公开(公告)号：US20040149897A1

公开(公告)日：2004-08-05

申请号：US10605994

申请日：2003-11-12

Applicant: FIBERA, INC.

Inventor： John C. Tsai ,  David W. Wang

IPC: G01J001/04 ,  G01J005/08

CPC classification number: G01B11/161

Abstract: A structure analysis and defect detection system in which a laser light source provides light via optical fiber to fiber Bragg gratings that change resonant frequency as stresses change in the structure. Light at the resonant frequencies of the fiber Bragg gratings is reflected and light of other frequencies is passed. The respective reflected light is directed through a Fabry-Perot interference filter or a fiber interferometer and detected by a photodetector. If the Fabry-Perot interference filter is used, the intensity of the reflected light indicates current stress at a fiber Bragg grating. If the fiber interferometer is used, a beat frequency due to heterodyne interference in the light indicates current stress at the respective fiber Bragg grating. Comparison data for the respective characteristic in the detected light over time permits stress analysis, and comparison of such data with pre-determined limit values permits defect or failure detection.

Abstract translation: 一种结构分析和缺陷检测系统，其中激光光源通过光纤向光纤布拉格光栅提供光，当结构中的应力变化时，其改变谐振频率。 在光纤布拉格光栅的谐振频率处的光被反射并且其它频率的光通过。 相应的反射光被引导通过法布里 - 珀罗干涉滤光器或光纤干涉仪，并由光电检测器检测。 如果使用法布里 - 珀罗干涉滤波器，则反射光强度表示光纤布拉格光栅处的电流应力。 如果使用光纤干涉仪，则由于光中的外差干扰引起的拍频表示各个光纤布拉格光栅处的电流应力。 随着时间的推移，检测光中的各个特性的比较数据允许应力分析，并且将这些数据与预定极限值进行比较允许缺陷或故障检测。

公开(公告)号：US20040118997A1

公开(公告)日：2004-06-24

申请号：US10644137

申请日：2003-08-20

Inventor： Kevin K. Lehmann ,  Peter B. Tarsa ,  Paul Rabinowitz

IPC: G01J001/04 ,  G01J001/42

CPC classification number: G01N21/39 ,  G01J3/42 ,  G01L1/242 ,  G01N21/552 ,  G01N2021/391 ,  G01N2021/7789

Abstract: An apparatus for measurement of strain in a material. The apparatus comprises a passive fiber optic ring; at least one sensor having a predetermined shape and in line with the fiber optic ring, the at least one sensor coupled to the substrate; coupling means for i) introducing a portion of radiation emitted by the coherent source to the passive fiber optic ring and ii) receiving a portion of the radiation resonant in the passive fiber optic ring; a detector for detecting a level of the radiation received by the coupling means and generating a signal responsive thereto; and a processor coupled to the detector for determining a level of the strain inducing into the substrate based on a rate of decay of the signal generated by the detector.

Abstract translation: 用于测量材料中应变的装置。 该装置包括无源光纤环; 至少一个具有预定形状和与光纤环一致的传感器，所述至少一个传感器耦合到所述基板; 耦合装置，用于i）将由相干源发射的辐射的一部分引入无源光纤环，以及ii）接收在被动光纤环中谐振的一部分辐射; 用于检测由所述耦合装置接收的辐射的电平并产生响应于此的信号的检测器; 以及耦合到所述检测器的处理器，用于基于由所述检测器产生的信号的衰减速率来确定诱导到所述衬底中的所述应变的电平。

公开(公告)号：US20040118996A1

公开(公告)日：2004-06-24

申请号：US10323153

申请日：2002-12-18

Inventor： Scott Caldwell ,  Robert McNair

IPC: G01J001/04 ,  G01J005/08

CPC classification number: G01J1/4257

Abstract: A radial power feedback sensor senses the power output of a fiber optic bundle. The fiber optic bundle is arranged generally radially about an axis to carry radiative energy produced by a laser. A spacer is positioned within the fiber optic bundle such that the fiber optic bundle generally surrounds the spacer. The spacer serves to enable the radiative energy to pass therethrough. A photo detector is then disposed adjacent the spacer and is operable to output a signal in response to a measured intensity of the radiative energy passing through the spacer. Accordingly, due to the surrounding of the fiber optic bundle around the photo detector, a greater number of individual photo optic lines are exposed to the photo detector, thereby decreasing the variance between the measure output and the true output of the laser.

Abstract translation: 径向功率反馈传感器感测光纤束的功率输出。 光纤束大致围绕轴径向放置，以承载由激光产生的辐射能。 间隔件定位在光纤束内，使得光纤束通常围绕隔离物。 间隔物用于使辐射能量通过。 然后将光检测器设置在间隔物附近，并且可操作以响应于通过间隔物的辐射能的测量强度来输出信号。 因此，由于光检测器周围的光纤束周围，更多数量的单独的光电路线暴露于光电检测器，从而减小了测量输出和激光器真实输出之间的差异。

公开(公告)号：US20040099800A1

公开(公告)日：2004-05-27

申请号：US10446258

申请日：2003-05-28

Inventor： Nicholas Lagakos ,  Joseph Bucaro

IPC: G01J001/04

CPC classification number: G01L9/0077 ,  G01P15/093

Abstract: A microbend accelerometer comprising a housing having a housing base and a housing top, where housing base has corrugations that protrude from the surface of the housing and an internal mass assembly located between the housing top and the side of the housing base. The internal mass assembly features corrugations that are similar to the housing base corrugations. The microbend accelerometer also features a sensing fiber featuring light propagating therethrough, said sensing fiber disposed between said internal mass and said housing base, said sensing fiber being coupled on each end to at least one lead fiber. Upon an acceleration event along a predetermined axis, inertia causes the internal mass assembly to apply a force on the sensing fiber causing the sensing fiber to distort. This resulting distortion of the sensing fiber causes the intensity of the light propagating through the sensing fiber to modulate in proportion to the magnitude of said acceleration event. The light modulated in the sensing fiber propagates into the lead fiber couple thereto where the modulation is sensed by sensing means coupled to the lead fiber.

Abstract translation: 一种微弯曲加速度计，其包括具有壳体基座和壳体顶部的壳体，其中壳体基部具有从壳体的表面突出的波纹和位于壳体顶部和壳体基座侧面之间的内部质量组件。 内部质量组件具有类似于壳体基部波纹的波纹。 微弯曲加速度计还具有传感光纤，其特征在于光通过其传播，所述感测光纤设置在所述内部质量块和所述壳体基座之间，所述感测光纤在每一端耦合到至少一根引线光纤。 在沿着预定轴线的加速度事件时，惯性使得内部质量组件在感测纤维上施加力，导致感测纤维变形。 传感纤维的这种失真导致通过感测光纤传播的光的强度与所述加速度事件的大小成比例地调制。 在感测光纤中调制的光传播到其中的引线光纤耦合，其中通过耦合到引线光纤的感测装置感测调制。

公开(公告)号：US20040026607A1

公开(公告)日：2004-02-12

申请号：US10244510

申请日：2002-09-17

Applicant: ASIA OPTICAL CO., INC.

Inventor： Chin-Hsiang Wang ,  Chih-Hsiang Lin ,  Tsung-Yueh Tsai

IPC: G01J001/04

CPC classification number: G02B6/29383 ,  G02B6/2937 ,  G02B6/32

Abstract: A highly reliable optical add/drop device is described. The optical add/drop device has an external tube and a ring, wherein the external tube and the ring are made of metallic material. A WDM filter is fixed in the ring. The ring is inserted in the external tube at the middle portion and fixed therein by soft solder technique. A single fiber collimator and a dual fiber collimator are respectively coupled with the opposite surfaces of the filter, and aligned in the external tube. Additionally, the single and dual fiber collimators are also fixed therein by soft solder technique, as two metal tubes respectively hold the single and dual fiber collimators. In the invention, the WDM filter is rigidly fixed to avoid tilting during temperature variation. Moreover, the invention provides an optical add/drop device with low insertion loss and reflection loss.

公开(公告)号：US20030218124A1

公开(公告)日：2003-11-27

申请号：US10346069

申请日：2003-01-17

Inventor： Gregg A. Johnson ,  Bryan L. Althouse ,  Greg Nau ,  Sandeep T. Vohra

IPC: G01J001/04 ,  G01J005/08

CPC classification number: G01K11/3206 ,  G02B6/0218 ,  G02B6/02204 ,  G02B6/29319 ,  G02B6/29395 ,  G02B6/29398 ,  H04B10/07

Abstract: A passive, temperature compensated tunable filter calibration device for a Bragg grating interrogation system. In a first system, a dual-substrate Bragg grating calibration system, the temperature of an array of gratings is estimated using an array of gratings bonded to a common host substrate and a single grating bonded to a material with a different coefficient of thermal expansion. Changes in a common temperature of the substrates is measured by monitoring the difference between shifts of grating wavelength. As a filter voltage is scanned from its lowest to its highest voltage, the voltages are recorded. The second lowest wavelength corresponds to the grating attached to the differing substrate. The voltages are used to calculate a voltage-to-wavelength function for the scanning range of the filter. To compensate for variations in a calibration curve and temperature variations of the calibration array, the temperature is estimated and function re-calculated at every pass of the scanning filter. In a second system, a hydrogen-cyanide wavelength reference absorption cell that absorbs light at discrete wavelengths corresponding to the molecular vibrational mode frequencies of the gas. With a broadband optical light input to the cell, the output displays the spectrum of the input with several narrow dips in the spectra corresponding to the absorption lines of the cell. A first photodetector sees the transmission spectrum and a second sees the reflections from Bragg gratings in a sensing array. The filter drive voltages that coincide with the dips of the transmission spectrum are used to calibrate the voltage-to-wavelength function of the scanning filter. In this system there is no temperature compensation step as the absorption lines are not sensitive to temperature.

Abstract translation: 用于布拉格光栅询问系统的无源温度补偿可调滤波器校准装置。 在第一系统中，双衬底布拉格光栅校准系统，使用结合到公共主机衬底的光栅阵列和结合到具有不同热膨胀系数的材料的单个光栅来估计光栅阵列的温度。 通过监测光栅波长的偏移之间的差异来测量衬底的共同温度的变化。 当滤波器电压从最低电压被扫描到最高电压时，记录电压。 第二低的波长对应于附着于不同基底的光栅。 电压用于计算滤波器扫描范围的电压 - 波长功能。 为了补偿校准曲线的变化和校准阵列的温度变化，在扫描过滤器的每次通过时估计温度并重新计算功能。 在第二系统中，吸收对应于气体的分子振动模式频率的离散波长的光的氰化氢波长参考吸收单元。 通过宽带光输入到单元格，输出显示与对应于单元的吸收线的光谱中的几个窄幅下降的输入光谱。 第一光电检测器看到透射光谱，第二光电检测器看到来自感测阵列中的布拉格光栅的反射。 使用与透射光谱的下降一致的滤波器驱动电压来校准扫描滤波器的电压 - 波长功能。 在该系统中，由于吸收线对温度不敏感，因此没有温度补偿步骤。

公开(公告)号：US20030127587A1

公开(公告)日：2003-07-10

申请号：US10325874

申请日：2002-12-20

Inventor： Eric Udd ,  Sean G. Calvert ,  Whitten L. Schulz ,  W. Marley Kunzler ,  M. Wesley Kunzler

IPC: G01J001/04 ,  G01J005/08

CPC classification number: G01L1/246 ,  G01D5/35383

Abstract: A fiber grating environmental sensing system is described that has the ability to measure strain, vibration, humidity and water content. Fiber gratings are used to measure axial strain to accomplish these goals. An approach is described that uses matched fiber grating sensors and filters to allow for thermal compensation greatly reducing one of the key performance issues facing these systems. The system may be deployed in such applications as roadways and paved surfaces, bridges, buildings and aircraft and spacecraft. Means are described to implement transducers optimized for specific environmental measurements as well as means to demodulate the fiber grating sensors.

Abstract translation: 描述了具有测量应变，振动，湿度和含水量的光纤光栅环境感测系统。 光纤光栅用于测量轴向应变以实现这些目标。 描述了一种使用匹配的光纤光栅传感器和滤波器来实现热补偿的方法，大大减少了这些系统面临的关键性能问题之一。 该系统可以部署在诸如道路和铺设的表面，桥梁，建筑物和飞机和航天器的应用中。 描述了实现针对特定环境测量优化的换能器以及解调光纤光栅传感器的手段。

公开(公告)号：US20030075677A1

公开(公告)日：2003-04-24

申请号：US09797220

申请日：2001-06-11

Inventor： Maurice J. Halmos

IPC: G01J001/04 ,  G01J005/08

CPC classification number: G01H9/002 ,  G01H9/00

Abstract: A multimode remote vibration sensor. The inventive sensor (8) includes a mode locked laser transmitter (10); a receiver (30) adapted to detect signals transmitted by said laser (10) and reflected by an object (22) and a signal processor (40) for analyzing the signals and providing an indication with respect to a vibration of the object (22). The laser is particularly novel as a vibration sensor transmitter inasmuch as it includes a mode locking mechanism. The mode locking mechanism causes the laser to output energy at all modes within the gain profile in phase with one another. The result is a series of tight clean pulses which may be used for range resolved vibration and one-dimensional (high resolution ranging) applications. In a particular embodiment, the present teachings are implemented in a multifunctional laser which, in its operational mode, outputs a mode locked beam for vibration sensing. In the illustrative embodiment, the laser is an erbium or erbium, ytterbium-doped, fiber pumped laser and the mode locking mechanism is a passive quantum well absorber crystal or an active acoustic crystal mounted in the laser cavity. In any event, the return signals are received and processed to extract vibration, range-resolved vibration, one-dimensional profiling or three-dimensional imaging information. To this end, the signal processor includes a range de-multiplexer for organizing the return signals into range bins. For each range bin, the signal processor further includes means for extracting a signal representing vibration for each range bin and a signal representing intensity for each range bin.

Abstract translation: 多模远程振动传感器。 本发明的传感器（8）包括模式锁定激光发射器（10）; 接收器（30），适于检测由所述激光器（10）发送并由物体（22）反射的信号和用于分析信号并提供关于物体（22）的振动的指示的信号处理器（40） 。 激光器作为振动传感器发射器特别新颖，因为其包括模式锁定机构。 模式锁定机构使得激光器在增益分布内的所有模式下彼此相位地输出能量。 结果是一系列紧密清洁脉冲，可用于范围分辨振动和一维（高分辨率测距）应用。 在特定实施例中，本教导在多功能激光器中实现，该多功能激光器在其操作模式下输出用于振动感测的锁模光束。 在说明性实施例中，激光器是铒或铒掺镱纤维泵浦激光器，并且模式锁定机构是安装在激光腔中的无源量子阱吸收体晶体或有源声学晶体。 在任何情况下，接收和处理返回信号以提取振动，范围分辨振动，一维轮廓或三维成像信息。 为此，信号处理器包括范围解复用器，用于将返回信号组织到范围仓中。 对于每个范围仓，信号处理器还包括用于提取表示每个范围仓的振动的信号的装置和表示每个范围仓的强度的信号。

公开(公告)号：US20030071201A1

公开(公告)日：2003-04-17

申请号：US10036274

申请日：2001-12-24

Inventor： Tai-Cheng Yu ,  Yao-Hao Chang

IPC: G01J001/04 ,  G01J005/08

CPC classification number: H04B10/25073 ,  G01J1/1626

Abstract: An optical attenuator (10) includes: an optical splitter (11), a collimator (12), two detectors (51, 52), a first and second reflectors (21, 22), an attenuating element (3) and a driving device (4). The optical splitter includes a ferrule (112) and a GRIN (graded index) lens (113). The collimator is similar to the optical splitter. Input optical signals are transmitted from an input fiber (110) through the optical splitter and are then directed to the first reflector. The optical signals reflected by the first reflector pass through the attenuating element and are subsequently reflected to the collimator by the second reflector. The two detectors receive sampling signals via an input and an output sampling fibers (111, 112). The driving device can drive the attenuating element in response to the attenuation ratio coming from the two detectors.

Abstract translation: 光衰减器（10）包括：分光器（11），准直仪（12），两个检测器（51,52），第一和第二反射器（21,22），衰减元件（3）和驱动装置 （4）。 光分路器包括套圈（112）和GRIN（渐变折射率）透镜（113）。 准直器类似于光分路器。 输入光信号从输入光纤（110）通过光分路器传输，然后被引导到第一反射器。 由第一反射器反射的光信号通过衰减元件，随后通过第二反射器反射到准直器。 两个检测器通过输入和输出采样光纤（111,112）接收采样信号。 驱动装置可以响应于来自两个检测器的衰减比而驱动衰减元件。

公开(公告)号：US20020196994A1

公开(公告)日：2002-12-26

申请号：US10178254

申请日：2002-06-24

Inventor： Thomas Bosselmann ,  Peter Krammer ,  Nils Michael Theune ,  Michael Willsch

IPC: G02B006/00 ,  G01K011/00 ,  G01J001/04

CPC classification number: G01B11/14 ,  G01B11/26 ,  G01D5/35383

Abstract: An optical measuring device includes at least one optical sensor, an optical waveguide connected to the optical sensor, and an evaluation unit. The optical measuring device is intended for an electrical machine including at least one conductor that is pressed into a groove of a base body, the groove having two groove lateral walls. The optical sensor and a part of the optical waveguide that is located in a proximity of the sensor are disposed in the area of the groove on a narrow side of the conductor that faces away from both groove lateral walls.

Abstract translation: 光学测量装置包括至少一个光学传感器，连接到光学传感器的光波导和评估单元。 该光学测量装置用于包括至少一个被压入基体凹槽的导体的电机，该凹槽具有两个凹槽侧壁。 位于传感器附近的光学传感器和光波导的一部分设置在导体的远离两个槽侧壁的狭窄侧的槽的区域中。