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1. 发明授权

US09964442B2 Terahertz spectroscopy system and method 有权
公开(公告)号：US09964442B2
公开(公告)日：2018-05-08
申请号：US15056245
申请日：2016-02-29
申请人： NOVATRANS GROUP SA
发明人： John F. Roulston , Daniel Mandelik
IPC分类号： G01B9/02 , G01J3/45 , G01J3/10 , G01J3/42 , G01J3/433
CPC分类号： G01J3/108 , G01J3/42 , G01J3/433 , G01J3/4338 , G01J2003/4332 , G01N21/3581
摘要： A terahertz spectrometer includes: a terahertz-wave emitter and a terahertz receiver elements. The terahertz wave generated by means of generating beat frequency corresponding to the difference between two rapidly tunable continuous wave lasers. Having a difference in time between the interrogating signal and the reference signal at the receiver end side, which corresponds to intermediate frequency (IF), not centered around the baseband, i.e. zero Hertz. The offset step size of the intermediate frequency from zero Hertz is linearly correlated to the position of the interrogated object position.

2. 发明申请

US20170067822A1 CAVITY ENHANCED SPECTROSCOPY USING OFF-AXIS PATHS 审中-公开
标题翻译： CAVITY增强光谱使用离轴PATHS
公开(公告)号：US20170067822A1
公开(公告)日：2017-03-09
申请号：US15336045
申请日：2016-10-27
申请人： NewSouth Innovations Pty Limited
发明人： Charles Charbel HARB , Toby Kristian BOYSON
IPC分类号： G01N21/39 , G01J3/02 , G01J3/433
CPC分类号： G01N21/39 , G01J3/0208 , G01J3/433 , G01J2003/4332 , G01J2003/4334 , G01N21/031 , G01N2021/391 , G01N2201/0691
摘要： Methods and apparatuses (500) of generating and processing a real-time time-domain cavity ringdown spectroscopy (CRDS) signal from absorbing species m an optical detection system having an optical ringdown cavity (200) using off-axis paths (230) are provided. At least one modulated light signal (570) is generated using one or more light sources (520), each modulated at specified modulation frequency. Each modulated signal has harmonic frequency components and is input off-axis (230) relative to the cavity's optical axis (220). The cavity contains mirrors (210, 212, 214; 310; 410; 510, 512, 514) arranged in a predetermined configuration. The optical axis (220) is defined by a path passing through centers of mirrors (210, 212, 214; 310; 410; 510, 512, 514). The modulated light signal (570) is resonated off axis (230) without astigmatic optical. elements to produce CRDS signal and passes at least twice through cavity and across the mirrors (210, 212, 214; 310; 410; 510, 512, 814) without interfering, with itself. An overall path length through cavity is greater than path length of optical axis. A photodetector detects (550) the CROS signal, which is demodulated (560) dependent upon selected harmonics.
摘要翻译：提供了在具有使用离轴路径（230）的具有光学环形腔（200）的光学检测系统中从吸收物质生成和处理实时时域空穴衰减光谱（CRDS）信号的方法和装置（500）。使用一个或多个光源（520）产生至少一个调制光信号（570），每个光源以规定的调制频率被调制。每个调制信号具有谐波频率分量，并且相对于空腔的光轴（220）输入离轴（230）。腔体包含以预定构造布置的反射镜（210,212,214; 310; 410; 510,512,514）。光轴（220）由穿过反射镜（210,212,214; 310; 410; 510,512,514）的中心的路径限定。调制光信号（570）在没有散光光学的情况下离轴（230）谐振。元件以产生CRDS信号并且通过腔并至少穿过镜子（210,212,214; 310; 410; 510,512,814），而不会自身干涉。通过腔的总路径长度大于光轴的路径长度。光电检测器检测（550）取决于所选谐波的解调（560）的CROS信号。

3. 发明授权

US5268745A Light radiation absorption gas detector 失效
标题翻译：光辐射吸收气体探测器
公开(公告)号：US5268745A
公开(公告)日：1993-12-07
申请号：US873951
申请日：1992-04-24
申请人： Brian A. Goody
发明人： Brian A. Goody
IPC分类号： G01J1/04 , G01J3/12 , G01J3/433 , G01N21/31 , G01N21/35 , G01N21/59 , G01N21/27
CPC分类号： G01J3/433 , G01N21/31 , G01J2003/1243 , G01J2003/4332 , G01N21/3504
摘要： A light radiation absorption gas detector for detecting the presence of a specified gas, comprising a light source, a region containing a gas to be detected through which light from the source is passed, an interference filter having a substantially flat face and a light radiation absorption peak at a wavelength which facilitates detection of the specified gas, a shaft to which the filter is by means of arms secured for rotation so that a perpendicular to the flat face of the filter is at an angle to the axis of the rotation and light detector means responsive to light from the source which has passed through the region and the filter, for detecting predetermined light amplitude variations, wherein light from the source is arranged to be projected towards the filter at an angle offset from the axis of shaft rotation whereby a filter pass band which includes the said wavelength is scanned consequent upon rotation of the filter, thereby to produce amplitude variations of light in the presence within the region of the specified gas, whereby detection of the specified gas by the detector means is facilitated.

4. 发明授权

US4850697A Resonant piezoelectric chopper for infrared radiation 失效
标题翻译：用于红外辐射的谐振压电斩波器
公开(公告)号：US4850697A
公开(公告)日：1989-07-25
申请号：US168966
申请日：1988-03-16
申请人： Larry J. Schoennauer , Ronald B. Alers , Keith Kaste , Ross E. Johnson , Jacob Y. Wong
发明人： Larry J. Schoennauer , Ronald B. Alers , Keith Kaste , Ross E. Johnson , Jacob Y. Wong
IPC分类号： G01J3/12 , G01J3/433 , G01J5/62 , G01N21/31 , G01N21/35
CPC分类号： G01J3/12 , G01J5/62 , G01J2003/123 , G01J2003/4332 , G01J3/0232 , G01J3/0289 , G01N2021/3174 , G01N21/3504
摘要： Apparatus for inserting and removing several filters from an optical path and for determining at all times the instantaneous positional relationship of each filter with respect to the optical path includes a set of filters mounted on a carrier which is attached to a resonant piezoelectric system, and further includes reference tracks also located on the carrier and extending in the direction of the oscillatory motion and including a sequence of binary indicia progressing in the direction of the oscillatory motion. The reference tracks are read optically to produce a series of binary electrical signals which are processed to yield the instantaneous position of the carrier and filters with respect to a fixed optical path.
摘要翻译：用于从光路插入和去除多个滤光器并且用于随时确定每个滤光器相对于光路的瞬时位置关系的装置包括安装在附着于谐振压电系统的载体上的一组滤光器，包括也位于载体上并在振荡运动方向上延伸的参考轨道，并且包括沿振荡运动方向前进的二进制标记序列。参考轨道被光学读取以产生一系列二进制电信号，这些二进制电信号被处理以产生载体和滤波器相对于固定光路的瞬时位置。

5. 发明授权

US2834246A Method and apparatus for absorption spectra analysis 失效
标题翻译：吸收光谱分析方法和装置
公开(公告)号：US2834246A
公开(公告)日：1958-05-13
申请号：US43730754
申请日：1954-06-16
申请人： FOSKETT LAURENCE W , FOSTER NORMAN B , THICKSTUN WILLIAM R , WOOD REX C
发明人： FOSKETT LAURENCE W , FOSTER NORMAN B , THICKSTUN WILLIAM R , WOOD REX C
IPC分类号： G01J3/433 , G01N21/31
CPC分类号： G01J3/433 , G01J2003/4332 , G01N21/314

6. 发明授权

US11913835B1 Vector noise subtraction in vapor cell spectroscopy 有权
公开(公告)号：US11913835B1
公开(公告)日：2024-02-27
申请号：US18353175
申请日：2023-07-17
申请人： Vector Atomic, Inc.
发明人： Micah Perry Ledbetter , Martin Machai Boyd , Andrew Vernon Dowd , William David Lunden , Jonathan David Roslund
IPC分类号： G01J3/433
CPC分类号： G01J3/4338 , G01J2003/4332
摘要： Embodiments herein describe spectroscopy systems that use an unmodulated reference optical signal to mitigate noise, or for other advantages. In one embodiment, the unmodulated reference optical signal is transmitted through the same vapor cell as a modulated pump optical signal. As such, the unmodulated reference optical signal experiences absorption by the vapor, which converts laser phase noise to amplitude noise like the other optical signals passing through the vapor cell. In one embodiment, the unmodulated reference optical signal has an optical path in the gas cell that is offset (or non-crossing) from the optical path of the modulated pump optical signal. The unmodulated reference optical signal allows removal or mitigation of the noise on the other optical signal.

7. 发明授权

US11796392B2 Dual-comb spectroscopy 有权
公开(公告)号：US11796392B2
公开(公告)日：2023-10-24
申请号：US18063213
申请日：2022-12-08
申请人： IRsweep AG
发明人： Stéphane Schilt , Pierre Brochard , Kenichi Komagata , Giulio Terrasanta , Andreas Hugi
IPC分类号： G01J3/433 , G01J3/10 , H01S5/40 , H01S5/062 , G01J3/42
CPC分类号： G01J3/433 , G01J3/10 , H01S5/0623 , H01S5/4006 , G01J2003/102 , G01J2003/423 , G01J2003/4332
摘要： A dual-comb spectrometer comprising two lasers outputting respective frequency combs having a frequency offset between their intermode beat frequencies. One laser acts as a master and the other as a follower. Although the master laser is driven nominally with a DC drive signal, the current on its drive input line nevertheless oscillates with an AC component that follows the beating of the intermode comb lines lasing in the driven master laser. This effect is exploited by tapping off this AC component and mixing it with a reference frequency to provide the required frequency offset, the mixed signal then being supplied to the follower laser as the AC component of its drive signal. The respective frequency combs in the optical domain are thus phase-locked relative to each other in one degree of freedom, so that the electrical signals obtained by multi-heterodyning the two optical signals are frequency stabilized.

8. 发明授权

US11747204B2 High sensitivity frequency-domain spectroscopy system 有权
公开(公告)号：US11747204B2
公开(公告)日：2023-09-05
申请号：US17394143
申请日：2021-08-04
申请人： The Johns Hopkins University
发明人： Scott M. Hendrickson , Jeremiah J. Wathen , Michael J. Fitch , David W. Blodgett , Vincent R. Pagan
IPC分类号： G01J3/433 , G02B3/04 , G01J3/02 , G01J3/28
CPC分类号： G01J3/4338 , G01J3/0208 , G01J3/0264 , G01J3/2823 , G02B3/04 , G01J2003/4332
摘要： A system includes first and second radiation sources, first and second detectors, a signal digitizer, a controller, and an analyzer. The first and second radiation sources generate respective first and second beams of radiation to irradiate a target. The first beam and second beams each include a first wavelength operated at a first modulation frequency and a second wavelength operated at a second modulation frequency. The first and second detectors each include a photo-sensitive element that generate first or second detection signals, a Faraday shielding enclosure, a signal amplifier, and a frequency mixer to frequency-adjust the first or second detection signals. The controller provides timing information to inform an activation scheme of the first and second radiation sources and corresponding radiation detection events at the first and second detectors. The analyzer analyzes the first and second detection signals and determines at least amplitude and phase information of the scattered radiation.

9. 发明申请

US20180233877A1 GENERATING LASER PULSES AND SPECTROSCOPY USING THE TEMPORAL TALBOT EFFECT 审中-公开
公开(公告)号：US20180233877A1
公开(公告)日：2018-08-16
申请号：US15891343
申请日：2018-02-07
申请人： Max-Planck-Gesellschaft zur Foerderung der Wissenschaften e. V.
发明人： Thomas UDEM , Akira OZAWA
IPC分类号： H01S3/11 , H01S3/00 , H01S3/067 , G01J3/433 , G01J3/02 , G01N21/39
CPC分类号： H01S3/1121 , G01J3/0218 , G01J3/10 , G01J3/4338 , G01J9/04 , G01J2003/282 , G01J2003/4332 , G01N21/39 , G01N2021/391 , G01N2021/399 , G01N2201/0697 , H01S3/0057 , H01S3/0675 , H01S3/06791 , H01S3/1109 , H01S3/1112
摘要： A method of generating laser pulses (1) includes: creating a circulating light field in resonator device (11) having resonator length L and an intra-cavity dispersion and configured for supporting light field resonator modes, and generating a pulse train of laser pulses (1) by a mode-locking mechanism. Laser pulses (1) are generated with a repetition frequency and provide a frequency comb with carrier frequency ωo and comb modes in frequency space. The intra-cavity dispersion is selected such that round trip phases ϕ have a dependency on frequency ω according to φ  ( ω ) = π   m  ( 1 + 4   ω - ω 0 m   ω r - 1 ) + L c  ω 0 wherein m is an integer providing effective repetition rate (mωr) in combination with mode spacing ωr at optical carrier frequency (ωo), and the mode-locking mechanism provides a coupling of the resonator modes whereby frequency difference (Δn=ωn+1−ωn) between neighboring mode frequencies (ωn, ωn+1) is a linear function of mode frequency number n. Furthermore, a spectroscopy method for investigating a sample, a laser pulse source apparatus and a spectroscopy apparatus are described.

10. 发明申请

US20180100999A1 MODULATING SPECTROSCOPIC IMAGING SYSTEM USING SUBSTANTIALLY COHERENT ILLUMINATION 审中-公开
公开(公告)号：US20180100999A1
公开(公告)日：2018-04-12
申请号：US15840476
申请日：2017-12-13
申请人： DAYLIGHT SOLUTIONS, INC.
发明人： Jeremy Rowlette , Edeline Fotheringham , Justin Kane , Mark V. Bermal , David Nichols , William Chapman
IPC分类号： G02B21/00 , G01J3/02 , G01J1/00 , G02B21/36 , G02B21/08 , G01J3/28 , G01J3/12 , H01S5/14
CPC分类号： G02B21/0072 , G01J1/00 , G01J3/021 , G01J3/10 , G01J3/2803 , G01J3/4338 , G01J2003/1226 , G01J2003/1273 , G01J2003/2826 , G01J2003/4332 , G01J2003/4334 , G02B21/0032 , G02B21/0056 , G02B21/0064 , G02B21/088 , G02B21/367 , H01S5/141
摘要： A spectral imaging device (12) for generating an image (13A) of a sample (10) includes (i) an image sensor (30); (ii) a tunable light source (14) that generates an illumination beam (16) that is directed at the sample (10); (iii) an optical assembly (22) that collects light from the sample (10) and forms an image of the sample (10) on the image sensor (30); and (iv) a control system (32) that controls the tunable light source (14) and the image sensor (30). During a time segment, the control system (32) (i) controls the tunable light source (14) so that the illumination beam (16) has a center wavenumber that is modulated through a first target wavenumber with a first modulation rate; and (ii) controls the image sensor (30) to capture at least one first image at a first frame rate. Further, the first modulation rate is equal to or greater than the first frame rate.

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