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1.发明授权Method and apparatus for correcting systematic error in a wavelength measuring device 有权用于校正波长测量装置中的系统误差的方法和装置公开(公告)号：US06403949B1
公开(公告)日：2002-06-11
申请号：US09448003
申请日：1999-11-23
IPC分类号： G01B910
摘要： A method and apparatus for compensating for systematic error in a wavelength measuring device that provides values for the wavelengths reflected from one or more optical fibers in which fiber Bragg gratings (FBGs) serve as sensors. A high-precision temperature sensing and measuring circuit is used to measure the temperature of a reference FBG that also provides light at some wavelength to the wavelength measuring device. The wavelength reflected by the reference FBG changes with temperature in a way that is known. The (value of) the wavelength being reflected from the reference FBG is then provided to a dynamic compensator, which also receives the wavelengths of light reflected from the sensor FBGs, and the dynamic compensator adjusts the wavelengths of the sensor FBGs using a correction based on the correction required to adjust the value of the wavelength of the reference FBG as measured by the wavelength measuring device.
摘要翻译： 一种用于补偿波长测量装置中的系统误差的方法和装置，其提供从光纤布拉格光栅（FBG）用作传感器的一个或多个光纤反射的波长的值。 使用高精度温度感测和测量电路来测量也向波长测量装置提供某种波长的光的参考FBG的温度。 由参考FBG反射的波长以已知的方式随温度变化。 然后将从参考FBG反射的波长的（值）提供给动态补偿器，动态补偿器也接收从传感器FBG反射的光的波长，并且动态补偿器使用基于以下的校正来调整传感器FBG的波长 调整由波长测量装置测量的参考FBG的波长值所需的校正。
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公开(公告)号：US06346702B1
公开(公告)日：2002-02-12
申请号：US09458911
申请日：1999-12-10
IPC分类号： G01J104
CPC分类号： H04B10/675
摘要： A fiber Bragg grating peak detection system has a broadband source that provides a broadband optical signal, a fiber Bragg grating and a variable threshold and/or grating profile peak detection unit. The fiber Bragg grating responds to the broadband optical signal, and further responds to a physical parameter, for providing a fiber Bragg grating optical signal containing information about the physical parameter. The variable threshold or grating profile peak detection unit responds to the fiber Bragg grating optical signal, for providing a variable threshold or grating profile peak detection unit signal containing information about a peak detected in the fiber Bragg grating optical signal that is used to determine the physical parameter. The variable threshold or grating profile peak detection unit detects the peak using either a variable threshold peak detection or a grating profile peak detection, or a combination thereof. During the variable threshold peak detection, the variable threshold or grating profile peak detection unit determines a respective local threshold value for each wavelength over a spectral band of the fiber Bragg grating optical signal. During the grating profile peak detection, the detection unit determines a grating profile on each side of the peak.
摘要翻译： 光纤布喇格光栅峰值检测系统具有提供宽带光信号的宽带光源，光纤布拉格光栅和可变阈值和/或光栅轮廓峰值检测单元。 光纤布拉格光栅响应于宽带光信号，并且进一步响应物理参数，用于提供包含关于物理参数的信息的光纤布拉格光栅光信号。 可变阈值或光栅轮廓峰值检测单元响应于光纤布拉格光栅光信号，用于提供可变阈值或光栅轮廓峰值检测单元信号，该信号包含关于在光纤布拉格光栅光信号中检测到的峰值的信息，该信号用于确定物理 参数。 可变阈值或光栅轮廓峰值检测单元使用可变阈值峰值检测或光栅轮廓峰值检测或其组合来检测峰值。 在可变阈值峰值检测期间，可变阈值或光栅轮廓峰值检测单元在光纤布拉格光栅光信号的光谱带上确定每个波长的相应局部阈值。 在光栅轮廓峰值检测期间，检测单元确定峰顶两侧的光栅轮廓。
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公开(公告)号：US06804693B2
公开(公告)日：2004-10-12
申请号：US09929423
申请日：2001-08-14
IPC分类号： G06F700
CPC分类号： G01R19/04 , G01L1/246 , G01R19/2509
摘要： A method and corresponding apparatus for determining the centroid (Vc) of a waveform signal being sampled at a set of parameter values (Vi, i=1, . . . , n) yielding a corresponding set of sampled amplitudes (Ai, i=1, . . . , n), each parameter value and corresponding amplitude forming a sampled point (Vi, Ai), the method including the steps of: selecting an amplitude at which to create an interpolated point; interpolating a first parameter value corresponding to the amplitude selected in the step of selecting an amplitude; and performing a centroid calculation using only the sampled points with an amplitude greater than a predetermined threshold. The waveform is sometimes sampled in the presence of background noise, and the method sometimes also includes: estimating the background (Bi) for each value in the set of parameter values at which sampling is performed; and reducing the amplitude (Ai) of each sampled amplitude by the background (Bi) so estimated.
摘要翻译： 一种用于确定在一组参数值（Vi，i = 1，...，n）上采样的波形信号的质心（Vc）的方法和相应装置，产生一组相应的采样幅度（Ai，i = 1 ，...，n），每个参数值和对应的幅度形成采样点（Vi，Ai），所述方法包括以下步骤：选择创建内插点的幅度; 内插与在选择幅度的步骤中选择的幅度对应的第一参数值; 以及仅使用振幅大于预定阈值的采样点进行质心计算。 有时在有背景噪声的情况下采样波形，并且该方法有时还包括：对进行采样的参数值集合中的每个值估计背景（Bi）; 并且将每个采样振幅的振幅（Ai）减小所估计的背景（Bi）。
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4.发明授权公开(公告)号：US06529923B2
公开(公告)日：2003-03-04
申请号：US09087447
申请日：1998-05-29
IPC分类号： G06F700
CPC分类号： G01R19/2509 , G01R19/04 , G01R23/02
摘要： Prior to performing a centroid calculation on a waveform signal that is discretely sampled at a limited number of sample points, the last sample point (VN, AN) is eliminated if the magnitude of the amplitude at the first sample point (A1) is greater than the last sample point (AN), and the difference in magnitude between the first and last sample points (A1−AN) is greater than the difference in magnitude between the second to last sample point and the first sample point (AN−1−A1). The first sample point (V1, A1) is eliminated prior to the centroid calculation if the magnitude of the amplitude at the last sample point (AN) is greater than the first sample point (A1), and the difference in magnitude between the last and first sample points (AN−A1) is greater than the difference in magnitude between the second sample point and the last sample point (A2−AN). In a second embodiment of the invention, a first centroid calculation is performed using a set of samples in which one side of the waveform signal has the lowest amplitude value sample. Sample values on the side of the waveform initially having the lowest amplitude value are then eliminated until the opposing side of the waveform has the lowest amplitude value sample. A second centroid calculation is then performed and the two centroid calculations are averaged together to arrive at an average centroid calculation. In a third embodiment of the invention, the amplitude components of the waveform sample values are normalized to the lowest amplitude value sample point and a first centroid calculation is performed on the normalized waveform signal. Next, the waveform is normalized to the lowest amplitude value sample point on the other side of the waveform signal and a second centroid calculation is performed. The two centroid calculations are then averaged to provide an averaged normalized centroid calculation.
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公开(公告)号：US5818585A
公开(公告)日：1998-10-06
申请号：US810167
申请日：1997-02-28
CPC分类号： G01D5/35383
摘要： A system and method for providing accurate measurements of the reflected wavelengths from multiple strings of fiber Bragg grating (FBG) elements using a single scanning optical filter and an isolated duplicate reference string of FBG elements. A reference string of FBG elements permits precise long-term wavelength determination of sensors by providing real-time adaptive calibration adjustments to correct for any nonlinearities in the response of the single scanning optical filter.
摘要翻译： 一种用于使用单个扫描光学滤波器和FBG元件的隔离重复参考串提供来自多个光纤布拉格光栅（FBG）元件串的反射波长的精确测量的系统和方法。 FBG元件的参考串允许通过提供实时自适应校准调整来校正传感器的长期波长确定波长，以校正单个扫描光学滤波器的响应中的任何非线性。
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公开(公告)号：US06310990B1
公开(公告)日：2001-10-30
申请号：US09519802
申请日：2000-03-06
IPC分类号： G02B600
CPC分类号： G02B6/022 , G01D5/35316 , G01D5/35377 , G01L1/246 , G02F1/011
摘要： A tunable optical device has a compression tuned optical structure and a displacement sensor. The compression tuned optical structure responds to an optical signal, and further responds to a displacement sensor signal, for providing a compression tuned optical structure signal containing information about a change in an optical characteristic of the compression tuned optical structure, and for also further providing an excitation caused by a change in a displacement of the compression tuned optical structure. The displacement sensor responds to the excitation, for providing a displacement sensor signal containing information about the change in the displacement of the compression tuned optical structure. The compression tuned optical structure may be in the form of a dogbone structure that is an all-glass compression unit having wider end portions separated by a narrower intermediate portion. The displacement sensor includes a capacitance sensor affixed to the compression tuned optical structure for measuring a change in capacitance between two parallel and opposing plates that depends on a change in a gap or an area with respect to the two parallel and opposing plates.
摘要翻译： 可调谐光学器件具有压缩调谐光学结构和位移传感器。 压缩调谐光学结构响应光信号，并进一步响应位移传感器信号，用于提供包含关于压缩调谐光学结构的光学特性的变化的信息的压缩调谐光学结构信号，并且还进一步提供 由压缩调谐光学结构的位移的变化引起的激励。 位移传感器响应于激励，用于提供包含关于压缩调谐光学结构的位移变化的信息的位移传感器信号。 压缩调谐光学结构可以是狗骨架结构的形式，其是具有由较窄中间部分分开的较宽端部的全玻璃压缩单元。 位移传感器包括固定到压缩调谐光学结构上的电容传感器，用于测量取决于相对于两个平行和相对的板的间隙或面积的变化的两个平行板和相对板之间的电容变化。
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公开(公告)号：US06563968B2
公开(公告)日：2003-05-13
申请号：US09950509
申请日：2001-09-10
IPC分类号： G02B600
CPC分类号： G02B6/022 , G01D5/35316 , G01D5/35377 , G01L1/246 , G02F1/011
摘要： A tunable optical device has a compression tuned optical structure and a displacement sensor. The compression tuned optical structure responds to an optical signal, and further responds to a displacement sensor signal, for providing a compression tuned optical structure signal containing information about a change in an optical characteristic of the compression tuned optical structure, and for also further providing an excitation caused by a change in a displacement of the compression tuned optical structure. The displacement sensor responds to the excitation, for providing a displacement sensor signal containing information about the change in the displacement of the compression tuned optical structure. The compression tuned optical structure may be in the form of a dogbone structure that is an all-glass compression unit having wider end portions separated by a narrower intermediate portion. The displacement sensor includes a capacitance sensor affixed to the compression tuned optical structure for measuring a change in capacitance between two parallel and opposing plates that depends on a change in a gap or an area with respect to the two parallel and opposing plates.
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8.发明授权Optical system featuring chirped Bragg grating etalon for providing precise reference wavelengths 有权具有啁啾Bragg光栅标准具的光学系统，用于提供精确的参考波长公开(公告)号：US07180601B1
公开(公告)日：2007-02-20
申请号：US09703823
申请日：2000-11-01
IPC分类号： G01B9/02
CPC分类号： G01J3/18 , G01J3/1895 , G01J2003/2866
摘要： An optical system has a broadband source and a chirped Bragg grating etalon. In operation, the broadband source provides a broadband optical signal. The chirped Bragg grating etalon responds to the broadband optical signal, for providing a chirped Bragg grating etalon optical signal having a precise set of the optical reference signals. The chirped Bragg grating etalon may include a pair of chirped Bragg gratings. The precise set of the optical reference signals is determined by the spacing of the chirped Bragg gratings of the chirped Bragg grating etalon. The precise set of the optical reference signals includes a series of peaks covering most of a source spectral width of the broad optical source signal with the power at the beginning and end of the spectrum passed unaffected by the chirped Bragg grating etalon due to the limited bandwidth thereof.
摘要翻译： 光学系统具有宽带源和啁啾布拉格光栅标准具。 在操作中，宽带源提供宽带光信号。 啁啾的布拉格光栅标准具响应宽带光信号，用于提供具有精确的一组光参考信号的啁啾布拉格光栅标准具光信号。 啁啾的布拉格光栅标准具可以包括一对啁啾的布拉格光栅。 光学参考信号的精确集合由啁啾布拉格光栅标准具的啁啾布拉格光栅的间隔确定。 光学参考信号的精确集合包括覆盖宽光源信号的大部分源光谱宽度的一系列峰值，其中光谱开始和结束处的功率不受啁啾布拉格光栅标准具的影响，由于有限的带宽 其中。
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9.发明授权Fiber bragg grating reference sensor for precise reference temperature measurement 有权光纤布拉格光栅参考传感器，用于精确的参考温度测量公开(公告)号：US06462329B1
公开(公告)日：2002-10-08
申请号：US09448367
申请日：1999-11-23
IPC分类号： G01J104
摘要： A fiber Bragg grating reference module provides a precise temperature reference for a temperature probe, including a thermistor, located in close proximity thereto, and includes an optical fiber having a fiber Bragg grating therein, a glass element and a reference housing. The fiber Bragg grating has two ends and with a coefficient of thermal expansion. The glass element anchors the two ends of the fiber Bragg grating, and has a substantially similar coefficient of thermal expansion as the coefficient of thermal expansion of the fiber Bragg grating to ensure that the glass element does not substantially induce strain on the fiber Bragg grating as the ambient temperature changes. The reference housing has a cavity and also has a means for receiving and affixing one end of the fiber Bragg grating and for suspending the fiber Bragg grating in the cavity leaving the other end of the fiber Bragg grating free to move as the ambient temperature changes without inducing strain in the fiber Bragg grating. The glass element includes a glass tube collapsed over the entire length of the fiber Bragg grating. Alternatively, the glass element includes a glass tube locally collapsed at the two ends of the fiber Bragg grating over a part of length of the fiber Bragg grating.
摘要翻译： 光纤布拉格光栅参考模块为温度探头提供精确的温度基准，包括位于其附近的热敏电阻，并包括其中具有光纤布拉格光栅的光纤，玻璃元件和参考外壳。 光纤布拉格光栅具有两端和热膨胀系数。 玻璃元件锚固光纤布拉格光栅的两端，并且具有与光纤布拉格光栅的热膨胀系数基本相似的热膨胀系数，以确保玻璃元件基本上不会在光纤布拉格光栅上引起应变 环境温度变化。 参考壳体具有空腔并且还具有用于接收和固定光纤布拉格光栅的一端并用于将光纤布拉格光栅悬挂在腔中的装置，离开光纤布拉格光栅的另一端随着环境温度的变化而自由移动，而没有 在光纤布拉格光栅中诱发应变。 玻璃元件包括在光纤布拉格光栅的整个长度上折叠的玻璃管。 或者，玻璃元件包括在纤维布拉格光栅的长度的一部分上在纤维布拉格光栅的两端局部塌缩的玻璃管。
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公开(公告)号：US20220034844A9
公开(公告)日：2022-02-03
申请号：US16165069
申请日：2018-10-19
申请人： John Biesak , Douglas H. Loose , Michael A. Davis
发明人： John Biesak , Douglas H. Loose , Michael A. Davis
IPC分类号： G01N29/024 , G01N29/24 , G01N29/42 , G01N29/44 , G01N29/50 , G01F1/74 , G01N33/38 , G01F1/708
摘要： Apparatus is provided having an acoustic-based air probe with an acoustic source configured to provide an acoustic signal into a mixture of concrete; and an acoustic receiver configured to be substantially co-planar with the acoustic source, to respond to the acoustic signal, and to provide signaling containing information about the acoustic signal injected into the mixture of concrete.
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