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    • 3. 发明授权
    • Measuring system with sweeping comb filter and multiplexer
    • 带梳状滤波器和多路复用器的测量系统
    • US06946645B2
    • 2005-09-20
    • US10733531
    • 2003-12-11
    • Jeffrey A. TarvinRobert J. SchroederRogerio T. RamosTsutomu Yamate
    • Jeffrey A. TarvinRobert J. SchroederRogerio T. RamosTsutomu Yamate
    • G01L1/24G01B11/16
    • G01L1/246
    • High-resolution measurement of a parameter is provided at multiple different locations simultaneously along an optic fiber. Light within a predefined range of wavelengths is transmitted into an optic fiber that contains multiple birefringent fiber optic pressure transducers, each including a Fiber Bragg Grating. Each grating defines a spatially modulated index of refraction and a wavelength that is unique within the system. A sweeping comb filter is used to apply optical comb filtering to light reflected from the transducers so as to pass filtered light having multiple spectral portions, each spectral portion associated with one transducer. The free spectral range of the sweeping comb filter is set to be approximately equal to the spectral range of a single spectral portion. Wavelength division multiplexing is applied to the filtered light so as to separate the spectral portions. The value of a parameter is preferably determined using the spectral spacing of two maxima of spectral intensity in each spectral portion.
    • 沿着光纤同时在多个不同位置提供参数的高分辨率测量。 在预定波长范围内的光被传输到包含多个双折射光纤压力换能器的光纤中,每个包括光纤布拉格光栅。 每个光栅定义了空间调制的折射率和系统内唯一的波长。 扫描梳状滤波器用于对从换能器反射的光进行光梳滤波,以便通过具有多个频谱部分的滤波光,每个光谱部分与一个换能器相关联。 扫描梳状滤波器的自由频谱范围设置为近似等于单个频谱部分的频谱范围。 将波分复用应用于滤波后的光,以分离光谱部分。 优选地,使用每个光谱部分中的光谱强度的两个最大值的光谱间隔来确定参数的值。
    • 5. 发明授权
    • Fiber optic pressure transducers and pressure sensing system
incorporating same
    • 光纤压力传感器和压力传感系统
    • US5841131A
    • 1998-11-24
    • US888566
    • 1997-07-07
    • Robert J. SchroederEric Udd
    • Robert J. SchroederEric Udd
    • G01L1/24G01L11/00G01L11/02H01J5/16
    • G01L1/246G01D3/036G01D5/344G01D5/35316G01L11/025
    • A fiber optic pressure transducer having enhanced resolution and dynamic range includes a fiber optic core having one or more gratings written onto it, a birefringence structure for enhancing the birefringence of the core, and a structure for converting isotropic pressure forces to anisotropic forces on the fiber core. Several different embodiments of prestressing structure are disclosed (both extrinsic and intrinsic). Several different embodiments of structure (both extrinsic and intrinsic) for converting isotropic pressure to anisotropic pressure are also disclosed. The fiber optic pressure transducer according to the invention is advantageously used in conjunction with a light source and a spectral demodulation system in order to detect pressure ambient to the fiber optic pressure transducer based on the wavelength and shift of spectral peaks.
    • 具有增强的分辨率和动态范围的光纤压力传感器包括具有写入其上的一个或多个光栅的光纤芯,用于增强芯的双折射的双折射结构,以及用于将各向同性压力转换成纤维上的各向异性力的结构 核心。 公开了预应力结构的几个不同的实施例(外部和内在的)。 还公开了用于将各向同性压力转换成各向异性压力的结构的两个不同的实施例(外在和内在)。 根据本发明的光纤压力传感器有利地与光源和光谱解调系统结合使用,以便基于光谱峰值的波长和偏移来检测光纤压力传感器的压力环境。
    • 8. 发明授权
    • Methods and apparatus for mechanically enhancing the sensitivity of transversely loaded fiber optic sensors
    • 用于机械增强横向负载光纤传感器灵敏度的方法和装置
    • US06218661B1
    • 2001-04-17
    • US09179146
    • 1998-10-26
    • Robert J. SchroederTsutomu YamateRogerio T. RamosRaghu MadhavanEric Udd
    • Robert J. SchroederTsutomu YamateRogerio T. RamosRaghu MadhavanEric Udd
    • G01J104
    • G01L1/246G01D5/35316G01D5/35377G01K11/3206G01L9/0076G01L11/025
    • The apparatus of the present invention include an optical fiber with a Bragg grating formed along a portion of its core and a mechanical structure arranged adjacent to the Bragg grating for amplifying transverse strain on the fiber in the vicinity of the grating. In particular, the mechanical structure is designed to convert ambient pressure into transverse strain on the fiber in the vicinity of the grating. The methods of the invention include converting pressure into transverse strain on an optical fiber, amplifying the effect of pressure on the transverse strain, measuring pressure by determining the spacing between spectral locations related to peaks (or minimums) of light reflected from an optical grating subjected to transverse strain, and measuring the temperature of the grating by determining the locations of the spectral locations related to the peaks (or minimums) of light reflected from the grating. According to one embodiment, the mechanical structure includes a piston mounted in a transducer body through which the optical fiber passes.
    • 本发明的装置包括具有沿其芯部的一部分形成的布拉格光栅的光纤和布置于布拉格光栅附近的用于放大光栅附近的光纤上的横向应变的机械结构。 特别地,机械结构被设计成在光栅附近将环境压力转换成光纤上的横向应变。 本发明的方法包括将压力转换成光纤上的横向应变,通过确定与从受光纤光栅所反射的光的峰值(或最小值)相关的光谱位置之间的距离来确定压力对横向应变的影响,测量压力 通过确定与从光栅反射的光的峰值(或最小值)相关的光谱位置的位置来测量光栅的温度。 根据一个实施例,机械结构包括安装在光纤通过的换能器主体中的活塞。