公开(公告)号：US4489239A

公开(公告)日：1984-12-18

申请号：US423016

申请日：1982-09-24

申请人： William B. Grant ,  E. David Hinkley, Jr.

发明人： William B. Grant ,  E. David Hinkley, Jr.

IPC分类号： G01J1/44 ,  G01N21/31 ,  G01N21/39 ,  G01J1/00

CPC分类号： G01N21/39 ,  G01J2001/4242 ,  G01N2021/395 ,  G01N21/314

摘要： A portable laser system for remote detection of methane gas leaks and concentrations is disclosed. The system transmitter includes first and second lasers, tuned respectively to a wavelength coincident with a strong absorption line of methane and a reference wavelength which is weakly absorbed by methane gas. The lasers are aimed at a topographical target along a system axis and the beams successively interrupted by a chopper wheel.The system receiver includes a spherical mirror for collecting the reflected laser radiation and focusing the collected radiation through a narrowband optical filter onto an optial detector. The filter is tuned to the wavelength of the two lasers, and rejects background noise to substantially improve the signal-to-noise ratio of the detector. The output of the optical detector is processed by a lock-in detector synchronized to the chopper, and which measures the difference between the first wavelength signal and the reference wavelength signal.

摘要翻译： 公开了用于远程检测甲烷气体泄漏和浓度的便携式激光系统。 系统发射器包括第一和第二激光器，分别调谐到与甲烷的强吸收谱线相一致的波长和弱甲烷气体吸收的参考波长。 激光器沿着系统轴线瞄准地形目标，并且由连续的切割轮中断的光束。 系统接收器包括用于收集反射的激光辐射并将收集的辐射通过窄带滤光器聚焦到光学检测器上的球面镜。 滤波器被调谐到两个激光器的波长，并且抑制背景噪声以显着地提高检测器的信噪比。 光检测器的输出由与斩波器同步的锁定检测器处理，并且测量第一波长信号和参考波长信号之间的差。

公开(公告)号：US07508520B1

公开(公告)日：2009-03-24

申请号：US11521265

申请日：2006-09-14

申请人： Raymond Todd Lines ,  Norman A. Lopez ,  Joseph L. Lippert ,  Darryl Guy Murdock ,  Dawn Lenz ,  Michael Stoogenke ,  Matthew C. Severski ,  Hooshmand M. Kalayeh

发明人： Raymond Todd Lines ,  Norman A. Lopez ,  Joseph L. Lippert ,  Darryl Guy Murdock ,  Dawn Lenz ,  Michael Stoogenke ,  Matthew C. Severski ,  Hooshmand M. Kalayeh

IPC分类号： G01N21/00

CPC分类号： G01N21/3504 ,  G01N21/39 ,  G01N2021/1797 ,  G01N2021/3513 ,  G01N2021/393 ,  G01N2021/394 ,  G01N2021/395

摘要： Methods and systems for obtaining a target fluid map of a survey area using a differential absorption LIDAR (DIAL) system are provided. Pulse bursts are transmitted toward the survey area, where each pulse burst includes an off-line pulse and at least one on-line pulse. Pulse bursts, each being associated with a measurement point, are received from the survey area. A concentration path length (CPL) corresponding to a respective on-line pulse, a spatial location associated with the CPL, and an error associated with the CPL are determined for each measurement point. The CPL for each measurement point is arranged within the survey area to form the target fluid map.

摘要翻译： 提供了使用差分吸收LIDAR（DIAL）系统获得测量区域的目标流体图的方法和系统。 脉冲脉冲串被发送到测量区域，其中每个脉冲脉冲串包括离线脉冲和至少一个在线脉冲。 从测量区域接收到与测量点相关联的脉冲串。 对于每个测量点确定对应于相应在线脉冲​​的浓度路径长度（CPL），与CPL相关联的空间位置以及与CPL相关联的错误。 每个测量点的CPL被安排在测量区域内以形成目标流体图。

公开(公告)号：US07349094B2

公开(公告)日：2008-03-25

申请号：US10538042

申请日：2003-12-03

申请人： Michael Harris ,  David J Bryce ,  Guy N Pearson ,  David V Willetts

发明人： Michael Harris ,  David J Bryce ,  Guy N Pearson ,  David V Willetts

IPC分类号： G01N21/00

CPC分类号： G01N21/39 ,  G01J3/42 ,  G01N21/3504 ,  G01N2021/1793 ,  G01N2021/3513 ,  G01N2021/394 ,  G01N2021/395 ,  G01N2021/399

摘要： A coherent laser radar (lidar) device is described. The device has a transmitter portion that comprises a single wavelength laser source, a conversion means (such as an electro-optic modulator) for producing a combined light beam that comprises at least two component light beams of discrete wavelength from the output of said single wavelength laser source, and transmit optics to direct the combined light beam to a remote target. Each component light beam of the combined light beam traverses the same optical path from the single wavelength laser source to the transmit optics. The device is used to make differential absorption measurements.

摘要翻译： 描述了相干激光雷达（激光雷达）装置。 该装置具有包括单个波长激光源的发射器​​部分，用于产生组合光束的转换装置（例如电光调制器），该组合光束包括从所述单个波长的输出的离散波长的至少两个分量光束 激光源和发射光学器件以将组合的光束引导到远程目标。 组合光束的每个分量光束穿过从单个波长激光源到发射光学器件的相同光路。 该装置用于进行差分吸收测量。

公开(公告)号：US5451787A

公开(公告)日：1995-09-19

申请号：US321228

申请日：1994-10-11

申请人： Lyle H. Taylor

发明人： Lyle H. Taylor

IPC分类号： G01N21/31 ,  G01N21/39 ,  G01N21/17 ,  G01N21/35

CPC分类号： G01N21/39 ,  G01N2021/395 ,  G01N2021/398 ,  G01N21/314 ,  G01N21/3504

摘要： Gases such as pollutants are discerned in a sample, preferably using a laser to emit an infrared light beam along a sight path for illuminating the gases. The beam is directed along the sight path and collects light from the gases. An optical tunable filter selects a particular optical wavelength or band, and the filtered wavelength is focused on a detector coupled to an analyzer. The analyzer can include a processor that can pulse the laser or coordinate collection of data from sample gases and from a reference cell containing known gases, e.g., using an optical chopper wheel. The processor analyzes the light levels as a function of wavelength to discriminate for the presence of selected gases by determining a characteristic pattern of light absorption and light emission by the gases. The tunable filter has an acousto-optical crystal of Tl.sub.3 AsSe.sub.3, in which an RF acoustic wave is generated for varying diffraction of light by the filter, thereby selecting a wavelength. A nonlinear output crystal can in inserted controllably to selectively generate harmonics for increasing wavelength coverage, and can also be Tl.sub.3 AsSe.sub.3. A broad band infrared illumination source can be used. When the infrared excitation beam is off, the filter acts on infrared emissions of the gases. Sensitivity to narrow emission lines is increased by modulating the RF drive to the tunable filter, producing derivatives of the spectra.

摘要翻译： 在样品中识别出污染物等气体，优选使用激光器沿着视线路径发射红外光束以照射气体。 光束沿着视线路径引导并收集来自气体的光。 光学可调谐滤波器选择特定的光学波长或频带，并且滤波的波长聚焦在耦合到分析器的检测器上。 分析器可以包括处理器，其可以脉冲激光或协调从样品气体和来自包含已知气体的参考单元的采集，例如使用光学切碎机轮。 处理器通过确定气体的光吸收和发光的特征图案来分析作为波长的函数的光水平，以区分选定气体的存在。 可调滤波器具有Tl3AsSe3的声光晶体，其中产生用于通过滤波器改变光的衍射的RF声波，从而选择波长。 非线性输出晶体可以可控地插入，以选择性地产生用于增加波长覆盖的谐波，并且还可以是Tl3AsSe3。 可以使用宽带红外照明源。 当红外激发光束关闭时，滤光器作用于气体的红外发射。 通过将RF驱动调制到可调谐滤波器来增加对窄发射线的灵敏度，产生光谱的衍生物。

公开(公告)号：US08269971B1

公开(公告)日：2012-09-18

申请号：US12617210

申请日：2009-11-12

申请人： Waverly Dickson Marsh ,  Steven Vincent Stearns

发明人： Waverly Dickson Marsh ,  Steven Vincent Stearns

IPC分类号： G01N21/00

CPC分类号： G01N21/3504 ,  G01N2021/1793 ,  G01N2021/394 ,  G01N2021/395

摘要： A remote sensing system includes a transmitter for generating multiple beams of light; a combiner for combining the multiple beams of light and directing the combined multiple beams toward a target of multiple gases; and a receiver for receiving the combined multiple beams of light from the target. The first and second transmitted beams of light include, respectively, first and second sets of multiple distinct wavelengths that are simultaneously transmitted toward the target. The receiver receives the multiple distinct wavelengths, and simultaneously detects an intensity of each received wavelength. The first set of multiple distinct wavelengths is selected based on absorption characteristics of a first species of gas, and the second set of multiple distinct wavelengths is selected based on absorption characteristics of a second species of gas. The transmitter includes first and second mode-locked based lasers for generating, respectively, the first and second sets of distinct multiple wavelengths. The receiver includes first and second pixel arrays for detecting, respectively, the first and second sets of distinct multiple wavelengths.

摘要翻译： 遥感系统包括用于产生多个光束的发射器; 组合器，用于组合多个光束并将组合的多个光束导向多个气体的目标; 以及用于接收来自目标的组合的多个光束的接收器。 第一和第二透射光束分别包括朝向目标同时传输的第一组和第二组不同波长。 接收器接收多个不同的波长，同时检测每个接收波长的强度。 基于第一种气体的吸收特性来选择第一组多个不同波长，并且基于第二种气体的吸收特性来选择第二组多个不同波长。 发射机包括用于分别产生第一组和第二组不同多个波长的第一和第二基于锁模的激光器。 接收机包括用于分别检测第一组和第二组不同多个波长的第一和第二像素阵列。

公开(公告)号：US07312452B2

公开(公告)日：2007-12-25

申请号：US11256560

申请日：2005-10-21

申请人： Hans H. Klingenberg ,  Andreas Fix ,  Peter Mahnke ,  Christian Lemmerz

发明人： Hans H. Klingenberg ,  Andreas Fix ,  Peter Mahnke ,  Christian Lemmerz

IPC分类号： G01N21/00

CPC分类号： G01N21/3504 ,  G01J3/457 ,  G01N21/39 ,  G01N2021/1793 ,  G01N2021/3513 ,  G01N2021/392 ,  G01N2021/395 ,  G01N2021/399

摘要： The invention relates to a mobile remote detection device for accumulations of methane, comprising an emitter device having a light source in order to generate light, the wavelength of said light source being tuned with the spectral signature of methane, whereby the light can be directed onto a measuring field. The detection device also comprises a detector device for detecting backscattered light, and an evaluation device. The aim of the invention is to improve the remote detection device in such a manner that it has a high degree of measuring sensitivity with a compact and stable structure. According to the invention, the light source generates light with a wavelength at which methane is absorbed, wherein the wavelength lies between 3200 nm and 3300 nm, and the light source has an optical parametric oscillator with injection seeding, the oscillator being associated with a pump laser.

摘要翻译： 本发明涉及一种用于积聚甲烷的移动式远程检测装置，其包括具有光源的发射器​​装置以产生光，所述光源的波长利用甲烷的光谱特征进行调谐，从而可将光引导到 一个测量领域。 检测装置还包括用于检测反向散射光的检测器装置和评估装置。 本发明的目的是通过紧凑且稳定的结构，以高度的测量灵敏度的方式改进远程检测装置。 根据本发明，光源产生具有吸收甲烷的波长的光，其中波长在3200nm和3300nm之间，并且光源具有带有注入接种的光参量振荡器，该振荡器与泵相关联 激光。

公开(公告)号：US20060114447A1

公开(公告)日：2006-06-01

申请号：US10538042

申请日：2003-12-03

申请人： Michael Harris ,  David Bryce ,  Guy Pearson ,  David Willetts

发明人： Michael Harris ,  David Bryce ,  Guy Pearson ,  David Willetts

IPC分类号： G01C3/08

CPC分类号： G01N21/39 ,  G01J3/42 ,  G01N21/3504 ,  G01N2021/1793 ,  G01N2021/3513 ,  G01N2021/394 ,  G01N2021/395 ,  G01N2021/399

摘要： A coherent laser radar (lidar) device is described. The device has a transmitter portion that comprises a single wavelength laser source, a conversion means (such as an electro-optic modulator) for producing a combined light beam that comprises at least two component light beams of discrete wavelength from the output of said single wavelength laser source, and transmit optics to direct the combined light beam to a remote target. Each component light beam of the combined light beam traverses the same optical path from the single wavelength laser source to the transmit optics. The device is used to make differential absorption measurements.

摘要翻译： 描述了相干激光雷达（激光雷达）装置。 该装置具有包括单个波长激光源的发射器​​部分，用于产生组合光束的转换装置（例如电光调制器），该组合光束包括从所述单个波长的输出到离散波长的至少两个分量光束 激光源和发射光学器件以将组合的光束引导到远程目标。 组合光束的每个分量光束穿过从单个波长激光源到发射光学器件的相同光路。 该装置用于进行差分吸收测量。

公开(公告)号：US20060114464A1

公开(公告)日：2006-06-01

申请号：US11256560

申请日：2005-10-21

申请人： Hans Klingenberg ,  Andreas Fix ,  Peter Mahnke ,  Christian Lemmerz

发明人： Hans Klingenberg ,  Andreas Fix ,  Peter Mahnke ,  Christian Lemmerz

IPC分类号： G01J1/42 ,  G01N21/00

CPC分类号： G01N21/3504 ,  G01J3/457 ,  G01N21/39 ,  G01N2021/1793 ,  G01N2021/3513 ,  G01N2021/392 ,  G01N2021/395 ,  G01N2021/399

摘要： The invention relates to a mobile remote detection device for accumulations of methane, comprising an emitter device having a light source in order to generate light, the wavelength of said light source being tuned with the spectral signature of methane, whereby the light can be directed onto a measuring field. The detection device also comprises a detector device for detecting backscattered light, and an evaluation device. The aim of the invention is to improve the remote detection device in such a manner that it has a high degree of measuring sensitivity with a compact and stable structure. According to the invention, the light source generates light with a wavelength at which methane is absorbed, wherein the wavelength lies between 3200 nm and 3300 nm, and the light source has an optical parametric oscillator with injection seeding, the oscillator being associated with a pump laser.

摘要翻译： 本发明涉及一种用于积聚甲烷的移动式远程检测装置，其包括具有光源的发射器​​装置以产生光，所述光源的波长利用甲烷的光谱特征进行调谐，从而可将光引导到 一个测量领域。 检测装置还包括用于检测反向散射光的检测器装置和评估装置。 本发明的目的是通过紧凑且稳定的结构，以高度的测量灵敏度的方式改进远程检测装置。 根据本发明，光源产生具有吸收甲烷的波长的光，其中波长在3200nm和3300nm之间，并且光源具有带有注入接种的光参量振荡器，该振荡器与泵相关联 激光。

公开(公告)号：US5373160A

公开(公告)日：1994-12-13

申请号：US58191

申请日：1993-05-04

申请人： Lyle H. Taylor

发明人： Lyle H. Taylor

IPC分类号： G01N21/31 ,  G01N21/39 ,  G01N21/17 ,  G01N21/35

CPC分类号： G01N21/39 ,  G01N2021/395 ,  G01N2021/398 ,  G01N21/314

摘要： Gases such as pollutants are discerned in the open air, preferably using a laser to emit an infrared light beam along a sight path for illuminating the gases. A telescope is directed along the sight path and collects light from the gases, the combination of the laser and telescope permitting redirection of the sight path to any target, such as fugitive emissions of a stack. An optical tunable filter is coupled to the telescope for selecting a particular optical wavelength or band, and focusing the filtered wavelength on a detector. A processor 72) is coupled to the detector output and pulses the laser. The processor analyzes the light levels as a function of wavelength to discriminate for the presence of selected gases by determining a characteristic pattern of light absorption and light emission by the gases. The tunable filter has an acousto-optical crystal of Tl.sub.3 AsSe.sub.3, in which an RF acoustic wave is generated for varying diffraction of light by the filter, thereby selecting a wavelength. A nonlinear output crystal selectively generates harmonics for increasing wavelength coverage, and can also be Tl.sub.3 AsSe.sub.3. When the laser is off, the filter acts on infrared emissions of the gases. Sensitivity to narrow emission lines is increased by modulating the RF drive to the tunable filter, producing derivatives of the spectra.

摘要翻译： 在露天的气氛中可以辨认出污染物等气体，优选使用激光沿着视线通过红外光束照射气体。 望远镜沿着视线路径被引导并且收集来自气体的光，激光和望远镜的组合允许将视线路重定向到任何目标，例如堆叠的逸散发射。 光学可调谐滤光器耦合到望远镜，用于选择特定的光学波长或波段，并将经滤波的波长聚焦在检测器上。 处理器72）耦合到检测器输出并脉冲激光。 处理器通过确定气体的光吸收和发光的特征图案来分析作为波长的函数的光水平，以区分选定气体的存在。 可调滤波器具有Tl3AsSe3的声光晶体，其中产生用于通过滤波器改变光的衍射的RF声波，从而选择波长。 非线性输出晶体选择性地产生用于增加波长覆盖的谐波，并且也可以是Tl3AsSe3。 当激光器关闭时，滤光器作用于气体的红外发射。 通过将RF驱动调制到可调谐滤波器来增加对窄发射线的灵敏度，产生光谱的衍生物。

公开(公告)号：US4853543A

公开(公告)日：1989-08-01

申请号：US43962

申请日：1987-04-29

申请人： Phillip Ozdemir

发明人： Phillip Ozdemir

IPC分类号： G01N21/39 ,  G01V9/00

CPC分类号： G01N21/39 ,  G01V9/007 ,  G01N2021/394 ,  G01N2021/395

摘要： A method and apparatus for airborne prospecting for base and precious metal deposits, petroleum and natural gas deposits, geothermal steam deposits, and leaks in natural gas pipelines. A trace gas associated with the deposits in the near-surface atmosphere is detected with a differential absorption optical technique utilizing only a single laser beam to perform remote differential optical measurement. Anomalies in the tracer gas, which are indicative of underground deposits, are detected by transmiting a laser beam having narrow linewidth laser pulses at a high repetition rate with a center wavelength approximately equal to the atomic absorption line of the tracer gas to the area under investigation. The pulses are directed toward the investigated area from an airborne platform, reflected off the ground, and are collected by a detector on the airborne platform. Each pulse received is then broken down into a portion containing energy which is coincident with the absorption line of the tracer gas and a portion which is non-coincident with the absorption line of the tracer gas using a special optical filter. A tracer gas cell removes all the energy from the pulse which is coincident with the tracer gas absorpotion line, and the energy detected from the tracer gas cell corresponds to the amount of energy in the pulse which is off-resonance. By subtracting the off-resonance energy from the total energy received, it is possible to calculate the energy in the pulse which is received in the on-resonance spectral interval.

摘要翻译： 基础和贵金属矿床，石油天然气矿床，地热蒸汽沉积物和天然气管道泄漏的空中勘探方法和装置。 利用仅使用单个激光束进行远程差分光学测量的差分吸收光学技术来检测与近表面气氛中的沉积相关的痕量气体。 通过以高重复率将具有窄线宽激光脉冲的激光束以大致等于示踪气体的原子吸收线的中心波长传输到被调查的区域来检测示踪气体中的地下沉积物的异常 。 脉冲从机载平台引导到被调查区域，从地面反射，并由机载平台上的检测器收集。 接收的每个脉冲然后被分解成包含与示踪气体的吸收线重合的能量的部分和使用特殊光学滤波器与示踪气体的吸收线不一致的部分。 示踪气体细胞从与示踪气体吸收线重合的脉冲中去除所有能量，并且从示踪气体细胞检测到的能量对应于不共振的脉冲中的能量。 通过从接收的总能量中减去非共振能量，可以计算在共振频谱间隔中接收的脉冲中的能量。