公开(公告)号：WO2004079306A9

公开(公告)日：2004-10-28

申请号：PCT/US2004006800

申请日：2004-03-04

Applicant: CIDRA CORP

Inventor： SULLIVAN JAMES ,  BAILEY TIMOTHY J ,  DAVIS MICHAEL A ,  FERNALD MARK R ,  NIEZGORSKI RICHARD

IPC: B06B1/06 ,  G01F1/66 ,  G01F1/74 ,  H01L41/053

CPC classification number: G01F1/74 ,  G01F1/662 ,  G01F1/666 ,  G01F1/7082

Abstract: An apparatus is provided that measures the speed of sound and/or vortical disturbances propagating in a fluid flow to determine a parameter of the flow propagating through a pipe. The apparatus includes a sensing device that includes an array of pressure sensors used to measure the acoustic and convective pressure variations in the flow to determine a desired parameter. The sensing device includes a unitary strap having a plurality of bands disposed parallel to each other. The bands are interconnected by cross members to maintain the bands a predetermined distance apart. . Each of the bands having a strip of piezoelectric film material mounted along a substantial length of the bands. The piezoelectric film material provides a signal indicative of the unsteady pressures within the pipe. The sensing device includes a conductive shield around the multi-band strap and the piezoelectric film material to provide a grounding shield. A cover is disposed around the entire assembly to protect it from environmental influences. The unitary multi-band strap permits the sensors to be accurate spaced apart during manufacturing and ensures fast and simple installation of the meter on the pipe.

Abstract translation: 提供一种设备，其测量在流体流中传播的声音和/或旋涡干扰的速度，以确定通过管传播的流的参数。 该装置包括传感装置，该传感装置包括用于测量流动中的声学和对流压力变化以确定期望参数的压力传感器阵列。 感测装置包括具有彼此平行设置的多个带的单一带。 这些带通过横向构件相互连接以将带保持预定的距离。 。 每个带具有沿带的大部分长度安装的压电薄膜材料带。 压电薄膜材料提供指示管内不稳定压力的信号。 感测装置包括围绕多带条带和压电薄膜材料的导电屏蔽以提供接地屏蔽。 在整个组件周围设置盖子以保护其免受环境影响。 一体式多频带表带允许传感器在制造过程中准确分开，并确保仪表在管道上的快速简单安装。

公开(公告)号：WO02075405A8

公开(公告)日：2003-04-10

申请号：PCT/US0207763

申请日：2002-03-16

Applicant: CIDRA CORP

Inventor： DAVIS MICHAEL A ,  BAILEY TIMOTHY J ,  PUTNAM MARTIN A ,  FERNALD MARK R

IPC: G02B6/26 ,  G02B6/34 ,  G02F1/01 ,  G02B6/293 ,  G02B6/16

CPC classification number: G02B6/4215 ,  G02B6/02042 ,  G02B6/02057 ,  G02B6/022 ,  G02B6/266 ,  G02B6/2861 ,  G02B6/29319 ,  G02B6/2932 ,  G02B6/29322 ,  G02B6/29334 ,  G02B6/29352 ,  G02B6/29353 ,  G02B6/29383 ,  G02B6/29395 ,  G02B6/29398 ,  G02F1/0115 ,  G02F2201/307 ,  G02F2203/60

Abstract: A multi-core optical waveguide 10, such as a dual core waveguide, having a pair of cores 12,14 disposed within a cladding 13 is provided. The cores are equally spaced and parallel to the axis of the waveguide. The cores can be spaced to provide optical coupling between the cores. The outer dimension d2 of the cladding 13 is at least about 0.3 mm; and the outer dimension d1 of the cores 12,14 is such that they propagate in a single spatial mode. The multi-core waveguide may be used in many optical components, such as a bandpass filter and an optical add/drop multiplexer. For the bandpass filter, a Bragg grating having the same reflection wavelength is written into both cores at substancially the same distance from the imput end 86,87 of the cores. The cores 12,14 have the same propagation constants to permit coupling of all the energy of the WDM input signal 84 from one core to the other. The length of the waterguide 100 is substantially equal to the coupling length (Lc), provided all the energy of the through wavelengths is desired at the output end of the second core. Generally, the grating 82 is substantially centered in the waveguide at Lc/2.

Abstract translation: 提供多芯光波导10，例如具有设置在包层13内的一对芯12,14的双芯波导。 这些芯是等间距的并且平行于波导的轴线。 芯可以间隔开以提供芯之间的光耦合。 包层13的外部尺寸d2至少约为0.3mm; 并且芯12,14的外部尺寸d1使得它们以单个空间模式传播。 多芯波导可以用在许多光学部件中，例如带通滤波器和光分插复用器。 对于带通滤波器，具有相同反射波长的布拉格光栅在距芯的输入端86,87大致相同的距离处被写入两个芯中。 核心12,14具有相同的传播常数，以允许将WDM输入信号84的所有能量从一个核心耦合到另一个核心。 只要在第二核心的输出端需要所有贯穿波长的能量，则水导100的长度基本上等于耦合长度（Lc）。 通常，光栅82基本上在Lc / 2处居中在波导中。

公开(公告)号：WO0237625A3

公开(公告)日：2002-09-26

申请号：PCT/US0147356

申请日：2001-11-06

Applicant: CIDRA CORP

Inventor： FERNALD MARK R ,  BAILEY TIMOTHY J ,  MILLER MATTHEW B ,  SULLIVAN JAMES M ,  DAVIS MICHAEL A ,  BRUCATO ROBERT N ,  PUTNAM MARTIN A ,  KRINGLEBOTN JON THOMAS ,  KERSEY ALAN D ,  SANDERS PAUL E

IPC: H01S3/063 ,  H01S3/067 ,  H01S3/08 ,  H01S3/1055

CPC classification number: H01S3/0675 ,  G02B6/022 ,  H01S3/0635 ,  H01S3/08009 ,  H01S3/1055

Abstract: A compression-tuned bragg grating-based laser includes a tunable optical element 20,600 which includes either an optical fiber 10 having at least one Bragg grating 12 impressed therein encased within and fused to at least a portion of a glass capillary tube 20 or a large diameter waveguide grating 600 having a core and a wide cladding. Light 14 is incident on the grating 12 and light 16 is reflected at a reflection wavelength lambda 1. The tunable element 20,600 is axially compressed which causes a shift in the reflection wavelength of the grating 12 without buckling the element. The shape of the element may be other geometries (e.g., a"dogbone" shape) and(or more than one grating or pair of gratings may be used and more than one fiber 10 or core 612 may be used. At least a portion of the element may be doped between a pair of gratings 150,152, to form a compression-tuned laser or the grating 12 or gratings 150,152 may be constructed as a tunable DFB laser. Also, the element 20 may have an inner tapered region 22 or tapered (or fluted) sections 27. The compression may be done by a PZT, stepper motor, hydraulic device or other actuator.

Abstract translation: 压缩调谐基于布拉格光栅的激光器包括可调谐光学元件20,600，其包括具有至少一个印刷在其中的布拉格光栅12的光纤10，该光栅10被包裹在玻璃毛细管20的至少一部分中并且被熔合到玻璃毛细管20的至少一部分上， 波导光栅600具有一个芯和一个宽的包层。 光14入射到光栅12上，并且光16以反射波长λ1被反射。可调元件20,600被轴向压缩，这引起光栅12的反射波长的偏移而不使元件屈曲。 元件的形状可以是其他几何形状（例如，“狗骨形”），并且（或者可以使用多于一个的光栅或光栅对，并且可以使用多于一个的光纤10或芯612.至少一部分的 该元件可以被掺杂在一对光栅150,152之间以形成压缩调谐激光器，或者光栅12或光栅150,152可以被构造为可调DFB激光器。而且，元件20可以具有内锥形区域22或锥形 或凹槽）部分27.压缩可以通过PZT，步进电机，液压装置或其他致动器完成。

公开(公告)号：WO0033048A3

公开(公告)日：2000-11-16

申请号：PCT/US9928812

申请日：1999-12-04

Applicant: CIDRA CORP

Inventor： HAY ARTHUR ,  BAILEY TIMOTHY J ,  MARON ROBERT J ,  FERNALD MARK R ,  PRUETT PHILLIP EDMUND ,  KERSEY ALAN D ,  DAIGLE GUY ,  DIDDEN F KEVIN ,  DAVIS ALLEN R ,  DAVIS MICHAEL A

IPC: G01L11/02 ,  G01L1/24 ,  G01L9/00

CPC classification number: G01L11/025

Abstract: A fiber optic Bragg grating pressure sensor particularly suited for measuring ambient pressure of a fluid includes a pressuring detecting device (12) such as a glass element whose elastic deformation is proportional to applied pressure. An optical fiber (28) with an integral first grating (33) is attached to the device (12) such that elastic deformation of the device (12) generates a corresponding deformation in the grating (33) and thus a corresponding change of the characteristic reflectance wavelength of the grating (33). A second grating (35) may be formed near the pressure detecting device (12) so as to sense ambient temperature but not be affected by deformation of the device (12). The second grating (35) has a second characteristic reflectance wavelength whose variation as a function of temperature is known. As a result, device (12) deformation or changes in the reflection wavelength of the grating (33) due to temperature can be cancelled from the shift in reflection wavelength of the first grating (33) so that the sensed pressure can be determined. Also, the fiber (28) may have more than one grating or be doped at least between a pair of gratings (160, 162), to form a fiber laser or a DFB fiber laser which lasing wavelength changes with changing pressure.

Abstract translation: 特别适用于测量流体环境压力的光纤布拉格光栅压力传感器包括加压检测装置（12），例如玻璃元件，其弹性变形与所施加的压力成比例。 具有集成的第一光栅（33）的光纤（28）附接到装置（12），使得装置（12）的弹性变形在光栅（33）中产生相应的变形，因此特性的相应变化 光栅（33）的反射波长。 可以在压力检测装置（12）附近形成第二光栅（35），以便感测环境温度，但不受设备（12）的变形的影响。 第二光栅（35）具有第二特征反射波长，其变化作为温度的函数是已知的。 结果，可以从第一光栅（33）的反射波长的偏移中抵消装置（12）由于温度而导致的光栅（33）的反射波长的变形或变化，从而可以确定感测的压力。 此外，光纤（28）可以具有多于一个光栅或者至少在一对光栅（160,162）之间被掺杂，以形成激光波长随着变化的压力而变化的光纤激光器或DFB光纤激光器。

公开(公告)号：WO0037914A9

公开(公告)日：2001-03-29

申请号：PCT/US9928868

申请日：1999-12-06

Applicant: CIDRA CORP

Inventor： FERNALD MARK R ,  BAILEY TIMOTHY J ,  MILLER MATTHEW B ,  SULLIVAN JAMES M ,  DUNPHY JAMES R ,  DAVIS MICHAEL A ,  KERSEY ALAN D ,  WRIGHT CHRISTOPHER J ,  PUTNAM MARTIN A ,  BRUCATO ROBERT N ,  SANDERS PAUL E

IPC: G01L1/24 ,  G01J3/18 ,  G01L11/00 ,  G01L11/02 ,  G02B5/18 ,  G02B6/00 ,  G02B6/02

CPC classification number: G01L11/025

Abstract: A fiber grating pressure sensor includes an optical sensing element (20, 600) which includes an optical fiber (10) having a Bragg grating (12) impressed therein which is encased within and fused to at least a portion of a glass capillary tube (20) and/or a large diameter waveguide grating (600) having a core and a wide cladding and which has an outer transverse dimension of at least 0.3 mm. Light (14) is incident on the grating (12) and light (16) is reflected from the grating (12) at a reflection wavelength lambda 1. The sensing element (20, 600) may be used by itself as a sensor or located within a housing (48, 60, 90, 270, 300). When external pressure P increases, the grating (12) is compressed and the reflection wavelength lambda 1 changes.

Abstract translation: 光纤光栅压力传感器包括光学传感元件（20,600），光学传感元件（20,600）包括其中印有布拉格光栅（12）的光纤（10），其被封装在玻璃毛细管（20）的至少一部分内 ）和/或具有芯和宽包层并且具有至少0.3mm的外横向尺寸的大直径波导光栅（600）。 光（14）入射到光栅（12）上，光（16）以反射波长λ1从光栅（12）反射。感测元件（20,600）可以自身用作传感器或定位 在一个房屋内（48,60,90,270,300）。 当外部压力P增加时，光栅（12）被压缩，反射波长λ1改变。

公开(公告)号：WO0037976A3

公开(公告)日：2001-02-22

申请号：PCT/US9928813

申请日：1999-12-04

Applicant: CIDRA CORP

Inventor： PUTNAM MARTIN A ,  BAILEY TIMOTHY J ,  MILLER MATTHEW B ,  SULLIVAN JAMES M ,  DAVIS MICHAEL A ,  FERNALD MARK R ,  WRIGHT CHRISTOPHER J

IPC: G02B5/18 ,  G01L1/24 ,  G02B6/00 ,  G02B6/02 ,  G02B6/10 ,  G02B6/34 ,  G02F1/00 ,  G02B6/16

CPC classification number: G02B6/02133 ,  G02B2006/02161

Abstract: A method and apparatus for forming a tube-encased fiber grating includes an optical fiber (28) which is encased within and fused to at least a portion of a glass capillary tube (120) and a substantially transparent index-matching medium (122), such as an optically flat window, having an optically flat surface (126) adjacent to the tube (120). A substantially transparent index-matching intermediate material (e.g., UV transparent oil) (124) is used between the window (22) and the tube (120) to substantially eliminate the interface between the tube (120) and the medium (122). A pair of writing beams (26, 34) are incident on and pass through the medium (122), the tube (120) and intersect and interfere in a region (30) on the fiber (28). Also, the width (Wb) of the writing beams (26,34) may be set to be less than the width (Woil) of the intermediate material (124) to eliminate surface damage (ablations) of the tube (120). Alternatively, the medium (122) may have a geometry to eliminate surface ablations (e.g., a collar shape) and/or to match the shape of the tube (120). More than one grating or pair of gratings may be written in the tube-encased fiber or one or more gratings may be formed in multiple fibers (28, 250) encased in the tube (120). Further, high intensity writing beams (26, 34) on the fiber (28) may be achieved by having the medium (122) have a predetermined thickness (T).

Abstract translation: 用于形成管封装光纤光栅的方法和装置包括：光纤（28），其被包裹在玻璃毛细管（120）和基本上透明的折射率匹配介质（122）的至少一部分内并且熔合到其中， 例如光学平面窗口，其具有与管（120）相邻的光学平坦表面（126）。 在窗（22）和管（120）之间使用基本上透明的折射率匹配中间材料（例如UV透明油）（124），以基本上消除管（120）和介质（122）之间的界面。 一对书写光束（26,34）入射并通过介质（122），管（120）并交叉并干涉在光纤（28）上的区域（30）中。 此外，书写光束（26,34）的宽度（Wb）可以设定为小于中间材料（124）的宽度（Woil），以消除管（120）的表面损伤（烧蚀）。 或者，介质（122）可以具有消除表面消融（例如，套环形状）和/或匹配管（120）的形状的几何形状。 可以将多于一个的光栅或一对光栅写入管封装的光纤中，或者一个或多个光栅可以形成在封装在管（120）中的多个光纤（28,250）中。 此外，纤维（28）上的高强度书写光束（26,34）可以通过使介质（122）具有预定厚度（T）来实现。

公开(公告)号：WO2008060942A2

公开(公告)日：2008-05-22

申请号：PCT/US2007084077

申请日：2007-11-08

Applicant: CIDRA CORP ,  DAVIS MICHAEL A

Inventor： DAVIS MICHAEL A

IPC: G01F1/708 ,  G01F1/66 ,  G01F1/712 ,  G01F1/74

CPC classification number: G01F1/7082 ,  G01F1/667 ,  G01F1/712 ,  G01F1/74

Abstract: A method and apparatus for measuring at least one parameter of a fluid flowing through an internal passage of an elongated body is provided. The internal passage is disposed between a first wall and a second wall, and the first wall and the second wall each include an interior surface and an exterior surface. The method includes the steps of providing an array of at least two ultrasonic sensor units, operating the sensor units to transmit ultrasonic signals at one or more frequencies substantially coincident with at least one frequency at which the transmitted ultrasonic signals resonate within the first wall, receiving the ultrasonic signals with the sensor units, and processing the received ultrasonic signals to measure the at least one parameter of fluid flow within the internal passage.

Abstract translation: 提供一种用于测量流过细长体的内部通道的流体的至少一个参数的方法和装置。 内部通道设置在第一壁和第二壁之间，并且第一壁和第二壁各自包括内表面和外表面。 该方法包括以下步骤：提供至少两个超声波传感器单元的阵列，操作传感器单元以一个或多个频率发射超声波信号，该频率与至少一个频率基本一致，在该频率处发射的超声波信号在第一壁内共振，接收 所述超声波信号与所述传感器单元相关联，并且处理所接收的超声波信号以测量所述内部通道内的流体流动的所述至少一个参数。

公开(公告)号：WO0218983A3

公开(公告)日：2003-03-06

申请号：PCT/US0125866

申请日：2001-08-17

Applicant: CIDRA CORP

Inventor： KERSEY ALAN D ,  DAVIS MICHAEL A ,  PUTNAM MARTIN A ,  BAILEY TIMOTHY J

IPC: G02B6/34 ,  H04J14/02 ,  G02B5/20

CPC classification number: G02B6/4215 ,  G02B6/2932 ,  G02B6/29322 ,  G02B6/29395 ,  H04J14/0209 ,  H04J14/021 ,  H04J14/0213 ,  H04J14/0216 ,  H04J14/0219

Abstract: A tunable optical filter filters is provided that has a pair of tunable Bragg grating units optically coupled to respective ports of a 4-port circulator for filtering a selected wavelength band or channel of light from a DWDM input light. Each grating unit includes an array of Bragg gratings written or embedded within a respective tunable optical element to provide a tunable optical filter that functions over a wide spectral range greater than the tunable range of each grating element. The reflection wavelengths of the array of gratings of each respective gratings element is spaced at a predetermined spacing, such that when a pair of complementary gratings of the grating elements are aligned, the other complementary gratings are misaligned. Both of the optical elements may be tuned to selectively align each complementary grating over each corresponding spectral range.

Abstract translation: 提供了一种可调光滤波器，其具有光耦合到4端口循环器的相应端口的一对可调谐布拉格光栅单元，用于对来自DWDM输入光的所选波长带或光通道进行滤波。 每个光栅单元包括写入或嵌入相应的可调谐光学元件内的布拉格光栅阵列，以提供可调谐的光学滤波器，其在比每个光栅元件的可调范围大的宽光谱范围内起作用。 每个相应光栅元件的光栅阵列的反射波长以预定的间隔间隔开，使得当光栅元件的一对互补光栅对准时，其它互补光栅不对准。 可以调整两个光学元件以在每个对应的光谱范围上选择性地对准每个互补光栅。

公开(公告)号：WO0142748A3

公开(公告)日：2002-01-17

申请号：PCT/US0033067

申请日：2000-12-07

Applicant: CIDRA CORP

Inventor： DAVIS MICHAEL A ,  FOURNIER DAVID R ,  BELLEMORE DAVID G ,  STIELAU WILLIAM M

IPC: H04B10/158 ,  G02B6/34 ,  G01J3/28 ,  G01J9/00

CPC classification number: H04B10/675

Abstract: A fiber Bragg grating peak detection system has a broadband source, 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. 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.

Abstract translation: 光纤布拉格光栅峰值检测系统具有宽带源，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宽带光信号，并进一步响应物理参数。 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为光纤布拉格光栅光信号的光谱带上的每个波长确定相应的局部阈值。 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。

公开(公告)号：WO0138838A2

公开(公告)日：2001-05-31

申请号：PCT/US0031717

申请日：2000-11-20

Applicant: CIDRA CORP

Inventor： DAVIS MICHAEL A ,  FOURNIER DAVID R ,  JONES RICHARD T

IPC: G01K1/20 ,  G01K11/32 ,  G01K

CPC classification number: G01K1/20 ,  G01K11/32

Abstract: 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.

Abstract translation: 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。 玻璃元件锚定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。