公开(公告)号：US20010021299A1

公开(公告)日：2001-09-13

申请号：US09135527

申请日：1998-08-18

Inventor： KIICHI HAMAMOTO

IPC: G02B006/10 ,  G01J001/04 ,  G01J001/42 ,  G01J005/08

CPC classification number: G02B6/12007 ,  G02B6/136 ,  G02B6/2813

Abstract: A semiconductor waveguide photodetector with higher light receiving efficiency, wherein single mode light is transmitted as the insensitive light signal. The semiconductor waveguide photodetector comprises a 1null1 multi mode interference (MMI) light waveguide region, and a couple of single mode waveguide regions, each of which is connected with each end of the multi mode region. The length of the multi mode waveguide region is about 100 nullm and the lengths of the single mode waveguide regions are about 10 nullm. The width of multimode waveguide region is 6 nullm and those of single mode waveguide regions are 1.5 nullm.

Abstract translation: 一种具有较高光接收效率的半导体波导光电检测器，其中单模光作为不敏感光信号传输。 半导体波导光电检测器包括1x1多模干涉（MMI）光波导区域和一对单模波导区域，每个单模波导区域与多模式区域的每一端连接。 多模波导区域的长度约为100μm，单模波导区域的长度约为10um。 多模波导区域的宽度为6μm，单模波导区域的宽度为1.5μm。

公开(公告)号：US20040222364A1

公开(公告)日：2004-11-11

申请号：US10464573

申请日：2003-06-19

Inventor： Robert Kenny ,  Maurice Patrick Whelan

IPC: G01J001/04 ,  G01J005/08

CPC classification number: G01M11/083

Abstract: Methods, and corresponding apparatus, for detecting the occurrence of cracks or fractures are described and claimed. The methods utilize Bragg gratings, and the occurrence of a crack is detected by detecting a change in the reflectance and/or transmittance characteristics of the Bragg grating when the crack is transmitted to it. In addition to merely detecting that a crack has occurred, the methods may also provide information on the position of the fracture along the length of the Bragg grating. This may be achieved by comparing the peak intensities and/or widths of the optical reflectance spectra of the unbroken and broken grating. In certain preferred embodiments the Bragg gratings are interrogated using the combination of a broad band source and an optical spectrum analyser, or a tunable laser source and a broad band detector.

Abstract translation: 描述和要求保护用于检测裂纹或裂缝的发生的方法和相应的装置。 该方法利用布拉格光栅，并且当裂纹传递到其时，通过检测布拉格光栅的反射率和/或透射特性的变化来检测裂纹的发生。 除了仅仅检测到发生裂纹之外，该方法还可以提供关于沿着布拉格光栅的长度的断裂位置的信息。 这可以通过比较不间断和断开的光栅的光学反射光谱的峰值强度和/或宽度来实现。 在某些优选实施例中，使用宽带源和光谱分析仪，或可调激光源和宽带检测器的组合来询问布拉格光栅。

公开(公告)号：US20040159780A1

公开(公告)日：2004-08-19

申请号：US10701057

申请日：2003-11-04

Inventor： Jorg-Achim Fischer ,  Axel Gebhardt

IPC: G01J001/04 ,  G01J005/08

CPC classification number: B41C1/1083 ,  B41J11/0095 ,  B41J13/223 ,  B65H9/20 ,  B65H2511/514 ,  B65H2553/412 ,  B65H2553/442 ,  B65H2701/131 ,  B65H2701/1928 ,  B65H2220/03

Abstract: A device and a method for detecting the edge of a recording material, in particular, a printing plate, in an exposer for recording printing originals includes an exposer having an exposure drum holding the plate, and an exposure head moved axially along the drum and focusing exposure beams onto the plate. An optical fiber is let into the drum surface and an illuminating device, moved axially along the drum, radiates light radially into the fiber. A photodetector at the fiber receives the light radiated therein. Covering the light radiated in with the plate is used to detect the plate edge. Counting cycles of a feed drive moving the illuminating device determines an axial position of the edge. Alternatively, light of a light source is radiated axially into the fiber and the light emitted radially by the fiber is received using an optical detector moved by the feed drive.

Abstract translation: 在用于记录打印原稿的曝光器中用于检测记录材料边缘（特别是印刷版）的装置和方法包括具有保持印版的曝光鼓的曝光器，以及沿滚筒轴向移动的曝光头和聚焦 曝光光束到板上。 将光纤放入滚筒表面，沿着滚筒轴向移动的照明装置将光径向辐射入光纤。 光纤上的光电检测器接收其中辐射的光。 覆盖板上辐射的光用于检测板边缘。 移动照明装置的进给驱动器的计数周期确定边缘的轴向位置。 或者，光源的光轴向辐射到光纤中，并且使用由馈送驱动器移动的光学检测器接收由光纤径向发射的光。

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：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：US20040031924A1

公开(公告)日：2004-02-19

申请号：US10316861

申请日：2002-12-12

Applicant: LG ELECTONICS INC.

Inventor： Seong-Ho Cho ,  In-Seop Lee ,  In-Won Lee ,  Jae-Yong Sung ,  Jay-Ho Choi ,  Kwang-Hyup An ,  Jeong-Ho Lee ,  Young-Sok Nam

IPC: G01J005/08

CPC classification number: G01J5/041 ,  F25D29/00 ,  F25D2400/06 ,  F25D2500/02 ,  F25D2700/123 ,  F25D2700/16 ,  G01J5/08 ,  G01J5/0803 ,  G01J5/0806 ,  G01J5/0862 ,  G01J5/0875 ,  G01J5/089 ,  H01L2224/48091 ,  H01L2924/00014

Abstract: Disclosed are an infrared sensor assembly for precisely detecting a location where a heat source is generated and a refrigerator having the infrared sensor. To this end, comprised are an infrared sensor fixed to a supporting frame for receiving infrared rays generated at the heat source; a case having the infrared sensor mounted therein and an infrared filter mounted at an upper surface thereof, the infrared filter transmits only the infrared rays; and a receiving range limiting means mounted between the infrared sensor and the infrared filter in the case for limiting a range of the infrared rays received into the infrared sensor so as to precisely detect a location of the heat source.

Abstract translation: 公开了一种用于精确地检测产生热源的位置的红外传感器组件和具有红外传感器的冰箱。 为此，包括固定到支撑框架的红外传感器，用于接收在热源处产生的红外线; 安装有红外线传感器的壳体和安装在其上表面的红外线滤光器，红外线滤光器仅透射红外线; 以及在用于限制接收到红外线传感器中的红外线的范围的情况下，安装在红外线传感器和红外线滤光器之间的接收范围限制装置，以便精确地检测热源的位置。

公开(公告)号：US20040000635A1

公开(公告)日：2004-01-01

申请号：US10184155

申请日：2002-06-27

Inventor： Stephan Wielandy ,  Michael Fishteyn

IPC: G01J004/00 ,  G01J005/08

CPC classification number: H04B10/25133 ,  H04B10/077 ,  H04B10/07955 ,  H04B2210/252

Abstract: An automatically adjustable arrangement for tuning the accumulated chromatic dispersion present in an optical communication system uses a dispersion variation-based measuring arrangement to determine both the magnitude and sign of the accumulated dispersion. A relatively small portion of a received optical signal including an unknown amount of chromatic dispersion is tapped off at an optical receiver and a small amount of additional dispersion is added to the tapped-off signal so that nonlinear detection can be used to determine both the magnitude and sign of the dispersion present in the transmission signal. This information is then fed back to a tunable dispersion compensator to provide the real-time, automatic correction to the dispersion present in the system.

Abstract translation: 用于调整存在于光通信系统中的累积色散的自动调整布置使用基于色散变化的测量装置来确定累积色散的幅度和符号。 包含未知量的色散的接收光信号的相对小部分在光接收机处被分接，并且少量的附加色散被添加到分接信号，使得可以使用非线性检测来确定幅度 以及发送信号中存在的色散的符号。 然后将该信息反馈到可调​​谐色散补偿器，以对系统中存在的色散提供实时的自动校正。

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。