective member. Also described is a rugged sensor design incorporating the first optical fiber and first reflective sensor as well as a method for providing the predetermined length of graded-index multimode fiber at the end of the first optical fiber. Finally, a readout system for an optical sensor is also described which comprises two optical paths differing in length by an amount equal to an optical path distance in the optical sensor. The readout system also comprises an optical source having a wavelength differing from that of the optical sensor, a modulator and a controller. The readout system provides a linear output signal that is independent of temperature and vibration effects associated with the read-out system.
    • 描述了包括第一光纤和第一反射构件的光学传感器。 第一光纤具有附接到其端部的第一预定长度的渐变折射率多模光纤。 第一反射构件和第一光纤布置成使得在渐变折射率多模光纤的未附着端与第一反射构件之间形成间隙。 还描述了结合第一光纤和第一反射传感器的坚固的传感器设计以及在第一光纤端部处提供预定长度的渐变折射率多模光纤的方法。 最后,还描述了一种用于光学传感器的读出系统,其包括长度不等于光学传感器中的光程距离的量的两个光路。 读出系统还包括具有与光学传感器不同的波长的光源,调制器和控制器。 读出系统提供与读出系统相关的温度和振动效应无关的线性输出信号。
    • 4. 发明授权
    • Fabry-Perot readout technique using wavelength tuning
    • 法布里 - 珀罗读出技术使用波长调谐
    • US5276501A
    • 1994-01-04
    • US972397
    • 1992-11-06
    • Joseph A. McClintockJeffrey P. Andrews
    • Joseph A. McClintockJeffrey P. Andrews
    • G01B9/02G01D5/26G02B6/24G02B6/34
    • G02B6/4215G01B9/02005G01D5/266G01D5/268G02B6/243G02B6/29337G02B6/29395G01B2290/25G02B6/29358
    • A method for sensing an environmental parameter includes the step of sensing the environmental parameter with an interferometer sensor that has a light source emitting a tunable wavelength of light and a gap that changes in length in response to the environmental parameter. The interferometer has a sinusoidal output curve that oscillates in intensity in response to changes in gap length. The wavelength of light emitted by the light source is tuned to a first wavelength to provide a first output value. Similarly, the wavelength of light emitted by the light source is next tuned to a second wavelength to provide a second output value. The first and second output values correspond to points on the sinusoidal output curve that differ by at least half a cycle. The gap length is then calculated from the values of the first wavelength and the difference between the first and second wavelengths. Finally, the value of the environmental parameter is determined from the value of the gap length.
    • 用于感测环境参数的方法包括用干涉仪传感器感测环境参数的步骤,所述干涉仪传感器具有发射可调谐波长的光的光源和响应于环境参数而改变长度的间隙。 干涉仪具有响应于间隙长度变化而强度振荡的正弦输出曲线。 由光源发射的光的波长被调谐到第一波长以提供第一输出值。 类似地,由光源发射的光的波长接下来被调谐到第二波长以提供第二输出值。 第一和第二输出值对应于正弦输出曲线上至少半个周期不同的点。 然后从第一波长的值和第一和第二波长之间的差计算间隙长度。 最后,根据间隙长度的值确定环境参数的值。
    • 5. 发明授权
    • Hybrid fiber optic sensor including a lead out optical fiber having a
remote reflective end
    • 混合光纤传感器包括具有远端反射端的导出光纤
    • US5359405A
    • 1994-10-25
    • US972393
    • 1992-11-06
    • Jeffrey P. Andrews
    • Jeffrey P. Andrews
    • G01D5/353G01B9/02
    • G01D5/35312
    • A device and method are described for measuring changes association with a gap between a lead-in optical fiber and a lead-out optical fiber. A hybrid fiber optic sensor is created by inserting the lead-in and lead-out optical fibers into a small tube such that a gap is provided between the fibers. Laser pulses incident on the gap create two interfacial reflections that interfere with one another, thus providing a method of measuring changes in gap length in the same was as a typical Fabry-Perot type interferometer. Moreover, a reflection from the far end of the lead-out fiber gives gap information in the same way as typical intensity-based sensor. Together the two measurements overcome the limitations that occur when each technique is used separately, and are made possible by means of the above hybrid fiber optic sensor which contains both a Fabry-Perot interferometer portion and an intensity-based sensor portion.
    • 描述了用于测量与引入光纤和引出光纤之间的间隙的变化关联的装置和方法。 通过将引入和引出光纤插入到小管中以在纤维之间提供间隙来产生混合光纤传感器。 入射到间隙上的激光脉冲产生彼此干扰的两个界面反射,因此提供了一种测量间隙长度变化的方法,就像典型的法布里 - 珀罗型干涉仪一样。 此外,来自引出光纤的远端的反射以与典型的基于强度的传感器相同的方式提供间隙信息。 两个测量结合在一起克服了当每个技术被单独使用时发生的限制,并且通过上述混合光纤传感器成为可能,其中包含法布里 - 珀罗干涉仪部分和基于强度的传感器部分。