公开(公告)号：US5541413A

公开(公告)日：1996-07-30

申请号：US307734

申请日：1994-09-26

Applicant: Lee H. Pearson ,  Kendall B. Johnson ,  Timothy E. Doyle

Inventor： Lee H. Pearson ,  Kendall B. Johnson ,  Timothy E. Doyle

IPC: G01B11/30 ,  F02K9/96 ,  G01B11/06 ,  G01J3/12 ,  G01N21/17 ,  G01N21/21 ,  G01N21/31 ,  G01N21/59 ,  G01N21/64 ,  G01N21/84 ,  G01N21/88 ,  G01N21/93 ,  G01N21/94 ,  G01N21/35

CPC classification number: G01B11/0625 ,  G01N21/17 ,  G01N21/314 ,  G01N21/6456 ,  G01N21/8806 ,  G01N21/94 ,  G01J3/1256 ,  G01N2021/3133 ,  G01N2021/4709 ,  G01N2021/8427 ,  G01N2021/945 ,  G01N21/21 ,  G01N21/4738 ,  G01N21/474 ,  G01N21/5911 ,  G01N21/8422 ,  G01N21/93

Abstract: A scanning system (10) for inspecting a surface (16) including a light source (30) which generates a beam of light (32) that is reflected, scattered or causes fluorescence at the surface to be inspected. An optical interface (14) receives the beam of light and directs it along a predetermined path extending to and from the surface. An acousto-optic tunable filter (34) tuned to pass light having a wavelength corresponding to a known optical property of a predetermined material is positioned within the path of light. A detector (42) is positioned to receive light emanating from the surface and is configured to monitor the intensity of light at each predetermined wavelength being monitored and generate a corrsponding signal. The system is preferably attached to a scan board (90) thereby enabling the system to be used in scanning a surface. The system also includes a signal processor (22) which processes the signal generated by the detector. The resulting data is displayed by an output device (26).

Abstract translation: PCT No.PCT / US93 / 03831 Sec。 371日期：1994年9月26日 102（e）1994年9月26日PCT 1993年4月23日PCT公布。 公开号WO93 / 22655 日期：1993年11月11日一种用于检查包括产生在被检测表面上被反射，散射或引起荧光的光束（32）的光源（30）的表面（16）的扫描系统（10）。 光学接口（14）接收光束并沿着从表面延伸的预定路径引导光束。 被调谐以通过具有对应于预定材料的已知光学特性的波长的光的声光可调谐滤光器（34）位于光路中。 定位检测器（42）以接收从表面发出的光，并且被配置为监测在被监视的每个预定波长处的光的强度并产生相应的信号。 该系统优选地附接到扫描板（90），从而使得系统能够用于扫描表面。 该系统还包括处理由检测器产生的信号的信号处理器（22）。 所得到的数据由输出设备（26）显示。

公开(公告)号：US5317379A

公开(公告)日：1994-05-31

申请号：US833530

申请日：1992-02-11

Applicant: Frederick M. Ryan ,  James W. Thomson

Inventor： Frederick M. Ryan ,  James W. Thomson

IPC: G01J3/12 ,  G01N21/25 ,  G01J3/06 ,  G01N21/31 ,  G01N21/35

CPC classification number: G01N21/253 ,  G01J3/1256 ,  G01N2201/0826

Abstract: An analyzer measures properties of multiple chemical samples, and includes an optical filter element having a long axis and positioned at a location where simultaneous multiple light beams, corresponding to the chemical samples to be measured, form a diffuse light spot elongated along an axis which is substantially aligned with the filter element long axis. The analyzer also includes a light source, filter means incorporating the filter element for transmitting spectrally selected portions of the light beams, sample cell means for exposing each sample to its associated light beam, and detector means for detecting the light beams after modification by the samples and after transmission by the filter. In a preferred embodiment, optical fibers carry the light beams to and from the chemical samples.

Abstract translation: 一种分析仪测量多个化学样品的性质，并且包括具有长轴并且位于与要测量的化学样品相对应的同时多个光束形成沿轴线延伸的漫射光点的位置处的光学滤光元件， 基本上与过滤元件长轴对齐。 分析仪还包括一个光源，滤光片装置结合有滤光元件，用于透射光谱选择的光束部分，用于将每个样品暴露于其相关联的光束的采样单元装置，以及用于检测由样本修改之后的光束的检测器装置 并通过过滤器传输。 在优选实施例中，光纤将光束传送到化学样品和从化学样品携带光束。

公开(公告)号：US5144374A

公开(公告)日：1992-09-01

申请号：US684041

申请日：1991-04-11

Applicant: Giorgio Grego

Inventor： Giorgio Grego

IPC: G01J3/12 ,  G01J3/00 ,  G01J3/02 ,  G01J3/28 ,  G01J3/44 ,  G01J11/00 ,  G01N21/27 ,  G01N21/65

CPC classification number: G01J3/44 ,  G01J3/02 ,  G01J3/0218 ,  G01M11/338 ,  G01J11/00 ,  G01J2003/1265 ,  G01J3/1256 ,  G01J3/2803 ,  G01J3/2889

Abstract: An optical spectroscopy system, wherein a pulse of a radiation to be analyzed is sent to a diffractive element presenting high temporal chromatic dispersion, and information relevant to the radiation spectrum is obtained from pulse broadening in the time domain.

公开(公告)号：US5131742A

公开(公告)日：1992-07-21

申请号：US597457

申请日：1990-10-12

Applicant: Fred L. Schaff

Inventor： Fred L. Schaff

IPC: G01J3/12 ,  G01J3/28 ,  G01J3/447

CPC classification number: G01J3/447 ,  G01J3/2823 ,  G01J2003/1247 ,  G01J3/0256 ,  G01J3/1256

Abstract: An acousto-optic spectrometer/polarimeter for analyzing an incident broad-band beam including an acousto-optic tunable filter (AOTF) for separating the incident broad-band beam into a diffracted extraordinary narrow-band beam, a diffracted ordinary narrow-band beam, and at least one undiffracted broad-band beam; first, second and third detectors respectively positioned to respectfully receive at least a portion of the diffracted extraordinary narrow-band beam, the diffracted ordinary narrow broad-band beam and the at least one undiffracted broad-band beam, and to respectively provide first, second and third signals based thereon; a subtracter for providing a polarimeter output by taking the difference between the first and the second signals; and an adder for providing a spectrometer output by adding the first and the second signals. The acousto-optic spectrometer/polarimeter according to the present invention allows broad-band imaging, spectroscopy and polarimetry to be performed simultaneously and through the same optical aperture.

Abstract translation: 一种用于分析包括声光可调滤波器（AOTF）的入射宽带束的声光谱仪/偏振计，用于将入射的宽带束分离成衍射的非常窄带束，衍射的普通窄带束， 和至少一个未衍射的宽带束; 第一，第二和第三检测器被分别定位成尊重地接收衍射的非常窄带束，衍射普通窄带宽波束和至少一个未衍射宽带波束的至少一部分，并且分别提供第一，第二，第二 和基于此的第三信号; 减法器，用于通过取第一和第二信号之间的差来提供偏振计输出; 以及用于通过添加第一和第二信号来提供光谱仪输出的加法器。 根据本发明的声光谱仪/偏光计允许同时进行宽带成像，光谱学和偏振测定，并且通过相同的光学孔径。

公开(公告)号：US5120961A

公开(公告)日：1992-06-09

申请号：US494342

申请日：1990-03-16

Applicant: Kenneth H. Levin ,  Frank Y. Li

Inventor： Kenneth H. Levin ,  Frank Y. Li

IPC: G01J1/44 ,  G01J3/02 ,  G01J3/12 ,  G01J3/42

CPC classification number: G01J3/02 ,  G01J3/0218 ,  G01J3/1256 ,  G01J2001/4242 ,  G01J3/42

Abstract: An acousto-optical filter (AOTF) is used in a spectrometer for analysis of samples. The spectrometer provides continuous wave RF excitation through the crystal, and the spectrometer provides control and modulation for said RF source. The signal to noise ratio is improved by use of a lock-in amplifier which demodulates the modulation frequency. Fiber optics are used to connect the crystal to the source, and the source to the detection system. A digital lock-in amplifier is designed which increases the efficiency, accuracy, sensitivity and decreases the cost of conventional analog lock-in amplifier.

Abstract translation: 在光谱仪中使用声光滤波器（AOTF）来分析样品。 光谱仪通过晶体提供连续波RF激发，光谱仪为所述RF源提供控制和调制。 通过使用解调调制频率的锁相放大器来提高信噪比。 光纤用于将晶体连接到源，将源连接到检测系统。 设计了一种数字锁相放大器，可提高传统模拟锁定放大器的效率，精度，灵敏度和降低成本。

公开(公告)号：US5002395A

公开(公告)日：1991-03-26

申请号：US305196

申请日：1989-02-02

Applicant: Manhar L. Shah

Inventor： Manhar L. Shah

IPC: G01R23/17

CPC classification number: G01J3/1256 ,  G01J3/02 ,  G01J3/0224 ,  G01J3/2803 ,  G01J3/453 ,  G01J3/457 ,  G01R23/17

Abstract: An interferometric spectrum analyzer employs a pair of Bragg cells arranged in an optically cascaded configuration such that both the signal beam and the reference beam travel along a common optical path. The beam-modifying properties of the Bragg cells are such that within a prescribed bandwidth of operation, the deflection properties of the respective cells are frequency complementary, namely different frequencies applied to the respective cells deflect the beam passing therethrough along the same optical path, to produce a beat frequency at the Fourier transform plane. In accordance with a first embodiment, complementary deflection action is achieved by using Bragg cells having respectively different acoustic velocites. In a second embodiment, each Bragg cell has the same acoustic velocity. The deflection/frequency complementary effect is obtained by the use of a birefringent material prism interposed between the Bragg cells, which produces angular deviation that depends upon the polarization and the direction of propagation of light passing through the prism.

Abstract translation: 干涉测量频谱分析仪采用布置在光级联配置中的一对布拉格单元，使得信号光束和参考光束沿着公共光路传播。 布拉格单元的波束修正特性使得在规定的操作带宽内，各个单元的偏转特性是频率互补的，即施加到各个单元的不同频率将沿着相同光路偏转的光束偏转到 在傅立叶变换平面产生拍频。 根据第一实施例，通过使用具有不同声速的布拉格电池来实现互补偏转动作。 在第二实施例中，每个布拉格单元具有相同的声速。 偏转/频率互补效应通过使用插入在布拉格单元之间的双折射材料棱镜获得，其产生取决于通过棱镜的光的偏振和传播方向的角度偏差。

公开(公告)号：US4652756A

公开(公告)日：1987-03-24

申请号：US736199

申请日：1985-05-20

Applicant: Frederick M. Ryan ,  Robert L. Nelson

Inventor： Frederick M. Ryan ,  Robert L. Nelson

IPC: G01N21/35 ,  G01J3/12 ,  G01J3/42 ,  G01N21/53 ,  G02F1/11

CPC classification number: G01J3/1256 ,  G01J3/42 ,  G01N2021/536 ,  G01N21/3504

Abstract: An improved automated acousto-optic analyzer system includes an acousto-optic tunable filter which is coupled with a source of radiation to produce pulsed light at predetermined wavelengths. This light is transmitted through a gas stack containing gases to be analyzed, to a distant detector. The configuration of the acousto-optic tunable filter, radiation source on one side of an environment of interest and a detector on the opposite side of an environment of interest produces spatial separation of the tuned, diffracted light from the undiffracted broad spectrum of the light source at the detector. This configuration eliminates the need for polarizers in the system. It also combines the tuning function of the AOTF with a chopping function, allowing extraneous radiation to be discriminated against. Thus the improved configuration of the disclosed invention permits effective operation of the gas analysis system in a gas stack characterized by extremely high ambient temperatures.

Abstract translation: 改进的自动声光分析仪系统包括声光可调滤波器，其与辐射源耦合以产生预定波长的脉冲光。 该光通过包含待分析气体的气体堆叠传输到远距离检测器。 声光可调谐滤波器，感兴趣环境一侧的辐射源和感兴趣的环境相对侧上的检测器的配置产生了调谐的衍射光与光源的未衍射广谱的空间分离 在检测器。 该配置消除了系统中偏振器的需要。 它还将AOTF的调谐功能与斩波功能结合在一起，允许对外部辐射进行区分。 因此，所公开的发明的改进的构造允许气体分析系统在特征在于极高的环境温度的气体堆叠中的有效操作。

公开(公告)号：US4622845A

公开(公告)日：1986-11-18

申请号：US714582

申请日：1985-03-21

Applicant: Frederick M. Ryan ,  Donald W. Feldman

Inventor： Frederick M. Ryan ,  Donald W. Feldman

IPC: G01N21/00 ,  G01J3/12 ,  G01N21/17 ,  G01N29/00

CPC classification number: G01N21/1702 ,  G01J3/1256 ,  G01N2021/1704

Abstract: The invention provides an apparatus for the detection of a selected species in a gas sample and includes a photo-acoustic detector coupled to an infrared radiation source with an acousto-optic tunable filter disposed between the source of infrared radiation and photo-acoustic detector. This combination is capable of measuring concentrations of controlled vapors in the parts-per-million range. These measurements may be performed in a few seconds via the portable gas detection and measurement device of this invention.

Abstract translation: 本发明提供了一种用于检测气体样品中所选物种的装置，并且包括耦合到红外辐射源的光声检测器，其中设置在红外辐射源和光声检测器之间的声光可调谐滤光器。 这种组合能够测量百万分之几的受控蒸气浓度。 这些测量可以在几秒钟内通过本发明的便携式气体检测和测量装置进行。

公开(公告)号：US12007323B2

公开(公告)日：2024-06-11

申请号：US17991721

申请日：2022-11-21

Applicant: EPIR, Inc.

Inventor： Wei Gao ,  Chang Yong ,  Silviu Velicu ,  Sivalingam Sivananthan

IPC: G01J3/10 ,  G01J3/12 ,  G01N21/25 ,  G01N21/35

CPC classification number: G01N21/255 ,  G01J3/108 ,  G01J3/1256 ,  G01N21/35

Abstract: A multiband IR adjunct (MIRA) sensor to spectroscopically determine the content and the concentration of chemical composition of a targeted object, includes a sensor housing, a first front optics in a first optical channel, a second front optics in the first optical channel, an acousto-optic tunable filter (AOTF), a photo detector (PD), a set of back optics in the first optical channel that focuses polarized narrow-band light beams received from the AOTF device onto the PD, the PD converting the polarized narrow-band light beams into an electrical signal, and a data acquisition unit signal-connected to the PD, the data acquisition unit collecting the electrical signals. Multiple optical channels can be provided within the housing to analyze UV/VIS/near infrared (NIR), short-wavelength infrared (SWIR), mid-wavelength infrared (MWIR), and LWIR wavelength ranges respectively.

公开(公告)号：US20180364158A1

公开(公告)日：2018-12-20

申请号：US15628566

申请日：2017-06-20

Applicant: KONICA MINOLTA LABORATORY U.S.A., INC.

Inventor： Leiming Wang ,  Jun Amano

IPC: G01N21/3581 ,  G06K9/00 ,  G01J3/12

CPC classification number: G01N21/3581 ,  G01J3/108 ,  G01J3/1256 ,  G01J2003/423 ,  G06K9/0063

Abstract: A terahertz (THz) spectral imaging system includes a THz 2D imaging camera, a tunable THz bandpass filter before the THz camera, and a broadband THz light source. The tunable THz bandpass filter includes a visible or infrared laser source, a spatial light modulator modulating the light to generate a spatially structured light pattern, and a semiconductor plate onto which the light pattern is projected. The light pattern generates carriers in the semiconductor plate to turn it into a metamaterial THz bandpass filter, which is tunable by changing the light patterns. A controller controls the light patterns and the THz camera in a timing sequence to acquire multiple 2D THz images at different THz frequencies. Such THz spectral image data can be further combined with visible images and LiDAR images in a security surveillance system to automatically detect security threats using image fusion and deep learning techniques.