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    Method and apparatus for external cavity laser absorption spectroscopy
    93.
    发明授权
    Method and apparatus for external cavity laser absorption spectroscopy 有权
    外腔激光吸收光谱法的方法和装置

    公开(公告)号：US09347878B2

    公开(公告)日：2016-05-24

    申请号：US14422924

    申请日：2013-08-09

    Applicant: THE SCIENCE AND TECHNOLOGY FACILITIES COUNCIL

    Inventor： Damien Weidmann ,  Richard Brownsword

    IPC: G01N21/00 ,  G01N21/39 ,  G01J3/42 ,  G01N21/3504

    CPC classification number: G01N21/39 ,  G01J3/42 ,  G01J2003/423 ,  G01N21/3504 ,  G01N2021/396 ,  G01N2201/022 ,  G01N2201/06113

    Abstract: Method and apparatus for external cavity laser absorption spectroscopy There is disclosed an apparatus, and corresponding methods, for determining one or more characteristics of a sample in an absorption cell using laser absorption spectroscopy. For example, the characteristic may be concentration of a species in the sample. The apparatus comprises an external cavity semiconductor laser comprising a semiconductor gain medium within an optical resonator. The absorption cell is located within the optical resonator of the external cavity semiconductor laser so as to be optically coupled with the gain medium. A controller is arranged to provide a varied injection current to the semiconductor gain medium. A photodetector is arranged to detect laser light output by the external cavity semiconductor laser. An analyzer is arranged to determine one or more characteristics of the sample from behavior of the detected laser light output as a function of the varied injection current.

    Abstract translation: 用于外腔激光吸收光谱的方法和装置公开了一种用于使用激光吸收光谱法确定吸收单元中的样品的一个或多个特性的装置和相应的方法。 例如，特征可以是样品中物种的浓度。 该装置包括在光谐振器内包括半导体增益介质的外腔半导体激光器。 吸收单元位于外腔半导体激光器的光学谐振器内，以便与增益介质光耦合。 控制器被布置成向半导体增益介质提供变化的注入电流。 光检测器被布置成检测由外腔半导体激光器输出的激光。 分析器被布置成根据检测到的激光输出的行为来确定样品的一个或多个特性作为改变的注入电流的函数。

    BROADBAND OR MID-INFRARED FIBER LIGHT SOURCES
    94.
    发明申请
    BROADBAND OR MID-INFRARED FIBER LIGHT SOURCES 审中-公开
    宽带或中红外光纤光源

    公开(公告)号：US20150247756A1

    公开(公告)日：2015-09-03

    申请号：US14715960

    申请日：2015-05-19

    Applicant: OMNI MEDSCI, INC.

    Inventor： Mohammed N. ISLAM

    IPC: G01J3/42 ,  G01J3/02 ,  G01J3/10

    CPC classification number: G01J3/108 ,  G01B9/02091 ,  G01J3/0218 ,  G01J3/0245 ,  G01J3/42 ,  G01J2003/102 ,  G01J2003/423 ,  G02B6/29349 ,  G02F1/365 ,  G02F2001/3528 ,  G02F2202/32 ,  H01S3/06725 ,  H01S3/06754 ,  H01S3/094007 ,  H01S3/094069 ,  H01S3/094076 ,  H01S3/1024 ,  H01S3/302 ,  H01S5/0064 ,  H01S5/0085 ,  H01S5/0092 ,  H01S5/1092 ,  H01S5/146 ,  H01S5/4012 ,  H01S2301/085

    Abstract: A diagnostic system includes a semiconductor light emitter(s) configured to generate an input beam having a wavelength shorter than about 2.5 microns. An optical amplifier(s) configured to receive a portion of the input beam communicates an intermediate beam to an output end of the optical amplifier. An optical fiber(s) configured to receive a portion of the intermediate beam forms an output beam with an associated wavelength. A subsystem having lenses or mirrors receives a received portion of the output beam and delivers a delivered portion of the output beam to a sample. The delivered portion has a temporal duration greater than approximately 30 picoseconds and a repetition rate between continuous wave and Megahertz or higher. A time averaged intensity of the delivered portion is less than approximately 50 MW/cm2. A light detection system collects and analyzes a fraction of the delivered portion that reflects or transmits from the sample.

    Abstract translation: 诊断系统包括配置成产生具有短于约2.5微米的波长的输入束的半导体光发射器。 被配置为接收输入光束的一部分的光放大器将中间光束传送到光放大器的输出端。 被配置为接收中间波束的一部分的光纤形成具有相关波长的输出波束。 具有透镜或反射镜的子系统接收输出光束的接收部分并将输出光束的传送部分传送到样品。 传送部分具有大于约30皮秒的时间持续时间和连续波与兆赫兹或更高之间的重复频率。 输送部分的时间平均强度小于约50MW / cm 2。 光检测系统收集和分析从样品反射或透射的传送部分的一部分。

    HIGH REPETITION RATE THERMOMETRY SYSTEM AND METHOD
    95.
    发明申请
    HIGH REPETITION RATE THERMOMETRY SYSTEM AND METHOD 审中-公开
    高重复率热电偶系统和方法

    公开(公告)号：US20150131700A1

    公开(公告)日：2015-05-14

    申请号：US14537762

    申请日：2014-11-10

    Applicant: Robin Chrystie ,  Aamir Farooq

    Inventor： Robin Chrystie ,  Aamir Farooq

    IPC: G01K11/00 ,  G01J5/00

    CPC classification number: G01K11/00 ,  G01J3/10 ,  G01J3/42 ,  G01J5/0014 ,  G01J2003/423

    Abstract: A system and method for rapid thermometry using intrapulse spectroscopy can include a laser for propagating pulses of electromagnetic radiation to a region. Each of the pulses can be chirped. The pulses from the region can be detected. An intrapulse absorbance spectrum can be determined from the pulses. An instantaneous temperature of the region based on the intrapulse absorbance spectrum can be determined.

    Abstract translation: 使用脉冲内波谱的快速测温系统和方法可以包括用于将电磁辐射的脉冲传播到一个区域的激光器。 每个脉冲可以被啁啾。 可以检测来自该区域的脉冲。 可以从脉冲确定脉冲内吸收光谱。 可以确定基于脉冲内吸收光谱的区域的瞬时温度。

    Method of analyzing and controlling a combustion process in a gas turbine and apparatus for performing the method
    96.
    发明授权
    Method of analyzing and controlling a combustion process in a gas turbine and apparatus for performing the method 有权
    分析和控制燃气轮机中的燃烧过程的方法和用于执行该方法的装置

    公开(公告)号：US08825214B2

    公开(公告)日：2014-09-02

    申请号：US13300110

    申请日：2011-11-18

    Applicant: Ken Yves Haffner

    Inventor： Ken Yves Haffner

    IPC: G01B21/02 ,  G01J5/00 ,  G01N21/27 ,  G01J3/42 ,  G01N21/35 ,  G01N21/39 ,  G01J3/28 ,  G01J5/08

    CPC classification number: G01J5/0014 ,  G01J3/42 ,  G01J5/0821 ,  G01J2003/2833 ,  G01J2003/2873 ,  G01J2003/423 ,  G01N21/274 ,  G01N21/3504 ,  G01N21/39

    Abstract: A method is provided for the measurement of parameters of a gas present in a gas turbine combustion chamber. The method includes tuning a laser to a range containing the absorption lines of species to be analyzed in the gas, and directing the laser light through the combustion chamber and detecting laser light reflected off boundary walls of the combustion chamber. In order to analyze the absorption spectrum measured at high temperatures and pressures, a signature recognition algorithm is applied to the spectrum. The measured absorption spectrum is cross-correlated with a calibration absorption model spectrum for the absorption lines at several temperatures, pressures, and concentrations generated prior to the measurement. Values for pressure, temperature, and concentrations of selected species in the gas are determined simultaneously allowing direct control of the combustion chamber process. An apparatus for carrying out the method is also provided.

    Abstract translation: 提供了一种用于测量燃气轮机燃烧室中存在的气体的参数的方法。 该方法包括将激光调谐到包含待分析物质的吸收线的范围内，并将激光引导通过燃烧室并检测从燃烧室的边界壁反射的激光。 为了分析在高温和高压下测得的吸收光谱，应用了一个签名识别算法。 测量的吸收光谱与在测量之前产生的几个温度，压力和浓度下的吸收谱线的校准吸收模型光谱互相关。 同时确定气体中选定物种的压力，温度和浓度值，直接控制燃烧室过程。 还提供了一种用于执行该方法的装置。

    BROADBAND OR MID-INFRARED FIBER LIGHT SOURCES
    97.
    发明申请
    BROADBAND OR MID-INFRARED FIBER LIGHT SOURCES 有权
    宽带或中红外光纤光源

    公开(公告)号：US20140233035A1

    公开(公告)日：2014-08-21

    申请号：US14071983

    申请日：2013-11-05

    Applicant: Cheetah Omni, LLC

    Inventor： Mohammed N. ISLAM

    IPC: G01J3/10 ,  G01J3/02 ,  G01B9/02

    CPC classification number: G01J3/108 ,  G01B9/02091 ,  G01J3/0218 ,  G01J3/0245 ,  G01J3/42 ,  G01J2003/102 ,  G01J2003/423 ,  G02B6/29349 ,  G02F1/365 ,  G02F2001/3528 ,  G02F2202/32 ,  H01S3/06725 ,  H01S3/06754 ,  H01S3/094007 ,  H01S3/094069 ,  H01S3/094076 ,  H01S3/1024 ,  H01S3/302 ,  H01S5/0064 ,  H01S5/0085 ,  H01S5/0092 ,  H01S5/1092 ,  H01S5/146 ,  H01S5/4012 ,  H01S2301/085

    Abstract: An optical system for use in an imaging procedure includes one or more semiconductor diodes configured to generate an input signal beam with a wavelength shorter than 2.5 microns that is amplified and communicated through optical fiber(s) to a nonlinear element configured to broaden the spectral width to at least 50 nm through a nonlinear effect. A subsystem includes lenses or mirrors to deliver an output beam having a broadened spectrum to an Optical Coherence Tomography apparatus with a sample and reference arm to perform imaging for characterizing the sample. The delivered output beam has a temporal duration greater than about 30 picoseconds, a repetition rate between continuous wave and Megahertz or higher, and a time averaged intensity of less than approximately 50 MW/cm2. The output beam has a time averaged output power of 20 mW or more.

    Abstract translation: 用于成像过程的光学系统包括一个或多个半导体二极管，被配置为产生波长短于2.5微米的输入信号光束，该输入信号光束被放大并通过光纤传送到被配置为扩大光谱宽度的非线性元件 通过非线性效应至少50nm。 子系统包括透镜或反射镜，以将具有加宽光谱的输出光束传送到具有样品和参考臂的光学相干断层摄影装置，以执行用于表征样品的成像。 所输出的输出光束具有大于约30皮秒的时间持续时间，连续波和兆赫兹或更高之间的重复频率以及小于约50MW / cm 2的时间平均强度。 输出光束的时间平均输出功率为20mW以上。

    Broadband or mid-infrared fiber light sources
    98.
    发明授权
    Broadband or mid-infrared fiber light sources 有权
    宽带或中红外光纤光源

    公开(公告)号：US08670642B2

    公开(公告)日：2014-03-11

    申请号：US13750556

    申请日：2013-01-25

    Applicant: Cheetah Omni, L.L.C.

    Inventor： Mohammed N. Islam

    IPC: G02B6/00

    CPC classification number: G01J3/108 ,  G01B9/02091 ,  G01J3/0218 ,  G01J3/0245 ,  G01J3/42 ,  G01J2003/102 ,  G01J2003/423 ,  G02B6/29349 ,  G02F1/365 ,  G02F2001/3528 ,  G02F2202/32 ,  H01S3/06725 ,  H01S3/06754 ,  H01S3/094007 ,  H01S3/094069 ,  H01S3/094076 ,  H01S3/1024 ,  H01S3/302 ,  H01S5/0064 ,  H01S5/0085 ,  H01S5/0092 ,  H01S5/1092 ,  H01S5/146 ,  H01S5/4012 ,  H01S2301/085

    Abstract: An optical system for use in a spectroscopy procedure includes one or more semiconductor diodes configured to generate an input signal beam with a wavelength shorter than 2.5 microns that is amplified and communicated through optical fiber(s) to a nonlinear element configured to broaden the spectral width to at least 50 nm through a nonlinear effect. A subsystem includes lenses or mirrors to deliver an output beam having a broadened spectrum selected to obtain a desired penetration depth and substantially minimize water absorption with a temporal duration greater than about 30 picoseconds to a sample to perform spectroscopy to characterize the sample. The output beam may have a repetition rate between continuous wave and one Megahertz or higher with a time averaged output power of 20 mW or more and a time averaged intensity of less than approximately 50 MW/cm2.

    Abstract translation: 用于光谱法的光学系统包括一个或多个半导体二极管，其被配置为产生波长短于2.5微米的输入信号光束，该输入信号光束被放大并通过光纤传送到被配置为扩大光谱宽度的非线性元件 通过非线性效应至少50nm。 子系统包括透镜或反射镜，以输送具有被选择为扩展的光谱的输出光束，以获得期望的穿透深度并且基本上最小化对样品的时间持续时间大于约30皮秒的吸水率以进行光谱以表征样品。 输出光束可以具有连续波和一兆赫兹或更高的重复率，时间平均输出功率为20mW或更大，而时间平均强度小于约50MW / cm 2。

    Laser diode structure with integrated temperature-controlled beam shaping element and method for gas detection by means of a laser diode structure
    99.
    发明授权
    Laser diode structure with integrated temperature-controlled beam shaping element and method for gas detection by means of a laser diode structure 有权
    具有集成温度控制光束成形元件的激光二极管结构和通过激光二极管结构进行气体检测的方法

    公开(公告)号：US08594143B2

    公开(公告)日：2013-11-26

    申请号：US12628578

    申请日：2009-12-01

    Applicant: Bert Willing ,  Rui Protasio ,  Mathieu Gaillard

    Inventor： Bert Willing ,  Rui Protasio ,  Mathieu Gaillard

    IPC: H01S3/04

    CPC classification number: G01N21/3504 ,  G01J3/10 ,  G01J3/42 ,  G01J2003/423 ,  G01N21/39 ,  G01N2021/399 ,  G01N2201/0612 ,  G01N2201/0633 ,  H01S5/02212 ,  H01S5/02296 ,  H01S5/02415 ,  H01S5/02438 ,  H01S5/0267 ,  H01S5/18388

    Abstract: The invention relates to a laser diode structure, specifically for use in gas detection, with a hermetically sealed housing with electrical connections having a bottom and a window. A laser diode chip and a temperature control system for the laser diode chip are provided in the housing. A thermo element in the form of a Peltier element forms the temperature control system, and is connected via a lower flat surface to the bottom of the housing and via an upper flat surface to the laser diode chip, with a temperature-controlled beam shaping element as collimator provided between the laser diode chip and the window of the housing that acts on a laser beam emerging from a laser aperture of the laser diode chip before it passes through the window. The beam shaping element is in contact with the laser diode chip and is preferably connected via a boundary surface to the laser aperture with surface-to-surface contact or adhesively, or is made in one piece together with the laser aperture.

    Abstract translation: 本发明涉及一种专门用于气体检测的激光二极管结构，其具有带有底部和窗口的电连接的气密密封外壳。 激光二极管芯片和用于激光二极管芯片的温度控制系统设置在壳体中。 形式为Peltier元件的热元件形成温度控制系统，并通过下平面连接到壳体的底部，并通过上平面连接到激光二极管芯片，具有温度控制的光束成形元件 作为在激光二极管芯片和壳体的窗口之间提供的准直器，其作用于在激光二极管芯片通过窗口之前从激光二极管芯片的激光孔径出射的激光束。 光束成形元件与激光二极管芯片接触，并且优选地通过边界面与表面接触或粘合地连接到激光器孔，或者与激光孔一起制成一个部件。

    Broadband or mid-infrared fiber light sources
    100.
    发明授权
    Broadband or mid-infrared fiber light sources 有权
    宽带或中红外光纤光源

    公开(公告)号：US07519253B2

    公开(公告)日：2009-04-14

    申请号：US11599950

    申请日：2006-11-15

    Applicant: Mohammed N. Islam

    Inventor： Mohammed N. Islam

    IPC: G02B6/00

    CPC classification number: G01J3/108 ,  G01B9/02091 ,  G01J3/0218 ,  G01J3/0245 ,  G01J3/42 ,  G01J2003/102 ,  G01J2003/423 ,  G02B6/29349 ,  G02F1/365 ,  G02F2001/3528 ,  G02F2202/32 ,  H01S3/06725 ,  H01S3/06754 ,  H01S3/094007 ,  H01S3/094069 ,  H01S3/094076 ,  H01S3/1024 ,  H01S3/302 ,  H01S5/0064 ,  H01S5/0085 ,  H01S5/0092 ,  H01S5/1092 ,  H01S5/146 ,  H01S5/4012 ,  H01S2301/085

    Abstract: A broadband light source includes one or more laser diodes that are capable of generating a pump signal having a wavelength shorter than 2.5 microns, a pulse width of at least 100 picoseconds and a pump optical spectral width. The light source also includes one or more optical amplifiers that are coupled to the pump signal and are capable of amplifying the pump signal to a peak power of at least 500 W. The light source further includes a first fiber that is coupled to the one or more optical amplifiers. The first fiber including an anomalous group-velocity dispersion regime and a modulational instability mechanism that operates to modulate the pump signal. In one particular embodiment, the pump signal wavelength resides in the anomalous group-velocity dispersion regime of the first fiber and where different intensities in the pump signal can cause relative motion between different parts of the modulated pump signal produced through modulational instability in the first fiber. The light source also including a nonlinear element that is coupled to the first fiber that is capable of broadening the pump optical spectral width to at least 100 nm through a nonlinear effect in the nonlinear element.

    Abstract translation: 宽带光源包括能够产生波长短于2.5微米的泵浦信号，至少100皮秒的脉冲宽度和泵浦光谱宽度的一个或多个激光二极管。 光源还包括耦合到泵浦信号并且能够将泵浦信号放大到至少500W的峰值功率的一个或多个光放大器。光源还包括第一光纤，其耦合到一个或 更多的光放大器。 第一光纤包括异常组 - 速度色散方案和用于调制泵浦信号的调制不稳定机制。 在一个具体实施例中，泵浦信号波长驻留在第一光纤的异常群 - 速度色散方案中，并且其中泵浦信号中的不同强度可引起通过第一光纤中的调制不稳定性产生的调制泵浦信号的不同部分之间的相对运动 。 光源还包括耦合到第一光纤的非线性元件，其能够通过非线性元件中的非线性效应将泵浦光谱宽度扩展至至少100nm。

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