公开(公告)号：US20150268095A1

公开(公告)日：2015-09-24

申请号：US14662307

申请日：2015-03-19

Applicant: Servomex Group Limited

Inventor： Richard P. Kovacich ,  Bahram Alizadeh ,  Ian C. Gaskin ,  James D. Hobby ,  Martin Lopez

IPC: G01J3/02 ,  G01N21/39

CPC classification number: G01J3/027 ,  G01J3/0297 ,  G01J3/10 ,  G01J3/433 ,  G01J2003/423 ,  G01N21/274 ,  G01N21/39 ,  G01N2021/399 ,  G01N2201/0612 ,  G01N2201/121 ,  G01N2201/1215

Abstract: A method and system for correcting the effect of intensity fluctuations of the transmitted light in an absorption spectroscopy system used for the detection or measurement of chemical species in a medium, whereby one or more modulation bursts are imposed onto a light beam that passes through the medium. This burst signal may be obtained by modulating the bias current of a tunable diode laser, and the modulation burst signal may be optimally at the second harmonic of the modulation frequency of a wavelength modulated beam to allow usage of the same signal path processing used for the spectroscopic detection of the measurand for a second harmonic detection system. The burst signal can be controlled using a smooth window function to minimise the effects of non-linear perturbations that are inherent in tunable diode laser wavelength modulation spectroscopy systems, of optical interference fringes (etalons) and of the residual light absorption by background chemical species or the measurand at the wavelength coinciding with the modulation burst.

Abstract translation: 一种用于校正用于检测或测量介质中的化学物质的吸收光谱系统中的透射光的强度波动的影响的方法和系统，由此一个或多个调制脉冲串被施加到通过介质的光束 。 可以通过调制可调谐二极管激光器的偏置电流来获得该脉冲串信号，并且调制脉冲串信号可以在波长调制波束的调制频率的二次谐波处最佳地进行，以允许使用与 用于二次谐波检测系统的被测量的光谱检测。 可以使用平滑窗函数来控制突发信号，以最小化可调谐二极管激光波长调制光谱系统固有的非线性扰动，光学干涉条纹（标准具）和背景化学物质的残余光吸收的影响， 在波长上的被测量与调制脉冲串一致。

公开(公告)号：US09109951B2

公开(公告)日：2015-08-18

申请号：US14073711

申请日：2013-11-06

Applicant: SpectraSensors, Inc.

Inventor： Peter Scott ,  Alfred Feitisch ,  Peter Dorn ,  Adam S. Chaimowitz ,  Hsu-Hung Huang ,  Mathias Schrempel ,  Lutz Keller

IPC: G01N21/00 ,  G01J3/42 ,  G01N21/27 ,  G01N21/01

CPC classification number: G01N21/031 ,  G01J3/42 ,  G01J2003/423 ,  G01N21/01 ,  G01N21/0303 ,  G01N21/05 ,  G01N21/27 ,  G01N2021/0307 ,  G01N2201/06113

Abstract: A sample cell can be designed to minimize excess gas volume. Described features can be advantageous in reducing an amount of gas required to flow through the sample cell during spectroscopic measurements, and in reducing a time (e.g. a total volume of gas) required to flush the cell between sampling events. In some examples, contours of the inners surfaces of the sample cell that contact the contained gas can be shaped, dimensioned, etc. such that a maximum clearance distance is provided between the inner surfaces at one or more locations. Systems, methods, and articles, etc. are described.

Abstract translation: 可以设计样品池以最小化过量气体体积。 所描述的特征可以有利于在光谱测量期间减少流过样品池所需的气体量，并且减少在取样事件之间冲洗电池所需的时间（例如总体积的气体）。 在一些示例中，接触所容纳的气体的样品池的内部表面的轮廓可以成形，定尺寸等，使得在一个或多个位置处的内表面之间提供最大间隙距离。 描述系统，方法和物品等。

公开(公告)号：US20150124257A1

公开(公告)日：2015-05-07

申请号：US14073711

申请日：2013-11-06

Applicant: SpectraSensors, Inc.

Inventor： Peter Scott ,  Alfred Feitisch ,  Peter Dorn ,  Adam S. Chaimowitz ,  Hsu-Hung Huang ,  Mathias Schrempel ,  Lutz Keller

IPC: G01J3/42 ,  G01N21/01 ,  G01N21/27

CPC classification number: G01N21/031 ,  G01J3/42 ,  G01J2003/423 ,  G01N21/01 ,  G01N21/0303 ,  G01N21/05 ,  G01N21/27 ,  G01N2021/0307 ,  G01N2201/06113

Abstract: A sample cell can be designed to minimize excess gas volume. Described features can be advantageous in reducing an amount of gas required to flow through the sample cell during spectroscopic measurements, and in reducing a time (e.g. a total volume of gas) required to flush the cell between sampling events. In some examples, contours of the inners surfaces of the sample cell that contact the contained gas can be shaped, dimensioned, etc. such that a maximum clearance distance is provided between the inner surfaces at one or more locations. Systems, methods, and articles, etc. are described.

Abstract translation: 可以设计样品池以最小化过量气体体积。 所描述的特征可以有利于在光谱测量期间减少流过样品池所需的气体量，并且减少在取样事件之间冲洗电池所需的时间（例如总体积的气体）。 在一些示例中，接触所容纳的气体的样品池的内部表面的轮廓可以成形，定尺寸等，使得在一个或多个位置处的内表面之间提供最大间隙距离。 描述系统，方法和物品等。

公开(公告)号：US08971681B2

公开(公告)日：2015-03-03

申请号：US14071983

申请日：2013-11-05

Applicant: Cheetah Omni, LLC

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 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。

公开(公告)号：US20140001364A1

公开(公告)日：2014-01-02

申请号：US13750556

申请日：2013-01-25

Applicant: CHEETAH OMNI, L.L.C.

Inventor： Mohammed N. Islam

IPC: 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: 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 10 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大的光谱的输出光束，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。 输出光束可以具有在10mW或更大的时间平均输出功率和小于约50MW / cm 2的时间平均强度的连续波和1兆赫兹或更高之间的重复率。

公开(公告)号：US08055108B2

公开(公告)日：2011-11-08

申请号：US12366323

申请日：2009-02-05

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。 在一个特定实施例中，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。

公开(公告)号：US20090028193A1

公开(公告)日：2009-01-29

申请号：US11599950

申请日：2006-11-15

Applicant: Mohammed N. Islam

Inventor： Mohammed N. Islam

IPC: H01S3/30

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。

公开(公告)号：US5544186A

公开(公告)日：1996-08-06

申请号：US378017

申请日：1995-01-25

Applicant: Ralf-Roland Sauer ,  Wolfgang Rupp ,  Alexander Hinz

Inventor： Ralf-Roland Sauer ,  Wolfgang Rupp ,  Alexander Hinz

IPC: G01N21/59 ,  G01J3/42 ,  G01N21/39 ,  G01N33/00 ,  H01S3/08 ,  H01S3/10 ,  H01S3/1055 ,  H01S3/223 ,  H01S3/00

CPC classification number: H01S3/1055 ,  G01N21/39 ,  G01N33/0054 ,  G01J2003/423 ,  H01S3/0809 ,  H01S3/2232

Abstract: A gas laser 1 such as a .sup.13 CO.sub.2 -laser emits at two different wavelengths (.lambda..sub.1, .lambda..sub.2) with a sine-shaped adjustment of a resonator mirror or a grating 13 such as a Littrow grating. The gas laser emits radiation at the two desired wavelengths (.lambda..sub.1, .lambda..sub.2) in two mutually adjacent intervals of the resonator length L because of a suitable dimensioning of the grating 13 with respect to grating structure and angle position, the outcoupling factor of the outcoupling mirror 12, the resonator length L and the composition of the gas of the laser. The laser emission is inhibited at the crossover between the two intervals and the sine-shaped modulation (for example with a piezo element) of the resonator length L is essentially symmetrical about this crossover. The invention is also directed to an arrangement for detecting a substance such as NH.sub.3 in a flue gas. This arrangement includes a two wavelengths laser light source 1, a modulation unit 14 and a reference detection unit D1; a transmission optic 2; a measuring path 3 which contains the substance to be detected; a receiving optic 4 and a measuring detector D2. An evaluation apparatus 5 is also provided which determines the ratio of the light absorption in the measuring path 3 at the two wavelengths (.lambda..sub.1, .lambda..sub.2) and determines therefrom the concentration of the substance to be detected in the measuring path 3.

Abstract translation: 诸如13CO 2激光器的气体激光器1以谐振镜或诸如Littrow光栅的光栅13的正弦调整在两个不同波长（λ1，λ2）处发射。 由于光栅13相对于光栅结构和角度位置的合适的尺寸，气体激光器在谐振器长度L的两个相互相邻的间隔中以两个期望的波长（λ1，λ2）发射辐射， 外耦合镜12，谐振器长度L和激光器的气体的组成。 激光发射在两个间隔之间的交叉处被抑制，并且谐振器长度L的正弦调制（例如使用压电元件）基本上对称于该交叉。 本发明还涉及一种在烟道气中检测诸如NH 3的物质的装置。 这种布置包括两个波长激光光源1，调制单元14和基准检测单元D1; 传输光学器件2; 包含待检测物质的测量路径3; 接收光学器件4和测量检测器D2。 还提供了一种评估装置5，其确定测量路径3中两个波长（λ1，λ2）处的光吸收率，并由此确定测量路径3中待检测物质的浓度。

公开(公告)号：US12130136B2

公开(公告)日：2024-10-29

申请号：US17707479

申请日：2022-03-29

Applicant: Thorlabs, Inc.

Inventor： Oliver Heckl ,  Jakob Fellinger

IPC: G01S17/34 ,  G01B9/02001 ,  G01J3/433 ,  G01J3/45 ,  G01J3/457 ,  G01S7/48 ,  G01S7/497 ,  G01S17/894 ,  G01J3/28 ,  G01J3/42

CPC classification number: G01B9/02008 ,  G01J3/433 ,  G01J3/45 ,  G01J3/457 ,  G01S7/4808 ,  G01S7/497 ,  G01S17/34 ,  G01S17/894 ,  G01J2003/2879 ,  G01J2003/423 ,  G01J2003/4332

Abstract: A device that uses two intensity modulated frequency combs to measure distances with high precision and high data acquisition rate without any moving parts and without length ambiguity that is inherent conventional ranging based on two frequency combs. A modulation signal having a repetition rate identical to the repetition rate difference between the two combs is used to do a direct time-of-flight length measurement, hence avoiding the given length ambiguity while harvesting the increased precision of the dual-comb approach.

公开(公告)号：US20240319009A1

公开(公告)日：2024-09-26

申请号：US18232438

申请日：2023-08-10

Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

Inventor： Hong-Seok SEO ,  Dong Hoon SONG ,  CHUL HUH

IPC: G01J3/28 ,  G01J3/02 ,  G01J3/433

CPC classification number: G01J3/2823 ,  G01J3/0208 ,  G01J3/0218 ,  G01J3/0224 ,  G01J3/4338 ,  G01J2003/2826 ,  G01J2003/423 ,  G01J2003/4334

Abstract: Disclosed is a hyperspectral imaging device, which includes a code generator that generates a code signal including first code information and second code information which are orthogonal to each other, a light transmitter that receives the code signal and generates output light including first modulated light modulated based on the first code information and second modulated light modulated based on the second code information, and a receiver that receives reflected light from which the output light is reflected from a sample and obtains a hyperspectral image based on the reflected light and the code signal, and the first modulated light has a first wavelength band and the second modulated light has a second wavelength band different from the first wavelength band.