US20030210398A1 - System and method for controlling a light source for cavity ring-down spectroscopy - Google Patents

System and method for controlling a light source for cavity ring-down spectroscopy Download PDF

Info

Publication number
US20030210398A1
US20030210398A1 US10/145,209 US14520902A US2003210398A1 US 20030210398 A1 US20030210398 A1 US 20030210398A1 US 14520902 A US14520902 A US 14520902A US 2003210398 A1 US2003210398 A1 US 2003210398A1
Authority
US
United States
Prior art keywords
light source
delay
signal
resonant cavity
controller
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US10/145,209
Other languages
English (en)
Inventor
Robert Augustine
Calvin Krusen
Chuji Wang
Wen-Bin Yan
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tiger Optics LLC
Original Assignee
Tiger Optics LLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tiger Optics LLC filed Critical Tiger Optics LLC
Priority to US10/145,209 priority Critical patent/US20030210398A1/en
Assigned to TIGER OPTICS L.L.C. reassignment TIGER OPTICS L.L.C. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KRUSEN, CALVIN R., WANG, CHUJI, YAN, WEN-BIN, AUGUSTINE, ROBERT
Priority to ES03701996T priority patent/ES2259756T3/es
Priority to AU2003202884A priority patent/AU2003202884A1/en
Priority to AT03701996T priority patent/ATE320591T1/de
Priority to DE60304027T priority patent/DE60304027T2/de
Priority to JP2004505651A priority patent/JP4693409B2/ja
Priority to EP03701996A priority patent/EP1497627B1/en
Priority to CN038110229A priority patent/CN1653319B/zh
Priority to PCT/US2003/000206 priority patent/WO2003098173A1/en
Priority to TW092102730A priority patent/TW584717B/zh
Publication of US20030210398A1 publication Critical patent/US20030210398A1/en
Priority to US11/252,128 priority patent/US7277177B2/en
Abandoned legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/02—Details
    • G01J3/10—Arrangements of light sources specially adapted for spectrometry or colorimetry
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
    • G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
    • G01N21/39—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using tunable lasers

Definitions

  • This invention relates generally to absorption spectroscopy and, in particular, is directed to the activation and deactivation of a light source for use with an optical resonator for cavity ring-down spectroscopy.
  • FIG. 1 illustrates the electromagnetic spectrum on a logarithmic scale.
  • the science of spectroscopy studies spectra.
  • optics particularly involves visible and near-visible light—a very narrow part of the available spectrum which extends in wavelength from about 1 mm to about 1 nm.
  • Near visible light includes colors redder than red (infrared) and colors more violet than violet (ultraviolet). The range extends just far enough to either side of visibility that the light can still be handled by most lenses and mirrors made of the usual materials. The wavelength dependence of optical properties of materials must often be considered.
  • Absorption-type spectroscopy offers high sensitivity, response times on the order of microseconds, immunity from poisoning, and limited interference from molecular species other than the species under study.
  • Various molecular species can be detected or identified by absorption spectroscopy.
  • absorption spectroscopy provides a general method of detecting important trace species. In the gas phase, the sensitivity and selectivity of this method is optimized because the species have their absorption strength concentrated in a set of sharp spectral lines. The narrow lines in the spectrum can be used to discriminate against most interfering species.
  • Spectroscopy has obtained parts per million (ppm) level detection for gaseous contaminants in high-purity gases. Detection sensitivities at the ppb level are attainable in some cases. Accordingly, several spectroscopic methods have been applied to such applications as quantitative contamination monitoring in gases, including: absorption measurements in traditional long pathlength cells, photoacoustic spectroscopy, frequency modulation spectroscopy, and intracavity laser absorption spectroscopy. These methods have several features, discussed in U.S. Pat. No. 5,528,040 issued to Lehmann, which make them difficult to use and impractical for industrial applications. They have been largely confined, therefore, to laboratory investigations.
  • CW-CRDS continuous wave-cavity ring-down spectroscopy
  • CW-CRDS continuous wave-cavity ring-down spectroscopy
  • CW-CRDS has become an important spectroscopic technique with applications to science, industrial process control, and atmospheric trace gas detection.
  • CW-CRDS has been demonstrated as a technique for the measurement of optical absorption that excels in the low-absorbance regime where conventional methods have inadequate sensitivity.
  • CW-CRDS utilizes the mean lifetime of photons in a high-finesse optical resonator as the absorption-sensitive observable.
  • the resonator is formed from a pair of nominally equivalent, narrow band, ultra-high reflectivity dielectric mirrors, configured appropriately to form a stable optical resonator.
  • a laser pulse is injected into the resonator through a mirror to experience a mean lifetime which depends upon the photon round-trip transit time, the length of the resonator, the absorption cross section and number density of the species, and a factor accounting for intrinsic resonator losses (which arise largely from the frequency-dependent mirror reflectivities when diffraction losses are negligible).
  • the determination of optical absorption is transformed, therefore, from the conventional power-ratio measurement to a measurement of decay time.
  • the ultimate sensitivity of CW-CRDS is determined by the magnitude of the intrinsic resonator losses, which can be minimized with techniques such as superpolishing that permit the fabrication of ultra-low-loss optics.
  • FIG. 2 illustrates a conventional CW-CRDS apparatus 200 .
  • light is generated from a narrow band, tunable, continuous wave diode laser 202 .
  • Laser 202 is temperature tuned by a temperature controller (not shown) to put its wavelength on the desired spectral line of the analyte.
  • An acousto-optic modulator (AOM) 204 is positioned in front of and in line with the radiation emitted from laser 202 .
  • AOM 204 provides a means for providing light 206 from laser 202 along the optical axis 219 of resonant cavity 218 .
  • Light 206 exits AOM 204 and is directed by mirrors 208 , 210 to cavity mirror 220 as light 206 a .
  • Detector 212 is coupled between the output of optical cavity 218 and controller 214 .
  • Controller 214 is coupled to laser 202 , processor 216 , and AOM 204 .
  • Processor 216 processes signals from optical detector 212 in order to determine the level of trace species in optical resonator 218 .
  • AOM 204 a pressure transducer (not shown) creates a sound wave that modulates the index of refraction in an active nonlinear crystal (not shown), through a photoelastic effect.
  • the sound wave produces a Bragg diffraction grating that disperses incoming light into multiple orders, such as zero order and first order. Different orders have different light beam energy and follow different beam directions.
  • CW-CRDS typically, a first order light beam 206 is aligned along with optical axis 219 of cavity 218 incident on the cavity in-coupling mirror 220 , and a zero order beam 224 is idled with a different optical path (other higher order beams are very weak and thus not addressed).
  • AOM 204 controls the direction of beams 206 , 224 .
  • AOM 204 When AOM 204 is on, most light power (typically, up to 80%, depending on size of the beam, crystals within AOM 204 , alignment, etc.) goes to the first order along optical axis 219 of resonant cavity 218 as light 206 . The remaining beam power goes to the zero order (light 224 ), or other higher orders.
  • the first order beam 206 is used for the input coupling light source; the zero order beam 224 is typically idled or used for diagnostic components.
  • AOM 204 Once light energy is built up within the cavity, AOM 204 is turned off. This results in all the beam power going to the zero order as light 224 , and no light 206 is coupled into resonant cavity 218 .
  • the stored light energy inside the cavity follows an exponential decay (ring down).
  • AOM 204 In order to “turn off” the laser light to optical cavity 218 , and thus allow for energy within optical cavity 218 to “ring down,” AOM 204 , under control of controller 214 and through control line 224 , redirects (deflects) light from laser 204 along path 224 and, thus, away from optical path 219 of optical resonator 218 .
  • This conventional approach has drawbacks, however, in that there are losses of light energy primarily through the redirecting means contained within the AOM. Other losses may also be present due to mirrors 208 , 210 used to direct light from AOM 204 to optical cavity 218 .
  • An object of the present invention is to replace the conventional AOM/control system with a simplified and cost effective control system.
  • the present invention provides an improved apparatus and method for controlling a light source for use with a resonant cavity.
  • the apparatus includes a controller for receiving a comparison of a detection signal and a predetermined threshold, the comparator generating a control signal to one of activate and deactivate the light source based on the comparison; a first delay circuit coupled to the controller for generating a first delay signal to the controller; and a second delay circuit coupled to the comparator and the controller for generating a second delay signal to the controller based on the comparison of the detection signal and the predetermined threshold.
  • the light source provides light as an input to the resonant cavity to measure the presence of an analyte in the resonant cavity.
  • light from the source is coupled to the resonant cavity by an optical fiber.
  • a collimator couples the light into the resonant cavity.
  • a comparator generates an output signal to the controller based on a comparison of the detection signal and a predetermined threshold.
  • a detector is coupled between the output of the resonant cavity and the comparator, and generates a signal based on the light output from the resonant cavity.
  • the light source is deactivated based on the first delay signal.
  • the light source is activated after an end of the first delay period.
  • the light source is activated and energy builds up within the cavity through the current modulation.
  • an analyte level present in the resonant cavity is measured during the first delay period.
  • the controller deactivates the light source by shunting a supply of current for the light source.
  • the light source is a laser.
  • the method includes the steps of, detecting a light energy signal output from the resonant cavity; comparing the detected signal with a predetermined threshold; generating a control signal to control the light source based on the comparison; generating a first delay signal to the controller; generating a second delay signal after the end of the first delay signal; providing a current modulation; and measuring a level of the analyte after an end of the second delay signal.
  • FIG. 1 illustrates the electromagnetic spectrum on a logarithmic scale
  • FIG. 2 illustrates a prior art CW-CRDS system
  • FIG. 3A illustrates an exemplary embodiment of the present invention
  • FIG. 3B illustrates another exemplary embodiment of the present invention
  • FIG. 4 is an illustration of an exemplary controller of the present invention.
  • FIG. 5 is a graph illustrating various delay timing according to an exemplary embodiment of the present invention.
  • FIG. 3A illustrates an exemplary embodiment of the present invention.
  • light is generated from light source 302 , such as a narrow band, tunable, continuous wave diode laser.
  • Light source 302 is temperature tuned by a temperature controller (not shown) to put its wavelength on the desired spectral line of the analyte of interest.
  • Light energy from light source 302 is coupled to fiber collimator 308 through optical fiber 304 .
  • Light energy 306 is, in turn, provided by collimator 308 to resonant cavity 318 and substantially parallel to its optical axis 319 .
  • Detector 312 is coupled between the output of optical cavity 318 and controller 314 .
  • Controller 314 is coupled to light source 302 and data analysis system 316 .
  • Data analysis system 316 such as a personal computer or other specialized processor, processes signals from optical detector 312 , under control of controller 314 , in order to determine the level of trace species (analyte) in optical resonator 318 .
  • light source 302 is a temperature and current controlled, tunable, narrow line-width radiation, semiconductor laser operating in the visible to near- and middle-infrared spectrum.
  • light source 302 may be an external-cavity semiconductor diode laser.
  • Resonant cavity 318 preferably comprises at least a pair of high reflectivity mirrors 320 , 322 and a gas cell 321 on which the mirrors are mounted.
  • Cell 321 can be flow cell or vacuum cell, for example.
  • resonant cavity 318 may be comprised of a pair of prisms 324 , 326 and a corresponding gas cell 321 .
  • Detector 212 is preferably a photovoltaic detector, such as photodiodes or photo-multiplier tubes (PMT), for example.
  • PMT photo-multiplier tubes
  • buffer 402 receives signal 313 (representing the amplitude of the ring down signal) from detector 312 (shown in FIGS. 3 A- 3 B).
  • Comparator 406 receives buffered signal 313 and performs a comparison with a threshold signal 404 .
  • threshold signal 404 is incremented upward until the output of comparator 406 is a zero state. Then, threshold signal 404 decrements until comparator 406 provides an output signal.
  • threshold signal 404 is based on the level of the ring down signal. In this way, control circuit 408 is able to determine when ring down signal output from detector 312 dissipates.
  • Control circuit 408 generates control signal 408 a based on the dissipation of the ring down signal in order to activate first delay circuit 412 .
  • signal 412 a is generated and provided to control circuit 408 .
  • control circuit 408 generates signal 408 b to activate second delay circuit 414 , and provides signal 408 c to switch circuit 410 , which in turn activates light source 302 (shown in phantom and described above with respect to FIGS. 3A and 3B).
  • delay period t 2 shown in FIG.
  • delay circuit 414 generates signal 414 a to control circuit 408 to indicate that light source 302 has stabilized and to begin a third time period t 3 (shown in FIG. 5).
  • Time period t 3 (described in detail below with respect to FIG. 5) is used to ensure that resonant cavity 318 is fully charged through current modulation with light energy prior to measuring analyte concentration.
  • control signal 408 c is deactivated, which in turn is used by switch circuit 410 to deactivate light source 302 .
  • switch circuit 410 shunts current from light source 302 using convention power devices to deactivate light source 302 .
  • signal 408 d is also generated and provided to data analysis system 316 (shown in phantom and described above with respect to FIGS. 3A and 3B). Although signal 408 c and 408 d are shown as separate signals, it may be preferable to combine them into a single control signal if desired. In such an approach conditioning of signal 408 c may be required to provide a convenient control signal logic level (based on digital signals, for example) to provide proper control of data analysis system 316 .
  • Signal 408 d (in the two-signal 408 c / 408 d approach) is used by data analysis system 316 to indicate that light source 302 has been deactivated and that the measurement of the analyte should begin. At this point, the process repeats itself to measure successive ring downs by once again initializing first delay circuit 412 through control circuit 408 .
  • an initialization signal 420 is provided as an input to first delay circuit 412 .
  • initialization signal 420 Upon activation of initialization signal 420 , such as through a button, or control signal from data analysis system 316 , for example, delay time to begins. The process then follows the procedure outlined above.
  • switch circuit 410 provides three functions: 1) as a laser current driver providing laser driving current for a desired output of laser power, 2) providing current modulation resulting in energy build-up within cavity 318 , and 3) as a current switch/shunt for enabling/disabling current drive to light source 302 .
  • controller 314 energizes light source 302 to generate energy into resonant cavity 318 , employs a first delay to allow light source 302 to stabilize before looking for new data, utilizes a second delay to wait for a build up of sufficient light energy in the cell, then turns off the energy to light source 302 . Another delay is employed after energy is removed from light source 302 to allow the light energy to completely ring down. This process is then repeated for a single wavelength ring-down data at a given temperature. Ring-down spectra are processed by the data analysis system 316 . These various delays are illustrated in FIG. 5.
  • light source 302 is energized by providing operating current I, which is above the light source's threshold current I 0 .
  • Threshold current I 0 varies based on the type of light source used.
  • Delay time t 2 represents the delay to allow the light source to stabilize. In one exemplary embodiment, time delay t 2 is set to about 100 msec.
  • Delay time t 3 represents the time to allow the current modulation to build up within resonant cavity 318 . It should be noted that the time required for the current modulation to build up within resonant cavity 318 is ⁇ t3.
  • time delay t 3 is based on the modulation frequency f of light source 302 , and is preferably equal to about 1/f.
  • Time delay t 1 is based on the ring down time of resonant cavity 318 . In order to allow sufficient time for light energy to “ring down” in resonant cavity 318 , time delay t 1 is preferably set to about ten (10) times the ring down time of the cavity.
  • Laser temperature driver 416 under control of convention means (not shown), provides temperature control for light source 302 for the generation of a desired light frequency at a given temperature.
  • the frequency is selected based on the particular analyte of interest.

Landscapes

  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • General Physics & Mathematics (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Spectrometry And Color Measurement (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
US10/145,209 2002-05-13 2002-05-13 System and method for controlling a light source for cavity ring-down spectroscopy Abandoned US20030210398A1 (en)

Priority Applications (11)

Application Number Priority Date Filing Date Title
US10/145,209 US20030210398A1 (en) 2002-05-13 2002-05-13 System and method for controlling a light source for cavity ring-down spectroscopy
PCT/US2003/000206 WO2003098173A1 (en) 2002-05-13 2003-01-02 System and method for controlling a ligth source for cavity ring-down spectroscopy
DE60304027T DE60304027T2 (de) 2002-05-13 2003-01-02 System und verfahren zur steuerung einer lichtquelle für cavity-ringdown-spektroskopie
AU2003202884A AU2003202884A1 (en) 2002-05-13 2003-01-02 System and method for controlling a ligth source for cavity ring-down spectroscopy
AT03701996T ATE320591T1 (de) 2002-05-13 2003-01-02 System und verfahren zur steuerung einer lichtquelle für cavity-ringdown-spektroskopie
ES03701996T ES2259756T3 (es) 2002-05-13 2003-01-02 Sistema y metodo para controlar una fuente luminosa para espectroscopia de ring-down de cavidad.
JP2004505651A JP4693409B2 (ja) 2002-05-13 2003-01-02 キャビティリングダウン分光法用の光源を制御するためのシステム及び方法
EP03701996A EP1497627B1 (en) 2002-05-13 2003-01-02 System and method for controlling a light source for cavity ring-down spectroscopy
CN038110229A CN1653319B (zh) 2002-05-13 2003-01-02 在腔环降光谱法中用于控制光源的系统和方法
TW092102730A TW584717B (en) 2002-05-13 2003-02-11 System and method for controlling a light source for cavity ring-down spectroscopy
US11/252,128 US7277177B2 (en) 2002-05-13 2005-10-17 System and method for controlling a light source for cavity ring-down spectroscopy

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US10/145,209 US20030210398A1 (en) 2002-05-13 2002-05-13 System and method for controlling a light source for cavity ring-down spectroscopy

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US11/252,128 Continuation-In-Part US7277177B2 (en) 2002-05-13 2005-10-17 System and method for controlling a light source for cavity ring-down spectroscopy

Publications (1)

Publication Number Publication Date
US20030210398A1 true US20030210398A1 (en) 2003-11-13

Family

ID=29400423

Family Applications (2)

Application Number Title Priority Date Filing Date
US10/145,209 Abandoned US20030210398A1 (en) 2002-05-13 2002-05-13 System and method for controlling a light source for cavity ring-down spectroscopy
US11/252,128 Expired - Lifetime US7277177B2 (en) 2002-05-13 2005-10-17 System and method for controlling a light source for cavity ring-down spectroscopy

Family Applications After (1)

Application Number Title Priority Date Filing Date
US11/252,128 Expired - Lifetime US7277177B2 (en) 2002-05-13 2005-10-17 System and method for controlling a light source for cavity ring-down spectroscopy

Country Status (10)

Country Link
US (2) US20030210398A1 (zh)
EP (1) EP1497627B1 (zh)
JP (1) JP4693409B2 (zh)
CN (1) CN1653319B (zh)
AT (1) ATE320591T1 (zh)
AU (1) AU2003202884A1 (zh)
DE (1) DE60304027T2 (zh)
ES (1) ES2259756T3 (zh)
TW (1) TW584717B (zh)
WO (1) WO2003098173A1 (zh)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050103988A1 (en) * 2003-10-08 2005-05-19 Chuji Wang Fiber ringdown pressure/force sensors
US20050122523A1 (en) * 2003-12-03 2005-06-09 Wen-Bin Yan Device and method of trace gas analysis using cavity ring-down spectroscopy
US20050134836A1 (en) * 2003-12-17 2005-06-23 Barbara Paldus Cavity enhanced optical detector
CN100334440C (zh) * 2004-12-01 2007-08-29 中国科学院上海技术物理研究所 一种用于光学材料微弱吸收测量的设备及方法
US20080111993A1 (en) * 2006-11-10 2008-05-15 Miller J Houston Compact near-ir and mid-ir cavity ring down spectroscopy device
US20080111077A1 (en) * 2006-11-10 2008-05-15 Miller J Houston Compact near-ir and mid-ir cavity ring down spectroscopy device
US20080151248A1 (en) * 2006-12-22 2008-06-26 Honeywell International Inc. Spectroscopy Method and Apparatus for Detecting Low Concentration Gases
US7864326B2 (en) 2008-10-30 2011-01-04 Honeywell International Inc. Compact gas sensor using high reflectance terahertz mirror and related system and method
US8198590B2 (en) 2008-10-30 2012-06-12 Honeywell International Inc. High reflectance terahertz mirror and related method
CN113702302A (zh) * 2021-08-28 2021-11-26 武汉东泓华芯科技有限公司 一种基于光腔衰荡光谱技术的气体检测装置及方法

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2864622B1 (fr) * 2003-12-26 2006-09-22 Commissariat Energie Atomique Procede et dispositif de mesure d'absorption ou de diffusion lumineuse d'elements biologiques
JP4779522B2 (ja) * 2005-09-13 2011-09-28 澁谷工業株式会社 成分検査方法およびその装置
WO2007087081A2 (en) 2005-11-04 2007-08-02 Zolo Technologies, Inc. Method and apparatus for spectroscopic measurements in the combustion zone of a gas turbine engine
JP4947988B2 (ja) * 2006-02-08 2012-06-06 学校法人東海大学 ガス検出装置
US7532232B2 (en) * 2006-04-20 2009-05-12 Cisco Technology, Inc. System and method for single action initiation of a video conference
US20070250567A1 (en) * 2006-04-20 2007-10-25 Graham Philip R System and method for controlling a telepresence system
WO2008026183A1 (en) * 2006-08-31 2008-03-06 Koninklijke Philips Electronics N.V. Cavity-enhanced photo acoustic trace gas detector with improved feedback loop
US20090249861A1 (en) * 2006-08-31 2009-10-08 Koninklijke Philips Electronics N.V. Stable photo acoustic trace gas detector with optical power enhancement cavity
WO2009052157A1 (en) * 2007-10-16 2009-04-23 Zolo Technologies, Inc. Translational laser absorption spectroscopy apparatus and method
KR100903133B1 (ko) * 2007-12-17 2009-06-16 한국전자통신연구원 광공동을 이용한 고감도 혼탁도 센서 및 센싱 방법
US8098377B2 (en) * 2008-05-02 2012-01-17 James Lowell Gundersen Electric gated integrator detection method and device thereof
EP2432377A1 (en) * 2009-05-22 2012-03-28 Abbott Diabetes Care, Inc. Usability features for integrated insulin delivery system
RU2530686C2 (ru) 2009-08-10 2014-10-10 Золо Текнолоджиз, Инк. Уменьшение шума оптического сигнала с использованием многомодового передающего волокна
JP2011119541A (ja) * 2009-12-04 2011-06-16 Tokai Univ 光ファイバー結合外部共振器型半導体レーザーを用いたガス検出センサー
US9086421B1 (en) 2010-07-29 2015-07-21 Entanglement Technologies, Inc. Device and method for cavity detected high-speed diffusion chromatography
CA2871072C (en) 2012-04-19 2020-07-14 Zolo Technologies, Inc. In-furnace retro-reflectors with steerable tunable diode laser absorption spectrometer
CN111141707A (zh) * 2019-12-25 2020-05-12 电子科技大学 一种高反射光学元件反射率分布高分辨成像测量的方法
US11802858B2 (en) 2021-02-18 2023-10-31 Aerodyne Research, Inc. Rapid, sensitive hydrogen detector

Citations (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3402364A (en) * 1963-04-22 1968-09-17 Philips Corp Optical maser with roof system reflector under 90deg.
US3711788A (en) * 1964-02-24 1973-01-16 Philco Ford Corp Laser apparatus
US3982203A (en) * 1973-12-28 1976-09-21 Texas Instruments Incorporated Method of preventing post pulsing of Q-switched laser
US4161436A (en) * 1967-03-06 1979-07-17 Gordon Gould Method of energizing a material
US4525034A (en) * 1982-12-07 1985-06-25 Simmons Clarke V Polarizing retroreflecting prism
US4677639A (en) * 1977-12-12 1987-06-30 Laser Photonics, Inc. Laser device
US4740986A (en) * 1985-12-20 1988-04-26 Hughes Aircraft Company Laser resonator
US4746201A (en) * 1967-03-06 1988-05-24 Gordon Gould Polarizing apparatus employing an optical element inclined at brewster's angle
US5276548A (en) * 1992-12-01 1994-01-04 Eli Margalith Ring cavity optical parametric apparatus
US5463493A (en) * 1993-01-19 1995-10-31 Mvm Electronics Acousto-optic polychromatic light modulator
US5483342A (en) * 1993-06-25 1996-01-09 Hughes Aircraft Company Polarization rotator with frequency shifting phase conjugate mirror and simplified interferometric output coupler
US5528040A (en) * 1994-11-07 1996-06-18 Trustees Of Princeton University Ring-down cavity spectroscopy cell using continuous wave excitation for trace species detection
US5835231A (en) * 1997-10-31 1998-11-10 The United States Of America As Represented By The Secretary Of Commerce Broad band intra-cavity total reflection chemical sensor
US5912740A (en) * 1997-06-20 1999-06-15 The Board Of Trustees Of The Leland Stanford Junior University Ring resonant cavities for spectroscopy
US6233052B1 (en) * 1999-03-19 2001-05-15 The Board Of Trustees Of The Leland Stanford Junior University Analog detection for cavity lifetime spectroscopy
US6466322B1 (en) * 1998-12-31 2002-10-15 The Board Of Trustees Of The Leland Stanford Junior University Swept continuous wave cavity ring-down spectroscopy

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6313386A (ja) 1986-07-04 1988-01-20 Hamamatsu Photonics Kk 短パルスレ−ザ光発生装置
US6075252A (en) * 1998-11-16 2000-06-13 Innovative Lasers Corporation Contaminant identification and concentration determination by monitoring the temporal characteristics of an intracavity laser
EP1195582A1 (en) * 2000-10-09 2002-04-10 Eidgenössische Technische Hochschule Zürich Fiber optic sensor with an optical resonator

Patent Citations (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3402364A (en) * 1963-04-22 1968-09-17 Philips Corp Optical maser with roof system reflector under 90deg.
US3711788A (en) * 1964-02-24 1973-01-16 Philco Ford Corp Laser apparatus
US4746201A (en) * 1967-03-06 1988-05-24 Gordon Gould Polarizing apparatus employing an optical element inclined at brewster's angle
US4161436A (en) * 1967-03-06 1979-07-17 Gordon Gould Method of energizing a material
US4161436B1 (zh) * 1967-03-06 1988-04-26
US3982203A (en) * 1973-12-28 1976-09-21 Texas Instruments Incorporated Method of preventing post pulsing of Q-switched laser
US4677639A (en) * 1977-12-12 1987-06-30 Laser Photonics, Inc. Laser device
US4525034A (en) * 1982-12-07 1985-06-25 Simmons Clarke V Polarizing retroreflecting prism
US4740986A (en) * 1985-12-20 1988-04-26 Hughes Aircraft Company Laser resonator
US5276548A (en) * 1992-12-01 1994-01-04 Eli Margalith Ring cavity optical parametric apparatus
US5463493A (en) * 1993-01-19 1995-10-31 Mvm Electronics Acousto-optic polychromatic light modulator
US5483342A (en) * 1993-06-25 1996-01-09 Hughes Aircraft Company Polarization rotator with frequency shifting phase conjugate mirror and simplified interferometric output coupler
US5528040A (en) * 1994-11-07 1996-06-18 Trustees Of Princeton University Ring-down cavity spectroscopy cell using continuous wave excitation for trace species detection
US5912740A (en) * 1997-06-20 1999-06-15 The Board Of Trustees Of The Leland Stanford Junior University Ring resonant cavities for spectroscopy
US5835231A (en) * 1997-10-31 1998-11-10 The United States Of America As Represented By The Secretary Of Commerce Broad band intra-cavity total reflection chemical sensor
US6466322B1 (en) * 1998-12-31 2002-10-15 The Board Of Trustees Of The Leland Stanford Junior University Swept continuous wave cavity ring-down spectroscopy
US6233052B1 (en) * 1999-03-19 2001-05-15 The Board Of Trustees Of The Leland Stanford Junior University Analog detection for cavity lifetime spectroscopy

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7241986B2 (en) 2003-10-08 2007-07-10 Mississippi State University Fiber ringdown pressure/force sensors
US20050103988A1 (en) * 2003-10-08 2005-05-19 Chuji Wang Fiber ringdown pressure/force sensors
US20050122523A1 (en) * 2003-12-03 2005-06-09 Wen-Bin Yan Device and method of trace gas analysis using cavity ring-down spectroscopy
WO2005057189A1 (en) * 2003-12-03 2005-06-23 Tiger Optics, Llc Device and method of trace gas analysis using cavity ring-down spectroscopy
US20050134836A1 (en) * 2003-12-17 2005-06-23 Barbara Paldus Cavity enhanced optical detector
US7154595B2 (en) * 2003-12-17 2006-12-26 Picarro, Inc. Cavity enhanced optical detector
CN100334440C (zh) * 2004-12-01 2007-08-29 中国科学院上海技术物理研究所 一种用于光学材料微弱吸收测量的设备及方法
US20100012843A1 (en) * 2005-11-08 2010-01-21 The George Washington University Compact near-ir and mid-ir cavity ring down spectroscopy device
US8063373B2 (en) 2005-11-08 2011-11-22 The George Washington University Compact near-IR and mid-IR cavity ring down spectroscopy device
US20080111077A1 (en) * 2006-11-10 2008-05-15 Miller J Houston Compact near-ir and mid-ir cavity ring down spectroscopy device
US7541586B2 (en) 2006-11-10 2009-06-02 The George Washington University Compact near-IR and mid-IR cavity ring down spectroscopy device
US7569823B2 (en) 2006-11-10 2009-08-04 The George Washington University Compact near-IR and mid-IR cavity ring down spectroscopy device
US20080111993A1 (en) * 2006-11-10 2008-05-15 Miller J Houston Compact near-ir and mid-ir cavity ring down spectroscopy device
US7612885B2 (en) 2006-12-22 2009-11-03 Honeywell International Inc Spectroscopy method and apparatus for detecting low concentration gases
US20080151248A1 (en) * 2006-12-22 2008-06-26 Honeywell International Inc. Spectroscopy Method and Apparatus for Detecting Low Concentration Gases
US7864326B2 (en) 2008-10-30 2011-01-04 Honeywell International Inc. Compact gas sensor using high reflectance terahertz mirror and related system and method
US8198590B2 (en) 2008-10-30 2012-06-12 Honeywell International Inc. High reflectance terahertz mirror and related method
CN113702302A (zh) * 2021-08-28 2021-11-26 武汉东泓华芯科技有限公司 一种基于光腔衰荡光谱技术的气体检测装置及方法

Also Published As

Publication number Publication date
DE60304027D1 (de) 2006-05-11
US20060087655A1 (en) 2006-04-27
US7277177B2 (en) 2007-10-02
ATE320591T1 (de) 2006-04-15
AU2003202884A1 (en) 2003-12-02
CN1653319A (zh) 2005-08-10
WO2003098173A1 (en) 2003-11-27
JP4693409B2 (ja) 2011-06-01
EP1497627B1 (en) 2006-03-15
TW200306406A (en) 2003-11-16
CN1653319B (zh) 2012-04-04
EP1497627A1 (en) 2005-01-19
JP2005525571A (ja) 2005-08-25
ES2259756T3 (es) 2006-10-16
DE60304027T2 (de) 2006-09-28
TW584717B (en) 2004-04-21

Similar Documents

Publication Publication Date Title
US7277177B2 (en) System and method for controlling a light source for cavity ring-down spectroscopy
US5815277A (en) Deflecting light into resonant cavities for spectroscopy
US11378514B2 (en) Optical absorption spectroscopy based gas analyzer systems and methods
US5528040A (en) Ring-down cavity spectroscopy cell using continuous wave excitation for trace species detection
US9759654B2 (en) Cavity enhanced laser based isotopic gas analyzer
US6091504A (en) Method and apparatus for measuring gas concentration using a semiconductor laser
US7113286B2 (en) Apparatus and method for improved analysis of liquids by continuous wave-cavity ring down spectroscopy
US7902534B2 (en) Cavity ring down system having a common input/output port
AU628088B2 (en) Method for the detection of a gas using photoacoustic spectroscopy
US20050122523A1 (en) Device and method of trace gas analysis using cavity ring-down spectroscopy
JP2003518241A (ja) キャビティ内レーザの時間的特性測定による汚染種の同定及び濃度決定
US20050062972A1 (en) System and method for cavity ring-down spectroscopy using continuously varying continuous wave excitation
CN108398393B (zh) 一种快速测量温室气体含量的光腔衰荡光谱仪及测量方法
CN107076667B (zh) 激光束阻挡元件及包括该元件的光谱系统
KR20050020802A (ko) 공동 링-다운 분광법을 위한 광원을 제어하기 위한 시스템및 방법
RU206646U1 (ru) Газоанализатор растворенных в масле газов на основе диодно-лазерного абсорбционного спектрометра и недиспергирующего инфракрасного анализатора
SU979885A1 (ru) Устройство дл лазерно-спектроскопического абсорбционного анализа
NISHIMOTO et al. A compact, cylindrical multi-pass cell for sensitive detection of gas absorption
Wilhelmi Infrared gas monitoring with high-sensitivity, stability, and specificity

Legal Events

Date Code Title Description
AS Assignment

Owner name: TIGER OPTICS L.L.C., PENNSYLVANIA

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:AUGUSTINE, ROBERT;KRUSEN, CALVIN R.;WANG, CHUJI;AND OTHERS;REEL/FRAME:012915/0698;SIGNING DATES FROM 20020508 TO 20020513

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION